37302. Nha Trang Mvac Spec

BPS ♦ 37302 ♦ Revision 00 Date of Issue: 06.2009

Technical Specification

MECHANICAL VENTILATION & AIR CONDITIONING SERVICES

PROJECT:

BEST WESTERN NHA TRANG PLAZA HOTEL

NHA TRANG - VIETNAM

CLIENT:

HAVANA JOINT STOCK COMPANY HCM – VIETNAM

CONSULTANT:

BONWAY PROJECT SERVICESMechanical & Electrical Consulting Engineers

Thieân Sôn Building - 5 Nguyen Gia Thieu Suit 403 - District 3 - HCMC - VIET NAM

BEST WESTERN NHA TRANG PLAZA HOTEL NHA TRANG – VIETNAM TECHNICAL SPECIFICATION – MVAC SERVICES

TABLE OF CONTENTS

Page No.

BPS ♦ 37302 Revision 00

1. SCOPE OF WORK ....................................................................................................... 1 1.1 PROJECT DESCRIPTION.................................................................................. 1 1.2 SERVICES DESCRIPTION ................................................................................ 1 1.3 DEFINITION OF TERMS.................................................................................... 1 1.4 EXTENT OF WORK............................................................................................ 3 1.5 SCHEDULE OF DRAWINGS.............................................................................. 4

2. CO-ORDINATION AND WORK BY OTHER CONTRACTORS................................... 5 2.1 CO-ORDINATION............................................................................................... 5 2.2 WORK BY OTHER CONTRACTORS ................................................................ 5

3. SPECIFIC PROJECT REQUIREMENTS...................................................................... 8 3.1 DESIGN REQUIREMENTS ................................................................................ 8

4. GENERAL REQUIREMENTS..................................................................................... 10 4.1 SITE INSPECTION........................................................................................... 10 4.2 AUTHORITY REQUIREMENTS AND STANDARDS ....................................... 10 4.3 WARRANTIES.................................................................................................. 10 4.4 SPECIFICATION AND DRAWINGS................................................................. 10 4.5 DISCREPANCIES & OMISSIONS.................................................................... 10 4.6 SETTING OUT OPENINGS AND MAKING GOOD.......................................... 11 4.7 POSITIONING OF EQUIPMENT...................................................................... 11 4.8 CO-ORDINATION OF INSTALLATION ............................................................ 11 4.9 PERFORMANCE AND GUARANTEE.............................................................. 11 4.10 SHOP DRAWINGS........................................................................................... 12 4.11 AS-INSTALLED OR AS-BUILT DRAWINGS.................................................... 12 4.12 EQUIPMENT DEVIATIONS.............................................................................. 12 4.13 PACKAGED EQUIPMENT................................................................................ 12 4.14 SAMPLES AND PROTOTYPES....................................................................... 13 4.15 RADIO INTERFERENCE.................................................................................. 13 4.16 LABELLING ...................................................................................................... 13 4.17 WORKMANSHIP AND MATERIALS ................................................................ 14 4.18 SETTING OUT.................................................................................................. 14 4.19 PRECAUTIONS IN CARRYING OUT WORKS ................................................ 15 4.20 SCAFFOLDING AND LIFTING EQUIPMENT................................................... 15 4.21 SEALING OF PENETRATIONS ....................................................................... 15 4.22 FIXINGS AND PLUGS...................................................................................... 16 4.23 STORAGE AND PROTECTION ....................................................................... 16 4.24 SITE CLEANLINESS AND REMOVAL OF RUBBISH...................................... 16 4.25 NOISE AND VIBRATIONS ............................................................................... 17 4.26 PIPE SLEEVES ................................................................................................ 17 4.27 EXPANSION..................................................................................................... 17

5. EQUIPMENT............................................................................................................... 18 5.1 CENTRIFUGAL/ SCREW CHILLERS - WATER COOLED.............................. 18 5.2 COOLING TOWER........................................................................................... 23 5.3 CENTRIFUGAL PUMPS................................................................................... 25 5.4 PRIMARY AIR HANDLING UNITS (PAU) ........................................................ 26 5.5 FAN COIL UNITS.............................................................................................. 31 5.6 VARIABLE AIR VOLUME (VAV) BOXES ......................................................... 33 5.7 VARIABLE FREQUENCY DRIVES (VSD) ....................................................... 34 5.8 AIR FILTERS .................................................................................................... 38 5.9 AXIAL FLOW FANS.......................................................................................... 39 5.10 CENTRIFUGAL FANS...................................................................................... 42 5.11 IN-LINE CENTRIFUGAL FANS ........................................................................ 42 5.12 PROPELLER FANS - WALL OR CEILING MOUNTED.................................... 42 5.13 EXHAUST FANS - ROOF MOUNTED.............................................................. 43 5.14 CLOSED TYPE EXPANSION VESSEL............................................................ 43

6. DUCTWORK & FITTINGS.......................................................................................... 44


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6.1 GENERAL......................................................................................................... 44 6.2 SHEET METAL DUCT MATERIALS................................................................. 45 6.3 FLEXIBLE DUCTS............................................................................................ 45 6.4 FITTINGS.......................................................................................................... 46 6.5 DUCT SUPPORTS, HANGERS AND BRACING ............................................. 49 6.6 AIR OUTLETS .................................................................................................. 50 6.7 THERMAL AND ACOUSTIC INSULATION...................................................... 53 6.8 SEALING AND FLASHING............................................................................... 55 6.9 TEST POINTS .................................................................................................. 55 6.10 CLEANING AND PROTECTION DURING CONSTRUCTION ......................... 56 6.11 LEAK TESTING ................................................................................................ 56

7. PIPEWORK AND FITTINGS ...................................................................................... 57 7.1 GENERAL......................................................................................................... 57 7.2 OPERATING AND TEST PRESSURES........................................................... 58 7.3 PIPEWORK MATERIALS ................................................................................. 58 7.4 PIPE JOINTS, UNIONS AND FLANGES ......................................................... 59 7.5 PIPE FITTINGS ................................................................................................ 60 7.6 WELDING OF FERROUS PIPEWORK ............................................................ 61 7.7 WELD JOINTS ON UPVC PIPEWORK............................................................ 62 7.8 WELD JOINTS ON COPPER PIPEWORK....................................................... 62 7.9 PIPE SUPPORTS............................................................................................. 62 7.10 FLEXIBLE PIPE CONNECTIONS AND EXPANSION...................................... 66 7.11 THRUST BLOCKS............................................................................................ 66 7.12 GUIDES ............................................................................................................ 67 7.13 PIPELINE GRADIENTS.................................................................................... 67 7.14 AIR VENTS....................................................................................................... 68 7.15 DRAIN POINTS ................................................................................................ 68 7.16 VALVES............................................................................................................ 69 7.17 FLOW METERS AND GAUGES....................................................................... 72 7.18 UNIVERSAL PRESSURE/TEMPERATURES TAPPING POINTS................... 73 7.19 PIPE SLEEVES ................................................................................................ 73 7.20 WATER STRAINER (PIPELINE) ...................................................................... 74 7.21 WATER HAMMER ARRESTOR....................................................................... 74 7.22 PIPE CLEANING .............................................................................................. 74 7.23 PIPEWORK INSULATION................................................................................ 74 7.24 AIR RELEASE AND VACUUM BREAK VALVES FOR WATER PIPELINES .. 76

8. WATER TREATMENT................................................................................................ 78 8.1 GENERAL......................................................................................................... 78 8.2 CHILLED WATER & CONDENSER WATER SYSTEMS................................. 79

9. ELECTRICAL ............................................................................................................. 81 9.1 GENERAL......................................................................................................... 81 9.2 MECHANICAL SERVICES SWITCHBOARDS (MSSB) ................................... 81 9.3 ELECTRICAL CONTROL PANEL COMPONENTS ......................................... 83 9.4 ELECTRICAL INSTALLATION ......................................................................... 85

10. PAINTING, LABELLING AND FINISHING ................................................................ 87 10.1 MATERIALS...................................................................................................... 87 10.2 PLANT, MACHINERY & EQUIPMENT............................................................. 87 10.3 EXPOSED METALWORK ................................................................................ 87 10.4 CONCEALED METALWORK ........................................................................... 87 10.5 PLASTERED FINISH INSULATION ................................................................. 87 10.6 PIPEWORK AND METAL SHEATHING........................................................... 88 10.7 PIPEWORK IDENTIFICATION......................................................................... 88 10.8 DUCTWORK IDENTIFICATION ....................................................................... 88 10.9 COLOUR SCHEMES........................................................................................ 89 10.10 LABELLING ...................................................................................................... 89


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10.11 APPLICATION OF PAINTING .......................................................................... 90 11. TESTING, BALANCING & COMMISSIONING .......................................................... 91

11.1 GENERAL......................................................................................................... 91 11.2 SUPERVISION BY ENGINEER FROM THE MANUFACTURER..................... 91 11.3 ACCEPTANCE PROCEDURE ......................................................................... 91 11.4 EQUIPMENT FOR TESTING AND COMMISSIONING.................................... 92 11.5 TESTING DURING ERECTION........................................................................ 93 11.6 PRELIMINARY COMMISSIONING AND PRETREATMENT ........................... 94 11.7 FACTORY TESTS ............................................................................................ 95 11.8 ON-SITE TESTING AND COMMISSIONING ................................................... 96 11.9 LOCAL AUTHORITIES’ TESTS & INSPECTIONS......................................... 106 11.10 TRAINING OF PLANT OPERATORS............................................................. 106

12. SERVICE AND MAINTENANCE.............................................................................. 107 12.1 SCOPE ........................................................................................................... 107 12.2 SERVICE ........................................................................................................ 107 12.3 SERVICE REPORTS...................................................................................... 107

13. OPERATING AND MAINTENANCE MANUALS ..................................................... 108 13.1 GENERAL....................................................................................................... 108 13.2 MANUAL CONTENTS .................................................................................... 108 13.3 AS INSTALLED DRAWINGS.......................................................................... 109

APPENDIX A – REFERENCE DRAWINGS

APPENDIX B – SCHEDULE OF TECHNICAL DATA

APPENDIX C – VIETNAMESE TRANSLATION FOR REFERENCES

BEST WESTERN NHA TRANG PLAZA HOTEL NHA TRANG - VIETNAM Page 1

TECHNICAL SPECIFICATION – MVAC SERVICES


1. SCOPE OF WORK

1.1 PROJECT DESCRIPTION

The purpose of this design brief is to outline all the Mechanical and Electrical system that will be installed in the Best Western Premier Nha Trang project located at 38 Tran Phu, Nha Trang, Khanh Hoa.

The project will generally comprises:

Level Space Usage GFA

Basement Carpark & M&E Plantrooms 2,895 m2

Level 1 Commercial, Lobbies & Carpark 2,846 m2

Level 2 Restaurant, Kitchen, Carpark 2,547 m2

Level 3 Restaurant, Dining Room, Conference 2,875 m2


Level 5 Sport Hall, Dining Room, Swimming Pool 2,875 m2

Level 6 Entertainments, Plantrooms 2,230 m2

Level 7 ~ 10 Hotel, Offices 4 x 2,350 m2

Level 11 ~ 19 Hotel, Villa and Garden 8 x 2,350 m2

Level 20, 21 Hotel, Technical Area 2 x 2,350 m2

Level 22 ~ 38 Hotel 16 x 1,800 m2

Level 39 Restaurant 1,800 m2

TOTAL GROSS FLOOR CONSTRUCTION AREA: ≈ 82,418 m2

The building height from ground floor to roof level for this block is approximately 128m.

1.2 SERVICES DESCRIPTION

The services cover under this specification is for the supply, installation, testing & commissioning and maintenance during defect liability period of Mechanical Ventilation and Air Conditioning Systems.

The Mechanical Ventilation shall be installed at all Plant rooms, Basement, Kitchen and the Toilets. The Air Conditioning System with Central Cooling Chiller Plant, VRV system, PAU, FCU and VAV/ CAV boxes shall be installed at all designed areas.

1.3 DEFINITION OF TERMS

The following definitions apply to the terminology used in this specification and associated drawings.

Owner/Principal: HAVANA J.S. CO. Architect Consultant: HTT

M&E Engineers: BONWAY PROJECTS SERVICES

Sub Contractor: The MVAC Contractor appointed to carry out the work covered in the services specifications and drawings.




Main Contractor: The Contractor appointed to carry out main construction work of the project

Approval/Approved: Subject to the approval of the Owner/Principal or Project Management Consultant




1.4 EXTENT OF WORK

This specification, unless specifically stated otherwise, calls for the provision of systems complete in every respect, fit and ready for continuous, safe, efficient operation. The sub contractor shall therefore supply, deliver, install, test, commission and set to work the systems and they shall be complete with all necessary ancillary and minor items, whether expressly indicated on the drawings or specification or not.

It shall be this Contractor’s responsibility to calculate the resistance head for all fans and pumps and by this calculation guarantee the delivery of the specified conditioned air and water quantities at the locations shown on the drawings and specified herein.

The works by this Contract shall comprise the following: (a) Provision of a central cooling plant comprising water-cooled Chiller, pump,

cooling tower, insulated pipework and the like to serve all hotel floors and lobby on Ground Floor

(b) Complete air distribution/ventilation systems consisting primary air handling unit (PAU), fan coil units (FCU) including the thermostats, ventilation fans, filters, ducting and the like

(c) All air registers/diffusers and air distribution system accessories including manual volume control dampers, splitter damper, air outlets, access panels, etc. associated with the MVAC systems

(d) Complete mechanical ventilation system for toilets and plant rooms as shown on the drawings

(e) A condensate drain pipe system with fittings (f) All thermal insulation associated with the MVAC installation (g) All noise and vibration control works associated with the MVAC installation

The sub contractor shall include for all noise and vibration measures and acoustic treatment specified elsewhere in this specification to achieve the noise levels as specified. Detail calculation and shop drawings shall be submitted for approval. The acoustic treatment which has been specified herein is the minimum requirements and shall be provided in all cases

(h) All electrical works associated with the MVAC installation (from Floor Distribution MSSB or Local MSSB to equipment. Cabling from MSB to MSSB will be provided by Electrical Sub Contractor. Refer MVAC drawings for exact limitation).

(i) Provision of Building Management System (BMS) with all cabling including cabling from the control modules to equipments (if this package is separate, the BMS sub-contractor shall provide & connect cables to all BMS interfaces of equipment as defined.

(j) Provision of BMS interface for all MVAC equipments as defined in BMS drawings (k) Provision of manual override switch at Fire Services control room to switch off all

fans of the MVAC system serving the building in the event of a fire alarm (l) Supply and installation of control cables (fire rated type) from module controllers

of Fire Alarm system to all MVAC equipments such as Smoke Extract Fan, Pressurization Fan, motorized damper…

(m) All painting of ductwork, pipework and equipment and the like (n) Interface work with Main Contractor/Other Contractors as detailed in the following

clause for ‘Interface Work’ (o) Liaison with, and submission to, all Local Authorities to obtain all necessary

certificates and approvals including the completion of all forms, preparation of all shop drawings and other document for necessary submission purpose and the payment of any fees




The submission shall include but not be limited to the following:

(i) Local Police Fire Services Department (FSD) for Stair Pressurisation Fans and Ventilation / Air-Conditioning Control System

(ii) Work Completion certificate in accordance with the Local Power Company for Electrical installation associated with MVAC Installation if required

(iii) Provision of spare parts as scheduled

(p) Training of Owner/Principal’s staff for proper operation of the entire installed system

(q) Liaise, assist, co-ordinate and provide technical supports/supervision to the VRV Specialist for the testing and commissioning of the VRV Plant.

(r) Selection, installation and commissioning of plant and equipment, including appropriate isolation and acoustic treatment, to achieve the design noise levels specified elsewhere in this specification.

(s) All associated building work unless specifically nominated elsewhere in this specification. The work shall include the following:

(i) Making good, Painting

(ii) Fire stopping

(t) Testing, commissioning, maintenance and defects liability for the MVAC work This shall include:

(i) Defects liability for 52 weeks from date of Practical Completion

(ii) Provision of Operational Maintenance and Breakdown Services including all labour, tools, materials, spare parts and consumerables during the defects liability period

(u) Provision of four (04) sets of Operating and Maintenance Manuals, including ‘as-installed’ or ‘as-built’ drawings and all testing and commissioning data

1.5 SCHEDULE OF DRAWINGS

Refer to Appendix A for the tender drawings which shall be read in conjunction with this specification.




2. CO-ORDINATION AND WORK BY OTHER CONTRACTORS

2.1 CO-ORDINATION

The sub contractor shall co-ordinate and furnishes all necessary information as required to the Main Contractor and his nominated Contractors/Sub-Contractors so that works can be carried out without undue delay to the construction programme.

Any additional work occasioned by lack of co-operation between the sub contractor and the Main Contractor or any other Contractors will not be considered as a variation to the Contract or as grounds for extension of time.

The Main Contractor will be responsible for checking all penetration drawings and for negotiating with the various Contractors for amendment of penetration requirements as necessary.

2.2 WORK BY OTHER CONTRACTORS

(a) Building Works by Main Contractor

The following building works shall be provided by the Main Contractor:

(i) All concrete equipment plinths and concrete piers in plant rooms keyed to the floor slab and graded where required. Plinths and concrete supports shall have shapes and dimensions and contain the information for operating weight and the load distribution for various pieces of equipment as indicated on detailed shop drawings to be provided by the sub contractor

(ii) All concrete inertia bases including steel frameworks and reinforcements for all the pumps as indicated on detailed shop drawings to be provided by the sub contractor

(iii) All architectural louvers mounted on external structural walls, ground floor and above (sizes and location shall be provided by Contractor who shall also check and confirm whether louvers shown on Architectural drawings are suitable or not)

(iv) All building penetrations through slab, beams and structural walls and the building in of all pipe sleeves, puddle flanges and equipment holding down bolts, where required to be built in during construction. The sub contractor shall supply all bolts, sleeves, and puddle flanges and detailed drawings accurately positioning such items

(v) The sub contractor shall seal up the annular space between sleeves and pipes/ducts with approved materials to achieve fire resistant, waterproof, air tight and/or acoustic barrier as appropriate. The Main Contractor shall seal up openings between sleeves and structure or building elements

(vi) All access hatches, doors and panels as nominated by the sub contractor and in accordance with his details as required in false ceilings, masonry risers, plant rooms and at other places as required to allow access for adjustment, maintenance and cleaning

(vii) All cutting, patching, framing up, furring in, chasing and making good associated with the building construction for the passage of ductwork, pipes, conduits and grilles, and the like. Detailed shop drawings shall be provided by the sub contractor

(viii) All under-flashing of all roof penetrations for cables, pipes and ductwork (over-flashing shall be by the sub contractor)




(ix) Site facilities including temporary water and Lighting supply for lighting, operation of power tools and testing, commissioning and maintenance up to and including final acceptance of the MVAC Installation by the Principal/Consultants. The sub contractor shall be deemed to have noted these provisions and to have made due allowance for any additional requirements not described therein

(x) Floor drains and/or drain connections in plant rooms, manholes and equipment areas as shown on the detailed shop drawings

(xi) The sub contractor shall supply and install condensate water pipes connections from MVAC equipment, overflow, and equipment drain to these drain connection points even where details are not shown on tender drawings

(xii) The sub contractor shall submit to the Main Contractor all necessary information, schedules and fully dimensioned shop drawings showing details of building work required in connection with the Contract work. Such submissions shall be made in sufficient time for the Main Contractor to obtain the Consultant’s approval and to enable the Main Contractor to incorporate all holes, chases and the like to be left in the structural building work as it proceeds so as not to be cut out subsequently

(xiii) The sub contractor shall provide all structurally embedded materials such as pipe sleeves, anchor bolts and the like to the Main Contractor sufficiently well in advance of the progress of the works to enable such items to be cast-in by the Main Contractor

(xiv) The sub contractor shall provide adequate supervision and setting out on Site to ensure that all the builder’s work is carried out in accordance with his requirements and as approved by the Architect. Any matters not in accordance with his requirements shall be drawn to the attention of the Main Contractor who will amend/ alter as necessary




(b) Electrical Works by Electrical Sub Contractor

The following provisions shall be provided by Electrical Sub Contractor to incorporate the MVAC installation:

(i) Provision of MSSB as indicated in drawings of Electrical Services

(ii) Provision of power supply cables from MSB to MSSB. The Electrical Sub Contractor shall terminate the power supply cables onto the MSSB. (The outgoing cables shall be done by the this sub contractor)

(iii) Provision of power supply to the small ventilation fans in the form of switched fused connection units

(iv) Provision of power supply to FCU in the form of switched fused connection units

(v) Provision of a 30A 1∅ isolating switch (essential power supply) in the MSSB room for Chiller oil heater

(vi) Provision of a 13A fused spur unit (essential power supply) in PAU for DDC outstation

(vii) Provision of power supply to chemical dosing for chilled water pumps

(viii) General Power Outlets for all DDC

(ix) Plant room lighting and general power outlets

The Sub Contractor shall supply and install power and control wirings from the switches to all starter panels and motors of the MVAC equipment

Connection of wirings from dry contacts for remote indication of MVAC equipment shall be provided by the sub contractor

(c) Plumbing Works by Plumbing Sub Contractor

(i) Floor waste or tundish to cooling coils, pumps, roof openings and at lowest point in the plant room

(ii) Cold water supply terminating in an isolation valve adjacent to feed and expansion tanks

(iii) Acoustic treated drains from plant room down into occupied areas.

(d) Fire Protection Works by Fire Services Sub Contractor

(i) Provision of fire rated addressable loop

(ii) Provision of addressable interface modules adjacent to MSSB and connected to the addressable loop. Modules to incorporate input and output no volt relay contacts for control and monitoring of mechanical plant during fire mode. Supply and installation of fire signal cabling from the MSSB to the interface module shall be by the sub contractor. Final termination to the interface module shall be by the Fire Services Sub Contractor

(iii) Provision of manual control switches and status indication on the Fire Control Panel for all mechanical plant required to operate in fire mode.

(iv) Fire Services Sub Contractor and Contractor shall co-ordinate all interface requirements.




3. SPECIFIC PROJECT REQUIREMENTS

3.1 DESIGN REQUIREMENTS

The MVAC services have been designed to the following criteria:

(a) Air-conditioning:

(i) Location

● Location: Nha Trang - Vietnam ● Latitude: 11o42’ N - 12o52’ N ● Longitude: 108o40’ E - 109o27’ E ● Elevation: ..... m

(ii) Ambient Air Temperatures

● Summer Dry Bulb: 37oC ● Summer Wet Bulb: 29.0oC ● Summer Daily Range: 11.0oC ● Designed Month: April or May

(iii) Air Conditioned Space Temperatures & Humidity

● Office areas: 25oC ± 2oC & 60%RH ± 5%RH ● Conference room: 25oC ± 2oC & 60%RH ± 5%RH ● Reading room: 25oC ± 2oC & 60%RH ± 5%RH ● Lobby: 26oC ± 2oC & 60%RH ± 5%RH

(iv) Fresh Air Intake

● Office areas: 8.0 L/s per person ● Conference room: 4.5 L/s per person ● Reading room: 4.5 L/s per person ● Bedroom: 25 L/s/bedroom

(v) Population Density

● Office areas: 10.0 m2 per person ● Conference room: 2.0 m2 per person ● Reading room: 1.5 m2 per person ● Bedroom: 1-2 persons/bedroom

(vi) Lighting & Electric Appliances

● Office areas: Lighting: 25 W/m2, Power: 35 W/m2 ● Conference room: Lighting: 20 W/m2, Power: 10 W/m2 ● Reading room: Lighting: 20 W/m2, Power: 10 W/m2 ● Lobby : Lighting: 15 W/m2, Power: 10 W/m2 ● Hotel: Lighting: 20 W/m2, Power: 10 W/m2




(b) Ventilation

● Toilet Exhaust Air: The greater of 6AC/H or 25L/s/fixture or 10L/s/m2 of Toilet Floor Area

● Plant Room Supply / Exhaust Air:

AS 1668.2

(c) Noise Levels

Noise from MVAC services equipment should be free of tonal and spectral content and should not exceed the following level when measured at a distance of 1.2m above floor level, and 1.5m from any duct, cupboard or plantroom wall. Continuous noise level criteria are expressed in terms of Noise Criteria (NC) and should be measured in the octave bands 63Hz to 8KHz.

● Office areas: NC 30 – 35

● Conference room: NC 30 – 35

● Reading room: NC 25 – 30

● Public Circulations: NC 35 – 40

● Hotel: NC 25 – 30

Where a range is given, the lower level be used as a design goal. The upper level indicates the maximum permissible level on site.




4. GENERAL REQUIREMENTS

4.1 SITE INSPECTION

Tenderers must inspect the site to familiarise themselves with the conditions thereupon prior to submission of tender. Confirmation of site inspection shall be submitted with tender.

4.2 AUTHORITY REQUIREMENTS AND STANDARDS

Uniform Mechanical Codes current at the date of tendering and also reference Codes and Standards listed in the prefaces to those Standards and Codes are applicable in respect of all materials and workmanship except where in conflict with the provisions of these specifications.

Where Uniform Mechanical Codes does not exist, the appropriate British Standard or Code shall apply. Where this specification expressly requires standards higher than or different from those applicable under the relevant Standard or Code documents, this Specification shall be followed.

Advise all subsequent amendments to applicable codes as they come into force during the work and seek a direction regarding compliance for this project.

All work shall comply with the:

● Local Building Regulations ● Local Power Supply Authority Regulations ● Local Environmental Protection Department Requirements ● Local Police Fire Services Department Requirements ● All relevant Australian/British Standards and Codes

4.3 WARRANTIES

Warranties specified in this specification are additional to any warranties required by current Industry Codes of Practice and relevant regulations

4.4 SPECIFICATION AND DRAWINGS

The drawings provided with this Specification as listed in Appendix A shall be read in conjunction with this Specification.

The Specification and drawings are mutually explanatory, and all work called for by one, even if not by the other, shall be fully executed and completed.

The drawings shall be considered approximate and diagrammatic only. Actual dimensions shall be obtained by the sub contractor.

It is the responsibility of the sub contractor to ascertain that all particular equipment offered fits into the provided spaces taking into consideration the requirements for maintenance and other factors affecting the installation.

4.5 DISCREPANCIES & OMISSIONS

If any discrepancy, contradiction or omission appears in the specification or drawings, the Tenderer shall refer same to the Owner/Project Manager and Consultant for resolution before submitting a Tender. The Consultant will issue directives on such matters in writing. Oral amendments to the specification shall not be recognised by the Tenderer.




4.6 SETTING OUT OPENINGS AND MAKING GOOD

The precise location of all openings, fixings and similar items of work required for these works to be provided by the Main Contractor shall be determined at such times as not to cause delay to the work. All items shall be checked to ensure correct positioning. If openings, fixings and similar items of work are wrongly located or are omitted due to incorrect or lack of information, the cost of any remedial works shall be paid for by the sub contractor.

The specification and drawings are diagrammatic only and unless otherwise stated shall not be used for determining the precise positions of equipment outlets and like features. The exact location of these shall be determined on site or from shop drawings.

All chases, ducts, recesses and penetrations in structural elements not shown on the building and structural drawings shall be subject to approval.

4.7 POSITIONING OF EQUIPMENT

The layout of equipment shown on the drawings is diagrammatic only, and exact positions shall be determined on site. Final position shall be to the approval of the Consultant. Ensure that all plant offered is suitable for installation in the location and spaces shown on the drawings and will be accessible for maintenance in accordance with the manufacturer’s recommendations when installed.

Equipment shall be symmetrically located in relation to other equipment and devices, the building module and general aesthetic treatment.

4.8 CO-ORDINATION OF INSTALLATION

Co-ordination shall be carried out to ensure that all items for installation in false ceilings are provided in sufficient time to comply with the Main Contractor’s program. All other services within false ceilings shall be completely installed so that it will not be necessary to remove any ceiling tiles to finish other work, apart from commissioning.

Responsibility and provision shall be allowed for any cost where due to delays or deficiencies attributable to this Contract, ceiling tiles must be removed and replaced, or additional penetrations provided in the ceiling.

4.9 PERFORMANCE AND GUARANTEE

The Tenderer will, by the fact of his tendering, be regarded as guaranteeing that:

● The equipment offered by him is of the most modern and correct design and construction and of the necessary capacity to efficiently perform the work specified.

● The equipment offered is capable of being installed in the plant space shown on the exhibited drawing with adequate clearance for its proper operation and maintenance.

● Noise levels due to plant installed under this Contract shall be not more than as specified elsewhere in this specification.

● The equipment offered will provide the minimum capacities as scheduled elsewhere in this Specification or on the drawings.

● The air distribution system shall be balanced to within ± 5% of the specified quantities.

● All the settings and limits of all control instruments and equipment shall be the responsibility of the sub contractor and he shall ensure that the specified requirements and conditions are met.

● The equipment installed by the sub contractor shall maintain the air temperature within the limits specified as inside design conditions at all times when the outside air temperature is at or within the outside design conditions.




4.10 SHOP DRAWINGS

The sub contractor shall prepare shop drawings (working drawings) of the proposed installation. All shop drawings shall be submitted to the Consultant for approval before commencing any work. All checking and approval of such drawings by the Consultant shall be construed as gratuitously assisting the sub contractor and does not relieve the sub contractor from responsibility for errors or omissions.

Where such errors or omissions are discovered later they shall be corrected by the sub contractor irrespective of any approval given by the Consultant. Approval of drawings shall not be construed as authorising additional work or increased cost to the Owner/Principal In the event that the drawings indicate additional work involving increased cost, the sub contractor shall notify the Principal/Consultant at the time of submission of the drawings.

4.11 AS-INSTALLED OR AS-BUILT DRAWINGS

As from the commencement of work the sub contractor shall employ a competent draughtsman to keep a record of all deviations and changes from the contract and shop drawings and shall mark on a set of prints an accurate record of all work as actually installed.

Refer also to the relevant section of this specification for more details.

4.12 EQUIPMENT DEVIATIONS

The dimensions and ratings of equipment specified herein or indicated on the drawings are intended to establish the outlines and characteristics of equipment furnished by the particular manufacturers specified. Where the sub contractor intends to use an item of equipment other than that specified or shown on the drawings he must apply in writing to the Principal/Consultant and await written approval before proceeding.

Where such approved deviation requires a different quantity and arrangement of architectural or structural materials, or a different quantity and arrangement of wiring, conduit and equipment from that specified or shown on the drawings, the sub contractor shall furnish and install any such additional structural supports, insulation, controllers, motors, starters, electrical wiring and conduit, and any other additional materials and equipment necessitated by the deviation.

Alternative equipment and materials shall comply with maximum sound power levels, minimum insertion loss and absorption at the stated flow/static pressure etc. Where sound power levels are exceeded, additional acoustic treatment shall be provided to comply with the noise and vibration criterion at no additional cost to the contract.

4.13 PACKAGED EQUIPMENT

Where packaged or unitary equipment is specified or offered against this Specification, such equipment shall be modified to conform to the requirements of this Specification, whether or not this requires modification of the Manufacturer’s standard construction. Any modification shall be to the approval of the manufacturer and the modified equipment shall carry the manufacturer’s full warranty.

The fact that the Tenderer may have offered a particular packaged item by name shall not absolve him from modifying it to meet the Specification.




4.14 SAMPLES AND PROTOTYPES

Samples of materials and items described as “to be approved” shall be delivered to site at least 15 days before approval is required. Two samples shall be supplied of each item required, each one to be properly identified and marked with the suppliers name and model number. One of the samples shall be held on site, the second shall be returned to the manufacturer once it has been viewed and comments have been received from the Consultant. On acceptance the samples will be marked with:

● Date approved ● By whom

Submit the following sample fittings and accessories to obtain approval of the Consultant before installation:

● Registers, Diffusers and Grilles ● Temperature sensors ● Dampers ● Insulation Materials ● Piping Materials and Pipe Fittings ● Conduit and Cables

It shall be the responsibility of the sub contractor to arrange for the Consultant to inspect the samples to obtain approval and acceptance in writing of the offered samples. The approved samples shall be retained on site for reference purposes until completion of the work. All such materials used in the work covered by this specification shall conform to the approved samples. The Consultant will be at liberty at any time to test or analyse samples of any materials brought onto the site and intended for these Works. In addition to the above requirements for the production, submission and approval of samples and prototypes, the Main Contractor may prepare an area in advance of the general construction cycle. The purpose of this area shall be to ensure co-ordination of all services and finishes and as a display area. Provide and install all samples and prototypes required for such an area as directed by the Main Contractor.

4.15 RADIO INTERFERENCE

All equipment and/or appliances provided under this specification shall be designed so that no interference will be caused with any radio or other electronic transmitting or receiving equipment in the same locality. In the event of the inherent characteristics of the electrical installation being such that interference is possible, efficient devices or screening techniques capable of eliminating such interference shall be provided at the sub contractor’s expense. Define the areas susceptible to interference prior to the purchase of equipment and appliances and advise the Consultant of the methods to be adopted to reduce the interference.

4.16 LABELLING

All PAU, FCU, pumps, fans, control valves, chilled water pipes, condensate water pipes, switches, fuses, relays, terminal strips, circuit breakers and compartments shall be comprehensively labelled to clearly indicate their function. Labels shall be of Sandwich Ivorine or Traffolyte material, white with black lettering for normal power and white with red lettering for standby power. Labels shall be permanently attached to a fixed element by fastener or adhesive. Self stick or adhesive tapes shall not be used. Submit all label schedules for approval prior to manufacture.




4.17 WORKMANSHIP AND MATERIALS

The sub contractor shall provide skilled and expert labour as necessary to carry out the work in the best possible manner. The quality of workmanship shall be of first grade and in accordance with the highest standards of the respective trades. Workmanship of poor quality or of an unacceptable standard will be rejected by the Consultant and must be replaced by the sub contractor at no extra cost to the Owner with workmanship of the required standard.

All materials, fittings, accessories and apparatus are to be of first grade design and manufacture and are to comply with the relevant Australian/British standard specification. All materials, fittings, accessories and apparatus shall be new and shall be of current model and design unless specified otherwise. The sub contractor must submit for the approval of the Consultant prior to commencing installation, a list of all accessories, fittings and apparatus which it is proposed to employ in the work, and only such items as have been approved may be installed. Failure to comply with this provision will result in the unconditional rejection of such items when inspected on site.

Where directed by the Consultants ‘approved’ samples shall be kept on site. Each item of equipment shall be a standard catalogue product of an established, reputable, approved manufacturer. All similar equipment shall be of the same manufacture, type, class and finish, unless otherwise specified.

Where manufacturer’s catalogue numbers or types are specified or shown on the drawings, they are generally intended to be used as a guide, and are not intended to take precedence over the basic duty and performance specified or shown. In all cases, verify the duty with the particular characteristics of the equipment offered for approval.

Where no alternative materials are noted in the specification or on the drawings and where the words ‘equal’, approved equal’, ‘as approved’ etc do not appear, the exact make specified must be furnished and installed. No alterations will be permitted in the lists of manufacturers and suppliers submitted by the sub contractor with his Tender or subsequently without the written approval of the Consultant.

Should the sub contractor install materials and/or equipment other than by the approved manufacturer or supplier, such items may be rejected on site. All such rejected items shall be removed from the site as soon as possible and be replaced by approved items at no cost to the Owner/Principal.

The replacement of any such items shall not constitute grounds for any variation or any extension of time.

The sub contractor shall take every care to avoid damage to fittings, surfaces and equipment in the premises and any damage caused by his staff and/or the works of his Contract shall be his responsibility and shall be made good at his expense.

4.18 SETTING OUT

The sub contractor shall set out all lines and levels for the works and shall refer the same to the Main Contractor for his approval and shall follow all directions of the Main Contractor for modifications of same made necessary for the co-ordination of the works.

The positioning of equipment as shown on the tender drawings shall be considered as approximate and diagrammatic only and these drawings shall not be used for final setting out.

The sub contractor shall thoroughly examine the Specification and tender drawings, check all figured dimensions immediately after the Contract is awarded, and obtain such measurements and information as may be required to carry out the work.




4.19 PRECAUTIONS IN CARRYING OUT WORKS

Where any current Australian/British Standards is appropriate to storage, transport and use of materials, plant, equipment, to work processes or to safety precautions the provision of such Standard shall be observed except if they conflict with any regulation or special requirements of proper local authority in which case the latter shall apply.

In the absence of any such statutory or special requirements or relevant Standards, the sub contractor shall ensure that suitable procedures are observed and all proper care is taken.

During the construction, leave all unfinished work in a safe condition and protect the works against damage or loss through any cause whatever.

4.20 SCAFFOLDING AND LIFTING EQUIPMENT

Unless specifically instructed otherwise, provide all necessary temporary lifting equipment, scaffolding, framing or other supports to enable installation and access to the work.

4.21 SEALING OF PENETRATIONS

(a) Airtight Seals

All penetrations of trays and/or ducts through the building fabric of chambers subject to suction or pressurisation shall be sealed.

(b) Waterproofing of Penetrations

Floor penetrations for duct, pipe and cable risers shall be made weatherproof progressively during the construction of the works to minimise weather damage or effects of internal flooding within the building.

(c) Holes in Roof

Continuous welded weather collars for over-flashing shall be supplied and installed for all external ducts and pipes forming part of the work and sealed with an approved sealant.

(d) Acoustic Sealing

Wherever services penetrate walls, floors or ceilings, acoustic sealant shall be supplied and installed to maintain a degree of acoustic separation at least equal to the materials penetrated.

(e) Fire Barrier Penetrations

Where services penetrate fire walls, ceilings, floors or other fire rated barrier, sealant for those penetrations shall be sealed to the approval of the Authorities. The Authorities shall include:

● Local Building Authority ● Local Police Fire Services Department ● Local Power Supply Authority

The preferred method of sealing penetrations around ducts, pipes, cables and cable trays shall be by the use of fire retardant pillows packed tightly both sides of the penetrations. Internal fire barriers using intumescent fire retardant materials shall be used within all ductwork passing through the fire rated walls or floors.




4.22 FIXINGS AND PLUGS

Holes shall be drilled by electric or compressed air drill wherever possible. Explosive charge fixing devices shall not be used.

Where devices are required for attaching materials or equipment to the building, approved metal expansion devices shall be used when and where approved by the Consultant. Wooden plugs will not be permitted. Approval of the Consultant shall also be obtained prior to drilling to ensure that any post tensioning cables in the slab are not damaged. The Main Contractor will mark the location of all such cables.

Cadmium plated expanding metallic type masonry anchors shall be used for fixings in concrete, clay or concrete brickwork.

Bolts or machine screws with nuts, washers and anti-vibration devices shall be used where necessary for fixings into metal.

Plugs may be used for screw fixing to masonry construction including plastered expanded metal. Such plugs shall be used only for minor shear loadings. Holes and inserts and PVC screw anchor plugs shall be correctly sized.

Cadmium plated bolts, screws and washers shall be used in all instances.

4.23 STORAGE AND PROTECTION

The sub contractor shall be responsible for proper storage and protection of apparatus, materials and equipment on any site adjacent to, associated with or the subject of the works.

Upon delivery to site all materials and equipment shall immediately be secured properly stacked and protected from the weather dampness and dust with particular attention to preventing ingress to working parts and pipes. The sub contractor shall be responsible for storing all equipment which cannot be accommodated on site.

The sub contractor shall confer with the Main Contractor and accept his instructions with regard to storage of materials, particularly heavy loads. All equipment and materials shall be stored clear of floor slabs on timber packers.

Special care shall be exercised to prevent the ingress of dirt, moisture and foreign substances into conduit pipes, duct and equipment. Should such ingress occur carefully remove the offending matter and thoroughly clean the conduit pipes, ducts and equipment for approve

When any room in the building is used as a shop or storeroom in connection with these works all resulting making good and repairs, patching or cleaning of the room arising from such use shall be carried out prior to completion of the works.

Mixing of any materials on the floors other than where such material is finally to be located shall not be permitted.

Fittings or other equipment shall not be used as a place for depositing tools and materials, as a means of supporting scaffolding or for use as a work bench.

4.24 SITE CLEANLINESS AND REMOVAL OF RUBBISH

The sub contractor shall remove from site all rubbish, debris, material cuttings and other redundant materials which result from the works of this Contract, progressively and whenever directed by the Main Contractor

On completion of the work, promptly remove all materials and equipment from site, except such materials and equipment which the Owner has agreed to store for use during the Maintenance Period or as are required for testing




4.25 NOISE AND VIBRATIONS

Attention shall be paid to the prevention of noise and vibration in all equipment and the sub contractor shall be responsible for the correction of such objectionable noise and vibration as may occur to the satisfaction of the Consultant.

Maximum noise levels in air-conditioned spaces shall not exceed the levels specified in AS2107, CIBSE and/or elsewhere in this specification.

The sub contractor shall arrange for noise level testing at his cost where directed by the Consultant to prove that required levels have been achieved.

Plant sound power levels, duct absorption coefficients, attenuator and flexible duct insertion loss and other plant or materials acoustic performance where specified shall be submitted for approval by the Consultant prior to ordering. Samples may be required.

The main precautions to be taken to prevent generation and transmission of undue noise and vibration are as follows:

● All rotating machinery shall be properly balanced and shall be designed with clearances and mechanisms suitable for the noise level requirements, for the particular item of plant or equipment, specified elsewhere in this specification.

● Rotating machinery, unless otherwise specified, shall be mounted on springs, rubber in shear or other approved vibration isolating mountings or shall be resilient bearings. The mountings shall be protected from drips and damage. Where necessary, additional mass shall be fixed to the machinery. The loading of the mounting shall be adequate to ensure correct operation. Materials used to seal the spaces containing the isolating materials shall be flexible so that vibration is not transmitted and so that the seal is not damaged.

● Fan tip speeds and velocities and motor and compressor speeds shall be kept within the limits specified elsewhere in this specification.

● All connections to rotating machinery shall be flexible. ● Duct connections shall be isolated by flexible connections. ● Pipe connections shall be suitably flexible for the duty involved. Approved

flexible connections shall be provided where insufficient flexibility can be obtained in the piping itself or when vibration could be transmitted to the building structure. Flexible connectors shall be so positioned that no stresses can be put on the pipes due to end-reaction. Flexible connections in refrigerant lines will only be permitted when the pipework cannot be arranged to provide adequate flexibility.

● Electric motors shall be super silent types where noise from them could disturb occupied areas or raise the noise levels above those specified. Contactors shall be free of undue hum and vibration.

● Internally insulated ducts shall be provided where and as specified. Duct interiors shall be as smooth streamlined as possible - screw ends, raw edges of metal, drumming panels, will not be permitted in the air stream.

● Air outlets and inlets shall be selected to permit the noise levels specified to be achieved.

4.26 PIPE SLEEVES

Provide pipe sleeves where necessary for installation of pipes through the building structures.

4.27 EXPANSION

Provision shall be made throughout for expansion and contraction wherever necessary to ensure stress due to expansion is relieved and is not transmitted to fixing devices or building structure. This shall include the supply and installation of all necessary approved expansion devices.




5. EQUIPMENT

5.1 CENTRIFUGAL/ SCREW CHILLERS - WATER COOLED

(a) General

Engage a specialist to test and commissioning the equipment, put it into operation, and carry out from the commencement of operation until the end of the maintenance period, the maintenance procedures recommended by the manufacturer including the giving of operational instructions.

Chiller shall be low noise, water cooled condenser, centrifugal/screw type compressors with highest effeciency.

Each chiller set shall be a proprietary factory-assembled packaged fully automatic chiller set in current production, of proven performance for the specified capacity and operating conditions, comprising centrifugal/screw compressor, motors, evaporators and condensers, and control panel, all mounted on a common structural frame and equipped with the components and accessories necessary for unattended automatic operation, including but not necessarily limited to integral piping, unit-mounted controls, electrical wiring, thermometers, gauges, and the like. Arrange access and external service connections suitable for the specified installation. The equipment shall be suitable for internal installation in sea side area at all weather environment.

(b) Construction Standard

The following standards (current edition) are referred to in this section:

● AS 1023 Low Voltage Switchgear and Control Gear – Protection of Electric Motors

● AS 1044 Radio Interference ● AS 1210 SAA Unfired pressure vessels code ● AS 1359 General requirements For Rotating Electrical Machinery ● AS 1677 Refrigerating systems ● AS 2129 Flanges for pipes, valves and fittings ● AS 2279 Disturbances In Mains Supply Networks ● AS 2625 Rotating and Reciprocating Machinery – Mechanical

Vibration ● AS 2372 Control Cables For Electrical Supply Systems ● AS 3000 SAA Wiring rules ● AS 3008 Electrical Installations – Selection of Cable

(c) Testing

All water-cooled chiller sets set shall meet the following requirements:

(i) Power consumption:

Measured specific power consumption shall be not more than 105% of the specified maximum power consumption.

(ii) Capacity:

Measured capacity once adjusted using the evaporator fouling factors as listed below shall be not less than 100% of the specified capacity.




(iii) Acceptance test requirement: For each chiller to be supplied, demonstrate by certified factory test measurements and calculations prior to delivery that the chiller set meets the specified performance requirements at full load output in the fully fouled condition. Use tube-fouling factors for copper tubing as follows:

Clean Fouled

Evaporator 0.0m² k/kW 0.044m²k/kW

(iv) Additional data: Record the following during the factory test: data sufficient to identify the chiller set package, including make, model, serial number and refrigerant.

(v) Motor nameplate data: Settings of gauges, meters, overload and safety devices, controls etc.

(vi) Pressure test: To AS 1677, Clause 4.6. Works test refrigerant system to at least 1.5 times working pressure.

(vii) Refrigerant leaks: Test for leaks with a halide torch.

(d) Requirements Each refrigerant circuit shall be completely independent of the other such that failure of any refrigerant circuit shall not affect the other circuits. Each refrigerant circuit shall include: ● Full flow refrigerant drier complete with bypass circuit; ● Moisture indicator and sight glass installed in a accessible and visible

location; ● Thermostatic expansion valves to be pilot operated, externally equalized

thermal expansion valves complete with solenoid valves for each stage; ● Compressor suction strainer; ● Compressor discharge muffler; ● Compressor service valves; ● 100mm diameter refrigerant suction and discharge pressure gauges and oil

pressure gauge mounted in an accessible and visible location; ● Internal relief valve for the compressor; ● Oil level sight glass; ● Compressor crankcase heater; ● Oil sump plug

Each refrigerant circuit shall be connected to a shell type evaporator containing minimum 20mm diameter valved water drain and vent connections. The drain connections shall be piped to a tundish. The evaporator shell shall be insulated and metal sheathed and designed and constructed as a pressure vessel in accordance with AS 1677 Clause 3.1 and AS 1210 for a certified water side working pressure not less than 1000 kPa and for a certified refrigerant side working pressure as specified in AS 1677 for the refrigerant used. Obtain a certificate of hydraulic test from the appropriate Authority. The refrigerant shall be HCFC 134a or as approved. All water connections shall be flanged to AS 2129. Coils shall be copper tube aluminum fin mechanically bonded enclosed in a galvanised sheet steel frame. Aluminum fins to be protected by dipped and baked epoxy resin coating for corrosion and weatherproof protection. Each condenser shall be equipped with its own modulating head pressure control.




Each refrigerant circuit shall be equipped with its own liquid receiver designed and constructed as a pressure vessel in accordance with AS 1677, Clause 3.1 and AS 1210 for a certified working pressure as specified in AS 1677 for the refrigerant use. Obtain a certificate of hydraulic test from the appropriate Authority. Each liquid receiver shall incorporate a relief valve piped to atmosphere in accordance with AS 1677. Liquid receivers shall be sized to accommodate the full refrigerant charge of the system.

(e) Controls and Interlocks Comply with AS 3000. For each chiller provide a chiller control cubicle. Within this control cubicle mount the interlocks, time delays, relays, motor starters, breakdown fuses, capacity control, safety controls, and connections for interlocks with external pumps and flow switches and the like, necessary for safe and satisfactory operation, and for restarting the chiller set immediately upon restoration of interrupted power supply. Arrange safety controls such that operation of any one will shutdown only the associated circuit and will require manual reset before starting. Each chiller shall be supplied and installed with its own proprietary individual micro processor supervisory and control system complying with the chiller manufacturer’s requirements and mounted in the chiller control cubicle. This system shall be designed so as not to be affected by the compressor starting and running currents and associated vibration. When chiller installed exposed to the weather ensure all components protected accordingly and all electrical equipment in fully weatherproof enclosures. Chiller shall be included interface card to communicate with BMS system. Each supervisory system shall perform the following minimum control and monitoring functions: (i) Include an eighty-(80) minimum character alpha-numeric liquid crystal

display which spells out all system parameters in English. (ii) Digitally programming of essential set-points through user friendly operator

interface. (iii) Continuously monitor entering and leaving chilled water temperatures. (iv) Continuously monitor the following safety controls and cutouts for each

refrigerant circuit: ● High motor winding temperature ● High / Low refrigerant pressure ● Low oil pressure ● Low leaving chilled water temperature ● Low chilled water flow ● Associated chilled water pump contactor auxiliary relay. ● Crankcase heater operation ● Provision for connection for remote alarm

(v) Automatically start, load, unload and stop the compressors, with in-built time delays as recommended by the chiller manufacturer, as required to maintain the leaving chilled water set point temperature ± 0.5°C provided all safety interlocks are in their correct position once a remote start signal has been received.




(vi) Manual adjustment of the following: ● Leaving chilled water control set point ● Compressor lead/lag sequence

(vii) Display cumulative hours run for each compressor and total number of starts and power on meter

(viii) A manual reset push button to reset all associated safety controls for each refrigeration circuit

(ix) Automatically change lead/lag status of each compressor on a regular basis to maintain equivalent hours run.

Install a voltage free changeover relay for each refrigerant circuit in each chiller control panel and connect all associated safety and compressor starter faults to this relay.

(f) Crankcase Heater Connect each compressor crankcase oil heater from separate power supply input terminals in the associated motor control centre. This power supply shall be independent of the chiller start sub-circuit and isolated only by a separate switch on the compressor control cubicle. Provide visible indication on chiller control cubicle that power supply to crankcase heaters is available.

(g) Motors/Motor Starters Comply with AS 3000. Compressor motors shall be centrifugal/screw, liquid refrigerant cooled, drip proof, 1500 RPM maximum and selected for 105% of the maximum operating duty of the compressor. Each compressor motor shall be fitted with a starter mounted within the control cubicle on each chiller. Motor starters shall be especially selected and matched to the compressor motor. Select for maximum of four starts per hour and install timers so that this is not exceeded. Compressor motor starters shall be complete with the following: ● Rated for continuous operation; ● Rated for intermittent starting duty four starts per hour minimum. Timer

lockout to ensure duty not exceeded; ● Phase loss/in balance failure protection, under/over voltage protection; ● Manual reset thermal over current protection matched to the motor rating in

each active line to the motor; ● Manual reset protection of reduced voltage starter components from

overheating; ● Separate fault indicator light for each protection element; ● All other protection and control equipment recommended by the chiller

manufacturer. (h) Selection

Chilled water pressure loss across evaporator not exceeding 60kPa at specified maximum output when clean. Water velocities not exceeding 2.0m/s at specific maximum output

(i) Refrigerant Each chiller refrigerant shall be complete with a full charge of oil and refrigerant. Provide any additional refrigerant which may be required during the maintenance period due to failure of the system to hold the charge or other faults of the system. The refrigerant shall be HCFC R134a/ R123




(j) Installation and Maintenance Equip the chiller with lifting eyes. Install the chiller on ribbed neoprene, spring or inflatable air bag mounts to ensure 98% vibration isolation. The specialist shall advise on installation and carry out commissioning of the chillers and shall standby during the first two days’ operation after commissioning to instruct the operator and adjust operating conditions if required. The specialist shall prove and demonstrate all safety cutouts after installation and service the machines as recommend by the manufacturer during the Defects Liability Period including taking and testing oil samples. The specialist shall also change the oil and replace filters at the end of the Defects Liability Period.

(k) Testing and Commissioning Performance tests are required, tests shall make due allowance for fouling factors in accordance with ARI 550/66 requirements, however, the nominated capacities are a minimum requirement. The Principal reserves the right to inspect the chillers under manufacture and also to witness pressure, evacuation or running tests with four (4) weeks notice given prior to such tests shall be given Pre-commissioning check sheet shall be completed prior to commissioning. A certified copy of the set-up and commissioning procedure and log sheet shall be supplied. The chillers shall be commissioned to operate in a stable manner without hunting or surging throughout its operating range. All controls shall be calibrated and all control adjustment sealed.

(l) Preventative Maintenance The chiller manufacturer shall provide quarterly routine preventative maintenance for the chillers during the 52 weeks Defects Liability Period and shall submit a standard testing and maintenance schedule and a sample quarterly maintenance report sheet with the tender proposal. The supplier shall provide all consumable items required for this maintenance service including refrigerant, oil, filters, gaskets etc at no extra cost. After each quarterly visit the supplier shall provide the following: ● A written report detailing works carried out and the condition of the

equipment. ● A complete inspection and maintenance check list.




5.2 COOLING TOWER

(a) General Comply with requirements of AS 3666 and relevant local Statutory Authority Technical Directives. Demonstrate correct performance selection by reference to type test results and calculations allowing for actual site enclosure conditions. Verify performance by field performance using Cooling Tower Institute acceptance test Code ATC-105 conducted within the warranty period. Should the test tower prove deficient to meet codes and specification all costs for correcting the deficiency and re-test is on the contractor. Have no more than 0.02% drift loss.

(b) Type Factory assembled of rectangular counter flow type of approved manufacturer, constructed generally of fibreglass and PVC complete with fan, water distributing system, fill, tower basin, sump, drift eliminators, valves and fittings. Select capacity of tower rated to suit location indicated on Drawings, with adequate clearances for installation, operation and maintenance. Install externally to the building designed to withstand maximum stress imposed by winds equivalent to 1.5kPa of project surface.

(c) Structure Fibreglass reinforced polyester or PVC construction manufactured from UV stabilised non-corrosive materials, all fastenings of stainless steel. Fit casings with access doors/panels required for access to all internal parts, including water distributing system, without the removal of the fill. Support legs, framing and structural members from steel, hot dip galvanised after fabrication. Use stainless steel for metal parts, including nuts, bolts, brackets and other hardware within wetted areas or in air steam.

(d) Water Basin and Distribution Floor sloped to an integral sump fitted with a removable screened suction outlet connection, overflow, valved drain and float controlled make-up connection. Water distribution system designed for 140 percent of the specified capacity without causing overflow or splashing. Nozzles splash plates to be poly acetal, brass, aluminium, alloy or other corrosion resistant materials. Nozzle type: Low loss replaceable. Water distribution piping: Polypropylene or other non-ferrous material. Have quick fill and ball float water makeup connection Manual cooling tower sump drain size of 40mm for small towers 50mm for large towers.

(e) Tower Fill Corrugated honeycomb packs for tower fill, removable or otherwise made accessible for cleaning.

(f) Fans Slow speed direct or belt driven, quiet in operation and-statically and dynamically balanced. Impeller: Aluminium alloy or glass reinforced nylon attached to a stainless steal shaft. Centrifugal units: glass fibre reinforced fan scroll, hot dip galvanised and epoxy painted impeller, stainless steel shaft, cast iron taperlock pulley motors.




Motors and drives to comply with ‘Motors’ and ‘Belts, Pulleys and Drives’ Clauses in this Section of the Specification. Two speed motors when over 11kw or on variable speed drive.

(g) Access Ladders Hot dip galvanised or stainless steel, ready means of access to water distributing system and fans. Ladders and access generally to comply with local workplace Health and Safety regulations and AS1657 Cooling tower handrails need to be provided in accordance with AS1657




5.3 CENTRIFUGAL PUMPS

Pump shall be of the end suction horizontal spindle horizontal split case type, of back pullout design with spacer couplings to allow impeller and bearing assembly withdrawal without disconnection of pipework. Pump feet shall be positioned on the underside of the casing volute.

The pump shall be fitted with packed gland seals.

Pumps shall have an integral drip tray with copper drain pipe running to the nearest floor waste. They shall be of copper and extend beyond uninsulated pump flanges to capture all condensate drips.

Bearings shall be self-aligning grease packed ball or roller type of ample capacity designed for a life or not less than 100,000 hours continuous operation. Bearings shall be mounted in grease relief housings. All bearing housing shall be fitted with grease nipples of the same size and type.

Each pump unless otherwise specified elsewhere, shall be direct connected to a non-overloading 24 rev/s ball bearing squirrel cage motor. Motor enclosures shall be drip proof.

Motor shafts shall be given a multi-coat resin finish.

Pump and motor shall be assembled on a bedplate fabricated from rolled steel angle on channel sections with accurately machined facings for the pump and motor feet. The bedplate shall be dimmed or zincotate treated. The pump unit shall be completely finished painted prior to delivery on site.

The complete assembly shall be supported from the concrete plinth on inertia type bases and vibration isolators.

Gland well drains shall be piped to the nearest floor waste




5.4 PRIMARY AIR HANDLING UNITS (PAU)

(a) General

The units shall have the capacities as scheduled in the Schedule of Technical Data in Appendix B of this specification and certified by ARI/ASHRAE.

The units shall be of the outdoor type, packaged double skinned type in sections, horizontal draw through as stipulated in the Schedule of Technical Data

The units shall be of design to facilitate easy access and maintenance.

The units shall be anti-vibration mounted as stipulated in the “Noise and Vibrations” Section of this Specification herein.

All units shall be factory painted in accordance with the manufacturer recommendation and the “Painting, Colour Coding and Labelling” Section of this Specification herein.

Appropriate corrosion - resistant materials and assembly method shall be used to prevent corrosion including isolation of dissimilar materials against galvanic interaction.

Each component of the air handling unit shall have matching cross sectional dimensions as to ensure equal internal area for continuous airflow and to given a neat overall external appearance. There shall be no frame work protrusions.

All rotating components shall be mounted on a chassis fully isolated on spring/neoprene anti-vibration mountings from the framework and casing.

All unit sections shall be constructed to prevent drumming or distortion of panels up to a pressure differential of 2.5 kPa.

Plant items contained within the unit section shall be sized and selected in order to maintain specified face velocity restrictions stated in the schedule of equipment in this part of specification.

Unit sections shall be modular construction for ease of replacement or introduction of additional section. Sections shall be sized to suit the limited site access conditions.

(b) Casings

Casings shall be assembled from fully framed pent post design framework and covered with double - skinned enclosure panels and be designed and constructed to prevent drumming or distortion up to a pressure of 2.5 kPa.

Frames shall be made of heavy duty hot dipped galvanised steel sections or extruded aluminium, magnesium silicon alloy to provide maximum strength under the designed working conditions. Frames shall be specially locked so that there shall be no direct metal contacts to form condensation on the frames.

Frames connections, including main frames to sub-frames, main frames to main frames or sub-frames to sub-frames shall not be welded.

Main frames and sub-frames shall be so located that it is not necessary to dismantle the same for the replacement of the fans and cooling coils.

Base frames of heavy duty galvanised steel channels shall be provided for the units installation.




Panels shall be of double-skinned construction of 50mm thick comprising two 1.0mm thick galvanised sheets with CFC-free polyurethane foam insulation inside bonded tightly with both the internal and external skins without any air gap in between. No insulated panels shall form part of the unit construction members and the units shall not collapse while all panels are taken away. Infill insulation material shall be of injected type without collapse and any formation of cavities. Insulation materials shall provide a thermal conductivity not greater than 0.02W/m2 K at 10oC and comply with FSD requirements. Insulation shall be provided to all frames, structural stiffeners, any hollow parts of metal framework, and other exposed surfaces to prevent condensation occurring on the outer surface of the units. All insulation including facing and adhesive shall be to FSD approval. No insulation shall be exposed to the air stream.

All metallic screws and fasteners shall not penetrate the panels to form cold bridges.

Panels shall be fixed by means of quick release fasteners or snap-in retaining bars or hinged to the frames with locking handles and sealed by gaskets. Sufficient access panels shall be provided for proper lubrication and maintenance. Full access shall be provided to the inside of each unit and accessibility shall be demonstrated to the satisfaction of the Consultant.

Casings shall be extended for filter housings for the installation of air filters.

The panels shall fit within the framework and all joints for the panels shall be sealed with waterproof and air tight gaskets without any condensation on the panel surfaces. The gasket shall not be over compressed while the panel is on and shall be able to return to its original thickness while the panel is released.

All bolts and nuts used shall be stainless steel or bright cadmium coated steel.

Where units are in exposed locations, the casings shall be decoratively painted with a colour approved by the Consultant.

All panels shall be removable; however, panels not nominated as quick access panels may be securely bolted to the framework. Quick access panels shall be hinged unless plant access is restricted. Quick access panels shall have a locking device which gives a secure seal between frame, gasket and panel. Quick access panels shall include those for filter sections, cooling coil, fan section and transfer section. The entire construction of the quick access door including fixing of hinges and the locking device shall not form any cold bridges between the inner and outer part of the primary air handling unit.

Main access panels shall be provided for the fan sections, filter sections, access sections and elsewhere as indicated. The entire unit shall be mounted on a channel iron base frame.

The entire construction of the casing of the air handling unit shall comply to DW142 class B. Associated certificate/testing report shall be presented upon request by the Consultant.

The internal floor of the unit shall be flush throughout the unit and there shall be no lip at the access door. The unit shall be sluiced out without any blockages or pits.

The overall sound insertion loss level for the complete unit shall be not less than the following:

Octave Band(Hz) 63 125 250 500 1k 2k 4k 8k

SRI(dB) 22 24 29 32 31 35 42 44

The sound insertion loss must be presented at the time of tender and must be certified by the air handling unit manufacturer.




The sub contractor shall ensure that all holes for test and measurement purposes shall be carried out at the maker’s works and shall be strengthened at the inner and outer skin and tapped or threaded as required.

All metal frame-work shall be factory painted to protect against corrosion after construction.

At the maker’s work prior to packing and shipment, air handling units shall be finished with colour-coat coating. The units shall be finished internally with a white colour-coat.

The sub contractor shall ensure that all primary air handling units are adequately packed and protected prior to shipment and in transit to site. Similarly on delivery to site all air handling units shall be properly protected from damage until all work is completed and handed over to the Consultant

Any damage to finishes which may have occurred during transit, installation or otherwise shall be made good in the manner recommended by the manufacturer and to the satisfaction of the Consultant

(c) Access Sections

Access section shall be provided to allow air blasting or steam blasting of coils for cleaning and/or sterilising purposes. Adequate access must be provided both upstream and downstream of coils to facilitate cleaning and sterilising

Access sections shall be constructed as for casing construction with full encapsulated insulate hinged doors

(d) Fans

Supply air fans shall be double width, double inlet centrifugal fans of backward curved or aerofoil blades type unless otherwise indicated in the Schedule of Technical Data, and comply with the requirements stipulated in the “Fan” sub-clauses of this Specification herein.

For Acoustic Type Units specified in the Schedule of Technical Data the fans shall be single width, single inlet plug fans of aerofoil blade type and an acoustic target shall be located at the inlet of the fan at as pre-selected distance being a function of the quarter of the wave length of the predominant noise frequency.

All fan discharge sections and air distribution ducts shall be connected to the casings with flexible connectors.

Fan and motor assembly shall be mounted on a hot dipped galvanised base frame isolated from the main frame by means of anti-vibration isolators as stipulated in the “Noise and Vibration” Section of this Specification herein.

Main release panels shall be provided for fan sections to allow ease of access to the fan and motor and to enable the complete fan unit to be removed from the casing. All other planes shall be readily removable and pulley sections shall be located adjacent to the main release panel. Drive shall be complete with guards. Motors shall be located on slide rails for adjustment of belt tensioning.

(e) Cooling Coils

Coils shall be constructed of 12mm outer diameter heavy gauge seamless copper tubes with mechanically or hydraulically bonded chemically treated (non chrome acrylic or approved equivalent) aluminium fins, provided with chilled water flow and return headers, header connections, drain valve and air vents at the highest point. Coil sections shall be arranged to provide removal of coils from the access side of coil sections. Where coils are installed one above the other, intermediate drain pans shall be installed below each section. Coils shall be vertically split where specified and necessary to suit restricted plant room space.




The cooling coils shall be of sufficient area to prevent suspended moisture from being carried over into the air stream.

Maximum cooling coil face velocity shall be 2.5 m/s.

The maximum and minimum tube water velocities shall be 2.4 m/s and 0.3 m/s respectively.

All coils shall be fitted into the primary air units with no bypass of air around the coils; and gaskets to the approval of the Consultant shall be provided around the perimeter of each coil.

Coil supports shall be arranged so as not to penetrate the condensate tray and so that condensate cannot run down past the pans. Contact between dissimilar metals shall not occur and separating the materials with neoprene gaskets shall be essential. Large coils shall have immediate support.

The numbers of rows and fins per 25.4mm shall not be more than 6 and 10 respectively.

The coil shall have working pressure of not less than the working pressure specified in the Schedule of Technical Data or 1000 kPa whichever is the higher.

All coils shall be air test with the coils submerged under water at 1.5 times of the working pressure or 1500 kPa (whichever is the higher).

Coil connections shall be fitted with sealing rings and plates where penetration of the end sandwich panel occurs.

The performance of coils shall be certified in accordance with BS 5141 or ARI Standard 410

(f) Drain Pans

The drain pans shall be designed and installed according to recommendations stipulated in CIBSE TM-13. Collecting trays shall be double sloped to encourage rapid run-off of water and shall be individual removable for cleaning purpose. Drain connections shall not protrude above the base of the tray and thus prevent complete drainage.

Drain pans for cooling coils shall extend to cover all the headers and the like and shall be of at least 1.2mm thick proprietary made stainless steel grade 304 with water tight bracing joints and insulated with 25mm closed cell insulation of thermal conductivity of maximum 0.02W/m2.K at 10oC to prevent condensation.

Drain pans shall be connected to drain by means of a trapped waste through a vented air break. The trap seals shall be at least 50mm deep or 25mm deeper than the maximum fan pressure at the rated speed whichever is greater.

Intermediate drain troughs shall be provided at each tier of stacked cooling coils and with drain line to the main drain pain.

The trays shall have adequate upstanding edges and lips to prevent condensate overflow.

(g) Air Filters

Filters shall be as specified in the ‘Air Filters’ section of this Specification.

(h) Filter Housings

The housings shall be factory fabricated and assembled. They shall incorporate access doors, extruded aluminium tracks and individual holding frames designed to accommodate standard size filters in efficiency and construction rating specified for the installation. They shall permit interchangeability of filters from various filters suppliers.

The housings shall be furnished with hinged doors with locking handles at one side with the same construction materials as for the panels.




Filter mounting frames shall be of galvanised steel with factory installed gaskets of moulded polyvinyl chloride designed to accommodate the holding frame and eliminate air bypass. The filter mounting frames shall include integral pre-filter tracks for pre-filters as specified in the Schedule of Technical Data.

The holding frames shall be constructed of 16 gauge galvanized steel and equipped with gaskets and fasteners to prevent air bypass between the filters and frames, between the adjacent frames and between the frames and housing. The frames shall be able to accept fasteners to hold any style filter without the use of separate nuts and bolts.

All filters shall be erected and sealed within the air stream such that no air leaks around the filter bank or individual filter.

(i) Identification

All primary air units shall be provided with an identification plate showing the code number for each unit as indicated on the system schematics. This plate shall be securely fixed to the air handling unit casing in a prominent position.

In addition, each unit shall have a specification plate which shall show full details of the fan size, rpm, amperes, impeller diameter, fan characteristics, lubricants, air flows at specified duty, pulley and belt sizes, coil duties, filter media, water flow rates, design flow temperatures and any other information as may be required by the Consultant. This plate shall also be securely fixed to the air handling unit casing.

All primary air units shall bear the manufacturer’s nameplate giving manufacturer’s name, serial and model number and date of manufacture.

(j) Protection during Transport and Erection

Coil faces shall be protected by factory fitted sheets of Masonite or sheet metal to prevent fin and tube damage prior to testing and commissioning.




5.5 FAN COIL UNITS

(a) General

The fan coil units shall have capacities as scheduled in the Schedule of Technical Data or in Tender Drawings and certified by ARI/ASHRAE.

All piping serving fan coil units shall be isolated by rubber sleeves where suspended or attached to the structure. There shall be no solid connection between fan coil units and the structure.

The fan coil units shall be suitable for the actual resistance imposed on the air flow of the units due to ducts, grilles and diffusers. This added resistance shall be applied to all fan coil units whether shown to have ducts connected or not, and shall be taken as a minimum of 50 Pa (external to the unit).

The fan coil units shall be of the ceiling concealed type as indicated on the Schedule of Technical Data, comprising cooling coils, direct electric motor driven centrifugal fans and condensate drain pans.

(b) Coils

Cooling coils shall be constructed of 12mm outer diameter copper tubes with mechanically or hydraulically bonded aluminium fins. The coils shall have working pressure of not less than those specified in the Schedule of Technical Data or 1000 kPa (whichever is greater). Coils shall be provided with air vents at the highest point and a drain valve. Coils shall have the rows not less than three and not more than four.

All coils shall be air tested with the coils submerged in water at 1.5 times of the working pressure or 1500 kPa (whichever is greater).

(c) Fans

Each fan coil unit shall be provided with one or more statically and dynamically balanced aluminium blade forward curved centrifugal supply air fans, which shall be direct driven from a single phase permanent split capacitor motor.

Motors shall be of three speeds, sleeve bearing types, with accessible extended oil tubes and oil reservoirs, and shall incorporate thermal overload protection.

The fan casings shall be constructed of galvanised steel sheets.

(d) Motors

Fan motors shall be of the ‘split-capacitor’ type suitable for single phase electrical supply with a power factor of not less than 0.85. The motors shall be resiliently mounted to the fan tray or scrolls. The motor/fan trays assembly itself shall be also resiliently mounted to the casing structure. The trays shall be easily withdrawable for inspection and cleaning after disconnecting from the mains supply and ancillaries with the plugs and sockets provided.

The motors shall be capable of providing at least three fan speeds (plus on/off) and shall be of adequate capacity to prevent overloading at any speed and duty of the fans.

(e) Filters

Filters shall be as specified in the ‘Air Filters’ section of this specification.

Temporary filters of the throwaway type shall be provided for all units fitted at the manufacturer factory. These filters shall be fixed in position during installation and testing and shall only be replaced with the final filters after the completion of commissioning.




(f) Drain Pans

The design and installation of drain pans shall comply with recommendations of CIBSE-TM13.

Insulated drain pans shall be provided to collect all condensate from the cooling coils including water headers and return bends where necessary. Auxiliary drain pans shall be provided to ensure total drainage and complete freedom from condensate with the air conditioned places. Drain pans shall be of heavy galvanised steel construction.

Drain pans shall be insulated with a minimum of 25mm insulation of a type approved by the Consultant.

(g) Access Panels

Access panels shall be provided at the supply and return air ducts such that fan motors can be removed and cooling coils can be cleaned without taken down the fan coil units.

(h) Cabinets

Cabinets shall be factory-made and of 1.0mm thick braced steel panels with channel formed edges. The bottom panel shall be hinged for access.

Cabinets shall be chemically cleaned, neutralized and treated with phosphate. The painting shall comprise a primer coat, followed by baking and a finishing coat of baked enamel. Where units are mounted in an exposed location, the casings shall be decorative type with a colour approved by the Consultant.

Unless specifically mentioned elsewhere, all horizontal ceiling hung units shall have supply and return air plenum casings. As a standard arrangement, these plenums shall be provided for air duct connections at the back and front of the units. The design and construction of the casing shall be such that the standard arrangement may be reversed, if required, to provide bottom return air by simply moving the rear panel to the bottom of the unit.

Casing/plenum shall have sufficient access doors for filter, coils, fans, and the like. Access to filter for cleaning shall generally be by opening the hinged central core of the return air grille unless otherwise shown on the Drawings. The mounting frame for the grilles shall include fixing for the filter.

The interior of casings shall be lined with 25mm microbus and shall be sealed to prevent any condensation whatsoever. Insulation shall also be protected against migration of fibres in the air stream.

Where imported casings are provided, the manufacturer’s standard insulation provisions may be acceptable provided that details of these are submitted for Consultant/Consultant’s approval prior to ordering.




5.6 VARIABLE AIR VOLUME (VAV) BOXES

(a) General

Include discharge plenum and variable air volume controls and factory tested.

Provide open drip proof (IP32) type motors or TEFC.

Provide solid hot rolled steel drive shafts, accurately turned and polished to a close tolerance where in contact with bearings. Secure VCD to the drive shaft by a key and keyway assembly.

Construct wheels/impellers of mild steel, hot dip galvanized, and finished with two layers of factory applied non-scaling paint.

Electrically ground drive to prevent accumulation of static charge.

(b) Casing

Casings shall be fully insulated, double wall construction.

Construct individual section casings of galvanized sheet steel, minimum 1.31 millimeter thickness, and internally reinforced with galvanized steel angle framework. Finish outside of casings with a minimum of two layers of corrosion inhibiting coatings with [one (1) layer of galvanizing and one (1) layer of polyester based paint]. Finish inside with one (1) layer of galvanizing.

Internally line casings with minimum 50mm thick, 64-96 kg/m3 density rigid fiberglass insulation. Secure installation to the casing surfaces and framework with adhesive over the entire surface. Cover insulation with inner casing wall. Injected foam insulation is be acceptable in place of fiberglass insulation providing the acoustic and thermal performance is equal to fiberglass insulation as specified.

Fully gasket individual unit sections between flanged joints and fasten together with washers, nuts and bolts to produce an airtight assembly.

Seal all openings through the casing, such as electrical conduit with neoprene grommets or sealed patch plate construction to prevent passage of air and sound.

(c) Discharge Plenum

Provide supply air discharge plenum with well construction. Line inner surface of the outer wall with a single layer of 50mm acoustic duct lining (rigid board). Provide inner wall minimum 1.15 millimeter thick perforated sheetmetal (20% to 30% open area).




5.7 VARIABLE FREQUENCY DRIVES (VSD)

(a) General

Comply with the General Services Requirements section.

This specification applies to simplified drives for fans or centrifugal pumps where power varies as the cube of the speed. It is not suitable for conveyors or other machinery drives.

Related Sections:

Comply with the following sections relevant to variable speed drives:

- Mechanical Control System

- Mechanical Services Switchboards

- Noise and Vibration

Standard

To AS/NZS 60947.1 Low-voltage switchgear and controlgear - general rules.

(b) Quality

Submit the following:

- Certificates of compliance to each applicable standard.

- All testing report.

- VVVF drive manufacturer’s certification that motor winding temperatures will not exceed AS 1359:101, Class B temperature limits when operating at full load with controllers.

- Shop drawings detailing speed controller installation dimensions and clearances for cooling air flow.

- Manufacturer’s installation and wiring instructions. Production tests:

- Burn-in drives for 1 hour at 40°C ambient whilst cycling from nil to full load.

(c) Variable Speed Drives

Description

Type: Enclosures containing solid state electronic variable voltage, variable frequency motor drives with associated capacitors, reactors and filters. Alternatively, where motors are readily accessible, provide integrated motor/controllers.

Application: Soft starting and variable speed control.

Selection: Match the drive load/torque profile for the motor and load for each operating condition.

Configuration: Provide a separate drive controller for each motor unless shown otherwise.

Duty and Characteristics

Load type: Variable torque axial or centrifugal fan or centrifugal pump.

Continuous output current: ≥ motor nameplate full load current at 380V 50Hz.

Starting torque > 70% of full load torque.

Controlled maximum inrush current during starting: 130% of full load current.




Output frequency range: Infinitely variable, 0 to 50 Hz.

Ambient temperature adjacent to controller: 40°C max. Controller to operate at full load, full speed and also with 20% overload for 30 seconds without derating motor or controller.

Ambient humidity: <95%RH.

Displacement factor (fundamental power factor) at any speed or load: 0.98 minimum.

Total power factor at full motor load and at all speeds (calculated from input power based on fundamental current and total input kVA based on RMS current including harmonics to 19th): 0.9 minimum.

Overall efficiency of frequency converter (including losses in filters) at maximum rated load and speed: ≥97%.

Noise Level - Maximum increase in noise level of motor with drive operating at any load or speed when compared with operation on 50 Hz mains power: 5 dB in any octave band.

Enclosures: Controllers, filters and accessories mounted in common type tested enclosures supplied by the controller manufacturer. Enclosures degree of protection to AS 60529-2004, Degrees of protection provided by enclosures: Indoor IP54, outdoor IP65.

Small controllers may be integrated with their motors.

Major Components

- Rectifier: Six pulse, controlled or uncontrolled. Select to meet harmonics requirements.

- EMC, harmonics and power factor control.

- Phase to phase and phase to ground surge protection.

Input Power

Operating tolerances: Controller to operate continuously at full load within the frequency tolerances and without tripping:

Mains at point of supply: 220V, 380V, ±10%, 50Hz, ±2 Hz, 3 phase a.c.

Emergency/standby generator at point of supply: Tolerant to 220V, 380V±20%, 50Hz ±5Hz, 3 phase a.c.

Allowance for voltage drop from point of supply to controller line terminals: 0 to 5%.

Tolerance to interruptions: 0.5 seconds

Output Power

Voltage ramp: Energy optimised varying V/Hz ratio for cube law relationship between power and speed, with start up override.

Voltage compensation: Automatic correction of output voltage during mains variations within tolerances to prevent loss of motor torque or speed.

Output voltage rise time and peak voltages: To IEC 60034.17.

Maximum rate of voltage rise: motors ≤ 4kW – 500V/μs.

motors > 4kW – 1000V/μs

Output cable length: 100m long screened cables without motor derating.




Harmonics:

Comply with Supply Authority requirements and National Electricity Code.

Standard: To AS/NZS 61000.3.6 Electromagnetic compatibility (EMC) - Limits - Assessment of emission limits for distorting loads in MV and HV power systems.

For installations required to comply with AS/NZS 61000.3.6 Stage 2 limits.

Total harmonic distortion: 5% maximum.

Control and Monitoring Systems

Control type: Fully digital with microprocessor control of frequency, voltage and current.

Programming: Drive setup and adjustments stored in non-volatile memory (EEPROM), without analog or potentiometer adjustments.

Keyboard: For manual-off -auto speed control, alarm and diagnostic functions, and with password protected programming.

Local Indication: Externally visible LED or LCD display of programming, operating, fault time and cause, pre trip, and diagnostic information in plain English with continuous display of output frequency.

Remote control and indication: Stop-start control, status and common fault indication and speed indication.

Speed control: Open loop control to maintain ±0.1% of motor rated speed over the range of motor speeds. Input signal: 0-10V d.c or 4-20mA d.c.

Alarms: Voltage free common alarm contacts opening on fault for connection to mechanical services control system.

Controls interfaces and terminal blocks: Separate from power terminals. Control System Functions:

Provide the following:

- Separate and independently adjustable maximum and minimum speed settings.Set at 50Hz and 20Hz respectively, unless shown otherwise.

- Independently adjustable acceleration and deceleration times up to 180 seconds.

- Current limiting to prevent nuisance trips due to temporary overcurrent situations.

- Fire mode default: Fans required for fire mode to run at preset speed with motor protection and controller non-critical faults (eg. heat sink) inhibited to AS 1668:1, Fire and smoke control in multi-compartment buildings. Comply with clauses 4.8.1, 4.12.1, 4.12.3 and 5.5.5. Alternatively provide fire mode starter and bypass contactors.

- Automatic restart after power loss or recovery from minor faults, with three restart attempts. Shutdown and alarm on failure to restart.

- History of faults (minimum three events) with time and date of occurrence and diagnostic details to be retained on loss of power.

- Starting of rotating motor with controlled deceleration or acceleration if the motor is backward rotating or forward.

Fault Protection

Provide monitoring of the following faults, instantaneous shutdown, and display on the diagnostic panel:

- Mains phase loss




- AC input under-voltage protection

- AC input over-voltage protection

- Inverter over temperature

- Output overcurrent

- Output short circuit, phase to phase and phase to ground.

- Output earth fault

- Motor thermal overload protection – refer Motor Protection below.

- Motor phase loss.

Where multiple motors are connected to a master controller, provide full fault and overload protection for each motor individually.

Indication when the D.C. bus is charged, and a safety circuit to discharge the bus when power is isolated.

Installation

Location: Install controllers within 15m of motors and external to switchboards. Do not exceed manufacturer’s distance limits. Mount units individually.

Cabling:

- Provide cabling and terminations in accordance with published recommendations of the controller manufacturer.

- Minimise the length of cable between drive and motor.

- Run all cabling to and from speed controllers separately and in separate trunking from other electrical, control and communications cables, crossing other cables at right angles.

- Provide trefoil power cables with cross-braided copper wire shield between controllers and motors and earth the shields at both ends.

- Earth controllers directly to an earth bus connected to the main building earth.

- Earth motors directly to the PE terminal of the converter, and not directly to the switchboard, to minimise circulating earth currents.

- Provide individually shielded pairs of cables for control and instrumentation wiring, with shields earthed at one end, only, remote from the controller.

Isolation

- For drives ≥55 kW provide control isolators at motors connected to shunt trip circuit breakers at switchboards.

- For drives <55kW provide power isolators at motors.

Commissioning

Harmonics: Conduct harmonic tests at the point of common coupling (PCC) and at the in-plant point of coupling (IPC) the converter input terminals for third to nineteenth harmonics under a full range of load conditions to demonstrate compliance. Submit test results.




5.8 AIR FILTERS

(a) General

All filters shall have performance as specified in the “Tables of Performance” of this Specification and be installed as shown on drawings. At the completion of acceptance testing of all air handling units and before handing any air handling systems over to the Client/Principal, all filter media shall be replaced with clean new filter media.

All filters in any bank shall be identical.

(b) Medium Efficiency Filters

These shall be provided for all Fan Coil Units and ventilation systems. The minimum air flow capacity of each filter shall be able to match future capacity of fan/motor systems (10% minimum) and allowance for duct leakage (5%).

The filters shall be of throw away 100mm thick deep panel type for air conditioning systems and ventilation systems respectively with a minimum filtration efficiency of 20%, 98%, 85%, 88% on test dusts Nos. 1, 2, 3 and 4 with a dust holding of not less than 600 gram per m2 of face area when tested with No. 4 dust (NATA tested) at final resistance of 125Pa above initial resistance.

(c) Filters - Deep Bed

The filters shall be deep bed dry media type. They shall be contained in a rigid frame in the mixing box. The duct section containing the filters shall be provided with an adequate access panel to allow easy replacement of the filter elements.

The filters shall conform to the following scheduled requirements:

● All filters in any bank shall be identical.

● Filter holding frames shall be constructed from mild steel sheet not thinner than 1.6mm and shall be galvanised or treated with other approved corrosion protection.

● Alternatively, aluminium sheet not thinner than 2mm may be used, in which case no corrosion protection treatment will be required. Each holding frame shall be pre-drilled to a template to allow multiple assemblies into banks or insertion into ductwork.

● The sealing between filter media and frames and filter frames and unit casing shall be such that no air bypasses the filter. Where filter frames are required to be bolted together approved [felt/mastic sealant] sealing strips shall be supplied. Filter frames shall be of adequate strength and rigidity to resist distortion and buckling under any multiple arrangements of filter cells.

● Filters shall be held into frames by means of approved quick acting clamps such that they shall be easily removable for cleaning and/or replacement.

● Filters shall be tested for performance whilst in their operating configuration with the result being given to the consultant.

(d) Pressure Differential Gauges

Each filter bank shall be provided with a dial pressure differential gauge to indicate filter pressure drop. Each gauge shall have a zero setting facility. Labels indicating “Filter Clean” and “Filter Dirty” shall be attached to the gauge by screws at those points on the scale recommended by the manufacturer as being the clean and dirty resistance.

The pressure differential gauge shall be mounted on the return air plenum of the air conditioning unit.




5.9 AXIAL FLOW FANS

(a) General

Supply and install axial flow fans as specified on the drawings scheduled later in this section of the specification.

Fans shall have limit load characteristics.

In case of fans built into proprietary line equipment, the manufacturers’ standard construction may be accepted. Tenders shall state in what manner the item offered differs from this specification.

Fans shall be tested as part of the specified tests on the completed system.

Resilient bearing mountings shall be used when they are available and suitable.

Blades shall be of aerofoil section made of aluminium or glass fibre reinforced plastic. They shall be adjustable in pitch angle and positively locked into the hubs. By adjustment of pitch angle alone and without changing the motor, fans shall be capable of delivering the specified flow rate at system resistances from at least 10% below to at least 10% above the sub contractor’s assessment

(b) Materials

The materials shall be as follows:

Fan Location Shaft Casing

Exposed to weather Stainless Steel Mild Steel

Other Location High Tensile Steel Mild Steel

Materials shall conform to the following standards

Mild Steel Sheet AS3678 & AS3679 Stainless Steel Sheet

BSS 970-EN58A or EN58B (Equiv. Comsteel 302, 321)

High Tensile Steel Shafting AS-97 S1040 or BSS 970-EN8

Stainless Steel Shafting BSS 970-EN57 EN58B (Equiv. Comsteel 431)

(c) Casing

Fan casing shall be of heavy material and at least the length of the fan/motor assembly. Casing shall be fitted with mounting flanges at both ends and also with drilled matching flanges.

Provide terminal box and access panel to the moving parts in accessible positions on the casing.

(d) Shaft

Drive shafts shall be designed such that the first critical speed of the shaft is at least 130% of the normal operating speed of the fan.

(e) Bearings

All bearings shall be semi-self aligning ball or roller type selected for a life expectancy of 300,000 hours. Tolerances shall be such as to ensure specified noise levels are not exceeded. Axial thrusts, where shafts exceed 30mm shall be taken by ball thrust bearings. In other cases, deep-groove ball bearings may be used. All bearing housings shall be dowelled and have individually identified packer plates. Bearings shall be sealed with felt or “Gaco” type seals with




provision for relieving excess grease pressure. All bearings shall have grease pipes and nipples mounted in easily accessible positions on the casing.

(f) Belt Drives (where scheduled)

Belt drives shall be by matched vee belt, with a minimum of 2 belts per pulley. Provide approved means to facilitate adjustment. Provide and fit an approved easily removable belt and pulley guard. Drives shall have a power rating 30% in excess of the motor power rating. Carefully align the drive to yield minimum noise. Belt guard shall be fully enclosed inside the casing and also outside where exposed to the weather. Arrange for easy replacement of belts.

(g) Balancing

All rotating parts shall be fully statically and dynamically balanced.

(h) Vibration Isolation

Each fan/motor assembly shall be mounted on combination spring/ribbed neoprene mounts so located that they deflect uniformly. Springs shall have a mean coil diameter not less than 80% of the loaded spring length. Springs shall be capable of 150% of the specified static deflection. Mounts shall be provided with lock-nutted levelling screws.

Static deflections shall be as set out below:

Rev/sec Floor on Solid ground

Suspended floor span up to 9m

Suspended floor span 9m and above

Above 8 9.0 25.0 45.0

6 to 8 9.0 63.0 63.0

5 to 6 9.0 63.0 70.0

Provide inertia block as necessary.

Where fans are mounted with their axis horizontally and where necessary to prevent axial movement from stretching or compressing ductwork flexible connections, end thrusts shall be taken by spring mountings fixed to rigid angle iron frames. These mountings shall be equal to Mason SLF with acoustical isolation cups and a minimum deflection, when in operation at full system resistance, of not less than 50mm. Flexible duct connections shall be arranged to suit with a metal support ring inside the inlet of the flexible to prevent the flexible being sucked into the duct.




(i) Motor

Motor speeds shall not exceed 25 rev/sec

Motors shall have a rated capacity 100% above the duty specified.

(ii) Connections

Connections to ductwork shall be by means of slack flexible connectors fabricated from PVC coated fabric of mass not less than 570 gr/m2 free lengths shall be not less than 70mm

(iii) Transportation

During transport, impellers shall be adequately supported to prevent brine ling of ball and/or roller bearings.

(iv) Corrosion Protection

Surfaces shall be treated as set out below:

Item Location Other location Exposed to weather

Inside of MS casing Method A Method B

Outside of MS casing Method D Method C

Other MS parts Method D Method C

Shaft - Bare

Key to methods is as follows:

Method A Hot dip galvanise, if not too large, otherwise molten aluminium spray 0.10mm thick followed by one coat tar-epoxy enamel

Method B Molten aluminium spray 0.10mm thick followed by one coat of tar-epoxy enamel

Method C Clean down, prime with zinc-rich paint, apply one undercoat and one top coat of approved gloss enamel

Method D Hot dip galvanise if not too large, otherwise molten aluminium spray 0.10mm thick followed by one undercoat and one coat approved gloss enamel




5.10 CENTRIFUGAL FANS

Centrifugal fans shall comply with all relevant codes, following requirements and the schedule of capacities in this specification.

● Type: Centrifugal SISW

● Material of Manufacture: Steel, standard construction

Each fan/motor assembly shall be mounted on a common steel base, fitted with anti-vibration spring mounts.

The casing shall be rigidly constructed and provided with:

● Inlet and outlet flanges. ● An airtight access panel. ● An inlet cone, contoured for efficient air entry ● Inlet guards.

The casing, bearing and motor supports shall be of rigid construction and free from flexure.

Fan shafts shall be designed such that the first critical speed of the shaft is at least 130% of the operation speeds of the fan.

Fan shafts shall be fitted with self aligning ball or roller bearings designed for a life factor of 100,000 hours.

Bearings shall be of the “sealed for life” type.

Belt drives shall consist of not less than (2) belts, evenly matched and designed in accordance with the manufacturer’s recommendation to achieve belt life.

Each fan motor and motor starter shall comply with the requirements of the clause “Electric Motors” elsewhere in this specification. The power output of each motor shall not be less than the sum of the fan power requirements (based on continuous maximum rating at the specified speeds) and the drive loss power.

The complete assembly of the fan’s rotating components shall be statically and dynamically balanced and the fan-motor assembly shall be provided with anti-vibration mountings.

The fan unit shall be corrosion protected in accordance with the requirements specified under clause “Corrosion Protection and Painting” elsewhere in this specification.

5.11 IN-LINE CENTRIFUGAL FANS

In-line centrifugal fans shall basically comprise a direct driven centrifugal impeller with electric motor, mounted in an impact resistant casing.

Fans shall be duct mounted or wall mounted as scheduled. Wall mounted units shall incorporate non-return louvers.

The impeller and motor assembly shall be statically and dynamically balanced.

5.12 PROPELLER FANS - WALL OR CEILING MOUNTED

Propeller fans shall basically comprise a direct driven propeller fan housed in an impact resistant casing. Fans shall incorporate backdraught dampers where scheduled.

The impeller and motor assembly shall be statically and dynamically balanced.




5.13 EXHAUST FANS - ROOF MOUNTED

Fans shall be vertical discharge type with housing of moulded shock-resistant and sound-absorbing fibreglass. Basket supports and all fastenings shall be of stainless steel. The fan housing colour shall match that of the adjacent roof sheeting. Impeller shall be backward inclined type, with non-overloading characteristics.

Motor shall be mounted out of the air stream and be totally enclosed type.

Fans shall be either direct-driven or belt-driven as specified in the Tables of Performance and be complete with adequate anti-vibration mounts.

Roof mounted fans shall be mounted on kerbs provided and under-flashed by the Main Contractor but this Contractor shall be responsible for ensuring that fan support skirt provides all necessary over-flashing protection to eliminate any water penetration. Fans operating in smoke exhaust mode shall comply with AS1668.

5.14 CLOSED TYPE EXPANSION VESSEL

Supply and install closed expansion vessel to the chilled water system as shown on the drawings as specified herein

The vessel shall be adequately sized to allow for full expansion of the water content of the system.

The vessel shall have an isolating valve, drain valve for cleaning.




6. DUCTWORK & FITTINGS

6.1 GENERAL

This section of the Specification covers the general requirements for ductwork, ductwork accessories, and associated air control devices, unless the general requirements are abrogated by specific requirements elsewhere in the Specification or Drawings.

The sub contractor shall supply and install all ductwork and accessories for the correct and satisfactory operation of the air systems covered by this Specification.

All ductwork and fittings delivered to site shall be new and shall be clearly and indelibly stamped to identify different grades, materials and manufacturers.

All air supply, return, intake and exhaust fittings shall be of the respective types as shown on the Drawings

All ductwork, fittings, accessories, joints and jointing materials shall be suitable for the service and shall not deteriorate due to atmospheric action.

All ductwork and materials including linings, adhesives, flexible ducts, flexible connections, gaskets, sealants, fibreglass boards, and the like, shall fully comply with all requirements of the FSD in respect of resistance to penetration of fire and spread of flame and smoke.

The materials, construction and installation of all sheet metal ductwork and fittings shall be in accordance with the Specification for sheet metal ductwork, DW/142 (MVAC). Where any part of the installation is not covered by the MVAC Specifications, then the standard of the Sheet Metal and Air Conditioning Contractor's National Association of U.S.A. (SMACNA) latest edition shall apply for either high velocity or low velocity systems. Where any part of the installation shown on the Drawings is not covered by either the MVAC or SMACNA Standard, then reference shall be made to the Consultant for endorsement of materials and methods prior to installation.

The ductwork installation shall be leakage tested in accordance with Ductwork leakage testing, DW/143:1983 (MVAC). Complete record of the test shall be submitted to the Consultant on approved forms for endorsement. Should any test indicate leakage rate in excess of that specified by DW/142, the section of ductwork shall be dismantled, joints cleaned down and re-assembled and test repeatedly .

The Drawings indicate the clear internal air passage dimensions of the ductwork and the manner in which the ductwork systems shall be installed. Due allowance shall be made for the thickness of internal or external linings when dimensioning ductwork and selecting fittings and accessories. The actual work involved in respect of transitions, offsets, etc, shall be ascertained by the sub contractor, who shall co-ordinate the ductwork installation with the work of other trades and services.

Reasonable provisions shall be made by the sub contractor for future removal and dismantling of sections of ductwork by means of bolted, flanged joints and shall in all cases be approved by the Consultant prior to fabrication.




6.2 SHEET METAL DUCT MATERIALS

Generally, all ductwork shall be of hot dipped galvanized steel sheet to BS 2989:1975, Grade Z2, coating type 'C' as specified in DW/142.

Galvanised steel ductwork shall be fabricated from new, best quality, full sized galvanised flat steel sheets.

The pressure class and air leakage limit shall be as defined in DW/142. The pressure requirement for the ductwork system shall be as specified on the Drawings.

6.3 FLEXIBLE DUCTS

All flexible ductwork and accessories for insulated and uninsulated services shall be fully imported.

For insulated ductwork, the insulation shall be pre-factory insulated and of vapour-proof type of 25mm thick having a density of 24 kg/m3 and wrapped with aluminium foil.

Flexible ducts shall comply with the requirements of DW/142, BS476 Part 6 or UL181 Class 2 and shall be the Fire Services Department approved type.

All flexible ductwork shall be of the patent pre-insulated aluminium spiral wound type constructed of a tough multi-ply aluminium laminate, supported by a reinforced steel helix suitable for an operating temperature of -5oC to 90oC as approved by the Consultant and shall be suitable for the duties and pressures as required for the particular system.

Flexible metal ductwork shall be installed in all locations indicated on the Drawings of and/or wherever else necessary to eliminate transmission of vibration.

All bends made in flexible ducting shall be formed to manufacturer's recommendations and shall have a centre-line radius of not less than 1.5 times the diameter of the ducts. Bends shall remain at full diameter throughout the length of the bend and all bends deformed or damaged in any way during installation shall be replaced with new bends.

All fittings such as tee-pieces, Y-pieces and reducers shall be of galvanised sheet metal exactly as specified for circular sheet metal ductwork.

All joints between lengths of flexible ductwork shall be made with short spigots of galvanised sheet metal circular duct to form a slip joint. Similarly all connections to fittings and terminal boxes and the like shall be of the spigot slip joint type.

All joints shall be sealed with shrink-on type duct bands similar to "Thermofit" or approved equivalent except that continuous screw type metal bands hose clips or equivalent as approved by the Consultant may be used for low pressure applications only. Self tapping metal screws and rivets shall not be used.

All flexible ducts shall be adequately supported with hanger straps located, at a minimum of 2,000mm centres, to prevent undue sagging and strictly in accordance with the manufacturer's recommendations. Under no circumstances, should the flexible ductwork rest on the ceiling file or suspension system.

All flexible ductwork shall be air tight and leak tested in accordance with the requirements of this Specification.

Flexible ducts shall not exceed 3m in length




6.4 FITTINGS

(a) Joints and Fittings

All cross joints, longitudinal joints, take-offs, bends, transitions and other fittings shall be in accordance with DW/142:1982.

All flanges and steel works for jointing and supporting members shall be hot-dipped galvanized to BS729:1971, Part 1 or BS2989 whichever is applicable.

All joints for flat oval ducts for the medium and high pressure applications shall be sealed with shrink-on type duct bands similar to ‘Thermofit’ or approved equivalent.

(b) Ductwork Jointing Sealants

Jointing for flanged cross joints shall be formed from a gasket of 'Prestick' lead or other approved material to thickness not less than 4mm.

Sealant for longitudinal and slip joints shall be type EC/750C sealing compound

(c) Vanes and Deflectors

Vanes or deflectors shall be provided inside ducts where required. In particular, such vanes or deflectors shall be provided at all bends having an internal radius less than the width of the duct and also where the included angle exceeds 30o at changes of section. Vanes and deflectors shall be of aerofoil profile i.e. double-skin vanes to ensure complete change of direction of flow at the point, with extended leading and trailing edges, and with radii and spacing selected to achieve uniform velocity at the bend.

(d) Flexible Connections

Flexible connections shall be provided at the suction and delivery connections of all fans and air handling units and elsewhere as shown on the Drawings or as may be required to eliminate vibration.

All flexible connections for use at temperatures up to a maximum of 90oC shall be of neoprene coated glass fabric having a density of not less than 1 Kg/m2.

All flexible connections for use with temperatures in excess of 90oC and in "smoke spill" applications shall be of non-combustible woven glass fabric capable of withstanding 250oC under continuous operation.

All flexible connections exposed to the weather shall be covered with prime quality galvanised sheet steel or fibreglass weather shields arranged to form a complete weatherproof jacket.

All flexible connections shall be fixed over mild steel angle flanges at both ends and secured to same with not less than 2.5mm thick x 25mm wide mild steel bands. For circular ducts flexible connections shall be of the split semi-circular type drawn up tight with bolts at the split points. Flat bars for rectangular ducts shall be fixed with bolts or screws at not more than 150mm centres. The flanges to take the connections shall be not less than that specified for the ducts and the "free" space between flanges shall not be less than 50mm. The flexible connections shall be installed with not less than 25mm additional slack length between the flanges to prevent transmission of vibration.

Flexible connections shall not be used to correct misalignment of fan and duct.

Where flexible connections are used to connect fans to insulated ductwork, then flexible fibreglass of equal thickness as for ductwork insulation shall be fitted over the cloth and enclosed in a Sisalation 450 aluminium foil vapour barrier.

Where silencers are fitted to fans either on the suction or discharge side then flexible connections shall be of lead impregnated vinyl or other suitable material providing an acoustic barrier.




(e) Access Panels

Access panels shall be provided at the following locations for ductwork cleaning

● Within 600mm of every elbow ● At the end of each run ● Every 15 metres of straight run when there is no air grille

Access panels shall be provided at every point in the ductwork systems where access for checking, servicing and cleaning of equipment is required. Such equipment shall include all fire dampers, plenums, motorised dampers, fan chambers, air chambers, and the like. Where additional access panels are required for checking, servicing and cleaning of equipment not mentioned above, these shall be provided by the sub contractor.

The sub contractor shall supply and install access panels in ductwork, casings, or sheet metal partitions of G.I. double construction with insulation of the same general character as adjacent sections of ductwork and of not less than 0.8 mm sheet metal and shall have gaskets around their entire perimeter to ensure possible seal conforming to DW/142 leakage class specification as required by the system. Minimum size shall be 450 mm x 450 mm or 50 mm narrower than the duct whichever is smaller.

The sub contractor shall submit required location and sizes of any access panel in finished building surfaces and exposed areas for Consultant's approval in time to enable them to be incorporated into the construction. Access panels in building surfaces shall be supplied by the Main Contractor. The exact location shall be shown on the sub contractor's shop drawings.

(f) Volume Control Dampers

The sub contractor shall supply and install hand operated dampers where required for the proper regulation of the ventilating and air conditioning systems. In general, dampers shall be provided as follows:

● In all main supply and exhaust air ducts, branches, supply air connections to fan coil units and all fresh air supply outlets.

● Behind all supply and exhaust air diffusers/grilles.

● At the point of connecting flexible ducts to main ducts where flexible ducts are used for connection to air outlets.

All volume dampers shall comply with DW/142 and shall be provided in separate purpose-made flanged casings of rigid construction conforming to the same standards of air-tightness.

Materials for dampers in all cases shall be galvanised mild steel.

The damper spindles shall be provided with suitable seals when passing through the casing and penetrations shall be limited by the use of internal linkage.

Air leakage around dampers shall be less than 5% of the maximum design air flow when in the fully closed position

Dampers up to width of 300mm in the plane of rotation shall be of butterfly type or single leaf having blades of double construction fitted round a square spindle and the edges of blades shall be smooth and no sharp edges. The spindles shall be turned down at each end and be carried in substantial bronze bosses fixed to the sides of duct, with substantial cast quadrant pieces in an accessible position and with means of clamping after adjustment.




Dampers on ducts larger than 300mm shall be of multi-leaf opposed blade type, mounted in built-in frames inserted in the ductwork and bolted thereto. Individual blades shall be as specified for butterfly (or single-leaf) dampers, each shall be carried on solid spindle with ends housed in bronze or nylon bushes. The group of blades forming the damper shall be linked to a hand-operated mechanism, which shall be controlled by a quadrant in cases where the damper is accessible from ordinary working level and in all other cases, shall be provided with screw-operated remote-control gear with the winder at an accessible point.

After final testing and adjustment, all dampers shall be clamped in their correct positions which shall be marked on the quadrant in a permanent manner and stops-fitted.

(g) Back Draft (Non-return) Dampers

Back draft or non return dampers shall be provided as indicated on the Drawings and when more than one fans are connected to a common suction or discharge duct/plenum.

All frames and blades shall be fabricated from heavy gauge extruded aluminium alloy. Blades shall be single unit design, individually hinged on properly engineered aluminium stub shafts which rotate in flange nylon bushes.

Self-closing dampers shall present a minimum resistance to air flow under running conditions and take up a stable position in operation. Maximum resistance shall be presented under reverse air flow conditions such that they shall be forced to close and remain so. Resilient strips or other purpose made devices shall be provided to prevent the damper rattling and as an aid to air sealing under reverse flow conditions.

(h) Duct Flanges

Flanges for duct work shall comply with latest standard DW142/DW TM1. Certificates of test complying to such standard shall be submitted for the Consultant's approval.

Air leakage rates and deflection of the flanges shall be certified to meet DW142 and TM1. Flange sizes shall be selected to comply with DW142 table 5 to table 8.

The flange shall be a proprietary roll formed type from hot dipped galvanised sheet metal to BS 2989 G275 and be stainless steel for stainless steel ducts. Sealant shall be integral provided by the flange manufacturer.

The flanges shall be applied on site as per manufacturer's recommendations. The flanges shall be clamped together with screw lock clamps and using screw type wedge local clamp for positions which are hard to access.




6.5 DUCT SUPPORTS, HANGERS AND BRACING

The sub contractor shall be responsible for building in all supports and the like and all fixing details must be submitted for the Consultant’s approval.

No vibration whatsoever shall be transmitted from the ductwork of plant to the structure, and the sub contractor shall provide where necessary resilient mounting to achieve this.

The construction of hangers shall be in accordance with DW/142. All such hangers shall be provided with screw lengths or turnbuckles for adjustment of ducting runs to level. Welding of hangers to bearers shall not be permitted. All nuts shall be provided with washers and lock-nuts. Projecting ends of bolts shall be cut-off.

On no account shall supports be riveted or bolted to the air ducts.

All vertical ductwork shall be supported by angle iron bearers under flange joints.

All ductwork hangers shall be as follows:

Location Brackets, Supports and Hangers

External Location Hot dip galvanized to BS 729 and with a minimum coating of 85µm and with epoxy protective painting

Internal Location Hot dip galvanized mild steel construction to BS 729 and with a minimum coating of 85µm appropriate primed and painted

Painting shall be executed as stipulated in "Painting, Labelling and Finishing" Section of this Specification herein. All brackets shall be fixed by means of bolts and nuts or screws electroplated with zinc or cadmium to BS 3382-Part 1 and 2 of 25 µm minimum plating thickness.

All bolts and nuts shall be electroplated with zinc or cadmium to BS 3382-Parts 1 and 2 with min. plating thickness of 25 µm.

The ducts shall be tightened to underside of slabs/beams and after the projecting ends of bolts are cut off, no other part of the support shall project below the bottom bearers, thus maintaining maximum height throughout.

Lengths of steel angles and the like used in fabrication of the brackets, flanges and bracing shall be cut from full length sections. Short lengths of sections butt welded together to form a longer length shall not be used.

All hanger supports shall be placed as close as possible to transverse joints or bracings.

All ducts shall be carefully designed and provided with all necessary anchoring and flexible connections to prevent damage to either the ducts or the building structure due to expansion and/or contraction of the ducts or building.

All anchor points and flexible connections shall be shown on the shop drawings and specific approval shall be obtained from the Consultant before proceeding with the installation of any anchors or fixings to the building structure.




6.6 AIR OUTLETS

(a) General

All diffusers, registers, grilles, linear diffusers and other air terminal fittings shall be an approved types as specified in the following clauses and as shown on the Drawings for the MVAC systems. The sub contractor shall submit certified performance figures for each size and type of supply air terminal including the following information to the Consultant.

● Face velocity / Static pressure drop ● Throw in metres for terminal velocity of 0.25 m/s and 0.75 m/s. ● Sound power level data taken in a reverberate room and based on

ASHRAE standard 36-72.

The ceiling arrangement and type of tiles and suspension system, including type of air terminal fittings shall be checked before fittings are ordered.

Volume control dampers of opposite blade type shall be provided behind all supply, return, exhaust and transfer air diffusers, registers and grilles to control the air flow rates. Where flexible air ducts shall be used for the connection to the air outlets, they shall be dampered by butterfly dampers at the point of connections of the flexible ducts to the main ducts.

Samples of each type of outlet to be provided shall be submitted for approval. The samples shall be supplied with the specified finishes and in the colours nominated and shall be retained until the completion of the project. All outlets installed shall match the samples provided in quality of finish and in colour.

All volume controls where mounted behind grilles, registers and diffusers shall be finished in matt black paint.

Opposite blade dampers shall have blades linked together in sections for ganged operation from adjusting screws. Where opposite bladed dampers are mounted on the back of outlets or grilles, the screws shall be accessible through the blades of the outlet. Where the apposed blade dampers are mounted in the duct spigots back from the outlets, then the screws adjustment shall be accessible by removing the registers or grilles.

Outlets shall be fixed using concealed screws. Exposed fixing shall be rejected.

The sub contractor shall liaise with the Main Contractor regarding details of the air outlets with respect to constructional, fixing and dimensional details for the correct fitment and performance.

Shop drawings showing the construction and interface details shall be submitted to the Consultant for approval.

Upon first approval by the Consultant on the samples, the sub contractor shall provide a mock up installation.

Upon approval by the Consultant on the mock up production units shall be manufactured and delivered to site.

The sub contractor in liaison with the Main Contractor and other Contractors shall fit and secure air outlets.

The sub contractor shall install the air outlets in position in accordance with the set out of the false ceiling as given by the Main Contractor.

The Main Contractor shall install ceiling tiles.

The sub contractor shall advise the Main Contractor in a timely manner the access requirements to the false ceiling for proper installation.




Adjustment of air flow rate shall be carried out from the front by key without any projecting device.

Neck sizes shall be selected based on the actual air flow rate, maintaining proper air distribution and acceptable noise levels.

Non combustible gaskets shall be provided to obviate air leeks and prevent the formation of condensation.

All internal surfaces that are visible from below shall be painted matt black.

(b) Rectangular Ceiling Supply Air Diffusers

Rectangular ceiling air diffusers shall be of the adjustable multi-blade removable louver face type with core designed to provide adequate air mixing without draught for either one, two, three, four way or circular or perforated discharge pattern. Each side of the diffuser shall supply the correct air volume for the space it serves. Ceiling outlets shall be suitable for mounting in place of ceiling tiles on ceilings suspended by exposed T-bars, and shall otherwise be suitable for surface mounting on the particular type of ceiling involved.

Diffusers shall be of aluminium construction finished in colour anodised according to the Consultant's instruction and approval.

(c) Side Blow Supply Air Grilles

Side blow supply air grilles shall be of the flange mounting type with horizontal adjustable louver blades in front of vertical louver blades, unless otherwise shown on the Drawings.

Frames and deflecting vanes shall be constructed from extruded aluminium finished in colour anodised according to the Consultant's instruction and approval.

Grille sizes specified on the Drawings are the neck sizes of the core or element, and openings for grilles shall be subject to Consultant's approval.

(d) Linear Supply Air Diffusers

Diffusers shall be constructed of extruded aluminium with fully adjustable air pattern controlling vanes for active sections and blanking panels for inactive sections. Diffusers shall be flange type.

Each length of diffuser shall be installed without any visible means of fastening and shall incorporate an aligning device to permit long lengths to be aligned neatly.

Air shall be supplied to the active lengths of each diffuser via plug in diffuser boots or plenum with spigots for round flexible duct connections. Boots or plenums shall be externally insulated. Each boot or plenum shall be fitted with butterfly dampers. Dimensions of boots or plenums shall be fitted with butterfly dampers. Dimensions of boots or plenums shall be as shown on the Drawings.

The linear diffusers shall be extruded aluminium with anodised finish to the Consultant's instruction and approval unless otherwise indicated on the Drawings.

All internal surfaces that the visible from below shall be painted matt black.




(e) Ceiling Supply Linear Bar Grilles

Ceiling supply linear bar grilles shall be of the flange mounting type with horizontal fixed blades inclined at 15o.

Frames and blades shall be of aluminium construction finished in colour anodised according to the Consultant’s instruction and approval.

Grille sizes specified on Drawings are the neck sizes of the core or element, and openings for grilles shall be subject to Consultants approval.

(f) Return Air, Exhaust Air and Transfer Air Grilles

Grilles shall consist of extruded aluminium horizontal louvers fixed securely in an aluminium frame with flanged surround. They shall be of the single louver type and shall fit tightly into the frames and unsupported blade lengths shall not exceed 300mm.

Grilles shall be completely free from rattles and vibration when the system is operating. Grilles shall be anodised finish to Consultant's instruction and approval.

Where egg crate grilles are specified on the drawings, they shall be constructed of extruded aluminium of 20mm apart at each direction and fixed to the aluminium frames. Grilles shall be anodised finish to Consultant's instruction and approval.

Where wire mesh grilles are specified on the Drawings, they shall be constructed of mild steel wire at 12mm apart at each direction and welded to each other and fixed to the mild steel frames. The grilles shall be galvanised after fabrication and painted to the Consultant's instruction and approval.

(g) Ceiling Return Air Grilles

Grilles shall consist of extruded aluminium horizontal louvers fixed securely in an aluminium frame with flanged surround. They shall be of the single louver type and shall fit tightly into the frames and unsupported blade lengths shall not exceed 300mm.

Grilles shall be completely free from rattles and vibration when the system is operating. Grilles shall be colour anodised finish to Consultant's instruction and approval.

Where wire mesh grilles are specified in the Drawings, they shall be constructed of mild steel wire at 12mm apart at each direction and welded to each other and fixed to the mild steel frames. The grilles shall be galvanised after fabrication and painted to the Consultant's instruction and approval.




6.7 THERMAL AND ACOUSTIC INSULATION

(a) External Thermal Insulation

All insulation shall comply with the requirements of the BS 476-Part 7 and FSD.

Thermal insulation shall be of semi rigid fibreglass unless specified otherwise of 48kg/m3 with thermal conductivity of not greater than 0.034 W/mK at 25oC mean temperature and shall be of specified manufacturers.

The insulation shall be with fibre reinforced double sided aluminium foil vapour barrier. The fibre reinforcing grid shall not be greater than 10mm x 10mm and water vapour permeance less than 0.3ng/Ns and puncture resistance not less than 2 Joules.

Ductwork shall be insulated from hangers and supports generally as indicated in DW/142.

Fibreglass shall be adhered to duct with fire resistant adhesive. Adhesive shall be applied so that insulation conforms to duct surfaces uniformly and firmly.

For ducts up to 450mm wide, the insulation shall be wrapped around the duct. For horizontal ducts over 450mm, metal pins shall be fixed on the bottom surface at 400mm maximum centres. Then insulation shall be wrapped around vertical ducts over 450mm, the pins shall be located on all sides of the duct at approximately 300mm centres. Protruding ends of pins shall be cut off after clips have been applied. The vapour barrier facing shall be thoroughly sealed with a vapour-barrier mastic or tape where the pins have pierced through.

All joints shall be sealed with at least 75mm wide vapour barrier tape to provide a continuous external vapour seal. Prior to the application of tape all contact surfaces of vapour barrier foil shall be wiped clean of dust and grease using cloth and suitable solvent all in accordance with the manufacturer's recommendation.

All ductwork insulation shall extend over external flanges and stiffening.

Insulation shall be applied so as to form a continuous heat and vapour barrier without gaps, cavities and openings. Care shall be exercised to ensure that the minimum thickness specified is maintained at corners, protrusions, and the like.

At the point of supports, specially prepared blocks of hardwood or Styrofoam material shall be positioned to ensure integrity of vapour barrier by bonding the supports to the insulation.

All externally insulated ductwork exposed in plant rooms and outdoor locations, and exposed to sight in other areas, shall be protected externally by means of 0.8mm galvanised steel unless otherwise shown on the Drawings with all joints lapped and secured by sheath screws at 100mm centres without any damaged to vapour barrier of the fibreglass insulation. The cladding shall be made water tight with gaskets and sealants in outdoor locations.

(b) Acoustical duct liner

Acoustic insulation shall be applied to the ductwork as indicated on the drawing.

All insulation shall comply with the requirements of the BS 476-Part 7 and FSD.

Thermal insulation shall be of semi rigid fibreglass unless specified otherwise of 64kg/m3 with thermal conductivity of not greater than 0.034 W/mK at 25oC mean temperature and shall be of specified manufacturers. Generally faced with 0.5 mm perforated galvanised steel sheet with 30% opening area. Insulation thickness shall be as indicated on the drawing

Fibreglass shall be adhered to duct with fire resistant adhesive. Adhesive shall be applied so that insulation conforms to duct surfaces uniformly and firmly.




All joints shall be sealed with at least 75mm wide vapour barrier tape to provide a continuous external vapour seal. Prior to the application of tape all contact surfaces of vapour barrier foil shall be wiped clean of dust and grease using cloth and suitable solvent all in accordance with the manufacturer's recommendation.

(c) Duct Insulation Application

Unless specified on the Drawings, all ductwork shall be insulated as external thermal insulation. Thickness of insulation shall be as follows:

Duty Location Insulation Thickness

Supply and Return Air Duct (air conditioned)

All Areas 25mm unless noted otherwise on the drawings

Outside and Ventilation Air Duct In air-conditioned:

In Void under roof

In concrete shaft

25mm

Nil

Nil

Toilet Exhaust Air Duct and Transfer Ducts

All Areas 25mm

(d) No insulation shall be applied until the duct and plant have been pressure tested as specified.

(e) All insulation shall be applied so as to give a smooth, homogeneous and line-able surface. All rigid sections shall be concentric, and accurately matched for thickness. Steps and undulations in the surfaces shall not be acceptable. Any sections or slabs having damaged ends or edges shall be rejected.

(f) All insulation shall fit tight to surfaces to be covered, and all slabs and sections shall be built up close, butting edges being mitred, chamfered or shaped as necessary. Any minor interstices left in insulation shall be filled and sealed.

(g) Insulation shall be applied to clean and dry surfaces, free of foreign material such as oil, grease, rust, scale or dirt.

All surfaces to be insulated, which show any signs of rusting or damage to galvanizing shall be thoroughly scraped and wire brushed as necessary to remove all rust, scale, and the like prior to insulation

(h) Only clean and dry insulation shall be used. Insulation shall generally be applied in accordance with the manufacturers' recommendations.

(i) The vapour barrier shall be sealed around all hangers or other projections through the insulation.

(j) Continuous insulation shall be provided through all sleeves and insulation joints shall be staggered with respect to joints on the associated ductwork system.

(k) Where ducts pass through walls and slabs, suitable fire stops insulation shall be provided for the ducts including the fire dampers. The continuity of the insulation shall be maintained throughout.




6.8 SEALING AND FLASHING

Where ducts pass through walls, floor, and the like the sub contractor shall provide sleeves of 18 gauge steel. Where sleeve are fitted through floors, they shall extend to at least 12 mm clear of finished floor.

Sleeves shall be of sufficient size to allow free movement of pipes and furthermore where ducts are insulated the sleeves shall be oversized to allow the insulation to be carried through the sleeves.

Penetrations through roofs shall also be provided with a weatherproof apron and up stand curb.

Where ducts pass through fire walls and floors slabs, a metal fire stop shall be provided around the ducts.

Where ductwork penetrates the building fabric the penetration shall be detailed as follows:

● An oversize sleeve shall be built into the construction leaving a consistent clearance of 12-15mm all round the ducts when installed. This gap shall be packed carefully with 80 kg/m3 mineral wool and the ends of this packing shall be caulked using a non-setting waterproof mastic compound giving an air tight and water tight seal.

● Where the ducts shall be thermally insulated the insulation shall terminate at both ends of the sleeve and a seal between the surface of the thermal insulation and the end of the sleeve shall be provided by the use of a single bellows arrangement using a flexible material having a minimum surface weight of 5 kg/m2.

6.9 TEST POINTS

Pitot tube openings for measuring static velocity, and total pressure for air flow shall be provided at the following locations:

● At all fans (in the straightest section of duct near to the outlet). ● At main branches after regulating dampers. ● At cooling coils (both before and after the coil).

Any other position indicated on the Drawings.

The location of these holes shall be approved by the Consultant.

On insulated ductwork, these holes shall be boxed out for the thickness of the insulation.

Test holes shall be 25mm diameter and fitted with an effective removable seal and the seals shall be properly insulated.

Pitot openings required within medium and high pressure ductwork system shall use proprietary fittings.

All pilot tube openings shall be located in the sides of straight lengths of ducts and not less than two duct diagonal dimensions (for rectangular ducts) or two duct diameters (for circular ducts) downstream and not less than one duct diagonal dimension or one duct diameter upstream of all bends, tees, transitions, and the like. The number and position of the pilot tube openings to be provided at each location shall be as follows :




(a) Circular Ducts

● For ducts up to 1200mm diameter provide two openings as perpendicular centrelines.

● For ducts above 1200mm diameter provide four openings as two sets of perpendicular centrelines. The two sets of perpendicular centrelines shall be at 45 degrees to the other.

(b) Rectangular Ducts

● For ducts having diagonal dimensions up to 450mm provide six openings, located on two perpendicular sides, three per side. Openings to be located at 1/6, 1/2 and 5/6 locations on both duct faces.

● For ducts having diagonal dimensions up to 900mm provide eight openings located on two perpendicular sides, four per side. Openings to be located at 1/8, 3/8, 5/8 and 7/8 locations on both duct faces.

● For ducts having diagonal dimensions up to 2300mm provide ten openings, located on two perpendicular sides, five per side. Openings to be located at 1/10, 3/10, 5/10, 7/10 and 9/10 locations on both duct faces.

● For ducts having diagonal dimensions exceeding 2300mm provide twelve (12) openings, located on two perpendicular sides, six per side. Openings to be located 1/12, 1/14, 5/12. 7/12, 3/4 and 11/12 locations on both duct faces.

6.10 CLEANING AND PROTECTION DURING CONSTRUCTION

All ductwork shall be fabricated undercover, delivered to site and stored in a weatherproof and dry area and covered with a plastic sheet or tarpaulin until required for installation.

Prior to and during installation ducts shall be thoroughly cleaned out and shall have all ends covered in an approved manner to prevent ingress of dust and general building debris.

Ductwork shall not be installed unless adequate cover and protection is available to protect it from possible construction damage and the elements.

Air ducts running at low levels shall have proper heavy duty metal protection to the Consultant’s approval.

6.11 LEAK TESTING

Leak testing shall be carried out by the sub contractor in accordance with the requirements stipulated in the "Commissioning, Testing, Maintenance and Services" Section of this Specification herein.




7. PIPEWORK AND FITTINGS

7.1 GENERAL

This section of the Specification covers the general requirements for pipework, valves and fittings and pipe insulation for the ventilating and air-conditioning system unless the general requirements are abrogated by specific requirements elsewhere in the Specification or Drawings.

The sub contractor shall supply and install all pipework, valves and fittings necessary for the correct and satisfactory completion, working, isolation and regulations of the piping systems covered by this Specification.

Exposed pipework shall not be permitted in occupied areas without prior approval from the Consultant.

Sizes indicated for copper and plastic pipes are nominal outside diameters, and for all other pipes are nominal inside diameters.

All pipework delivered to site shall be new and shall be colour banded to identify different grades.

Pipework shall be installed with correct falls to ensure adequate venting and draining.

All pipework shall be free from burrs, rust and scale and shall be cleaned before installation.

All open ends shall be plugged or capped to prevent ingress of dirt. On completion each system shall be flushed out with clean water.

The Drawings indicate the sizes of pipes and the manner in which the various systems are to be installed. They do not purport to show all minor pipework or bends and offsets etc. which must be co-ordinated with other trades, measured on site or ascertained from Consultant drawings showing structural, plumbing and drainage, lighting and other features normally encountered in this type of project.

Connections to equipment shall be to the recommendations of the equipment manufacturer's and to approval.

All pipework shall be installed in an approved manner to meet structural and architectural constraints and to achieve a neat and workmanlike appearance and shall be laid out with adequate provision for concrete shrinkage, expansion, contraction, grading, alignment and access for maintenance with not less than 50mm clearance between the external surfaces of pipes (including insulation where applicable) and all adjacent services and building structures. Provision shall be made for replacement of each piped service without disturbing other services.

Where two or more pipe runs follow the same route all shall be parallel to each other and to the building structure, except for the required allowance for draining and venting.

All pipework shall be provided with hangers, supports, guides, anchors and the like in accordance with BS 3974.

The procedure and the competence of the operative shall be in accordance with the recommendations contained in the following MVAC publications:

● Welding of Mild Steel Pipework ● Code of Practice - Brazing and Bronze Welding of Copper Pipework and Sheet

Where visual inspection and tests identify welding, which is nominally unacceptable, the Consultant shall be entitled to have such welding examined by radiography or other approved inspection method and independently assessed. When faulty welding is revealed, the sub contractor shall be responsible for the cost of the test and the subsequent remedial work to the satisfaction of the Consultant.




7.2 OPERATING AND TEST PRESSURES

The operating pressure of water piping systems shall equal the static head of the system plus the shut-off head of the pump (if any) connected to that system.

For operating pressures up to 2400 kPa the test pressure shall be 1.5 times the operating pressure or 2400kPa whichever is the greater. For operating pressures above 2400 kPa the test pressure shall be 1.25 times the operating pressure.

The pipework and fittings including valves and the like shall be suitable for the working pressures specified in the Schematic Drawings.

7.3 PIPEWORK MATERIALS

Pipework for the various services shall be according to the Table 1 as follow :

Pipework Class as

Services Referred to in Table 1

Chilled Water and Fresh Water Pipework I

Condensate Drain, Make-up Pipe and overflow, Drain from Feed and Expansion Tanks, Water Treatment Chemical

IV

Refrigerant Pipe V

Table 1 - Pipework Material Details

Pipework Class

Nominal Bore (mm)

Specification

I ∅15 - ∅150 Black Steel to AS 1835, AS 1836 or BS 1387, heavy grade, or to ANSI B36.10 Schedule 40

∅200 and above Black carbon steel, electric resistance welded (ERW 430)

using 430 MPa grade steel to BS 3600 and BS 3601 for ∅200 to ∅500, and manufactured by submerged arc welding for ∅600 and above

Minimum wall thickness for pipes to BS 3600/3601:

• ∅200 - ∅300 : 6.3 mm • ∅350 - ∅400 : 8.0 m

II ∅15 - ∅150 Galvanised steel tube to BS 1387, Heavy Grade

III ∅15 - ∅150 Galvanised steel tube to BS 1387, Medium Grade

IV ∅15 - ∅200 Un-plasticised P.V.C. to BS 3505-Class `D' (minimum) unless otherwise specified

V ∅15 - ∅150 Copper pipe of refrigeration quality C106 to BS 2871- Part 2 Table 2 or AS 1432 Type B. Internally degreased and cleaned. Fully annealed copper up to 18mm O.D. For 22mm to 108mm O.D. hard-drawn copper.

Alternatively Type L to ANSI B31.5

Factory tests shall be carried out to enable the quality of pipes and fittings to be controlled during manufacture. Records of these tests shall be available for inspection by the Consultant who shall have access for checking the same at any reasonable time during production and testing of the pipes. The manufacturer shall supply a certificate that the pipes comply with the requirements of the relevant British Standards or other approved equivalent such as ANSI Standards.

All pipes shall be tested for straightness, uniformity of thickness and diameter.




7.4 PIPE JOINTS, UNIONS AND FLANGES

The following methods of joining straight pipework shall be employed.

Class of Pipework Joint

I Screwed sockets for pipework up to ∅50 with jointing compounds to BS 5292 or welded joints.

Butt welded joints for pipework ∅65 and over Steam pipework shall have welded joints for all sizes

II & III Screwed sockets for pipework up to ∅50

Screwed flanges for pipework ∅65 and over to BS 4504. No welded joint is allowed

IV Solvent cement joints to BS 4346 Part I. Using Solvent cement to BS 4346 Part 3

V Brazed joints to BS 1723.

Flanged, flared (up to 20mm 0.D. only) or brazed with or without capillary fittings. Brazing shall be according to MVAC Code of Practice: "Brazing & Bronze Welding of Copper Pipe and Sheet".

Pipe unions and flanges shall be installed to facilitate the future removal of pipework in sections and where connected to fixed items of plant or valves.

Class of Pipework Joint

I Black malleable iron, bronze to iron spherical seat unions for pipework up to ∅50.

Black mild steel welding flanges to BS 4504 in accordance with the specified working pressure for pipework ∅50 and above.

Alternatively on pipework ∅100 and above Dresser Coupling shall be used where indicated on the Drawings and/or Specification

II & III Galvanised malleable iron, bronze to iron spherical seat unions for pipework up to ∅50 with jointing materials to BS 5292

For pipes of ∅65 - ∅150 galvanised malleable iron, bronze to iron spherical seat unions with jointing materials to BS 5292 or galvanised steel screwed boss flanges to BS 4504 Part 1

V As for straight pipe

All joints between adjacent sections of pipes and between pipes and pipe fittings including valves shall be carried out by tradesmen having the qualifications required by the authorities having jurisdiction over the piping system.

Puddle flanges shall be manufactured from materials and to methods described in BS4772 for ductile iron pipes and shall be cast integrally with the pipes or fittings of which they form part. The diameter and thickness of the puddle flanges shall be equal to that for BS4504 flanges for the nominal diameter of the pipes to which they are intended to be cast. Bolted-on type puddle flanges shall not be used.

Flanges shall be truly bored and welded or threaded to the tubing and faced at right angles to the axis of the bores. Flanges shall be manufactured in accordance with BS4504 and jig drilled in accordance with specified pressure rating and in no case less than PN16. Flanges shall be jointed by means of an approved jointing gasket and jointing compound, using steel nuts, bolts and lock washers of tensile strength sufficient for the particular duty involved. Bolts, nuts and washers securing galvanized flanges shall be galvanized, and those employed on flanges jointing saline water service pipes and fittings shall be stainless steel 316 unless otherwise specified.




Where pipework is connected to items of equipment having flanges of dissimilar metal to the pipework, then isolating flanges of proprietary brand shall be used with plastic bolt inserts.

Unions employing two conical bronze seats and fitted with hexagon nuts shall be employed at intervals not exceeding 15m and where required for subsequent dismantling on all pipes of ∅50 and smaller and for equipment maintenance.

No pipe joint shall be permitted within the thickness of wall or floors and the like.

Where mechanical pipe couplings are used for ductile iron pipes they shall be couplings or flange adaptors manufactured by 'Viking Johnson' or equivalent as approved by the Consultant. These couplings shall be harnessed or anchored as indicated on the Drawings.

All these couplings and bolts and locating plugs shall be with factory applied protective coating.

7.5 PIPE FITTINGS

Pipe fittings shall be as specified hereunder for the various tube materials.

Changes in direction of pipes shall be made with elbows and under no circumstance shall pipes be bent without the use of fittings.

Long sweep bends shall be used in preference to round elbows wherever practicable. Square elbows shall not be used. Tees shall be of the easy sweep or twin elbow pattern except where square tees are required for venting or draining and the like.

Eccentric reducing sockets shall be used wherever necessary to ensure proper drainage or elimination of air pockets. Reducing bushes shall not be used.

The fittings shall conform to the following standards:

Class of Pipework Fittings

I Black malleable iron screwed fittings to BS 1256, or purpose made heavy weight welding fittings to BS 1965 Part 1 for pipes up to ∅50.

Purpose made heavy weight welding fittings to BS 1965 Part 2 for pipes ∅65 and above.

Steam pipework shall have purpose made heavy weight fittings to BS 1965 for all sizes

II & III Galvanised malleable iron screwed fittings to BS 143 and BS 1256 for pipes of ∅15 - ∅150 with jointing materials to BS 5292

IV Injection moulded un-plasticised PVC fittings to BS 4346 Part 1; Solvents to BS 4346 Part 3

V Silver brazed high duty copper capillary fittings to BS 864 Part 2 for pipes to ∅54

Silver brazed gunmetal fittings for pipes of ∅67 and above




7.6 WELDING OF FERROUS PIPEWORK

Oxy-acetylene and metal arc welding of steel pipework shall be Class II to BS 4515 as appropriate.

Gas welding of steel pipework of ∅65 and above shall not be permitted unless prior permission is obtained from the Consultant.

The welding procedure and standards must be submitted for Consultant's approval before any work commences.

All personnel engaged on welding operations shall possess a certificate of competence issued by an authority approved by the Consultant. These certificates shall be produced for inspection by the Consultant before any welding is undertaken. Each weld shall be given a suitable mark in order that the operative concerned may be identified. This shall be rigidly enforced.

Butt welds shall be made using the "single V" principle where the pipe ends shall be cut square and bevelled with all internal and external burrs removed. Pipes shall be properly aligned before welding is commenced and care shall be taken during the operation that the weld does not penetrate unduly and restrict the pipe bore.

Branch welds shall be made using manufactured branch fittings accurately profiled to fit the pipes. The openings in the mains shall be correctly shaped to coincide with the branches and both pieces shall have bevelled edges. All burrs shall be removed before welding is commenced and the branch pieces shall not project into the bores of the mains.

The sub contractor shall be responsible for providing adequate staging and protection from weather to enable the welding operations to be properly performed. No welding shall be carried out:

● When surfaces of materials are wet. ● In rain or high wind. ● When the temperature of the parent metal is 5oC or below.

Because of the serious repercussions which shall result in the failure of a weld in the plant rooms and the mains distribution, the sub contractor shall be expected to diligently supervise his welding labour force.

The Consultant reserves the right to order at random the cutting out of 2% of the welded joints for inspection. Should any one of the above welds prove faulty in materials or workmanship, further removal of welds may be ordered up to a total of 4% of the welded joints. If the number of welds failing the tests within the above 4% is sufficient to suggest that an operative is not consistent in his standard, the Consultant may order any number of that operative's welds to be removed. The sub contractor shall be responsible for cutting out and repair of all such welds for inspection.

Again, because of the serious repercussions of a failed weld, in addition to the above, each weld made on pipes and fittings having a nominal diameter of 350 mm and larger a 5% sample of all welds on pipes and fittings ∅300 mm and below shall be inspected using an approved non destructive inspection process (eg. radiographic and the like). The sub contractor's attention is drawn to the magnitude of this task, the confines of the mains, and the time frame within which testing must be carried out.

Tests for each weld so tested shall be recorded and passed to the Consultant in an approved form.

Welding shall not be permitted on galvanised pipework under any circumstances.

The welding joints and the edge preparation shall be inspected by the Consultant.




7.7 WELD JOINTS ON UPVC PIPEWORK

Un-plasticised PVC pipework shall be solvent or hot air welded as recommended by the manufacturers and as detailed elsewhere in this Specification.

Where solvent welding is used, particular attention shall be paid to preparation. Abrasive paper and spirit cleaner shall be used to clean the surface. When applying solvent, heat shall be avoided in order to prevent the cement drying before the chemical bond between the two surfaces is completed. Mating surfaces shall be turned for even spread of the solvent. Excessive cement shall be wiped off quickly.

On UPVC pipework, hot air welded joints shall be made where standard fittings are unavailable and were approved by the Consultant. The welding using a jet of hot air and PVC filler rod shall only be carried out by a welder qualified in plastic fabrication. Complete fusion shall be ensured by applying from 3 to 6 runs of weld. Weld shall not be cleaned off. The sub contractor shall guarantee that any fabrication is similar in strength to manufacturer’s items.

7.8 WELD JOINTS ON COPPER PIPEWORK

Brazed joints shall be to BS 1723.

Welding rods shall be suitable for the piping materials and atmospheric conditions to BS 1845.

7.9 PIPE SUPPORTS

Pipe supports shall be provided as required for the stable and sufficient support of the pipe work. These supports shall allow free movement for expansion and contraction and shall be graded to required levels for air elimination and drainage. Spacing of supports both vertical and horizontal shall not exceed the centres given in the following table. Spacing shall be closer than specified where required by relevant standard codes or where recommended by the piping materials manufacturer.

All pipework shall be laterally restrained in a similar manner to maintain alignment under all conditions (at not greater than 6m centres).

The pipe supports also shall comply with BS3974 and the requirements stipulated in the "Noise and Vibrations" Section of this Specification herein.




All pipe supports shall not be attached to supports for equipment.

Pipework Class Nominal Bore (mm) Centres for Horizontal Supports (m)

Centres for Vertical Supports (m)

I, II, III ∅15 2.0 2.4

∅20 2.4 3.0

∅25 - ∅32 2.7 3.0

∅40 3.0 3.6

∅50 3.4 3.6

∅65 - ∅80 3.7 4.5

∅100 4.1 4.5

∅125 4.4 4.5

∅150 4.8 4.5

∅200 5.1 4.5

∅250 5.8 4.5

∅300 and above 6.1 4.5

Pipework Class Nominal Bore (mm) Horizontal / Vertical

20oC

Horizontal / Vertical

70oC

IV ∅15 - ∅20 0.9 / 2.0 0.5 / 2.0

∅25 - ∅32 1.1 / 2.0 0.7 / 2.0

∅40 - ∅80 1.4 / 2.1 0.9 / 2.1

∅100 1.9 / 2.4 1.0 / 2.4

∅150 2.1 / 2.4 1.1 / 2.4

∅200 2.4 / 2.0 1.2 / 2.0

Pipework Class Nominal Bore (mm) Centres for Horizontal Supports (m)

Centres for Vertical Supports (m)

V ∅15 - ∅20 1.4 2.0

∅28 - ∅35 1.7 2.4

∅42 - ∅67 2.0 3.0

∅76 2.4 3.6

∅108 and above 2.7 3.6

Where there are two or more sizes of pipes the common support spacing shall be based on the centres required by the smallest size of pipework.

Vertically rising pipes shall be adequately protected at the base of riser to withstand its total weight. Branches shall not be used to support the riser.

All piping supports shall be designed to take the combined loads of pipes, valves, fittings, insulation (if applicable) and fluid in the pipes and all re-actions due to thermal expansion or contraction of the piping.

All valves shall be located as close as possible to points of support and all valves in line sizes ∅200 and larger shall be separately supported.

All supports shall be capable of keeping the piping in proper alignment and shall conform with all appropriate statutory and code requirements.




All individually hung pipes shall be provided with bolted, two-piece type clamps with clevis or welded yokes. However, for pipe sizes ∅65 or less, bolted, one-piece type clamps with clevis may be used in approved locations.

All pipes to be rigidly attached to fabricated steel or masonry supports shall be clamped with full pipe clamps.

All clamps shall be rated for the full load of the pipe plus its fluid contents, insulation, flanges, valves and fittings. Where necessary, particularly in respect of hung pipes of ∅200 and larger the spacings of supports shall be reduced in order to reduce the loads to within the rated carrying capacities of the clamps.

All insulated lines on services operating at or below 100oC, shall have hardwood saddles located between the clamps and the pipes. The saddles shall consist of wedge shaped hardwood blocks arranged to form complete circular collars of the same thickness as the insulation and having lengths sized to project approximately 10mm on either side of the clamps. High temperature sectional heavy density fibreglass or mineral wool saddles shall be used for heating water and similar services operating over 100oC. Fibre glass or mineral wool saddles shall have a minimum density of 80 kg/m3.

In the case of an insulated pipe where condensation may occur on the hanger an insulating material as approved by the Consultant shall be inserted between the clamps and pipes.

All clamps and collars described above shall be firmly attached to pipework and/or insulating saddles without applying undue pressure to the pipe walls and in this connection particular care shall be taken in respect of copper piping.

Allowance for movement due to thermal expansion and contraction shall be in the method of support (e.g. hanger rods or rollers) and not between the pipe and the saddle or clamp. Vibration shall be absorbed by the use of anti-vibration hangers.

All hanger rods and associated fittings shall be hot dip galvanized steel bar of not less than the following diameter:

Pipe size (mm) Rod Diameter (mm)

Up to ∅50 (inclusive) ∅10

∅65 - ∅80 ∅12

∅100 - ∅125 ∅16

∅150 and above ∅20

Where no allowance is required for expansion, contraction or vibration, hanger rods may be fixed direct to floor slabs, structural members or to support brackets fixed to floor slabs, walls or structural members. Alternatively the pipes may be clamped directly on to support brackets fixed to floor slabs, walls or structural members.

Where two or more pipes are to be run in parallel and adjacent to each other, they shall be supported from common channel section rigid brackets or trapeze type supports fixed to floor slabs, structural members or walls as appropriate. For pipe sizes larger than ∅100 the supports shall be of standard rolled steel channel sections.

For fixings to the underside of floor slabs, channel sections with foam filled inserts or approved alternative cast into the floor slabs may be used.

All proprietary type channel sections shall be installed and used strictly in accordance with the manufacturer's recommendations particularly in respect of maximum allowable loadings and within permissible stress limitations.




Moving supports shall be provided in all cases where the pipes are subject to movement due to expansion or contraction and the supports shall be designed to allow for the maximum possible movement involved.

Where hanger rods are used to take up this movement, they shall be selected such that the ratio of the effective rod length between pivots, to the maximum movement of the pipe is not less than 6:1.

All hanger rods used for moving type supports shall be provided with "u" type brackets having over-sized holes for the rods. Similarly the clevis or welded yokes on the pipe clamps shall have oversized holes for the rods. The rods shall be secured at both ends with spherical washers and lock-nuts. Nuts shall not be used on any part of the rod between the bracket and the clevis or welded yoke.

Where the ratio of the effective rod length between pivots, to the maximum movement of the pipe exceeds 12:1, flat washers may be used instead of spherical washers.

Where sufficient rod length cannot be provided to take the maximum movement of the pipe and the movement is less than 250 from the vertical swing, spring and double deflection hangers shall be used.

Where pipe movement is extensive due to high operating temperatures, rigid channel section brackets or trapeze type supports shall be used complete with rollers or proprietary P.T.F.E. sliding pads to accommodate pipe movement.

Where roller or sliding supports are required for use with insulated pipes, the insulation shall be rigid for at least four pipe diameters and sheathing shall be of heavy gauge galvanised sheet steel forming a sleeve adequate to fully support internal pipework and to protect insulation during movements.

All pipework located in plant room and adjacent areas to occupied spaces, where vibration from equipment may be transmitted via the pipework, shall be supported from anti-vibration hangers as stipulated in the "Noise and Vibration Control" section.

Ferrous pipes shall have ferrous brackets and copper pipes shall have brass or gun metal brackets.

Additional supports shall be provided adjacent to mixing valves and the like, mounted items to prevent undue strain on adjoining pipework. Additional supports shall also be provided adjacent to pump connections and the like, to prevent undue strain on plants.

The sub contractor shall be responsible for the building in of all supports, using 'Philips Red-head Bolt', fixings for concrete, cutting away and building in of brackets in brickwork and the like. It may not be possible to fix bolts directly above the pipes to be supported and cantilever angles above the pipes channels shall be used where required.

Unless otherwise specified all supports for ferrous pipes shall be as follows:

Location Brackets, Supports and Hangers

External Locations Hot dip galvanized to BS729 and with a minimum coating of 85μm and with epoxy protective painting.

External Locations Hot-dipped galvanized air conditioned steel construction to BS729 with minimum coating of 85μm appropriately primed and painted

Painting shall be executed as stipulated in "Painting, Labelling and Finishing" Section of the Specification herein. All brackets shall be fixed by means bolts and nuts or screws electroplated with zinc or cadmium to BS3382 Part 1 and 2 of 25µm minimum plating thickness.




Vertical copper pipes shall be fixed with copper or copper alloy holders or pipe brackets of pattern approved by the Consultant. Horizontal pipes shall be fixed with heavy duty copper or copper alloy pipes brackets or hangers. The supports for horizontal pipes shall be split type pipe rings and details shall be submitted to the Consultant for approval.

All UPVC pipes supports shall be stainless steel with plastic coating.

All pipework shall be installed plumb or level unless otherwise indicated elsewhere in the Specification and Drawings, and shall be clear of all adjacent surfaces.

All pipes shall be properly and substantially supported by approved hangers, brackets, clips or supports designed to suit the requirements at each support point.

Piping shall be neatly grouped on steel framed racks arranged so that the minimum numbers of cross-overs are necessary, with adequate provision for all movement, expansion and contraction.

All non-ferrous piping and fittings shall have approved non-conductive isolation at all ferrous supports.

Capillary tubing shall be clipped to large pipes or steel battens at 450mm centres.

7.10 FLEXIBLE PIPE CONNECTIONS AND EXPANSION

The piping systems shall be installed with sufficient bends and flexibility to prevent transmission of vibration from the connected equipment to the surrounding structure, without the need for flexible connections. Where this is not possible, and in any case where the pipes are connected to equipments such as chillers, pumps and air handling units, flexible pipe connections of standard proprietary make shall be used as approved by the Consultant. These flexible connections shall be line size, made from a multi-ply nylon fabric carcase with wire reinforced collars and liners designed to suit the fluid conveyed and the working and shock pressure experienced in various systems.

The sub contractor shall supply and install stainless steel 316 expansion joints at all horizontal and vertical runs of piping of 35m to absorb the necessary thermal expansion/ contraction of the piping. The type and location of the expansion joints shall be submitted to the Consultant for endorsement prior to installation.

Where pipes pass through a building expansion joint, bellow type expansion joint shall be provided.

Suitable rigid anchors shall be provided in positions designed to correctly apportion expansion and stress. Expansion joints shall be pre-stressed for the purpose of reducing the expansion stress under working conditions, the extent of the cold draw shall be as recommended by the manufacturer.

Isolated tension member or other approved means shall be provided as necessary to prevent excessive elongation.

Anchors and guides shall be provided according to the recommendation from the manufacturer of expansion joints and flexible connections and approved by the Consultant.

7.11 THRUST BLOCKS

Anchor points shall be provided where necessary whether this is shown on the Drawings or not and shall be constructed from channel iron secured to the building structure. The sub contractor shall supply and install all cleats, brackets and steelwork required for anchor points.

Anchors shall be positioned in association with pipework change in direction to absorb the stresses due to pipework expansion and internal pressures by transmission of such forces to the ground or structure at appropriate points. Anchors shall be of an adequate strength to resist the maximum load.




Duck foot bends shall be provided for all pipe risers and pump suction/discharge risers lines.

The sub contractor shall particularly note that in addition to serving the purpose of constraining the pipeline, the anchors shall be used in connection with the testing of pipework, and at such times, it shall be necessary to have the extreme ends of the main being tested held with the anchors to prevent the pipeline drawing apart due to the thrust pressures exerted at the two ends of the pipes.

All details and sizes of thrust and anchor blocks shall be submitted to the Consultant for approval. No anchor shall be attached to any part of the building structure until full approval has been obtained for the location and method of fixing the anchors.

On steel pipes, anchors shall be fully welded to the pipes unless otherwise indicated on the Drawings.

On copper pipes the anchor shall comprise bronze flanges or clips fully brazed to the pipes and bolted to galvanise fabricated mild steel anchor plates with approved type non conductive washers and bushes to isolate the dissimilar materials and obviate electrolytic action.

The anchors shall be so designed so that all welds are in shear not bending and shall be attached to the building structure in a location and manner which shall prevent any damage to the structure to which they are attached.

No anchor point shall be within 600mm of any welded joints.

For underground pipes, all bends and tees formed with flexible joints, concrete thrust blocks shall be constructed by the Main Contractor.

In addition to the normal operating pressures of the system, these thrust blocks shall resist internal pressure caused by the closing of valves and shall be sized accordingly.

In addition to the thrust blocks specified above, anchor blocks shall be positioned at intervals on the straight length of pipework such that the distance between any thrust block or anchor block does not exceed 30m.

In this connection, the sub contractor should particularly note that in addition to serving the purpose of constraining the pipeline, the thrust blocks shall be used in connection with testing of pipework, that is to say that during testing of underground mains it will be necessary to have the extreme ends of the main being tested held with anchor blocks to prevent the pipe line drawing apart due to the thrust pressures exerted at the two ends of the pipe.

The sub contractor shall submit details and sizes of thrust on anchor blocks for approval.

7.12 GUIDES

Guides shall be of mild steel riders welded to the pipes on roller or P.T.F.E. sliding supports restrained with U-bolts on brackets or as otherwise detailed on the Drawings.

Guides shall be adjustable in both directions in the lateral plane so that the pipework can be accurately aligned.

Guides shall not be less than 2 pipe diameter long.

The first guides shall not be away from the adjacent expansion joints or flexible pipe connections by more than 4 pipe diameters. The second guides shall not be away from the first guides by more than 14 pipe diameters.

7.13 PIPELINE GRADIENTS

All water piping systems shall be installed with a continuous upward gradient in the direction of flow from the start of the horizontal run to the end of the run which shall terminate at an open expansion tank or open vessel as appropriate, or shall be arranged to be automatically air vented.




7.14 AIR VENTS

Automatic Air vent cocks of adequate size and approved by the Consultant shall be provided at all high points on water circulating pipeworks and any section in which air may collect. Vent points shall be 80mm long pipe sections with diameter 25mm smaller than the pipework above ∅80 and equal to the pipe sizes for pipes below ∅50.

Where such points are inaccessible, the air vents shall be provided with the vent pipe turned over and carried down to an accessible point terminating in a vent cock.

Each valve shall incorporate a lock shield valve and the discharge pipe shall be run to the nearest approved drain point.

Automatic air relief valves in pipes of nominal bore up to ∅400 shall be of the single orifice flanged cast iron body type with plastic float.

Automatic air relief valves in pipes of nominal bore larger than ∅400 shall be of the double orifice flanged cast iron body type with plastic float.

Automatic air relief valves shall be sized to suit the capacity of the system such that air venting is achieved in less than one hour.

All flanges shall be drilled and faced in accordance with BS 4504.

7.15 DRAIN POINTS

Adequately sized key operated drain cocks shall be provided at all low points on pipes or as shown on Drawings to enable the pipework to be completely drained.

Drain cocks shall be at least ∅20 for pipes to ∅50 and ∅32 for larger pipes, all complete with hose unions.

All drip trays under equipment in which water may collect during normal operation shall be drained to waste via piping of at least ∅25 or larger to suit particular systems. Water shall not be permitted to fall or lie on the structure of the building.

All items of equipment and ancillary items and fittings such as expansion tanks, strainers, dirt legs, and similar equipment shall be provided with draining facilities which shall run to nearest floor waste or draining position and shall be provided with screwed unions or screwed capped tees to facilitate cleaning.

Full size dirt legs fitted with gate valves and hose nipples shall be installed in all water systems. Valves shall be not less than ∅32 for pipe lines above ∅50 and not less than ∅20 for pipes less than ∅50. Dirt legs shall be located at the lowest point of all vertical runs and on coil connections to permit drainage and cleaning.

All drains and vent outlets running to waste shall be visible and run into a copper tundish so that leakage can be observed.

Gradients in all lines shall not be less than 1:500 and condensate drain pipe not be less than 1:100 and shall be arranged to drain to a minimum of low points.




7.16 VALVES

Valves shall be provided where shown on the Drawings. The valves shall comply with the appropriate standards and where applicable and bear the BS Kite mark.

Isolating valves shall be provided for all plant connections and risers to facilitate maintenance without draining the pipework.

Regulating valves shall be provided on all equipment connections to facilitate balancing.

All valves shall be suitable for the working hydraulic pressure, temperature and chemical constituency of the fluid in contact with all parts and be installed with the valve stems truly vertical or horizontal.

All valves located 2000mm or more above floor level shall have chain operating gear descending to 1000mm above floor level.

The size of all automatic valves and fittings shall be selected strictly in accordance with the manufacturer's recommendations.

All valves shall be of an approved design and manufactured in accordance with BS5150 and BS5154.

Valves for similar duties and capacities shall be interchangeable throughout the system.

All valves ∅65 bore and above shall be supplied with flanges in accordance with the appropriate table in BS 4504 Part 1.

Valves shall have open and shut indicators wherever possible and have operating handles arranged to turn clockwise for closure.

Every valve shall be cast with the following information:

● Manufacturer's name ● Hydraulic test pressure ● Size of valve

Every manual valve shall be provided with operating gear such that one man can open or close the valve against an unbalanced head 15% above that to be encountered in service. If this is unattainable in certain instances, then such valves shall be fitted with a bypass line.

The design of every valve shall be such that once fitted, it can be removed for maintenance without disturbance to pipework or damage to the valve.

Where space permits, isolating valves shall be mounted with the spindle in the horizontal plane.

Automatic valves operated by electric actuators shall have manual override by a permanently mounted hand-wheel interlocked with the starting mechanism whereby power is disconnected once manual operation can commence. It shall be possible to operate the valve by means of a switch allowing 'open' and 'close' control. The actuator unit shall also incorporate motor overload protection, local position indicator; limit switches which can be wired back to the control panel or elsewhere to give remote indication of the open/closed position. The drive motor power and mechanical gearing shall be such that the maximum closing time does not exceed 60 secs.

Automatic valves operated by pneumatic actuator shall employ spring return piston actuators arranged to close the valve on fall in pneumatic pressure. Actuators shall incorporate a valve position indicator and shall be suitable for control air pressures up to 560 kPa.

The valve covers shall be of ample size to allow clear access to the valve seats when the valve is fully open.




Check valves on pump discharges shall be installed in the horizontal plane wherever possible and be designed for fast shut-off without shocks. If of necessity, due to space limitations the valves shall be mounted in the vertical plan, the sub contractor shall conform with the agreement of the manufacturer to such an application.

All ball float valves shall be of 'Equilibrium' or equivalent pattern as approved by the Consultant, unless otherwise specified on the Drawings. Valves shall be of cast iron body with nickel alloy and stainless steel working parts, and shall be provided with tinned copper floats. Ball float valves in saline water services shall be constructed of suitable materials to Consultant's approval and shall be of the slow closing type provided with neoprene coated copper floats.

Approved pressure reducing valves, pressure relief valves, vacuum breakers, solenoid valves and motorized valves shall be provided as required whether shown on the Drawings or not.

Double Regulating Valves shall provide precise double regulation, complete with facilities for flow measurement and indication, regulation, isolation and draining. Pressure and water flow relationship at different pre-set graduation shall be available from certified flow charts, with a ± 5% accuracy across complete range. At completion of the work, one new set of flow test equipment for double regulating valves shall be handed over to the Client.

Schedule for Valves Construction:

Globe Valve and Gate Valve for size ∅12 to ∅50 for Fresh /Chilled Water Applications

Specification BS 5154

Type Inside Screw Non-Rising Stem for Gate Valves, Rising Stem for Globe Valves

Body and Bonnet Gunmetal to BS 1400 LG2, Screwed

Stem High Tensile Brass or Gunmetal

Trim Gunmetal to BS 1400 LG2

Gate Valve for size ∅65 and above for Fresh /Chilled Water Applications


Type Inside Screw Non-Rising Stem

Body and Bonnet Cast Iron (up to 16 bar), and Cast Steel (up to 40 bar), flanged

Stem High Tensile Brass / Stainless Steel

Trim Cast Iron Wedge, Bronze Trimmed

Globe Valve for size ∅65 and above for Fresh /Chilled Water Applications


Type Outside Screw Rising Stem

Body and Bonnet Cast Iron (up to 16 bar) Cast Steel (up to 40 bar)

Stem High Tensile Brass / Stainless Steel

Trim Cast Iron Disc, Bronze Trimmed




Butterfly Valve for size ∅75 and above for Fresh /Chilled Water Applications


Type Wafer body with faces compatible with the pipe line mating flanges

Body Cast Iron or Ductile Iron

Disc. Ductile Iron Epoxy Coated

Stem 316 Stainless steel

Seat Buna N (Nitrile Rubber) or EPDM

Actuator Worm Gear (for size ∅100 and above), with Handrail and Position Indicator

Note: Butterfly valves installed in insulated piping shall have extended necks to clear insulation by 25mm minimum. A flanged end short piece shall be provided to facilitate future dismantling for services

Check Valve for size ∅12 to ∅50 for Fresh /Chilled Water Applications


Type Swing

Material Gunmetal to BS 1400 LG2

Stem High tensile brass or Gunmetal

Trim Gunmetal to BS 1400 LG2

Check Valve for size ∅50 and above for Fresh /Chilled Water Applications

Specification BS 5154 Face to Face Dimensions to ISO 5752

Type Non-Slam, Spring-Loaded Check Valve Plate in Wafer Body with faces compatible with the Pipeline Mating Flanges

Body Ductile Iron Body fully encapsulated with Rubber Elastomer compressed to prevent corrosion from liquid conveyed

Disc. Plate / Shaft Ductile Iron loaded with dual springs of SS316 / SS316

Seat Buna N

Note: A flanged end short piece shall be provided to facilitate valve dismantling

Double Regulating Valve sizes up to ∅50 for Fresh /Chilled Water Applications

Specification BS 7350 and BS 5154

Type Rising Stem

Body and Bonnet Bronze, Screwed and Threaded to BS 21

Stem DZR metal

Disc Gunmetal or copper alloy

Notes:

Precise double regulation with indicator.

Pressure and water flow relationship at different preset graduation shall be read from certified flow charts. Once set, the position of the regulation shall be tamper proof.

The valves shall be complete with built-in pressure drop measuring and drain cock facilities




Double Regulating Valve sizes from ∅65 to ∅300 for Fresh /Chilled Water Applications

Specification BS 7350 and BS 5152

Type Rising Stem

Body and Bonnet Cast Iron to BS 1452 grade 220 (up to 16 bar), Flanged Ends

Disc Gunmetal or Cast Iron with Gunmetal Disk Facing Ring

Body Seat Ring Bronze or Gunmetal

Stem Brass or Aluminium Bronze

Note: The valves shall be complete with built-in pressure drop measuring and drain cock facilities

Gate and Globe Valves for Pipework Class V

Specification UPVC to BS 5156

Gate and Globe Valves for Water Treatment and Chlorination Pipework

Specification UPVC to BS 5156

7.17 FLOW METERS AND GAUGES

Flow meters, pressure gauge, thermometers and sensor pockets shall be provided as shown on the Drawings or as stipulated in this Specification for the proper commissioning of the systems. These instruments shall be suitable for the tolerance specified in the "Commissioning, Testing, Maintenance and Service" Section of this Specification herein.

Thermometer pockets suitable for either remote thermostat bulbs or mercury-in glass thermometers shall be provided where shown on the Drawings and on the inlet and the outlet of all heat transfer equipment.

Pressure gauge cocks shall be provided on the suction and discharge sides of each pump, on the inlet connection of all equipment connected to piping system, and elsewhere shown on the Drawings.

Thermometers and pressure gauges shall be of the dial face type of identical appearance having 100 mm nominal dial face, flange mounted and shall be so selected that the normal operating point or range shall be approximately at the middle of the scale range.

All gauges shall have red pointers for indication of set point or normal operating valves.

Thermometers shall be of the mercury in steel type and pressure gauges shall be of the Bourdon tube type, and shall comply with BS 1780 Part 2. Pressure gauges shall be installed with syphons tube and gauge cocks.

Where temperature and/or pressure recording is required, such instrumentation shall be accordance explicitly with requirements described elsewhere in the Specification and Drawings.

Approved meters shall be provided where required by public utilities and where shown on the plans. Such meters shall be capable of measuring the volumetric flow under all operating conditions with minimum pressure loss and in accordance with relevant British Standard.

Flow meters for volumetric flow measurement of various systems shall be mounted onto pipework in accordance with manufacturer’s recommendation so that the flow is not affected by upstream or downstream equipment operational changes. Additional flow straighteners shall be provided by the sub contractor as necessary.




Pockets for thermometers and similar purposes shall be located in positions where no adverse effects occur to flow conditions.

All pockets in steel lines shall be of the removable (screwed) stainless steel type inserted through screwed type bosses welded to the pipe.

All pockets in copper lines shall be of the fixed copper tube type with the bottom end blanked-off and the pocket brazed into the copper pipe.

Pockets shall project sufficiently far into the pipe to give a good reading and shall be complete with a minimum of 50mm depth of heat conducting fluid and shall be capped.

Pipes smaller than 65mm shall be enlarged to accommodate the pockets without loss in flow area. Pockets shall be vertical or set at an angle to retain the heat conducting fluid.

Bosses for pressure gauges and similar purposes shall be of the standard internally screwed type, welded or brazed as appropriate at right angles to the pipes and sized as required for each application. The lengths and outside diameter of pipe bosses shall be kept to a minimum consistent with pipe sizes.

All gauges on pumps and chillers, and similar equipment shall be neatly installed on pressed stainless steel sheet metal panels or solid hardwood timber panels to approval.

7.18 UNIVERSAL PRESSURE/TEMPERATURES TAPPING POINTS

Universal pressure/temperature tapping points shall be provided where shown on the Drawings.

Universal pressure/temperature tapping points shall be similar to "Pete’s Plugs" or "Twin Lock Test Plugs". The sub contractor shall provide a set of pressure/temperature gauge kit.

7.19 PIPE SLEEVES

Where pipes pass through walls, floor, and the like the sub contractor shall provide pipe sleeves. Sleeves for cast iron and steel pipes shall be steel (where the pipe is galvanised the sleeve shall also be galvanised). For plastic pipes the sleeves shall be plastic. Where sleeves are fitted through floors, they shall extend to at least 25 mm clear of general finished floor and 100mm minimum at plant room and roof locations.

Sleeves shall be of sufficient size to allow free movement of pipes and furthermore where pipes are insulated the sleeves shall be oversized to allow the insulation to be carried through the sleeves.

Penetrations through roof shall also be provided with a weatherproof apron and up stand curb.

Where pipes pass through fire walls and floors slabs, a metal fire stop shall be welded or bolted around the pipe. This shall be in the form of a 6mm (min.) thick flange located so as to occur in the centres of the slab/wall thickness and welded/screwed to the pipe, the flange being of the same diameter as the internal bore of the pipe sleeve.

Where pipework penetrates the building fabric, an oversized sleeve shall be built into the construction leaving a consistent clearance of 12-15mm all round the pipe or insulation when installed. This gap shall be packed carefully with 80 kg/m3 mineral wool and the ends of this packing shall be caulked using a non-setting waterproof mastic sealant giving a water tight-seal.




7.20 WATER STRAINER (PIPELINE)

Water strainers shall be installed in all pipelines upstream of all plant and elsewhere as indicated on the Drawings.

For fresh/chilled water strainer, pipelines of nominal bores between 15mm and 50mm inclusive strainers shall be screwed gunmetal or bronze body 'Y' type with stainless steel screen.

Pipelines of nominal bores from 65mm and above, strainers shall be flanged to BS 4504 to the appropriate Table, with 'Y' type cast iron body, brass or stainless steel screen.

The strainers shall be provided with 20mm tapped holes in cover for drain connection and shall be fitted with 20mm gate drain valves.

7.21 WATER HAMMER ARRESTOR

Water hammer arresters for use with pump discharge pipe shall be:

● Constructed entirely of non-corrosive stainless steel for use in fresh/chilled water supply system.

● Of built-in expansion bellow type and pre-charged with nitrogen and factory sealed.

7.22 PIPE CLEANING

All pipes shall be stored with closed ends, which shall not be opened until installation.

Every precaution shall be taken to clean out all piping before, during and after erection, and to prevent foreign material being left in the pipe. The sub contractor shall be responsible for any damage caused by debris in pipes.

On satisfactory completion of all pipe testing, drain, the sub contractor shall clean and fill all piping systems to Consultant's approval.

7.23 PIPEWORK INSULATION

Pipe insulation shall be rigid CFC & HCFC free, closed cell structure, phenolic foam or Ethylene Propylene Diene Monomer unless specified otherwise and shall be fully imported with the following properties:

Mechanical Properties

Minimum Density • 40 kg/m3 general • 100 kg/m3 at point of supports for pipe up to ∅125 • 120 kg/m3 at point of supports for pipe from ∅150 and above

Thermal Conductivity 0.020 W/moC at 10oC Mean Temperature

Closed Cell Content 90% minimum

Water Vapour Transmission 10μgm/Nh at 38oC, 88%RH (2 perm-inch)

Temperature Range -80oC to 120oC

Fire Properties

BS 476 Part 5 Ignitability

Class P

BS 476 Part 5 Fire Propagation

1 = 10.3, I = 4.1

BS 476 Part 7 Surface Spread

Class 1

BS 5111 Smoke Obscuration

Less than 5% (negligible)




All materials used shall be fire resistant and shall comply with the requirements of the British Standard BS 476 Part 7 and Fire Services Department.

Pipework insulation shall generally comply with BS 5970:1981.

All valves, strainers, flanges, chilled and condensate water pipes, fittings and the like shall be insulated by factory preformed phenolic foam cut to the specified thickness and to suit the outside diameters completed with 8-layers finished matt white class ‘O’ aluminium with two vapour barrier water born copolymer mastic, open mash glass re-enforcement scrim between coats (jacket of min. 60µm thick) with a 50mm overlap along the longitudinal opening joint. All overlap joints shall be sealed with adhesives. All radial butt joints between sections of insulation shall be sealed with a band of 50mm wide self adhesive matching class O aluminium foil tape to provide a continuous external vapour seal.

Preformed sectional insulation shall be secured to pipework by means of approved adhesive and as recommended by the manufacturer providing 100% coverage on the internal face and corrosion resistant metal bands not less than 20mm wide spaced at 450 mm centres, with additional bands at all points where material has been shaped.

The minimum thickness of insulation shall be as follows:

Chilled Water Pipes: • Up to ∅150: 40mm • ∅150 and above: 50mm • In Chilled Water Plant Room (all sizes): 65mm

Condensate Drain: 25mm

All pipes located in plant rooms and where exposed to weather and sight shall be enclosed in galvanised sheet cladding in addition to the vapour barrier. The cladding shall be not less than 0.8mm thick for pipework of ∅150 and above measured over the insulation and not less than 0.6mm thick on smaller pipes.

For outdoor locations, the vapour barriers shall be elastomeric polymer based vapour barriers and weatherproof coatings with reinforcing membranes between coats. The cladding also shall be made watertight with gaskets and sealants.

All insulated valves, strainers, flanges and the like shall be installed with oversized preformed sections ordered to suit the diameter of the flange or adjacent pipe installation, whichever is greater. The oversized section shall overlap on to the adjacent pipe insulation by a minimum of 75mm on each side.

Chilled water pumps shall be insulated by 65mm thick oversized preformed sections and enclosed with 1.2mm thick galvanised split boxes arranged for easy removal. The split boxes shall be arranged such that there shall be no damage to the insulation when removal of the same.

At the point of support, the insulation shall be of heavy load bearing phenolic foam of not less than 100kg/m3 for pipe sizes up to ∅125 and 125kg/m3 for pipe sizes ∅150 and above shall be positioned to ensure the integrity of the vapour barrier by bonding the supports to the insulation.

A metal spreader plate shall be situated between the insulation and the support to avoid point loading on the insulation. The spacing between the support foam sections shall be less than as follows:

• ∅15 to ∅52:

• ∅40 to ∅100:

• ∅125 and above:

3mm

4mm

6mm

No insulation shall be applied until pipes and plants have been pressed tested as specified.




All insulation shall be applied so as to give a smooth, homogeneous and lineable surface. All rigid sections shall be concentric, and accurately matched for thickness. Steps and undulations in the surfaces shall not be acceptable. Any sections or slabs having damaged ends or edges shall be rejected.

All insulation shall fit tight to surfaces to be covered, and all slabs and sections shall be built up close, butting edges being mitred, chamfered or shaped as necessary. Any minor interstices left in insulation shall be filled and sealed.

Insulation shall be applied to clean and dry surfaces, free of foreign materials such as oil, grease, rust, scale or dirt.

Any surface to be insulated, which shows any signs of rusting or damage to galvanising shall, prior to insulating, be thoroughly scraped and wire brushed as necessary to remove all rust, scale, and the like Surfaces shall then be solvent cleaned to remove all oil, grease and dirt prior to the application of a coat of primer.

Only clean and dry insulation shall be used. Insulation shall generally be applied in accordance with the manufacturers' recommendation.

The vapour barrier shall be sealed around all hangers or other projections through the insulation.

Continuous insulation shall be provided through all sleeves and insulation joints shall be staggered with respect to joints on the associated pipework systems.

7.24 AIR RELEASE AND VACUUM BREAK VALVES FOR WATER PIPELINES

The required valves shall provide any of the functions, or combinations of functions, described below.

Pipeline Filling Uninterrupted high volume air discharge through the large orifice

Pipeline Draining / Water Column Separation

Uninterrupted high volume air intake through the large orifice

Pipeline Full and Operating Discharge of disentranced pressurised air through the small orifice

Surge Alleviation Valves shall incorporate an integral "Anti-Shock" orifice mechanism which, during the pipeline filling operation and when a separated water column proceeds to rejoin, shall operate automatically to limit transient pressure rise induced by the large orifice closure to less than 2 times valve rated working pressure. The limitation of pressure rise must be achieved by deceleration of approaching water prior to valve closure

Valves shall have a large orifice diameter equal to their nominal size.

For definition purposes the large orifice shall be that through which discharge to and intake from atmosphere occurs.

No preceding or subsequent restrictions of the large orifice are acceptable, i.e., all flow through areas of the valve must be at least equivalent to the large orifice area.

When an air valve is full of water it must be hydraulically leak tight at any head between 5 metres (0.5 bar) and twice the maximum operation head of the valve.

Valves shall be protected against malfunction due to the ingress of foreign matter through the large orifice by the provision of robust, securely fastened covers and suitable perforation size mesh securely fitted into the peripheral annular space between the cover and the top of the valve.

Each air valve supplied shall have a 6mm port situated lower than the area in which pressurised air accumulates.




DN25 and DN50 valves shall have either flanged or screwed connections.

DN80, DN100, DN150 and DN200 valves shall have flanged connections.

Isolation valves integral to the air release and vacuum break valves are not acceptable.

Sluice gate valves or, alternatively any other type specified shall be used to facilitate isolation of air release and vacuum break valves from a pipeline.

Gaskets, bolts, nuts and washers for the connection of air valve to isolator valve and isolator valve to pipework shall be provided.

The valves should be of the compact single chamber design, constructed from corrosion resistant or protected component materials acceptable to the Consultant.

The control floats shall be cylindrical in shape and manufactured from solid high density polyethylene which shall not adhere to the large orifice seals even after prolonged contact.

Components shall be proportioned with regard to forces exerted upon them in the assembled valve so that no distortion or deformation occurs under normal working conditions or when the valve is subjected to a hydrostatic pressure of 2 times rated working pressure.

Valve design shall incorporate an over pressure safety feature that will fail without an explosive effect, such as is normally the case when highly compressed air is suddenly released. This feature shall consist of easily replaceable components such as gaskets, seals and the like.

The small orifice nozzle shall be manufactured from high grade stainless steel 316.

The nozzle seating edge surrounding the small orifice shall be accurately machined to form a flat land that will not abrade or cut the resilient seal against which it seats.

Damage to the small orifice resilient seal shall be prevented by a suitable feature which limits the penetration of the nozzle into the seal.

The large orifice resilient seal shall be an "O" ring retained in a dovetail groove circumferentially surrounding the large orifice.

The "O" ring shall not be bonded or adhered into the retaining groove so that ease of replacement is facilitated.

Sealing shall be affected by the flat face of the cylindrical float seating against the "O" ring seal.

A high pressure strength and leak test whereby the valve is filled with water and pressurised to twice rated working pressure which shall be held for a period of 2 minutes. Any leaking, weeping or sweating shall be reason for rejection.

A low head leak test whereby the valve is filled with water and pressurised to a maximum of 0.5 bar (50 kPa) using a visible water column connected to the test rig. The valve shall be rejected if leak tightness is not maintained for 2 minutes.

Every tenth air valve of the same size and pressure rating must be subjected to a small orifice function "drop test" whereby the valve is filled with water, pressurised to above rated working pressure and isolated from the test rig by closure of an isolating valve. A chamber in the test rig immediately prior to the isolating valve must be filled with compressed air at a pressure equal to that being maintained in the air valve. The isolating valve is then opened so as to allow the air to rise in the air valve without the pressure dropping lower than 2-3 bar (200 - 300 kPa) above rated working pressure of the air valve. The "drop test" is then carried out by slowly bleeding off the pressure through a suitable cock until rated working pressure is reached and the float drops away from the orifice to allow discharge. Failure of the air valve to function in this manner is reason for rejection.




8. WATER TREATMENT

8.1 GENERAL

The sub contractor shall engage an approved water treatment company, to treat the whole chilled water & condenser water system of the building.

The water treatment company shall make an analysis of the water systems and provide suitable water treatment programme to control corrosion, scale, algae, microbiological growth, slime and sludge in the various water circuits. The sub contractor shall be responsible to check with the Chiller Contractor whether the proposed water treatment is suitable for the chiller unit.

Selection of chemicals and associated handling and storage shall conform to the requirements of local environmental protection authorities and other authorities who have jurisdiction.

The piping systems shall initially be dosed with a suitable non-foaming detergent compound. This compound shall remove all grease and rust prior to passivating dose of water treatment inhibitor chemicals. After the pre-cleaning rinse, the entire systems shall be drained and all strainers and equipment basins cleaned.

The water system shall be given an initial dose of the chemical to bring the water to the required condition.

The sub contractor shall also be responsible for the engaging of the Water Treatment Specialist, to make monthly visits to the project during the Defects Liability Period, to adjust the system and ensure that the correct conditions are maintained. A report shall be submitted after each visit. Monthly checks shall be carried out by the water treatment company and:

● Additional dosage shall be made; and

● Bleed rate shall be adjusted to maintain the correct concentration of the water treatment chemical

The water treatment programme for the condenser water & chilled water system micro biological control shall be in accordance with Australian Standard AS 3666 - 1989.

The sub contractor shall be responsible for the supply of sufficient quantities of chemicals to adequately treat the system for the full twelve months of Defects Liability Period. He shall submit calculations showing the total quantity of the various chemicals required for 12 months of operation.

Conditions to be maintained shall be :

Item

■ pH 8 to 10

■ Turbidity (FTU scale Below 10

■ Total dissolved solids Below 1,000

■ Total hardness (as CaCO3) Below 3,000

■ P-Alkalinity (as CaCO3) Below 100

■ M-Alkalinity (as CaCO3) Below 500

■ Chloride (C1), Sulphate (SO4) Below 100

■ Ammoniacal nitrogen (NH3-N) Below 1.0

■ Iron (increment) / Copper (increment) Below 1.0 / 0.2

Total bacterial counts (npml) Below 104




8.2 CHILLED WATER & CONDENSER WATER SYSTEMS

Chilled water & Condenser water systems shall be protected by a corrosion inhibitor introduced into the system via a slug dosing assembly which shall include an adequately sized rigid PVC tank with lid and duplicate (one as standby) chemical injection pump with adjustable output to provide proportional addition of chemical under a timer control. Header tanks shall be drained, cleaned and refilled every six months.

(a) Tanks

The sub contractor shall supply and install onto a base provided by the Main Contractor, one number of ultra violet resistant round moulded fibreglass or polyethylene chemical mixing tanks (or equal) and approved of not less than 180 litres capacity for chilled water system or for tens days continuous use (whichever is greater).

The tank shall be complete with cover of high rigidity fibreglass or polyethylene having suitable moulded recessed or other approved arrangements to support mountings of metering pump, and liquid level controller switch.

The tank shall be graduated in 10 litre steps.

The tank shall be suitable for mixing the chemicals specified and, although normally operated at approx. ambient plant room temperature, they shall nevertheless be suitable for solutions at temperatures of up to 400C.

Tank shall have a strong flat bottom providing adequate support when full such that the outer perimeter of the tank shall not be forced up by water pressure causing the bottom to bulge complete with pump supports, drains and manual stirrer.

(b) Chemical Metering Pumps

In conjunction with the chemical tank, the sub contractor shall provide panel or tank top mounted high efficiency metering pumps (duplicate per tank with one standby). Chemical pumps should have on-off switch and protection fuse.

The pumps shall be of positive displacement suitable for 100: 1 output range facilitate by means of independently variable stroke length and stroke frequency providing fully adjustable output capacity over the operating range. The operating range shall be with a capacity 120% that required to meet the specified requirement.

Pumps housings shall be of corrosion resistant glass reinforced polypropylene and all electrical/electronics components are to be encapsulated. If necessary, anti-syphons/pressure release valve mechanisms shall be proved to ensure anti-siphons protection plus priming ease, even under pressure.

The pumps shall have an acrylic moulded head, PVC/polypropylene fittings, ceramic valve balls, Teflon seal rings and Liquifilm face, spring anti-siphons mechanism. The discharge tubes shall be of adequate size and of suitable PVC materials to transport the solutions involved.

The pump suctions shall be mounted into the tank using a PVC suction tube assembly with foot valve and strainer.

(c) Execution

Unless otherwise specified, make up water supply to the chemical tank shall take the form of 18mm bib tap situated over each chemical tank. The sub contractor shall provide a suitable supply to these bib taps with pipework securely fixed to the walls. A 25mm mains valved supply will be provided within a 30 metres pipe run of the tank. The sub contractor shall also supply suitable lengths of chemical resistant flexible hose from bib taps to tanks to facilitate the filling operation.




In order to prevent the metering pump from running should the mixing tank become empty, the sub contractor shall provide and install into tank cover a suitable liquid level switch.

This shall be suitable for the combined current of the pump and must interrupt the power supply to both through direct switching or by relay.

The level switch shall be contained in a corrosion resistant assembly of glass reinforced polypropylene. It shall have PVC float tube, foamed polypropylene float and encapsulate reed switch.

In each case, there shall be a float protector to prevent false actuation due to turbulence etc. A low voltage 12 volts transformer is to be incorporated to provide the supply the to reed switch for safety.

The liquid level switch casing shall be manufactured from non ferrous metal or otherwise be protected against corrosion.

The chemical storage tank shall be supported 300mm above floor level on corrosion resistant steel framework.

The system shall be flushed out using an appropriate chemical dispersant of a type and strength recommended by a reputable chemical water treatment manufacture and guaranteed in writing by that company as suitable in every respect for the application.

The chemicals shall remain in the system for prolonged hours with the pumped circulation in operation, as recommended by supplier with free technical support accepted by the Consultant.

The system shall then be drained and flushed until tests at all drain points show that traces of suspended matter have been substantially removed to the Consultant approval.

The success or failure of the above operation will depend on a high speed rate of draining down which is entirely related to the size of the drain points and ability of air to enter the system from the top.

For high speed draining down purposes the sub contractor shall provide temporary 50mm valved drain outlets on all points where the main pipework is 50mm or over.

The sub contractor shall ascertain that there is adequate drainage nearby to discharge to by large hose in order to ensure flooding of low level areas does not occur.

Subsequent to the flushing out operations the large drain down points shall be reduced to 15mm valves or cocks or the sizes as indicated on the Contract drawings.

Chemical dosing pipework shall be installed in accordance with the “Pipework and Fittings” section of this Specification and all materials shall in all cases be suitable for circulating the chemical used.

Test kits shall be supplied under this Contract with log book and operation instructions showing frequency of dosing and testing, and the levels of the PH, inhibitor concentration and total dissolved solids etc.

The chemical pumps shall have flow switches to initiate an alarm to MVAC switchboards or BMS (if applicable) and auto change to standby pumps when the duty pump fails to operate upon time control.

The tank also shall have level controller to initiate high-low level alarm to MVAC switchboard or BMS (if applicable)




9. ELECTRICAL

9.1 GENERAL

(a) Standards

The whole of the electrical works shall be carried out in accordance with AS3000 SAA Wiring Rules.

(b) Load Balancing

Loads shall be balanced as evenly as possible across all three phases.

9.2 MECHANICAL SERVICES SWITCHBOARDS (MSSB)

Mechanical Services Switchboard will be provided by the Electrical Sub Contractor. The MVAC sub contractor shall ensure the below specified items are provided to complete the operational and functional mechanical services switchboard.

(a) General

Mechanical services switchboard shall be provided in each plantroom or where indicated on the drawings or directed on site.

All switchboards shall be Form 1.

The fault level RMS for the switchboards shall be obtained from the Electrical Sub Contractor.

All electrical central panels shall be a dead front, totally enclosed, front connected cubicle constructed to conform with the requirements of AS1136.

Each panel shall be sized to suit its purpose and location. Adequate space in accordance with AS3000 shall be provided for all specified equipment, incoming and outgoing cables and their terminations and access for installation and future maintenance.

Equipment shall be mounted in the panel in such a way that any item can be removed without disturbing any other item.

Equipment which must be accessible for operating the mechanical services such as selector switches and indicator lights shall be mounted on a hinged from panel of the cubicle.

Indication and control items to be provided on each switchboard includes, run and fault lights for each drive, volmeter and selector switch, timeclock override switches, lamp test switch.

Access to the remaining equipment within the cubicle shall be by hinged doors.

(b) Construction

Cubicles shall be welded construction, fabricated from sheet steel not less than 1.6mm thick, with sheets bent to minimise the number of welded joints and provide sufficient rigidity with or without the doors fitted.

Doors shall be fabricated from sheet steel not less than 1.6mm thick, folded and braced for sufficient rigidity to prevent excessive warping and flexing.

Doors shall be straight and flat without distortion. Edges shall be rounded with no sharp or irregular projection.

Doors shall be hung to the cubicle by chrome plated lift off hinges.

Doors shall be fitted with lockable chrome plated handles or other approved means of fastening.




Doors with diagonal dimension greater than 1000mm shall also be fitted with locking bars and guides.

The edges of doors shall be fitted with compression gaskets.

Doors shall be capable of being removed individually without disturbing other doors.

Earth continuity shall be provided throughout the cubicle including covers and doors by use of serrated star washers under nuts and bolt heads or other approved means.

(c) Finish

Unless otherwise specified the requirements for cubicle finish apply to exterior and interior surfaces.

After construction of the switchboard cubicles, covers and doors all welds shall be ground smooth and the whole switchboard shall be cleaned of slag, rust and grease prior to etch priming.

One coat of each primer having a suitable corrosion inhibiting compound shall be applied.

An undercoat shall be applied as a base for final coats unless otherwise recommended by the paint manufacturer.

At least two final full gloss coats of baked enamel, or paint of equal finish and hardness, shall be applied.

(d) Busbars And Connections

Within the cubicle busbars shall be the preferred method of connection on the line side of the protective devices for each circuit. Multipole proprietary busbar assemblies shall be used where possible.

Busbars shall be rated to carry the maximum loads of all equipment served with a maximum temperature rise in accordance with AS1136.

Busbars and busbar supports shall be designed to withstand the forces generated by the specified prospective fault currents.

Busbars shall be identified by coloured sleeving or by 25mm wide colour bands at 500mm centres with at least one colour band for each busbar section. The colours shall indicate the phases, neutral and earth.

Cable connections may be used within the control panel. Cables shall comply with AS3147 and shall be sized to limit maximum temperature, when all equipment is at full load, to the rating of the cable insulation. Cables shall be rated and fixed to withstand the prospective fault level without damage.

Neutral and earth busbars or links shall be provided with sufficient separate ways for connection of all incoming and outgoing neutral and earth conductors.

(e) Cable Terminations

The cubicle shall be provided with adequate cable entry facilities comprising entry slots fitted with removable cover plates, conduit knockouts or glands. Brass gland plates shall be provided for termination of M.I.M.S. cable.

Suitable supports such as ducts, trays or support straps shall be provided within the control panel for all incoming and outgoing cables.

Incoming and outgoing cables, whether power or control, shall be terminated in the fixed portions of the control panel, not on hinged panels.




Power cables may be terminated directly on the terminals of switchgear and starters.

Control wiring shall be terminated on a numbered terminal strip. Internal connections shall be provided between the terminal strip and equipment.

(f) Control Wiring

Control wiring shall comply with the requirements of AS3147. The conductors size shall be minimum 7/0.5mm or 30/0.24mm. Conductors shall be insulated with minimum 250 Volt, V75 grade PVC. Conductors which are run unprotected in busbar chambers shall be double insulated.

The insulation and/or sheath of control wires shall be of one colour through the control panel and the colour shall be distinct from that of any power wiring.

Control wires shall be identified by means of moulded ferrules or sleeves at both ends. The ferrules or sleeves shall be of insulating materials which, except where otherwise specified, are to be white with black lettering and are to have a glossy finish.

Control wiring shall be run separately from power circuit wiring.

Wires shall not be jointed or tee'd between terminals.

Each wire shall be separately terminated with tinned (but not soldered) crimped lugs of approved type suitable for the terminals and wire used.

Conductor terminations need not be provided where insertion or tunnel type terminals are used. Terminal studs or blocks shall be adequately rated for the duty. Terminal blocks of the insertion or tunnel type shall incorporate captive pinching screws and serrated clamping plates with an inherent locking feature. Screws shall not bear on wires. Terminals shall be identified using an approved marking and numbering system.

An allowance shall be made on the length of each wire at the point of connection to a terminal for the remaking of the termination at least once without the need to disturb the main run of the wire.

Unless otherwise approved only one wire shall be connected to each terminal of insertion or tunnel type blocks.

Control wiring shall be laced and formed into looms supported on approved wiring cleats. Alternatively wiring may be run in insulated ducts.

9.3 ELECTRICAL CONTROL PANEL COMPONENTS

(a) General

Components of the one type, e.g. contactors, shall be of the same manufacture throughout the installation.

(b) Isolating Switches

Isolating switches including control panel main isolators shall comply with AS1775 and be suitable for fault making/load breaking duty.

Utilisation category shall be AC-23.

(c) Circuit Breakers

Circuit breakers shall be of the moulded case type complying with AS3111 or AS2184 depending on load and fault current rating.

The trip current rating shall be clearly marked on the circuit breakers and be clearly visible when the circuit breakers are installed in the control panel.




Identification of the contact positions shall be clearly marked on circuit breakers in a contrasting colour.

(d) Fuses

Fuses shall be H.R.C. cartridge type complying with AS2005.

Fuses shall be mounted in moulded carriers with shrouded controls similar to G.E.C. Red Spot.

Fuses shall not require a special tool for withdrawal or insertion.

(e) Contactors And Motor Starters

Contactors shall be of the block style, electromagnetic air break type complying with AS1029.

Motor starters shall comply with AS1202.

Contactors including those which form parts of motor starters, shall have the following features:

● Rated duty, intermittent, Class 0.3 ● Utilisation category, AC-3 ● Mechanical endurance, Class 10 ● Contact life, 1 million operations at AC-3 ● Quiet in operation ● Series or parallel contacts shall not be used to achieve ratings.

Motor starters shall be direct on line type with overload protection in each phase of the supply unless specified otherwise or required by the Supply Authority.

(f) Control Switching Devices

Control switching devices, e.g. instantaneous relays, time delay relays, control switches and push button switches, shall comply with AS1431.

Relays shall be of the plug-in type with a minimum of six (6) contacts rated at 5 Amps for inductive loads.

Relay coils shall be capable of operating under the required duty in the surrounding ambient conditions with a supply voltage variation of +10% to -20%.

Control switches shall be of the rotary cam operated type with double break contacts with a minimum current rating of 6 Amps at 220 Volts A.C. to utilisation category AC-11.

Pushbuttons shall be oil tight type with minimum current rating of 6 Amps at 220 Volts A.C. to utilisation category AC-11. Buttons shall be not less than 22 mm diameter.

(g) Indicator Lights

Indicator lights shall be of the oil tight type with heat resistant plastic or glass lens, minimum 22 mm diameter.

Lamps shall be incandescent type, maximum 24 Volts, rated between 2 and 6 Watts.

Lamps shall be capable of being changed from the front of the control panel and the lampholder shall remain rigidly fixed to the panel during lamp changing.




(h) Labelling

Every control panel and every item of equipment on or in the control panel shall be clearly and accurately labelled for identification and in the case of switches, pushbuttons, etc. to indicate the function, direction of operation, etc. as appropriate.

Minimum size of lettering shall be 3 mm; larger sizes shall be used where appropriate. Lettering shall be of a contrasting colour to its background. Engraved lettering shall be black on white except in the case of main switch labels which shall have red lettering on white background.

9.4 ELECTRICAL INSTALLATION

(a) General

Unless specified otherwise wiring shall generally be run in PVC/PVC cables concealed wherever possible in ceiling spaces, wall and partition cavities, etc. Certain wiring is required to be in MIMS in accordance with AS1668.

When wiring is unavoidably exposed in occupied areas, wherever it is required to have mechanical protection and where it is chased into masonry, it shall be run in conduit.

Wiring associated with the mechanical services shall not be grouped together with nor run in the same duct, tray or loom with other electrical and communication wiring in the premises.

(b) Conduits, Ducts And Cable Trays

Conduits shall be Class B rigid PVC to AS2053 or screwed galvanised steel to AS2052.

Conduits shall generally be run wherever possible by casting into slabs, columns, etc. by running in wall cavities, ceiling spaces etc. or by chasing into masonry and in accordance with any details shown on the drawings.

Where conduits and ducts are run on the surface, they shall be neatly run parallel or perpendicular to building elements and where more than one conduits follows approximately the same route they shall be grouped together.

Where conduit runs exceed 12 m draw-in boxes shall be provided at intervals not greater than 12m.

All conduits and ducts must be in position and securely installed before any wiring is drawn-in.

Exposed conduits shall be fixed at not greater than 600 mm centres.

Flexible conduits shall be used for final connections to motors and appliances.

Where cable trays and ducts are suspended below a roof, slab or ceiling single sided brackets shall be used to facilitate installation and removal of cables.

Generally trays, ducts, brackets, bracket spacing and method of fixing shall be such as to give adequate strength and rigidity.

Fixings for ducts, hangers or brackets shall be approved metal expansions devices, installed in strict accordance with the manufacturer's recommendation. Wooden, fibre or plastic plugs will not be permitted.

Explosive type fixings of the powder-powered type will not be permitted.




(c) Wiring Materials

Wires and cables shall be of specified manufacture as indicated the Schedule of Technical Data, type V75 PVC insulated, 660 Volt grate with copper conductors complying with AS3147.

Wires and cables shall be new and delivered to site in their original packages.

Where double insulation is required wires shall be PVC insulated and PVC sheathed.

Minimum size conductor shall be 2.5mm² for all cables.

Flexible conductors shall be not less than 24/0.2mm.

(d) Wiring Installation

Where large numbers of wires are running together, as where wiring emerges from a control panel they shall be run in duct or on cable tray.

All wiring shall be withdrawable. Therefore wires shall not be cast direct into concrete, cement render, plastic or the like.

The whole of the wiring shall be carried out on the loop-in system.

Above accessible and removable tile type ceilings TPS wiring shall be fixed at not less than 1200mm intervals to the slab or roof structure above. Alternatively, it may be suspended on a catenary system. In either case no wiring shall be permitted to lie on top of ceiling tiles, luminaires and other items in ceiling.




10. PAINTING, LABELLING AND FINISHING

10.1 MATERIALS

All parts of the work installed under this Specification shall be painted with approved first quality enamel paints of quality, colours, and brands as approved by the Consultant, except those items specified as being painted by others or otherwise exempted from painting in this section of the Specification.

The requirement for painting of all pipework and ductwork is in addition to the colour coding or banding specified in this Specification.

Paint shall be selected to withstand the temperature on the surface which it is applied, and shall be suitable in all respects for the environmental conditions in which it shall be located.

All paint used shall be of one manufacture as approved by the Consultant, and finishes shall be full gloss unless otherwise instructed by the Consultant.

All painting for outdoor installation which is subject to corrosion effects shall be epoxy paint.

Before ordering any primer, undercoat and finishing paint, The sub contractor shall propose the colour scheme to the satisfaction of the Consultant.

10.2 PLANT, MACHINERY & EQUIPMENT

All items of plant, machinery and equipment supplied painted ex factory shall be given one finishing coat of full gloss enamel using colour and brand as approved by the Consultant, except where the manufacturer's standard finish has been approved by the Consultant.

10.3 EXPOSED METALWORK

All exposed metalwork shall be wire-brushed and cleaned from rust, scale, dirt and grease, and shall then be given one priming coat, one undercoat and one finishing coat of full gloss enamel to colour as approved by the Consultant.

The priming coat for exposed galvanised iron shall be an approved galvanized iron primer as approved by the Consultant.

The priming coat for exposed non-ferrous metalwork shall be suitable for the metal to which it shall be applied and shall be to the approval of the Consultant.

10.4 CONCEALED METALWORK

All galvanized iron surface concealed in roof spaces, false ceilings, building ducts and the like shall not be painted.

All black iron and steel surface shall be wire brushed and given one coat of approved primer.

10.5 PLASTERED FINISH INSULATION

Plastered finish insulation surfaces shall be given one coat of size, one undercoat consisting of two parts of ordinary undercoat to one part of sealer, and one finishing coat of full gloss enamel.




10.6 PIPEWORK AND METAL SHEATHING

Pipework and metal sheathing shall be painted as for exposed or concealed metalwork as applicable.

Turned parts of valves, controls and the like shall be cleaned and polished to the approval of the Consultant.

10.7 PIPEWORK IDENTIFICATION

All pipes and the like shall be identified in accordance with BS 1710

Circumferential bands of standard ground colours shall be not less than 100mm wide on pipes up to 50mm nominal diameter, and not less than 150mm wide on pipes greater than 50mm nominal diameter.

Supplementary colours shall be displayed as bands not less than 25mm wide in the centre of the ground colour bands.

Where lettering is required it shall be painted in contrasting colours in accordance with the standard, in block letters not less than 15mm high for pipes up to 50mm nominal diameter, and in block letter not less than 40mm high for larger pipes.

Identification bands shall be located where they are clearly visible in each room or compartment through which the pipe runs, and shall be placed at centres not exceeding 6m all to details as approved by the Consultant.

Direction of flow shall be indicated by an arrow painted on the pipe adjacent to each colour band. Arrows shall be 75mm long on pipes up to 50mm nominal diameter, and 150mm long on larger pipes.

10.8 DUCTWORK IDENTIFICATION

All air ducts, and the like shall be indicated by colour panels of not less than 100mm wide on air ducts of all sizes.

● Supply air duct Blue ● Return air duct Green ● Fresh air duct Red ● General exhaust air duct Grey ● Toilet exhaust air duct Brown

Where lettering is required it shall be painted in contracting colours, in block letters not less than 80mm high.

Identification bands shall be located where they are clearly visible in each room or compartment through which the pipe runs, and shall be placed at centre not exceeding 6m.

Direction of flow shall be indicated by an arrow painted on the air duct adjacent to each colour band. Arrows shall be 150mm long.




10.9 COLOUR SCHEMES

The whole of the installation shall be painted in accordance with the following schedule

Pipeworks

● Identification BS 1710 ● Colour coding BS 4800

Colour coding

Item Colour No.

Switchboards and Control Panels Grey or as directed by Consultant -

Electric Motors Primrose 310

Electrical Conduits / Lights Orange 557

Pumps and Tanks As for respective piping services -

Air duct White -

All other equipment As directed by Consultant

10.10 LABELLING

All plant and equipment provided under this Specification shall be labelled in English and Vietnamese language as to duty or services, all such labelling to correspond to schedules, diagrams, and the like to be provided as part of the as installed Drawings. Labels shall be of white Traffolyte with black engraved lettering not less than 20mm high or as otherwise required and approved. Labelling shall also be required at the Mimic Diagram.

Manufacturers' nameplate shall generally be provided for all plant and equipment and shall show serial and model numbers and date of manufacture.

The following refers to specific items (but not by way of limitation) requiring labelling:

● All valves, motor starters, fans, distribution boards, gauges, contactors, cable terminals in switchboards, circuit breakers.

● Labels to be attached to valves (or pipe adjacent thereto) with a light gauge metal band or alternatively to be screwed to the insulated valve box where provided. These labels shall state the valve number.

● Distribution boards, starters and the like shall be labelled to indicate the circuit number, phase and item controlled.

Labels shall be screwed or riveted to sheet metal. Adhesive fixing is not acceptable.

Details of exact lettering shall be agreed with the Consultant prior to manufacture.




10.11 APPLICATION OF PAINTING

All paints shall be prepared and applied in accordance with the manufacturer's recommendations.

All galvanized metal surfaces shall be properly etch-primed to ensure correct adhesion of the paint to the surface. Material shall be as recommended by the paint manufacturers. Subsequent painting of galvanized surfaces shall comply with this Specification.

Prior to painting, all metallic surfaces except galvanized surfaces shall be thoroughly scraped and wire brushed as necessary to remove scale, rust and swarf. Surfaces shall then be solvent cleaned to remove all oil, grease and dirt.

When the surfaces to be painted are clean and dry, one coat of an approved primer shall be evenly applied over the entire area. After surfaces have been primed, the sub contractor shall notify the Consultant so that an inspection of the primed surfaces can be made prior to the application of the undercoat and the finishing coats.

When the priming coat has been approved, one coat of undercoat shall be applied as approved by the Consultant. Before applying the finishing coats, the sub contractor shall ensure that the undercoated surface is rubbed flat and smooth. Finally, an two coats of high gloss finishing paint shall be applied when all dust has been removed as approved by the Consultant.

Each successive coating shall be completely dry prior to the application of the next coat. The minimum thickness of each layer of paint shall be 50 µm.




11. TESTING, BALANCING & COMMISSIONING

11.1 GENERAL

Prior to delivery from the factory and shipment to site, the sub contractor shall submit test certificates issued by the manufacturer for the MVAC equipment to be used for this project (including type test certificates). On completion of the works, the sub contractor shall commission the MVAC installation and put them into operation in accordance with the Specification.

After commissioning and prior to Practical Completion , the sub contractor shall provide all necessary facilities and instruments to carry out all tests as defined within the Specification to satisfy the Consultant that the installation meets the requirements of the Specification.

The sub contractor shall ensure that there are sufficient facilities included in the air and water distribution systems to carry out an effective and comprehensive testing and commissioning exercise.

During the Defects Liability Period, the sub contractor shall carry out a regular comprehensive preventive maintenance service as well as breakdown service as specified later in this section of the Specification.

In addition, the sub contractor shall liaise with the other Contractors for the installation work and to carry out all adjustment necessary for the safe, reliable and satisfactory operation of all the equipment supplied under this Contract. Such adjustment shall be carried out after all control systems have been installed and tested.

The sub contractor's commissioning personnel must be experienced and trained. Qualifications of the commissioning personnel shall be submitted to the Consultant for approval.

11.2 SUPERVISION BY ENGINEER FROM THE MANUFACTURER

The following shall be tested and commissioned in the presence of Commissioning Engineers from the manufacturers.

● Control system installation ● Water treatment installation ● Chiller installation

11.3 ACCEPTANCE PROCEDURE

At least one month before the Date of Completion of the Contract works, the sub contractor shall notify the Consultant in writing through the Main Contractor of the name of the sub contractor's Commissioning Engineer, who shall co-ordinate all testing, inspections and final works to the approval of the Consultant. The sub contractor shall also submit in writing all the testing and commissioning procedures for the Consultant's approval. Testing shall be executed according to requirements stipulated in other sections of this Specification.

Unless otherwise approved in writing by the Consultant, a period not exceeding two weeks shall be allowed for all commissioning adjustments which must be completed prior to the Date of Completion of the Contract works.

The sub contractor shall within one month after the Date of Completion of the Contract works, carry out all outstanding items and rectify minor defects as instructed by the Consultant.




11.4 EQUIPMENT FOR TESTING AND COMMISSIONING

All equipment required for the commissioning and testing of the Works shall be provided by the sub contractor.

This equipment shall include:

● Octave band sound meter ● Vibration meter ● Sling psychrometer ● Tachometer ● Mercury in glass thermometers ● Pitot tube and inclined gauge manometer ● Water flow test set for flow meter and double regulation valves ● Electronic rotating vane anemometer ● Velocimeter ● Insulation megger ● Ammeter ● Voltmeter ● Cable test kit ● Thermo-hygrograph ● A discharge funnel or hood for measurement of air flow for light troffer or linear

diffusers ● Water treatment test kit

All instruments shall have been recalibrated within six months of the start of commissioning or testing.

Calibration of all instruments shall be certified by the instrument manufacturer or a calibration agency approved by the Consultant.




11.5 TESTING DURING ERECTION

Where specified in the relevant section, plant shall be pressure tested at the manufacturer's works to a minimum of 1-1/2 times the working pressure (or as specified in the schedule) for a period of not less than two hours. Test certificates in triplicate shall be forwarded to the Consultant.

Prior to application of insulation and painting all water pipework shall be hydraulically pressure tested to 1-1/2 times the maximum working pressure in the system for not less than 24 hours without leakage or loss of pressure. The maximum working pressure shall be deemed to be the static head plus the total pump head. The minimum test pressure for water pipes is 16 bar.

The pressure test shall be carried out in different sections of the hydraulic systems in such zoning approved by the Consultant. The test of the whole system shall be considered as final.

Where any plant shall not accept the maximum pipework test pressure it shall be isolated during the pipework tests, then that section of pipework and plant shall be retested at the equipment test pressure.

In sections of pipework with expansion joints, care shall be taken not to exceed the design anchor load. The joints shall either be rigidly tied or removed for the hydraulic test and replaced by a spacer piece. When the expansion joint is reintroduced, that section of pipework shall be retested at the system working pressure.

No pressure tests are required for low velocity or low pressure ductwork (unless otherwise indicated) but all such systems shall be visually inspected for air tightness in the presence of the Consultant.

All ductwork shall be tested by handfeel and audio checking of all joints and the sub contractor shall seal all leaks with a sealing compound approved by the Consultant.

High and medium velocity systems shall be pressure tested for air leakage as recommended by the Heating and Ventilating Contractors' Association Ductwork Specification DW/143.

All open top cisterns, including cold water storage tanks, shall be subjected to a standing leak test for twenty four hours.

Refrigerant piping circuit shall be pressure tested to 3000 kPa for 24 hours, using dry nitrogen or anhydrous carbon dioxide. Pressure test shall be carried out with compressors discharge and suction services valves closed. The pressure test shall be immediately followed by evacuation simultaneously from both sides of the systems to an absolute pressure of 3mm of mercury (i.e. the boiling point of water in the system is below 0°C) with compressors service valves open and vacuum pump running. The compressor service valves shall then be closed, and the vacuum pump isolated from the system. The evacuation test shall be deemed satisfactory if the absolute pressure rise over twelve hours does not exceed 4mm of mercury electronic vacuum indicator.

Each plate type heat exchanger shall be hydraulically tested to 1.5 times the working pressure rating specified. The test shall be carried out with one side of the plate filled with water at atmospheric pressure and the other side shall be built up with a test pressure maintained for at least 30 minutes.




11.6 PRELIMINARY COMMISSIONING AND PRETREATMENT

The sub contractor shall ensure that all equipment included under this Contract is thoroughly cleaned, lubricated and checked for serviceability immediately before setting to work.

Particular attention is drawn to the removal of building debris from the air systems, motors, fan bearings and pipework and subsequent cleaning to the satisfaction of the Consultant.

Prior to start-up and after satisfactory hydraulic testing, The sub contractor shall clean out the entire installation and keep them in a new condition. All piping systems shall be flushed and drained at least once through to draw off contaminating materials. All pipes shall be rodded when necessary to ensure clearance of debris, cleaning and flushing shall be carried out in sections as the installation becomes completed.

All strainers shall be inspected and cleaned out or replaced.

When the entire systems are reasonably clean, a pretreatment chemical shall be introduced and circulated for at least 8 hours. Warning signs shall be provided at all outlets during pretreatment. The pretreatment chemical shall:

● Remove oil, grease and foreign residue from the pipework and fittings. ● Pre-condition the metal surfaces to resist reaction with water or air. ● Establish an initial protective film.

During all preliminary flushing, plant shall be isolated by means of by passes to avoid deadlegs, and the systems shall be completely isolated from any existing systems to ensure contamination cannot occur.

Further flushing and chemical treatment shall be carried out on isolated systems by connection of temporary diesel driven pump to circulate water and dosing chemical. The sub contractor shall allow for cross-connection of flow and return pipework at the extremities of risers and interface points with existing installations or other Contracts.

After pretreatment, the system shall be drained and refilled with fresh/chilled water and left until the system is put into operation.

Details and procedures of the pretreatment shall be submitted to the Consultant for approval.

The air handling equipment shall be operated to remove building debris from ductwork, and the sub contractor shall thoroughly clean out all air handling units, filter chambers and air chambers.

During initial testing and cleaning of air handing equipment, temporary filter media shall be provided to clean air entering fans and coils.

All automatic controls and safety devices shall be inspected and checked for serviceability before the working fluid or electricity is applied to the system.




11.7 FACTORY TESTS

Factory tests shall be conducted on the following equipment by the sub contractor at the manufacturer’s works or elsewhere as appropriate.

The sub contractor shall notify the Consultant at least 4 weeks prior to the dates of factory tests. The sub contractor shall also provide all necessary transportation and accommodation (if required) for at least two representatives of the Owner/Principal and two representatives of the Consultant to attend and witness the factory tests. Within 2 weeks after satisfactory completion of the factory tests, three sets of the test reports (duly signed by the testing institute and the witnesses) shall be submitted to the Consultant for approval.

The following items of equipment shall be tested at the manufacturer's works or elsewhere as appropriate.

(a) Fans

'Type-test' for fan characteristic curves, (BS 848 Part 1, test method as appropriate) and type test certificate for sound power levels (BS 848 Part 2)

(b) Pumps

'Type-test' for head discharge, speed and power input (BS 599). For pumps with motor of 40kw and above, factory test for one of each type of pumps shall be required for specified performance.

(c) Electric Motors

'Type-test' in accordance with BS 5000. For motors of 40 kW output and above, factory test in accordance with BS 5000 for one of each type of motor shall be required for specified performance.

(d) Starters and Control Gear

'Type-test' (BS 587) for control panels as a whole, routine (individual) high voltage test in accordance with BS 587.

(e) Mechanical Services Switch Board (MSSB)

The following factory tests shall be performed in the presence of the Consultant.

● Inspection of switchboard including wiring, electrical and mechanical connections

● Mechanical tests ● Primary and secondary injection tests to commission and calibrate all

measuring, protection and control circuits and associated components ● Continuity and dielectric tests ● Power frequency pressure test ● Functional checks of all control wiring

(f) Valves, cocks and fittings.

'Type-test' for pressure test and compliance with the regulations laid down by the local Water Authority.

(g) Air Handling Units/Fan Coil Units

Type-test for cooling capacities, air flow, fan pressure and acoustic data. Pressure test for coils at factory.




11.8 ON-SITE TESTING AND COMMISSIONING

(a) General

One month before the date of completion of the contract works, the Contractor shall liaise with the Main Contractor and the other M/E Contractors and submit for the Consultant's approval a detailed programme for conducting on-site acceptance tests and commissioning.

Testing shall be broken into two phases. Acceptance tests to demonstrate that the installation is in accordance with the Specification in respect to plant duties, performance and control stability and Performance Tests to verify that the installation is capable of providing the required conditions.

Acceptance Tests shall be carried out immediately when commissioning is complete, however, the sub contractor shall be required to carry out Performance Tests during the first years operation as maximum load conditions prevail.

The sub contractor shall start up, operate, test and adjust the systems in accordance with the agreed programme. The setting up shall be supervised by the manufacturer's representative, who shall remain on site until the equipment is operating satisfactorily and accepted by the Consultant. The sub contractor shall advise and co-ordinate with the manufacturer's representatives so that all testing is carried out according to the agreed programme.

The whole systems shall be flushed through prior to any testing commissioning is carried out as detailed in each relevant section of the Specification.

The whole installation shall be given the following tests to bring the plant into running order. The Consultant shall be given reasonable notice together with a copy of recorded test results, generally not less than seven days, regarding the nature of tests, the time and location. Acceptance tests will only be witnessed by the Consultant when the submitted test results are found satisfactory.

All instruments, tools, materials and labour required to perform these tests shall be provided by the sub contractor.

If the test results show that the plant and equipment is not functioning in a satisfactory manner or satisfying the requirements of this Specification, the Consultant shall decide whether this is due to incorrectness of faulty work by the sub contractor and if this be the case, the sub contractor shall, when called upon, carry out at his own expense such alterations, replacements and adjustments as may be required, to the Consultant's decision as to what constitutes a satisfactory test shall be final.

The test report shall contain the following:

(i) Title page with record for name and address of parties involved and report date.

(ii) Summary comments for: ● Design versus final performance with notes to explain in detail why the

final performance varies ● Notable characteristic of system ● System operation sequence

(iii) Nomenclature sheets for equipment codes and technical data.

(iv) Test conditions with data for: ● Setting of dampers, fan drive, inlet vane ● Conditions of filters and coils ● Setting of supply air static pressure controller




(b) Chillers

All commissioning procedure shall comply with that set out in the current edition of the CIBSE Guide Commissioning Code Series R and ASHRAE Standard.

The Contractor shall carry out commissioning in conjunction with the chiller Contractor.

The following data shall be recorded on the commissioning sheets (list design and actual for each equipment item).

Prior to the initial start up of the chiller for the following test, the Chiller Specialist shall carry out final leak test and charge with refrigerant and lubrication oil.

Electrical Systems: the following tests shall be carried out by the sub contractor. ● Insulation Resistance - sections and overall ● Earthing ● Continuity Resistance on conductors and sheathing sections and overall ● Phasing out, including phase unbalance not exceeding 10% ● Check motor nameplate voltage and the incoming voltage ● Check motor rotation and speed, prior to connecting up to the driven

machine ● Full load current on each phase and power consumption ● Thermal overloads trip setting shall be checked and the settings recorded ● Circuit breaker overload settings shall be checked and recorded ● All circuits to be MEGGERED.

The following data shall be recorded on the commissioning sheets:

● Chilled water flow and return temperatures ● Evaporators pressure drop ● Condensers pressure drop ● Condenser fan air flow, pressure drop ● Refrigerant suction and discharge pressures and temperatures ● Compressors oil pressure ● Compressors and motor speeds ● Satisfactory operation and setting of high pressure, low pressure and oil

pressure failure cutouts, and other safety devices ● Motor alignment configuration, where applicable ● Operating current at 100%, 75%, 50%, 25% and 15% capacity operations ● Additional requirements as stipulated in the specification for Chiller ● Noise tests for chillers shall be carried out in accordance with the

requirements stipulated in the ‘Noise and Vibration Control’ Section of the Specification.

The sub contractor shall carry out acoustic test and sound pressure measurement shall be taken 1.5m approximately above the floor and 2.0m from the chillers.

The vibration amplitude shall be measured to ensure they are in line with manufactures recommendation.




(c) Air Handling Equipment & Ductwork

All the commissioning procedures shall comply with that set out in the current edition of the CIBSE guide Commissioning Code Series A ASHRE Standard 111-1988 (Sections 6, 8 and 10), BSRIA Manual for Regulating Air Condition Installation. The sub contractor shall allow for balancing all air diffusers and grilles by means of the regulating dampers provided.

The following data shall be recorded on the commissioning sheets:

● Dry and wet bulb temperatures ■ At ambient conditions ■ Within each occupied space, at various locations within same space

as required ■ At each main supply and return air duct ■ Before and after coil

● Water flow rate and pressure drop across each coil ● Entering and leaving water temperature and water temperature difference

across each coil ● Total system static pressure, discharge static pressure and suction static

pressure, and total air flow rate for fans or air handling unit. ● Fresh air supply flow rate and return air flow rate to each fan, or air handling

unit. ● Air flow and resistance across each main plant item, e.g. filter, cooling coil ● Air flow at each supply and exhaust duct, and at each supply, return and

exhaust air grille and diffuser, and the like. ● Outside air and return air damper position. ● All fan and motor speeds. ● Starting and operating currents for each motor.

The commissioning report shall also include the following equipment data:

(i) Fan

● Make/type ● Model no./size ● Serial no. ● Arrangement/class ● Discharge ● Sheave make ● Sheave size/bore ● Nos. of belts/make/size ● Nos. of filters/type/size

(ii) Motor

● Make/frame ● KW/RPM ● Volt/phase/Hz ● Full load Amps ● Sheave make ● Sheave size/bore ● Sheave centre line distance & adjustment




(iii) Coil

● Make/type ● Model/size ● Nos. rows/fins ● Face area ● Tube size ● Tube/fin material ● Circuitry

(iv) Air Terminal Device

● System/unit no. ● Location/zone ● Test apparatus ● Area served ● Air terminal device make ● Air terminal device no. ● Type/model ● Air terminal device size ● Air terminal device size ● Air Terminal Device AK/effective

Each fan shall be tested after installation and the fan speed adjusted to given approximately the design air quantity. After the outlets have been adjusted and the various systems balanced, a final check shall be taken of the flow, static pressure and power. The final air quantity shall not be less than the specified and not more than 10% above the specified figures or any approved variation to these figures.

All outlets, diffusers and grilles shall be initially adjusted to give the air quantities shown on the Drawings with a tolerance of + or - 10%.

In addition to this initial setting, the sub contractor make any further adjustments to the air distribution that may be required to ensure even temperatures, freedom from draughts throughout the conditioned areas and adequate ventilation.

The sub contractor shall forward one print of each relevant shop drawings marked up to show the measured air quantity to each of the following:

● Outlet, return or exhaust grille and the like. ● Main duct and each major branch duct, as determined by pitot traverse. ● Air handling unit or fan. Total air quantities for air conditioning units shall be

measured with the design air quantity through the cooling coil and the outside air dampers set at their minimum position. Outside and return air dampers shall be adjusted to give the design air quantities at minimum and maximum positions and any intermediate position noted on the Drawings.

● As an alternative to marking the air quantities on shop drawings, test sheets may be used accompanied by diagrams identifying each outlet.

Particular attention shall be given to establishing that the total air quantity for each system is within the allowable tolerance -0, +10%. This total shall be established by correlating readings for at least three methods of measurement in order of preference:




● Pitot traverse in main supply duct in accordance with BS 1042 - 1943. ● Actual pressure drop compared to manufacturers rated air pressure drop

through the cooling and/or heating coils. (ARI ratings). ● Sum of air quantities measured at all outlets with appropriate correction

factor applied according to the manufacturer's data for the particular method of measurement.

● Anemometer measurement taken 25mm off face of air leaving side and averaged over the area, of the filter or coil, with an appropriate correction factor applied (factor usually in order of 0.8 x reading on anemometer to obtain actual air quantity).

● Actual fan power consumption vs expected fan power consumption at the specified duty. (The sub contractor shall check fan dimensions and clearances against manufacturer's drawings, also correct calculation for power consumption to take account of power factor and motor efficiency and belt drive efficiency. The sub contractor shall also check expected actual system static resistance.)

The total air quantity shall be proven after the distribution system has been balanced.

For the purpose of testing the air distribution to zones and outlets it is acceptable to total up all the outlets and balance proportionately throughout with an allowable tolerance of ± 5% from the required air quantity by proportion. Direct reading volumeters may be used for preliminary balancing and comparative adjustment of air flows at outlets. However, if different types of outlets are used (e.g. side blow registers, ceiling diffusers, linear slots, and the like) and it is not possible to use substantially the same method of measurement for each outlet then the supply to each zone branch shall be checked using pitot or Alnor velocimeter. Calibrated anemometers shall be used for all final air flow measurements at outlets and at coils, air filter banks, fresh air intakes and the like. Special hoods shall be used to measure air flow for linear diffusers and light troffers. If different sized hoods are used then allowance shall be made for different correction factors which may apply. If the same hood is used throughout but the air quantities and/or size of diffusers vary substantially then allowance shall be made for variation to the hood correction factor.

Pitot tubes or direct reading volumeters with pitot probes shall be used for measurement of air flow rates in ducts and shall be based on the average of multiple readings at not more than 300mm centres and not less than one reading per 0.1m2 of cross sectional area of the duct.

In addition air distribution from supply air outlets shall be checked and adjusted as necessary to ensure that the direction and "throw" of air is adequate for the application, free from unacceptable draughts and generally uniform over the face of each outlet.

Air flow adjustments shall be made in such a manner that pressure drops through dampers at or near the faces of outlets are the minimum possible. Pressure drops required for restricting flow rates in low resistance branches such as short runs nearest to the fan shall be primarily achieved by means of the dampers provided at branch take-off points at the main duct. Adjustable fan drives, where provided, shall be used to obtain the correct air flow rates at the minimum possible fan speed with the minimum use of the dampers in the highest resistance run of ducting.

The following test and other additional tests also shall be required as instructed by Local Police Fire Department or other authorities who have jurisdiction.




(d) Water System

All the commissioning procedures shall comply with that set out in the current edition of the CIBSE Guide Commissioning Code Series W and ASHRAE 111-1988 Sections 6, 9 and 11.

All water systems shall be adjusted and balanced for the correct duty by the regulation valves provided.

The following data shall be recorded on the commissioning sheet:

● Circulation pump motor speed ● Pump OFF PD, no flow head, actual impeller diameter, full open head, full

open flow rate, final discharge pressure, final suction pressure, final head and final flow rate for each pump.

● Pressure at major branches. ● Water flow rates through major equipment ● Supply and return water temperatures of each water coil ● Starting and operating current of each pump motor ● Water pressure drop across each item of hydraulic equipment, e.g. cooling

coils, control valves, strainers, and the like.

The commissioning sheet shall also include the following data for pumps:

● Service/Location ● Make ● Model no. ● Serial no. ● Water flow rate/heat ● Required NPSH ● Pump RPM ● Impeller diameter ● Motor make/frame ● Motor Hp/RPM ● Volt/phase/Hz ● Full load pump ● Seal type

The sub contractor shall check and adjust all water quantities to within the following allowable tolerances:

● Pumps: -0% to +20% ● Coils: -5% to +20%

System shall be balanced with all control valves fully open and water quantities shall preferably be determined from the pressure drops across control valves and the manufacturer's nominated flow co-efficient.

The sub contractor shall record all test results and submit a report to the Consultant showing the following information.

● The measured water flow rates, pressure drops across control valves and flow co-efficient for each valve.

● The entering and leaving water temperature at each item of equipment and the calculated heating or cooling capacity.

● The entering and leaving air temperatures and air quantities across each cooling coil in major air conditioning units, measured at the same time as




item (5) and the calculated total cooling capacity.

The measured suction and discharge pressures at each pump shall be marked on a copy of the manufacturer's performance curve to show the water quantity delivered.

(e) Control System

The sub contractor shall ensure automatic controls to be commissioned and tested. Generally, the commissioning procedure shall comply with relevant clauses set out in the current edition of the CIBSE Guide Commissioning Code Series C.

The sub contractor shall calibrate all the modulating ranges and set points for all automatic valves, pressure sensors, and the like to ensure that operating conditions are correct. The time and control sequence shall also be tested and verified.

All valves, switches, controls, and the like shall be properly regulated.

Interlocking circuit and safety devices shall be tested to ensure safety operation of the plant.

(i) Wiring Test

● All wiring works within control panels shall be checked prior to despatch for loose connections, correct terminations and compliance with wiring diagrams. In addition, functional checks shall be carried out to ensure that all interlocking and sequencing is in accordance with the performance requirements of the Specification. Any test jumpers shall be removed at the end of the checking.

● Each transmission cable connected to the workstations and outstations shall be checked on an individual basis. The insulation for each transmission cable wire shall be checked to be above 10 M ohm.

● Wiring of each command output point, status input, analogue input, analogue output shall be checked and rectified to be in accordance with the shop drawings approved by the Consultant.

(ii) Hardwares Testing

All hardwares shall be tested to ensure they are functional. A simple proven software shall be loaded and the micro-computer, peripherals, communication cabling, and the like shall be tested by inputs and responses method. Every piece of hardware shall be tested thoroughly on all the functions it shall perform. Any defective hardware shall be replaced and not repaired.

(iii) Softwares Testing

After all the hardwares have been ascertained to be functional, the software packages to be provided shall be loaded and tested. Analogue as well as Digital outputs shall be monitored by light bulbs or small motors. All the functions of the softwares shall be tested. All "bugs" in the software shall be "debugged". Two copies of the commissioned softwares on hard discs shall be provided as backup in case the softwares are damaged while in use or lost.




(iv) Transducers Testing

All the input and output transducers shall be tested with associated electrical and mechanical equipment. All transducers for digital points shall be set at the proper on/off values and all transducers for analog points shall have their response curves checked by measurements at a minimum of ten points.

(v) System Testing

The ATC systems shall be tested as a whole with all the transducers inputs and outputs connected to DDCs or interfacing units. All major monitoring and control functions shall be tested at least twice.

(f) Electrical Tests

After erection of the panel on site and prior to testing the equipment, the following test shall be performed in the presence of the Consultant.

● Inspection of switchboard or control panel ● Mechanical test ● continuity and dielectric tests ● Functional checks ● Earth test

On completion of the above tests, the sub contractor shall commission the switchboard on no-load and perform the following tests:

● Voltage test for phase to phase and phase to neutral ● Phase sequence tests on every outgoing circuits

The following tests shall be carried out in full compliance with the I.E.E. Requirements by the sub contractor in the presence of the Consultant:

● Verification of polarity ● Insulation resistance test of all power and control cables ● Insulation resistance test of all motor windings ● Test of conductor continuity ● Test of effectiveness of earthing ● All thermal overload relays and starters ● Sequence of operation

Flick test of motors The sub contractor shall carry out the following test on all electrical motors and provide test certificates in duplicate:

● Check motor nameplate voltage ● Check motor rotation and speed, prior to connecting up to the driven

machine. ● Ascertain maximum kW absorbed by fan at the most demanding point of the

pressure/volume characteristic curve at the specified fan speed. ● Earth continuity loop resistance for every motor starter. ● Insulation to earth resistance for every motor starter taken with 500 volt

megger. ● Full load current taken by all motors on each phase. ● The tripping time of starter overloads set to 10% above the motor

nameplate rating (if thermal when hot).




Demonstration that each control works in accordance with the specification (i.e. selector switches correctly wired, high or low circuit cut-out operates, level switches correctly operate).

● Check motor temperature (in accordance with BS 4999). ● Check starting current of all motors.

(g) Miscellaneous Measurement and Testing

Room temperatures and humidities and noise levels shall be measured to ensure design conditions are achieved. Measuring instruments shall be mounted 1.5m above floor level at points away from the influence of draughts or hot or cold surfaces. Such measurements shall not be carried out when weather or other environmental conditions are likely to cause undue influence to the results.

Sound and vibration testing shall be carried out to ensure that equipments are operating with satisfactory sound and vibration levels and that there is no transmission of objectionable vibration or through the building structure. Sound levels shall be measured with and without the plant in operation.

All measurements shall be taken at a height of 1.5m above floor level and at least 1.5m from any wall, window or ceiling surface. Measurements shall be taken in octave bands from 63Hz to 8KHz.

Office total of 8 measurement positions shall be used on each office floor. This shall include at least 2 measurements at 1.5m from each plantroom.

Plant Rooms - Adjacent to main switchboard

External to Building - At all property Boundaries

Measurement of sound pressure levels shall be taken during conditions of maximum load of equipment or part load where directed otherwise by the Consultant at a time when the building is practically unoccupied. No measurement shall be taken closer than 1500mm to any outlet, and not closer than 1000mm to any ceiling, wall or floor surface.

Background noise levels during testing shall be below measured values by at least 6dB in all octaves.

Vibration test and analysis shall carried out as in the "Noise & Vibrations" Section and Application Handbook of ASHRAE (Testing, Adjusting and Balancing).




(h) Performance Tests

In addition to the commissioning requirements to above. Performance Tests shall be carried out and any necessary final adjustments arising therefore, be carried out at a time to be nominated during the Defects Liability. Period or, in the event of failure of the installation to meet the minimum requirements of this Specification, such extended period as may be permitted.

The Performance Tests shall be run over a period of up to five nominated consecutive days in any two months to be selected by the Consultant. During this period necessary facilities to log hourly intervals during normal working hours shall be provided:

● Ambient dry and wet bulb temperatures in a shaded location to be nominated.

● Internal dry and wet bulb temperatures in not less than one location per 200m2 of floor area of the conditioned space and as nominated.

● Estimates of the number of person in each area.

● Estimates in the total amount of lighting and heat producing appliances in use in each area.

● Fresh air intake flow rates at each air handling unit. Fresh air quantities shall be maintained as close as possible to the specified values during performance testing.

● Any other factors affecting the heat loads on the systems and beyond the control of the sub contractor.

With the above ambient and building heat load information obtained as a background, a minimum of three separate readings shall be obtained and subsequently averaged, for each air and water inlet and outlet temperature, humidity, pressure and flow rate, together with the speed, current draw and overload setting of each electrical drive.




11.9 LOCAL AUTHORITIES’ TESTS & INSPECTIONS

As and when notified in writing or instructed by the Consultant, the sub contractor shall attend all tests and inspections carried out by Local Authorities including the Water Authority, Environmental Protection Department, Police Fire Services Department and shall forthwith execute free of charge any rectification work ordered by the Consultant as a result of such tests and inspections which determine non-compliance with Local Regulations. These tests may take place after the issue of Practical Completion of the Contract and the sub contractor shall make all allowances in this respect.

The sub contractor shall be responsible for all necessary forms and shop drawings submissions to the Local Authorities which shall conform in layout to the latest architectural plans submitted kept by these authorities.

● The submission shall comply with the requirements of the Local authorities. The documents to be submitted by the sub contractor shall be forwarded to the Consultant for checking before submission.

● The sub contractor shall ensure that his submission shall not delay the subsequent inspection and test carried out by the Local Authorities, otherwise he shall be fully responsible for any consequence due to his delay.

● The sub contractor shall allow for at least two submissions to each authority of complete sets of documents to each Local Authority, one to be made within six months after the award of the Contract and the other before the Local Authorities inspection. The Consultant may at his discretion instruct the sub contractor for additional submissions whenever necessary.

The sub contractor shall notify the Consultant at least seven days in advance of his application for Local Authorities tests and inspections. On receipt from the Local Authorities of a confirmed date for test and inspection. The sub contractor shall inform the Consultant without delay.

11.10 TRAINING OF PLANT OPERATORS

After handover of the plant, the sub contractor shall provide training to the Owner/Principal's plant operators for three weeks in the safe and proper operation, care and maintenance of the system and shall demonstrate the operation of any special purpose plant requiring a skilled or certificated operator.

All instructions and demonstrations shall be carried out by way of special visits by competent and experienced technicians at a date to be notified by the Consultant.




12. SERVICE AND MAINTENANCE

12.1 SCOPE

The length of the Maintenance and Defects Liability period is to be as specified in Section 1.4. The sub contractor shall carry out regular inspections at periods not greater than one calendar month, and shall fully service and maintain all plant included in this Contract for the term of the Maintenance and Defects Liability period.

The work required is:

● Attend the site regularly to perform maintenance required by the equipment manufacturers and as detailed in the Operation and Maintenance Manuals.

● Attend the site at any time during the specified Contract maintenance period, on request by the Consultant or Owner, and carry out remedial work necessary to keep the plant in good operating condition.

● Make good any defects at the time of practical completion and all other defects which become apparent during the contract maintenance period.

12.2 SERVICE

The sub contractor shall undertake to provide a comprehensive breakdown service whereby a qualified mechanic attends the plant as soon as practicable after a breakdown is reported, and carries out immediate remedial work.

Where the sub contractor fails to attend the plant within eight (8) normal working hours of notification of a breakdown, and where remedial work is interrupted during normal working hours for purposes other than obtaining spare parts from the nearest source, the Consultant reserves the right to order such action as may reasonably expedite completion of remedial work at the sub contractor’s expense without abrogation of the sub contractor’s responsibility.

12.3 SERVICE REPORTS

During each visit the sub contractor shall complete a report in the form of a check list which shall indicate the readings of all gauges, the condition of all items, any remedial work carried out, and the wet and dry bulb temperatures of the outside air.

Service reports shall be completed in triplicate, signed by the sub contractor’s representative, and counter-signed by the Owner/Principal’s nominated representative.

One copy of the report shall be retained by the signatories, and the third copy shall be forwarded to the Consultant within forty eight hours.

Final payment of retention monies will only be certified pursuant to receipt by the Consultant of Service Reports which indicates that the Maintenance and Service requirements have been regularly and satisfactorily carried out.

The sub contractor shall submit for approval a sample Service Report in sufficient time for possible amendments required before Practical Completion.




13. OPERATING AND MAINTENANCE MANUALS

13.1 GENERAL

On completion of satisfactory Performance Tests and prior to Practical Completion, supply to the Consultant one copy of the Operating and Maintenance Manual for review and approval.

Once reviewed and approved, the number of copies specified in Section 1.4 of the approved manual shall be provided.

The Manual shall include a full description of the installation and function of the various systems involved, together with instructions to cover every action necessary for the efficient operation and maintenance of the installation(s).

The Manual shall be neatly prepared and bound in a vinyl hard-back multiple ring (minimum 3 rings) folder with embossed lettering on the front in the format approved by the Consultant.

In addition, the words “Operating and Maintenance Manual” and the project name shall be embossed along the spine of each folder.

13.2 MANUAL CONTENTS

The contents of the Manual shall generally take the following format:

(a) Emergency Information

This shall be a single page which lists contact numbers for emergency service.

(b) Index

The Index shall be divided into each section which shall include lists of drawings, equipment and similar items for quick reference.

(c) Section 1 - General Description

This section shall be divided into sub-sections for each system as appropriate. A full description of the systems installed including method of control shall be included.

(d) Section 2 - Plant Operating Instructions

This section shall be sub-divided into the various systems and a complete description and correct sequence of all actions necessary to start-up, operate and shutdown all plant for automatic test and emergency operation shall be included.

The instructions shall include all necessary instructions for the correct identification of malfunction of the plant together with the existence of hazardous conditions.

(e) Section 3 - Installation Maintenance & Operating Instructions

This section shall be divided into the various systems and manufacturer’s installation, maintenance and operating instructions shall be included for each item of equipment. A comprehensive maintenance schedule to be followed throughout the Maintenance and Defects Liability Period shall also be included.




(f) Section 4 – Equipment

This section shall be divided into the various systems and shall list all major items of equipment installed complete with manufacturer’s name, model, and/or Type No., Serial No., size design ratings. (i.e. all relevant data necessary for re-ordering or replacing).

All equipment shall be broken down to individually identifiable items.

(g) Section 5 - Commissioning Test Reports

This section shall include all test and commissioning results sheets.

(h) Section 6 - Installation Drawings

This section shall include all as installed post contract drawings as specified.

13.3 AS INSTALLED DRAWINGS

In accordance with earlier clauses of this specification, as installed drawings shall be correctly brought up to date to present a true and accurate representation of the actual installation and to a scale of not less than 1:50.

The aim of the drawings is to give a full and complete picture of the entire project as it has been built.

Generally the as installed drawings shall include the following:

● Complete ducting layout drawings showing the actual sizes and location of all ducts, dampers supply outlets, return inlets, fresh air intakes, exhaust outlets and the final measured air flow rates at all relevant locations.

● Complete plant room and/or equipment layout drawings with full identification of each and every item of equipment.

● Complete piping layout drawings showing the actual size and locations of all steam, water, air natural gas, and all other lines applicable to the system (s).

● Complete electrical and control wiring schematics clearly showing terminal numbering system. Include on the drawings settings (actual and scale) of all time delays and overloads.

● Complete schematic flow and control diagrams of all air, water, refrigerant, steam, instrument air, fuel oil, gas and any other systems incorporated in the installation. The drawings shall show all motorised, automatic and hand-operated controls such as dampers, valves, relieve valves, cut-outs, thermostats, expansion valves, solenoid valves, bleeds, vents, drains, strainers, gauges, thermometer wells, sight glasses, and all similar items relevant to the function of the installation. Where applicable the drawings shall also include the settings and differential bands of all controls, cut-outs and other variable or adjustable items. All items must be clearly identified as to type and function.

The quantity of sets, as specified in Section 1.4 of this specification, of prints of the above drawings shall be neatly prepared and submitted as full size in the installation manual.

Where the quantity of drawings involved is too great to fit in the Installation Manual a separate matching cover shall be supplied for each of the full size drawing sets and the drawings shall also be reduced to A3 size for inclusion in the manual.

Where specified in Section 1.4 of this specification all drawings shall be supplied on CDRom in AutoCAD (the latest version) and included in the manuals.

PHUÏ LUÏC A

DANH MUÏC BAÛN VEÕ MÔØI THAÀU TENDER DRAWINGS LIST

TECHNICAL SPECIFICATION - MVAC SERVICES appendix A – PAGE 1

BPS 37302 Revision 00

SCHEDULE OF TENDER DRAWINGSBEST WESTERN NHA TRANG PLAZA HOTEL NHA TRANG - VIETNAM

The following drawings shall be read in conjuntion with this specification

ITEM DESCRIPTION DRWG No. SCALE

1 COVER SHEET - -

2 LEGENDS, SCHEDULE OF DRAWINGS & GENERAL NOTES M0-01 NTS

3 SCHEDULE OF EQUIPMENTS M0-02 NTS

SCHEMATIC DIAGRAM

4 CHILLED WATER PIPING - SCHEMATIC DIAGRAM M1-01 NTS

5 STAIRCASE PRESSURIZATION & LOBBY SMOKE EXTRACTION SYSTEM - SCHEMATIC DIAGRAM M1-02 NTS

6 MECHANICAL VENTILATION SYSTEM - SCHEMATIC DIAGRAM (SHEET 01) M1-03 NTS



9 MVAC POWER SUPPLY - SCHEMATIC DIAGRAM (SHEET 1) M1-06 NTS

10 MVAC POWER SUPPLY - SCHEMATIC DIAGRAM (SHEET 2) M1-07 NTS

11 MVAC SYSTEM CONTROL – SCHEMATIC DIAGRAM (SHEET 1) M1-08 NTS

12 MVAC SYSTEM CONTROL – SCHEMATIC DIAGRAM (SHEET 2) M1-09 NTS

MVAC SYSTEMS

13 MVAC LAYOUT - BASEMENT PLAN M2-01 1:100

14 DUCT LAYOUT - 1st FLOOR PLAN M2-02 1:100

15 DUCT LAYOUT - 2nd FLOOR PLAN M2-03 1:100

16 DUCT LAYOUT - 3rd FLOOR PLAN M2-04 1:100

17 DUCT LAYOUT - 4th FLOOR PLAN M2-05 1:100

18 DUCT LAYOUT - TECHNICAL 1 FLOOR PLAN M2-06 1:100



21 DUCT LAYOUT - 7~10th FLOORS PLAN M2-09 1:100

22 DUCT LAYOUT - 11,14th FLOORS PLAN M2-10 1:100






28 DUCT LAYOUT - 21st FLOOR PLAN M2-16 1:100

29 DUCT LAYOUT - 22nd FLOOR PLAN M2-17 1:100


TECHNICAL SPECIFICATION - MVAC SERVICES appendix A – PAGE 2

BPS 37302 Revision 00







37 DUCT LAYOUT - TECHNICAL 2 FLOOR PLAN M2-25 1:100

38 DUCT LAYOUT - LIFT TECHNICAL FLOOR PLAN M2-26 1:100

39 DUCT LAYOUT - ROOF PLAN M2-27 1:100

40 PIPING LAYOUT - BASEMENT PLAN M2-28 1:100

41 PIPING LAYOUT - 1st FLOOR PLAN M2-29 1:100

42 PIPING LAYOUT - 2nd FLOOR PLAN M2-30 1:100

43 PIPING LAYOUT - 3rd FLOOR PLAN M2-31 1:100

44 PIPING LAYOUT - 4th FLOOR PLAN M2-32 1:100

45 PIPING LAYOUT - TECHNICAL 1 FLOOR PLAN M2-33 1:100



48 PIPING LAYOUT - 7~10th FLOORS PLAN M2-36 1:100

49 PIPING LAYOUT - 11,14th FLOORS PLAN M2-37 1:100






55 PIPING LAYOUT - 21st FLOOR PLAN M2-43 1:100

56 PIPING LAYOUT - 22nd FLOOR PLAN M2-44 1:100








64 PIPING LAYOUT - TECHNICAL 2 FLOOR PLAN M2-52 1:100

INSTALLATION DETAIL

65 TYPICAL INSTALLATION DETAIL 01 M4-01 NTS

66 TYPICAL INSTALLATION DETAIL 02 M4-02 NTS

PHUÏ LUÏC B

BAÛN LIEÄT KEÂ THOÂNG TIN KYÕ THUAÄT SCHEDULE OF TECHNICAL DATA

Nhaø thaàu phaûi ñieàn vaøo khoaûng troáng cuûa coät

“offered”, khoâng ñöôïc duøng nhöõng töø nhö “or equivalent”, “hoaëc töông ñöông” vaø phaûi noäp

laïi ñeå ñöôïc duyeät xeùt thaàu

TECHNICAL SPECIFICATION - MVAC SERVICES appendix B

DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………

SIGNATURE and CHOP: …………………………………………………………………………


SCHEDULE OF TECHNICAL DATABEST WESTERN NHA TRANG PLAZA HOTEL NHA TRANG - VIETNAM

The following information is required to assess tenders. The term “or equivalent” will not be accepted. Completed schedules shall be submitted with the tender.

M1. WATER-COOLED CHILLERS

ITEM DESCRIPTION SPECIFIED OFFERED

1. Manufacturer: Carrier, Trane, York

2. Country of Origin: Europe, USA

3. Model No.: -

4. Type: Water-cooled Liquid Chiller

5. Quantity: 04

6. Minimum Capacity: 1230 kWr (350Ton.r) each

COMPRESSORS

7. Type: High Eff. Centrifugal/ Screw

8. No. of Refrigeration Circuits: -

9. Refrigerant Type: R123/ R134a

10. Capacity Controls: Modulation

(Guide vane or slide valve)

11. Minimum % Part Load: 10%

EVAPORATORS

12. Type: Shell & Tube with internally finned Copper Tubes

13. Water Supply/Return Conn.: Victaulic

14. Water Supply / Returm Temp.: 6oC / 11oC

CONDENSERS

15. Type : Shell & Tube with internally finned Copper Tubes

16. Water Supply/Return Conn.: Victaulic

17. Ambient Temperature: HIGH (min 37oCDB)

18. Water Supply / Returm Temp.: 32oC / 37oC

OTHERS

19. Clean/Fouling Factors etc Refer Technical Specification

20. Working Pressures etc Refer Technical Specification


DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………



SCHEDULE OF TECHNICAL DATA (continue)

BEST WESTERN NHA TRANG PLAZA HOTEL NHA TRANG - VIETNAM

M2. COOLING TOWERS


1. Manufacturer: Marley, Mitsubishi, Shinwa

2. Country of Origin : USA, Europe, Japan

3. Model No.: -

4. Type: Open Circuit – Cross Flow

5. Quantity: 04

6. Minimum Heat Capacity: 1580 kWr (450Ton.r) each

7. Water Flow Rate: 74 L/s each minimum

8. Inlet Water Temp./ Outlet Water Temp.:

32oC / 37oC

9. Head Loss: 40 kPa (4 mH2O) Maximum

10. Inlet Water/ Outlet Water Conn.: Flange

11. Inlet Connection: ∅125 mm x 4

12. Outlet Connection: ∅250 mm x 1

13. Fan Speed (RPM): 360 RPM Maximum

14. Motor Rating (kW): 5.5 kW x 2

15. Absorbed Power (kW): -

16. Motor – Make: -

17. Motor – Starter Type: -

18. Motor – Driver Type: -

19. Overall Fan Efficiency: 70% minimum

20. Voltage / Phase / Hz: 380 V / 3P / 50 Hz

21. Dimension (WxDxH): -

22. Weight (kg): -

23. Sea environmental Corrosion Protection

Yes. See specification for more information


DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………





M3. PUMPS

M3.1 CHILLED WATER PUMPS


1. Manufacturer: Aurora, DAB, Grunfos, Monoflo

2. Country of Origin: Europe, USA, Japan

3. Model No.: -

4. Type: End Suction, Horizontal Split Casing – Centrifugal with VSD

5. Quantity: 4 (3 duty + 1 standby)


7. Pump Head: 350 kPa (35 mH2O) Minimum

8. Pump NPSH: -

9. Suction Connection: ∅150 mm

10. Discharge Connection: ∅125 mm

11. Pump Speed (RPM): 1500 RPM Maximum

12. Motor Rating (kW): 40 KW





17. Overall Pump Efficiency: 70% minimum



20. Weight (kg): -


DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………





M3 PUMPS

M3.2 TRANSFER CHILLED WATER PUMPS


1. Manufacturer: Aurora, DAB, Grundfos, Monoflo


3. Model No.: -





8. Pump NPSH: -




12. Motor Rating (kW): 25 kW








20. Weight (kg): -


DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………





M3 PUMPS

M3.3 COOLING WATER PUMPS


1. Manufacturer: Aurora, DAB, Grundfos, Monoflo


3. Model No.: -





8. Pump NPSH: -




12. Motor Rating (kW): 50 kW








20. Weight (kg): -


DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………





M4 PLATE HEAT EXCHANGERS


1. Manufacturer: Carrier, Ciat


3. Model No.: -

4. Type: Plate Type Heat Exchanger


6. Minimum Cooling Capacity: 1230 kWr (350Ton.r) each

7. Primary Chilled Water Flow Rate:

58 L/s each minimum

8. Secondary Chilled Water Flow Rate:

58 L/s each minimum

9. Inlet Water/ Outlet Water Temp. (Primary Side):

6oC / 11oC

10. Inlet Water/ Outlet Water Temp. (Secondary Side):

12oC / 7oC

11. Primary Pressure Drop: 50 kPa (5 mH20) maximum

12. Secondary Pressure Drop: 50 kPa (5 mH20) maximum

13. Primary Connection: Plange ∅150 mm - PN10

14. Secondary Connection: Plange ∅150 mm - PN10

15. Plate Material: Stainless Steel AISI 304

Plate Thickness 0.5mm

16. Number of Plates: -

17. Gasket: Nitril HT Gasket

18. Primary Side Maximum Working Pressure:

1.3 MPa

19. Secondary Side Maximum Working Pressure:

1.0 MPa

20. Dimension (WxLxH): 700x2100x2200mm

21. Weight (kg): -


DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………





M5. PRIMARY AIR UNIT (PAU)

M5.1 PAU 6-1, PAU 6-2



2. Country of Origin : Europe, Malaysia, Thailand

3. Model No.: -

4. Type: Horizontal Draw through, Double Skin, C/W VSD

5. Quantity: 02

COOLING COILS

6. Sensible Cooling Capacity: 60 kW.r

7. Total Cooling Capacity: 160 kW.r

8. Chilled Water Flow Rate: 7.6 L/s

9. Air Flow Rate: 5,600 L/s

10. Chilled Water Temperatures: Entering: 6oC, Leaving: 11oC

11. Air Entering Coil Temperature: 100% Out Side Air Intake

12. Air Leaving Coil Temperature: -

13. Coil Type: Copper Tubes, Aluminium Fins

14. Coil Face Area (M5): -

15. Coil Face Velocity: 2.5 m/s Maximum

16. No. of Rows: -

17. Air Flow SP Drop (kPa): -

FANS

18. External Static Pressure: 400 Pa Minimum

19. Motor Speed: 1450 RPM Maximum

20. Motor Break Power (kW):

21. Motor Power (kW):


23. Air Filter: High, low velocity & bag filters

23. Sound Level (63Hz-8kHz): -


DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M5.2 PAU TE.2-1, PAU TE.2-2




3. Model No.: -

4. Type: Horizontal Draw through, Double Skin, C/W VSD

5. Quantity: 02

COOLING COILS











16. No. of Rows: -


FANS









DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M5.3 PAU TE.2-3




3. Model No.: -

4. Type: Vertical Draw through, Double Skin, C/W VSD

5. Quantity: 01

COOLING COILS











16. No. of Rows: -


FANS









DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………





M6. FAN COIL UNITS (FCU)

M6.1 FCU 1-1A




3. Model No.: -

4. Type: Ceiling Conceal Ducted

5. Quantity: 01

COOLING COILS

6. Sensible Cooling Capacity: 25 kWr

7. Total Cooling Capacity: 37 kWr

8. Chilled Water Flow Rate: 1.76 l/s

9. Air Flow Rate: 1750 l/s


11. Air Entering Coil Temperature: 25.4 oC DB / 19.5 oC WB

12. Air Leaving Coil Temperature: 13.4 oC DB / 11.1 oC WB




16. No. of Rows: -


FANS


19. Motor Speed: 1450 RPM Maximum (W/ VSD)

20. Motor Break Power (kW): -

21. Motor Power (kW): -


23. Sound Level (63Hz-8kHz): Refer Technical Specification


DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.2 FCU 1-2A




3. Model No.: -


5. Quantity: 01

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.3 FCU 1-3A




3. Model No.: -


5. Quantity: 01

COOLING COILS











16. No. of Rows: -


FANS


19. Motor Speed: 1450 RPM Maximum (W/ VSD)






DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.4 FCU 1-1B



2. Country of Origin: Europe, Malaysia, Thailand

3. Model No.: -


5. Quantity: 1

COOLING COILS

6. Sensible Cooling Capacity: 16 kw

7. Total Cooling Capacity: 20 kw




11. Air Entering Coil Temperature: 25.6 oC DB / 18.0oC WB

12. Air Leaving Coil Temperature: 13.4 oC DB / 13.4oC WB




16. No. of Rows: -


FANS



20. Motor Break Power (Kw):

21. Motor Power (Kw):




DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.5 FCU 1-2B




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS


19. Motor Speed: 1450 RPM Maximum (W/ VSD )






DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.6 FCU 1-3B




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS


19. Motor Speed: 1450 RPM Maximum (VSD )






DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.7 FCU 1-4




3. Model No.: -


5. Quantity: 1

COOLING COILS

6. Sensible Cooling Capacity: 5.7 kw

7. Total Cooling Capacity: 9.0 kw









16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.8 FCU 1-5



2. Country of Origin – Prefer : Europe, Malaysia, Thailand

3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.9 FCU 2-1




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.10 FCU 2-2




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.11 FCU 2-3




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.12 FCU 2-4




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.13 FCU 2-5




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.14 FCU 2-6




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.15 FCU 2-7




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.16 FCU 2-8




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.17 FCU 2-9




3. Model No.: -


5. Quantity: 1

COOLING COILS



8. Chilled Water Flow Rate: 0.21l/s



11. Air Entering Coil Temperature: 25.1oC DB / 16.4oC WB

12. Air Leaving Coil Temperature: 12.8oC DB / 11.3oC WB




16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.18 FCU 2-10




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.19 FCU 3-1




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.20 FCU 3-2




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.21 FCU 3-3




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.22 FCU 3-4 ,3-11




3. Model No.: -


5. Quantity: 2

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.23 FCU 3-5




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.24 FCU 3-6 ,3-10




3. Model No.: -


5. Quantity: 2

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.25 FCU 3-7,3-8,3-9




3. Model No.: -


5. Quantity: 3

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.26 FCU 3-12,3-14,3-16




3. Model No.: -


5. Quantity: 3

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.27 FCU 3-13,3-15,3-17




3. Model No.: -


5. Quantity: 3

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.28 FCU 3-18,3-19,3-20




3. Model No.: -


5. Quantity: 3

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.29 FCU 3-21,3-23,3-25




3. Model No.: -


5. Quantity: 3

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.30 FCU 3-22,3-24,3-26




3. Model No.: -


5. Quantity: 3

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.31 FCU 3-27




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.32 FCU 4-1




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.33 FCU 4-2




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.34 FCU 4-3




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.35 FCU 4-4




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.36 FCU 4-5




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.37 FCU 4-6,4-7




3. Model No.: -


5. Quantity: 2

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.38 FCU 4-9,4-13




3. Model No.: -


5. Quantity: 2

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.39 FCU 4-10,4-12




3. Model No.: -


5. Quantity: 2

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.40 FCU 4-14




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.41 FCU 4-15




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.42 FCU 4-16,4-18,4-20




3. Model No.: -


5. Quantity: 3

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.43 FCU 4-17,4-19,4-21




3. Model No.: -


5. Quantity: 3

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.44 FCU 4-22,4-23,4-24




3. Model No.: -


5. Quantity: 3

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.45 FCU 4-25




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.46 FCU 5-1




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.47 FCU 5-2




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.48 FCU 5-3




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.49 FCU 5-4




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.50 FCU 6-1




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.51 FCU 6-2,6-3,6-4




3. Model No.: -


5. Quantity: 3

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.52 FCU 6-5




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.53 FCU 6-6




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.54 FCU 6-7




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.55 FCU 6-8,6-9,6-10




3. Model No.: -


5. Quantity: 3

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.56 FCU “1”




3. Model No.: -


5. Quantity: 460

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.57 FCU “2”




3. Model No.: -


5. Quantity: 728

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.58 FCU “3”




3. Model No.: -


5. Quantity: 40

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.59 FCU “4”




3. Model No.: -


5. Quantity: 16

COOLING COILS

6. Sensible Cooling Capacity: 7.3kw










16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.60 FCU “5”




3. Model No.: -


5. Quantity: 4

COOLING COILS











16. No. of Rows: -


FANS







\


DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.61 FCU “6”




3. Model No.: -


5. Quantity: 8

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.62 FCU 39-1,39-2




3. Model No.: -


5. Quantity: 2

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.63 FCU 39-3,39-4




3. Model No.: -


5. Quantity: 2

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.64 FCU 39-5,39-6,39-7




3. Model No.: -


5. Quantity: 3

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………






M6.65 FCU 39-8




3. Model No.: -


5. Quantity: 1

COOLING COILS











16. No. of Rows: -


FANS








DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………





M7. VARIABLE AIR VOLUME (VAV) BOX


1. Manufacturer: Titus, Trox

2. Country of Origin: USA, Europe, Malaysia

M7.1 VAV 7-1 ,7-3

Model No.:

Type: DDC control

Quantity: 08

Design Air Flow Rate: 650 l/s

Minimum Air Flow Rate: 500 l/s

M7.2 VAV 7-2,7-4

Model No.:

Type: DDC control

Quantity: 08

Design Air Flow Rate: 500 l/s

Minimum Air Flow Rate: 100 l/s


DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………





M8. FANS


1. Manufacturer: Fantech, Kruger, Woods

2. Country of Origin – Prefer : USA, Europe, Australia

M8.1 EAF B-1

Type: Wall Mounted

Quantity: 01

Air Flow Rate: 400 l/s

Speed (RPM): -

Fan Static Pressures (Pa): -

Power (Voltage/Phases/Hz): 380 V / 3P / 50 Hz

M8.2 EAF B-2

Type: Wall Mounted

Quantity: 01


Speed (RPM): -



M8.3 EAF B-3

Type: Wall Mounted

Quantity: 1


Speed (RPM): -



M8.4 EAF B-4

Type: Wall Mounted

Quantity: 1


Speed (RPM): -




DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………





M8. FANS


M8.5 EAF B-5

Type: Axial

Quantity: 01

Air Flow Rate: 4,500 l/s

Speed (RPM): -

Fan Static Pressures (Pa): 150 Pa Minimum


M8.6 EAF 4

Type: Axial

Quantity: 01


Speed (RPM): -



M8.7 EAF TE.1

Type: Axial

Quantity: 1


Speed (RPM): -



M8.8 SPF 40-1,40-2

Type: Axial

Quantity: 2


Speed (RPM): 600

Fan Static Pressures (Pa): 1450 RPM Maximum



DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………





M9. FANS


M8.9 SEF R-1

Type: Axial

Quantity: 01


Speed (RPM): 1450 RPM Maximum



M8.10 TEF R-1, R-2

Type: Axial

Quantity: 2





M8.11 TEF R-3, R-4

Type: Axial

Quantity: 2






DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………





M8. CONTROL SYSTEM


1. Manufacturer: Johnson Controls, Danfos, Siemens, Honeywell

2. Country of Origin : Europe, USA, Japan

M9. ACCESSORIES


1. DDC CONTROLS, SENSORS

Manufacturer: Johnson Controls, Danfos, Siemens, Honeywell

Country of Origin : Europe, USA, Japan

2. CONTROL VALVES

Manufacturer: Enolgas, Oventrop, TA

Country of Origin: Europe, Japan, USA

3. VALVES, GAUGES, FITTINGS

Manufacturer: Kitz, Oventrop, TA

Country of Origin: Europe, Japan, USA

4. REGISTERS / DISFFUSERS / GRILLES / DAMPERS / AIR FILTER

Manufacturer: Asli, Titus, Trox

Country of Origin : Europe, Japan, Malaysia, Thailand

5. INSULATION MATERIALS

Ductwork Insulation Manuf.: Kimco, AsiaPacific, Polyglass

Ductwork Insulation Type: Fibreglass to BS 476-part 7

Pipe work Insulation Manuf.: Aeroflex, Amarflex, Thermoflex

Pipe work Insulation Type: Closed Cell Structure, EPDM

Country of Origin: Europe, Japan, Malaysia Thailand

6. DUCTWORK, PIPEWORK

Ductwork Supplier: Southern Steel Sheet

Pipework Supplier: Seah, Vinapipe


DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………





M9. ACCESSORIES


7. ELECTRICAL (MSSB shall be provided by Electrical Services Sub Contractor)

Switchboard Metal Cabinet Hai Nam, Sang Tao, Sunlight.

MCB, CB ABB, GE, Merlin Gerin, Siemens

Country of Origin: Australia, Europe, Japan, USA

Power, Control Cables Draka, LS, Nexans, Olex, Pirelli, Wilson

Country of Origin: Australia, Europe, Japan, USA


DATE: …………………………………………………………………………

NAME OF TENDERER: …………………………………………………………………………

REPRESENTED BY: …………………………………………………………………………

POSITION HELD: …………………………………………………………………………



SCHEDULE OF DEVIATION FROM SPECIFICATION


Provide details where the tender does not comply with the Specification.

Submit this schedule with the tender.

ITEM DESCRIPTION OFFERED DEVIATION

PHUÏ LUÏC C

BAÛN DÒCH TIEÁNG VIEÄT THAM KHAÛO REFERENCE VIETNAMESE TRANSLATION

BAÛN DÒCH CHÆ MANG TÍNH CHAÁT THAM KHAÛO. VAÊN

BAÛN CHÍNH THÖÙC LAØ PHIEÂN BAÛN TIEÁNG ANH

THE VIETNAMESE TRANSLATION IS FOR REFERENCE ONLY. OFFICIAL DOCUMENT IS ENGLISH VERSION

BPS ♦ 37302 ♦ Phieân baûn 00 Ngaøy phaùt haønh: 06.2009

Quy Phaïm Kyõ Thuaät HAÏNG MUÏC ÑHKK & QUAÏT GIOÙ

COÂNG TRÌNH:

KHAÙCH SAÏN NHA TRANG PLAZA NHA TRANG – VIEÄT NAM

CHUÛ ÑAÀU TÖ:

COÂNG TY COÅ PHAÀN HAVANA TP. HCM - VIEÄT NAM

TÖ VAÁN THIEÁT KEÁ:

BONWAY PROJECT SERVICESMechanical & Electrical Consulting Engineers

Thieân Sôn Building - 5 Nguyen Gia Thieu Suit 403 - District 3 - HCMC - VIET NAM

KHAÙCH SAÏN NHA TRANG PLAZA NHA TRANG - VIETNAM

QUY PHAÏM KYÕ THUAÄT – HEÄ THOÁNG MVAC

MUÏC LUÏC

Trang

BPS ♦ 37302 Phieân baûn 00

1. PHAÏM VI COÂNG VIEÄC ................................................................................................ 1 1.1 MOÂ TAÛ DÖÏ AÙN................................................................................................... 1 1.2 MOÂ TAÛ DÒCH VUÏ ............................................................................................... 1 1.3 ÑÒNH NGHÓA THUAÄT NGÖÕ SÖÛ DUÏNG ........................................................... 1 1.4 PHAÏM VI COÂNG VIEÄC...................................................................................... 3 1.5 DANH MUÏC BAÛN VEÕ ........................................................................................ 4

2. PHOÁI HÔÏP VAØ COÂNG VIEÄC CUÛA NHÖÕNG NHAØ THAÀU KHAÙC............................... 5 2.1 PHOÁI HÔÏP ......................................................................................................... 5 2.2 COÂNG VIEÄC CUÛA NHÖÕNG NHAØ THAÀU KHAÙC.............................................. 5

3. YEÂU CAÀU CUÏ THEÅ CUÛA DÖÏ AÙN ................................................................................ 8 3.1 YEÂU CAÀU THIEÁT KEÁ ........................................................................................ 8

4. CAÙC YEÂU CAÀU CHUNG ........................................................................................... 10 4.1 KIEÅM TRA COÂNG TRÖÔØNG .......................................................................... 10 4.2 CAÙC YEÂU CAÀU VAØ TIEÂU CHUAÅN BAÉT BUOÄC ............................................ 10 4.3 CHEÁ ÑOÄ BAÛO HAØNH ...................................................................................... 10 4.4 ÑAËC TÍNH KYÕ THUAÄT VAØ BAÛN VEÕ .............................................................. 10 4.5 CAÙC MAÂU THUAÃN VAØ THIEÁU SOÙT .............................................................. 10 4.6 THI COÂNG CAÙC LOÃ MÔÛ ................................................................................. 11 4.7 VÒ TRÍ THIEÁT BÒ .............................................................................................. 11 4.8 PHOÁI HÔÏP TRONG LAÉP ÑAËT ....................................................................... 11 4.9 COÂNG TAÙC THI COÂNG VAØ BAÛO HAØNH....................................................... 11 4.10 BAÛN VEÕ TRIEÅN KHAI CHI TIEÁT THI COÂNG ................................................ 12 4.11 BAÛN VEÕ HOAØN COÂNG ................................................................................... 12 4.12 SÖÏ KHOÂNG CHUAÅN XAÙC CUÛA THIEÁT BÒ.................................................... 12 4.13 THIEÁT BÒ NGUYEÂN CUÏM ............................................................................... 12 4.14 MAÃU VAÄT TÖ ................................................................................................... 14 4.15 SÖÏ GIAO THOA VOÂ TUYEÁN .......................................................................... 14 4.16 DAÙN NHAÕN...................................................................................................... 14 4.17 TAY NGHEÀ VAØ VAÄT LIEÄU.............................................................................. 15 4.18 BOÁ TRÍ ............................................................................................................. 15 4.19 ÑEÀ PHOØNG TRONG QUAÙ TRÌNH THI COÂNG ............................................. 16 4.20 HEÄ DAØN GIAÙO VAØ THIEÁT BÒ NAÂNG ............................................................. 16 4.21 CHEØN KHE HÔÛ ............................................................................................... 16 4.22 MAÙY MOÙC THIEÁT BÒ VAØ NUÙT BÍT ................................................................ 17 4.23 LÖU KHO VAØ BAÛO QUAÛN .............................................................................. 17 4.24 VEÄ SINH VAØ CHUYEÅN RAÙC KHOÛI COÂNG TRÖÔØNG ................................. 18 4.25 TIEÁNG OÀN VAØ ÑOÄ RUNG .............................................................................. 18 4.26 HEÄ THOÁNG OÁNG LOÙT (PIPE SLEEVE) ....................................................... 19 4.27 GIAÕN NÔÛ .......................................................................................................... 20

5. THIEÁT BÒ .................................................................................................................... 21 5.1 CHILLER LY TAÂM HOAËC TRUÏC VÍT– GIAÛI NHIEÄT BAÈNG NÖÔÙC ............ 21 5.2 THAÙP LAØM MAÙT ............................................................................................. 27 5.3 BÔM LY TAÂM (CENTRIFUGAL PUMPS)...................................................... 29 5.4 PAU (PRIMARYAIR HANDLING UNITS)...................................................... 30 5.5 FCU (FAN COIL UNITS) ................................................................................. 35 5.6 HOÄP ÑIEÀU KHIEÅN LÖU LÖÔÏNG GIOÙ (VAV BOXES) .................................. 37 5.7 THIEÁT BÒ BIEÁN TAÀN (VSD)............................................................................ 37 5.8 PHIN LOÏC GIOÙ (AIR FILTERS) ..................................................................... 41



MUÏC LUÏC

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5.9 QUAÏT HÖÔÙNG TRUÏC (AXIAL FLOW FANS) ............................................... 43 5.10 QUAÏT LY TAÂM (CENTRIFUGAL FANS)....................................................... 46 5.11 QUAÏT LY TAÂM IN-LINE (CENTRIFUGAL FANS IN-LINE) ......................... 46 5.12 QUAÏT GAÉN TÖÔØNG HOAËC TRAÀN (PROPELLER FANS - WALL OR

CEILING MOUNTED)................................................................................... 46 5.13 QUAÏT HUÙT GAÉN TREÂN MAÙI (ROOF MOUNTED FAN) .............................. 47 5.14 BÌNH GIAÕN NÔÛ LOAÏI KÍN .............................................................................. 47

6. OÁNG GIOÙ VAØ PHUÏ KIEÄN (DUCTWORK & FITTINGS)........................................... 48 6.1 TOÅNG QUAÙT ................................................................................................... 48 6.2 VAÄT LIEÄU OÁNG GIOÙ BAÈNG TOÂN .................................................................. 49 6.3 OÁNG GIOÙ MEÀM ............................................................................................... 49 6.4 PHUÏ KIEÄN........................................................................................................ 50 6.5 CHI TIEÁT ÑÔÕ, GIAÙ TREO VAØ GIAÈNG GIA COÁ OÁNG GIOÙ ........................... 53 6.6 MIEÄNG GIOÙ ..................................................................................................... 54 6.7 CAÙCH NHIEÄT VAØ CAÙCH AÂM ......................................................................... 56 6.8 NIEÂM KÍN VAØ CHOÁNG DOÄT .......................................................................... 58 6.9 ÑIEÅM KIEÅM TRA ............................................................................................. 60 6.10 COÂNG TAÙC VEÄ SINH VAØ BAÛO VEÄ TRONG KHI THI COÂNG...................... 61 6.11 THÖÛ NGHIEÄM ROØ RÆ OÁNG GIOÙ .................................................................... 61

7. HEÄ THOÁNG ÑÖÔØNG OÁNG VAØ PHUÏ KIEÄN .............................................................. 62 7.1 TOÅNG QUAÙT ................................................................................................... 62 7.2 VAÄN HAØNH VAØ THÖÛ NGHIEÄM AÙP LÖÏC ....................................................... 63 7.3 VAÄT LIEÄU ÑÖÔØNG OÁNG ................................................................................ 63 7.4 MOÁI NOÁI, RAÉC-CO VAØ MAËT BÍCH OÁNG ...................................................... 64 7.5 PHUÏ KIEÄN OÁNG .............................................................................................. 66 7.6 KYÕ THUAÄT HAØN HEÄ THOÁNG OÁNG SAÉT ...................................................... 66 7.7 CAÙC MOÁI HAØN TREÂN HEÄ THOÁNG OÁNG UPVC .......................................... 67 7.8 MOÁI HAØN ÔÛ HEÄ THOÁNG OÁNG ÑOÀNG .......................................................... 68 7.9 HEÄ THOÁNG GIAÙ ÑÔÕ OÁNG.............................................................................. 68 7.10 MOÁI NOÁI OÁNG MEÀM VAØ GIAÕN NÔÛ................................................................ 72 7.11 MIEÁNG CHAËN ................................................................................................. 72 7.12 THANH DAÃN.................................................................................................... 73 7.13 ÑOÄ DOÁC ÑÖÔØNG OÁNG .................................................................................. 74 7.14 XAÛ KHÍ ............................................................................................................. 74 7.15 ÑIEÅM THOAÙT .................................................................................................. 74 7.16 VAN .................................................................................................................. 75 7.17 MAÙY ÑO LÖU LÖÔÏNG VAØ ÑOÀNG HOÀ ÑO .................................................... 79 7.18 ÑIEÅM KIEÅM TRA AÙP SUAÁT/ NHIEÄT ÑOÄ CHUNG ........................................ 80 7.19 OÁNG LOÙT (PIPE SLEEVE)............................................................................. 80 7.20 LOÏC NÖÔÙC (ÑÖÔØNG OÁNG)........................................................................... 81 7.21 BUÙA HAÕM NÖÔÙC ............................................................................................ 81 7.22 LAØM VEÄ SINH OÁNG........................................................................................ 81 7.23 CAÙCH NHIEÄT ÑÖÔØNG OÁNG.......................................................................... 81 7.24 VAN XAÛ KHÍ VAØ NGAÉT CHAÂN KHOÂNG ÑOÁI VÔÙI ÑÖÔØNG OÁNG NÖÔÙC... 85

8. HEÄ THOÁNG XÖÛ LYÙ NÖÔÙC ........................................................................................ 87 8.1 TOÅNG QUAÙT ................................................................................................... 87 8.2 HEÄ THOÁNG XÖÛ LYÙ NÖÔÙC ............................................................................. 88

9. HEÄ THOÁNG ÑIEÄN ...................................................................................................... 91



MUÏC LUÏC

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9.1 TOÅNG QUAÙT ................................................................................................... 91 9.2 TUÛ ÑIEÄN PHUÏC VUÏ CÔ KHÍ (MSSB)............................................................ 91 9.3 LINH KIEÄN TRONG PANEL ÑIEÀU KHIEÅN ÑIEÄN ......................................... 93 9.4 LAÉP ÑAËT HEÄ THOÁNG ÑIEÄN .......................................................................... 95

10. SÔN, DAÙN NHAÕN VAØ HOAØN TAÁT ........................................................................... 97 10.1 VAÄT LIEÄU ......................................................................................................... 97 10.2 MAÙY MOÙC VAØ THIEÁT BÒ ................................................................................ 97 10.3 THIEÁT BÒ BAÈNG KIM LOAÏI LOÄ THIEÂN.......................................................... 97 10.4 THIEÁT BÒ KIM LOAÏI ÑÖÔÏC BAÛO VEÄ ............................................................. 97 10.5 CAÙCH ÑIEÄN THIEÁT BÒ HOAØN CHÆNH NAÈM AÂM TRONG TÖÔØNG............. 97 10.6 HEÄ THOÁNG OÁNG VAØ VOÛ BOÏC KIM LOAÏI .................................................... 98 10.7 NHAÄN DAÏNG HEÄ THOÁNG OÁNG.................................................................... 98 10.8 NHAÄN DAÏNG OÁNG GIOÙ ................................................................................. 98 10.9 SÔ ÑOÀ MAØU SAÉC ........................................................................................... 99 10.10 DAÙN NHAÕN...................................................................................................... 99 10.11 ÖÙNG DUÏNG CUÛA SÔN ................................................................................. 100

11. THÖÛ NGHIEÄM & NGHIEÄM THU ............................................................................ 101 11.1 TOÅNG QUAÙT ................................................................................................. 101 11.2 GIAÙM SAÙT BÔÛI ÑOÄI NGUÕ KYÕ SÖ TÖØ NHAØ SAÛN XUAÁT ............................ 101 11.3 THUÛ TUÏC CHAÁP THUAÄN ............................................................................. 101 11.4 THÖÛ NGHIEÄM VAØ NGHIEÄM THU THIEÁT BÒ ............................................... 102 11.5 KIEÅM TRA TRONG SUOÁT QUAÙ TRÌNH LAÉP RAÙP .................................... 102 11.6 NGHIEÄM THU SÔ BOÄ VAØ TIEÀN XÖÛ LYÙ ...................................................... 103 11.7 THÖÛ NGHIEÄM TAÏI XÖÔÛNG.......................................................................... 104 11.8 THÖÛ NGHIEÄM VAØ NGHIEÄM THU TAÏI COÂNG TRÖÔØNG ........................... 105 11.9 KIEÅM TRA CUÛA CÔ QUAN ÑÒA PHÖÔNG ................................................. 115 11.10 HUAÁN LUYEÄN NHAÂN VIEÂN VAÄN HAØNH MAÙY .......................................... 115

12. DÒCH VUÏ VAØ BAÛO TRÌ ............................................................................................ 116 12.1 PHAÏM VI ........................................................................................................ 116 12.2 DÒCH VUÏ ........................................................................................................ 116 12.3 BAÙO CAÙO....................................................................................................... 116

13. SOÅ TAY VAÄN HAØNH VAØ BAÛO TRÌ ......................................................................... 117 13.1 TOÅNG QUAÙT ................................................................................................. 117 13.2 NOÄI DUNG SOÅ TAY VAÄN HAØNH VAØ BAÛO TRÌ .......................................... 117 13.3 BAÛN VEÕ HOAØN COÂNG ................................................................................. 118

KHAÙCH SAÏN NHA TRANG PLAZA NHA TRANG - VIETNAM Trang 1



1. PHAÏM VI COÂNG VIEÄC

1.1 MOÂ TAÛ DÖÏ AÙN

KHÁCH SẠN NHA TRANG PLAZA được thiết kế mới tọa lạc ở Nha Trang – Việt Nam. Nó bao gồm các tòa nhà sau: Level Space Usage GFA

Basement Carpark & M&E Plantrooms 2,895 m2

Level 1 Commercial, Lobbies & Carpark 2,846 m2

Level 2 Restaurant, Kitchen, Carpark 2,547 m2



Level 5 Sport Hall, Dining Room, Swimming Pool 2,875 m2

Level 6 Entertainments, Plantrooms 2,230 m2

Level 7 ~ 10 Hotel, Offices 4 x 2,350 m2

Level 11 ~ 19 Hotel, Villa and Garden 8 x 2,350 m2

Level 20, 21 Hotel, Technical Area 2 x 2,350 m2

Level 22 ~ 38 Hotel 16 x 1,800 m2

Level 39 Restaurant 1,800 m2

TOTAL GROSS FLOOR CONSTRUCTION AREA: ≈ 82,418 m2

Chiều cao tòa nhà khoảng + 128m so với cốt 0 tầng trệt

1.2 MOÂ TAÛ DÒCH VUÏ Dòch vuï ñöôïc moâ taû trong Quy phaïm Kyõ thuaät naøy bao goàm cung caáp, laép ñaët, thöû nghieäm & nghieäm thu vaø baûo trì trong giai ñoaïn theo doõi vaø khaéc phuïc sai soùt cuûa heä thoáng thoâng gioù vaø ÑHKK. Heä thoáng thoâng gioù ñöôïc laép ñaët taïi phoøng maùy thieát bò, taàng haàm, nhaø beáp vaø nhaø veä sinh. Heä thoáng ÑHKK vôùi maùy laïnh trung taâm giaûi nhieät nöôùc, maùy PAU vaø caùc maùy ÑHKK loaïi FCU ,hoäp ñieàu chænh gioù VAV ñöôïc laép ñaët taïi nhöõng khu vöïc qui ñònh.

1.3 ÑÒNH NGHÓA THUAÄT NGÖÕ SÖÛ DUÏNG

Những định nghĩa dưới đây áp dụng cho thuật ngữ dùng trong bảng danh mục này và bản vẽ kèm theo.

Chuû ñaàu tö: CTY CỔ PHẦN HAVANA

Thieát keá Kieán truùc: HTT

Thieát keá KT M&E: BONWAY PROJECTS SERVICES Nhaø Thaàu phuï: Nhaø thaàu heä thoáng Cô Ñieän Laïnh ñöôïc chæ ñònh thöïc

hieän coâng taùc ñöôïc neâu trong Quy phaïm Kyõ thuaät vaø baûn veõ




Nhaø Thaàu chaùnh: Nhaø thaàu chaùnh phuï traùch xaây döïng coâng trình Pheâ duyeät: Caên cöù treân pheâ duyeät cuûa Chuû ñaàu tö/ Quaûn lyù coâng

trình, vaø/ hoaëc Tö vaán.




1.4 PHAÏM VI COÂNG VIEÄC

Tröø phi ñöôïc qui ñònh khaùc, Quy phaïm Kyõ thuaät naøy bao goàm vieäc cung caáp heä thoáng hoaøn chænh, phuø hôïp vaø saün saøng cho söï vaän haønh lieân tuïc, an toaøn vaø höõu hieäu. Do vaäy, nhaø thaàu phuï phaûi cung caáp, chuyeån giao, laép ñaët, thöû nghieäm, nghieäm thu vaø boá trí vaän haønh heä thoáng. Nhaø thaàu phuï phaûi cung caáp toaøn boä nhöõng haïng muïc phuï trôï ñöôïc moâ taû cuï theå treân baûn veõ vaø caû nhöõng haïng muïc khoâng ñöôïc ñeà caäp ñeán treân baûn veõ nhöng caàn thieát cho heä thoáng. Nhaø thaàu phuï chòu traùch nhieäm tính toaùn coät aùp cuûa toaøn boä quaït vaø bôm ñeå baûo ñaûm phaân phoái ñuùng soá löôïng nöôùc vaø khoâng khí taïi nhöõng vò trí ñöôïc qui ñònh treân baûn veõ vaø ñöôïc neâu trong Quy phaïm kyõ thuaät naøy. Phaïm vi coâng vieäc bao goàm: (a) Thieát bò laøm laïnh trung taâm: maùy laïnh Chiller ñaët ôû taàng haàm, bôm, thaùp

heä thoáng oáng nöôùc laïnh boïc caùch nhieät… phuïc vuï cho toaøn boä khaùch saïn. (b) Toaøn boä heä thoáng thoâng gioù/ phaân phoái gioù gioù bao goàm maùy xöû lyù khoâng

khí (PAU), maùy ñieàu hoøa khoâng khí (FCU) goàm thieát bò ñieàu khieån vaø boä ñieàu chænh nhieät ñoä khoâng khí, quaït thoâng gioù, loïc gioù, oáng gioù, v.v.

(c) Toaøn boä mieäng caáp gioù/ mieäng gioù vaø phuï kieän heä thoáng phaân phoái gioù bao goàm van ñieàu chænh löu löôïng gioù vaän haønh baèng tay, van chia gioù, mieäng laáy gioù, v.v. lieân quan ñeán heä thoáng MVAC

(d) Toaøn boä heä thoáng thoâng gioù cô cho nhaø veä sinh, phoøng maùy thieát bò nhö ñöôïc neâu treân baûn veõ

(e) Heä thoáng oáng thoaùt nöôùc ngöng tuï vaø phuï kieän (f) Toaøn boä heä thoáng caùch nhieät lieân quan ñeán coâng taùc laép ñaët heä thoáng

MVAC (g) Toaøn boä coâng taùc kieåm soaùt ñoä oàn vaø ñoä rung lieân quan ñeán vieäc laép ñaët heä

thoáng MVAC Nhaø thaàu phuï phaûi chuù yù ñeán vieäc ño vaø xöû lyù ñoä oàn vaø ñoä rung ñöôïc neâu roõ trong Quy phaïm kyõ thuaät naøy ñeå ñaït ñöôïc möùc ñoä oàn theo qui ñònh. Tính toaùn chi tieát vaø baûn veõ trieån khai chi tieát thi coâng phaûi ñöôïc ñeä trình pheâ duyeät. Coâng vieäc xöû lyù aâm thanh ñöôïc neâu roõ trong Quy phaïm kyõ thuaät naøy laø nhöõng yeâu caàu toái thieåu phaûi coù vaø phaûi ñöôïc cung caáp trong moïi tröôøng hôïp

(h) Toaøn boä coâng taùc veà heä thoáng ñieän coù lieân quan ñeán vieäc laép ñaët heä thoáng MVAC (töø tuû phaân phoái MSSB / tuû cuïc boä MSSB ñeán thieát bò. Caùp ñieän töø tuû MSB ñeán tuû MSSB seõ do nhaø thaàu heä thoáng Ñieän cung caáp vaø laép ñaët. Tham khaûo baûn veõ ñeå bieát chính xaùc giôùi haïn nhieäm vuï cuûa töøng boä phaän)

(i) Toaøn boä Heä thoáng quaûn lyù naêng löôïng toaø nhaø (BMS), bao goàm caùp ñieän töø caùc module ñieàu khieån ñeán thieát bò (neáu goùi thaàu naøy taùch rieâng, nhaø thaàu BMS chòu traùch nhieäm cung caáp vaø keát noái caùp ñeán töøng ñieåm ñaáu noái vôùi thieát bò theo yeâu caàu).

(j) Cung caáp caùc giao dieän ñaáu noái cuûa thieát bò ÑHKK vôùi heä thoáng BMS theo baûn veõ thieát keá BMS.

(k) Cung caáp coâng taéc khaån ñieàu chænh baèng tay taïi phoøng kieåm soaùt chaùy ñeå ngaét quaït cuûa heä thoáng MVAC cuûa toøa nhaø khi coù tín hieäu baùo chaùy




(l) Supply and installation of control cables (fire rated type) from module controllers of Fire Alarm system to all MVAC equipments such as motorized damper…

(m) Cung caáp vaø laép ñaët caùp tín hieäu loaïi choáng chaùy töø moâ-ñun ñieàu khieån cuûa heä thoáng baùo chaùy ñeán caùc thieát ÑHKK & thoâng gioù nhö laø quaït huùt khoùi, quaït ñieàu aùp, boä chænh löu looing töï ñoäng…

(n) Toaøn boä coâng taùc sôn oáng gioù, heä thoáng ñöôøng oáng vaø thieát bò, v.v (o) Coâng taùc lieân ñôùi vôùi nhaø thaàu chính/ phuï nhö qui ñònh trong phaàn tieáp theo

veà ‘Coâng taùc lieân ñôùi‘ (p) Lieân heä vôùi cô quan chöùc naêng, hoaøn taát caùc thuû tuïc caàn thieát, ñoùng leä phí

cuõng nhö chuaån bò caùc baûn veõ trieån khai chi tieát thi coâng vaø caùc taøi lieäu caàn thieát khaùc ñeå ñeä trình cô quan chöùc naêng pheâ duyeät Hoà sô ñeä trình bao goàm nhöng khoâng giôùi haïn ôû nhöõng loaïi hoà sô sau: (i) Hoà sô heä thoáng thoâng gioù & ÑHKK ñeä trình Sôû caûnh saùt PCCC ñòa

phöông (ii) Giaáy chöùng nhaän hoaøn coâng laép ñaët heä thoáng ñieän coù lieân quan ñeán

coâng taùc laép ñaët heä thoáng MVAC (neáu caàn) theo yeâu caàu cuûa sôû ñieän löïc ñòa phöông

(iii) Cung caáp phuï tuøng döï tröø theo qui ñònh (q) Ñaøo taïo nhaân vieân cuûa chuû ñaàu tö caùch thöùc vaän haønh ñuùng toaøn boä heä

thoáng ñöôïc laép ñaët (r) Lieân heä, ñieàu phoái, hoã trôï kyõ thuaät/ giaùm saùt chuyeân gia thieát bò chiller trong

coâng taùc thöû nghieäm vaø nghieäm thu heä thoáng maùy laïnh trung taâm (s) Choïn loïc, laép ñaët vaø nghieäm thu maùy moùc, thieát bò bao goàm caû vieäc caùch ly

vaø xöû lyù aâm thanh nhaèm ñaït ñöôïc ñoä oàn thieát keá qui ñònh trong Quy phaïm kyõ thuaät naøy

(t) Toaøn boä coâng taùc xaây döïng coù lieân quan, tröø phi ñöôïc qui ñònh cuï theå trong Quy phaïm kyõ thuaät naøy. Coâng taùc bao goàm: (i) Hoaøn thieän, sôn (ii) Ron ngaên chaùy

(u) Thöû nghieäm, nghieäm thu, baûo trì vaø söûa loãi cho heä thoáng MVAC bao goàm: (i) Thôøi haïn chòu traùch nhieäm söûa chöõa laø 52 tuaàn tính töø ngaøy hoaøn coâng

cô baûn (ii) Cung caáp nhaân coâng, coâng cuï, vaät lieäu, phuï tuøng döï tröø ñeå thöïc hieän

coâng taùc baûo trì trong thôøi haïn chòu traùch nhieäm söûa chöõa (v) Cung caáp boán (04) cuoán soå tay vaän haønh vaø baûo trì bao goàm caùc baûn veõ

hoaøn coâng, thoâng tin veà thöû nghieäm vaø nghieäm thu

1.5 DANH MUÏC BAÛN VEÕ

Tham chieáu phuï luïc A.




2. PHOÁI HÔÏP VAØ COÂNG VIEÄC CUÛA NHÖÕNG NHAØ THAÀU KHAÙC

2.1 PHOÁI HÔÏP

Nhaø thaàu phuï seõ phoái hôïp vaø cung caáùp caùc thoâng tin caàn thieát theo yeâu caàu cuûa nhaø thaàu chính vaø nhaø thaàu phuï ñöôïc chæ ñònh ñeå tieán haønh coâng vieäc maø khoâng laøm chaäm treã tieán ñoä thi coâng.

Caùc coâng vieäc phaùt sinh maø nguyeân nhaân laø do khoâng coù hôïp taùc giöõa nhaø thaàu phuï vaø nhaø thaàu chính hay caùc nhaø thaàu phuï khaùc seõ khoâng ñöôïc coi laø phaàn phaùt sinh hôïp ñoàng hay laø cô sôû ñeå gia haïn theâm thôøi gian.

Nhaø thaàu chính seõ chòu traùch nhieäm kieåm tra caùc baûn veõ vaø thöông löôïng vôùi nhöõng nhaø thaàu phuï khaùc ñeå chænh söûa theo yeâu caàu neáu caàn.

2.2 COÂNG VIEÄC CUÛA NHÖÕNG NHAØ THAÀU KHAÙC

(a) Coâng vieäc xaây döïng cuûa nhaø thaàu chính

Nhaø thaàu chính seõ tieán haønh thöïc hieän nhöõng coâng vieäc xaây döïng sau:

(i) Caùc coät töôøng thieát bò beâ toâng vaø moùng beâtoâng trong phoøng maùy ñöôïc gaén vaøo taám saøn ôû nhöõng nôi yeâu caàu. Caùc coät töôøng vaø heä thoáng ñôõ beâ toâng coù hình daùng vaø kích thöôùc vaø nhöõng thoâng tin cho troïng löôïng hoaït ñoäng vaø phaân boá taûi troïng cho nhöõng phaàn khaùc nhau cuûa thieát bò nhö mieâu taû trong baûn veõ chi tieát do nhaø thaàu phuï cung caáp

(ii) Caùc neàn beâtoâng goàm khung theùp vaø cô caáu gia coá cho caùc maùy bôm nhö ñöôïc mieâu taû trong baûn veõ chi tieát do nhaø thaàu phuï cung caáp

(iii) Caùc maùi haét kieán truùc ñöôïc laép vaøo töôøng keát caáu beân ngoaøi, taàng treät vaø ôû treân (nhaø thaàu phuï seõ cung caáp kích thöôùc vaø vò trí, cuõng laø ngöôøi kieåm tra vaø xaùc nhaän lieäu maùi haét coù thích hôïp vôùi baûn veõ hay khoâng)

(iv) Ñoä thaám saâu toøa nhaø qua caùc phieán, daàm vaø töôøng caáu truùc vaø toøa nhaø trong caùc oáng ngoaøi, maët bích khoâng ngaám nöôùc vaø thieát bò giöõ ñinh vít ôû nhöõng nôi yeâu caàu xaây döïng trong quaù trình xaây döïng. Nhaø thaàu phuï seõ cung caáp caùc ñinh vít, oáng ngoaøi vaø maët bích khoâng ngaám nöôùc cuõng nhö caùc baûn veõ chi tieát ñònh vò chính xaùc nhöõng haïng muïc treân

(v) Nhaø thaàu phuï seõ haøn kín phaàn hình voøng giöõa oáng ngoaøi vaø caùc oáng/ oáng daãn vôùi vaät tö ñöôïc chaápthuaät ñeå coù ñoä choáng chaùy, choáng thaám, kín khí vaø/ hay haøng raøo aâm thanh neáu thích hôïp. Nhaø thaàu chính seõ haøn kín nhöõng khoaûng hôû giöõa oáng ngoaøi vaø caáu truùc hay caùc phaàn toøa nhaø

(vi) Caùc cöûa saäp, cöûa ñi vaø caùc taám baûng do nhaø thaàu phuï aán ñònh vaø theo caùc chi tieát nhö yeâu caàu treân traàn giaû, taám neà, phoøng maùy vaø nhöõng vò trí khaùc theo yeâu caàu cho pheùp tieáp caän ñeå ñieàu chænh, baûo trì vaø laøm veä sinh

(vii) Nhöõng coâng vieäc caét, ñaép vaù, laøm khung, caïo caùu caën, caét ren vaø söûa chöõa keát hôïp vôùi vieäc xaây döïng ñeå thoâng heä thoáng oáng daãn, heä thoáng oáng, daây caùp vaø nhöõng coâng vieäc töông töï. Caùc baûn veõ chi tieát seõ do nhaø thaàu phuï cung caáp




(viii) Caùc taám kim loaïi ngaên nöôùc ôû döôùi maùi nhaø cho daây caùp, heä thoáng oáng, oáng daãn

(ix) Caùc tieän nghi coâng trình goàm nguoàn cung caáp nöôùc vaø chieáu saùng taïm thôøi ñeå chieáu saùng, hoaït ñoäng cuûa caùc thieát bò ñieän vaø ñeå kieåm tra, chuyeån giao vaø baûo trì cuõng nhöõ vieäc nghieäm thu laép ñaët MVAC cuoái cuøng cuûa nhaø tö vaán/ ngöôøi uûy nhieäm. Nhaø thaàu phuï ñöôïc cho raèng ñaõ ghi nhaän nhöõng ñieàu khoaûn naøy vaø phaûi thöïc hieän nhöõng yeâu caàu phaùt sinh naøo maø khoâng ñöôïc neâu trong taøi lieäu naøy

(x) Pheãu thoaùt saøn vaø/ hay ñieåm noái oáng daãn trong phoøng maùy, mieäng coáng vaø khu vöïc caùc thieát bò ñöôïc neâu trong baûn veõ chi tieát

(xi) Nhaø thaàu phuï seõ cung caáp vaø laép ñaët caùc ñöôøng oáng nöôùc noái töø thieát bò MVAC vaø thieát bò oáng nöôùc cho nhöõng ñieåm noái oáng nöôùc naøy thaäm chí ôû nhöõng nôi khoâng theå hieän chi tieát trong baûn veõ döï thaàu

(xii) Nhaø thaàu phuï seõ noäp caùc thoâng tin caàn thieát, tieán ñoä vaø toaøn boä nhöõng baûn veõ kích thöôùc theå hieän chi tieát coâng vieäc xaây döïng theo yeâu caàu coù lieân quan ñeán coâng vieäc thaàu phuï cho nhaø thaàu chính. Phaûi noäp trong thôøi gian hôïp lyù ñeå nhaø thaàu chính ñeä trình tö vaán pheâ duyeät vaø nhaø thaàu chính coù theå keát hôïp thöïc hieän caùc loã, raõnh vaø nhöõng vieäc töông töï trong coâng vieäc xaây döïng keát caáu khi coâng vieäc ñöôïc tieán haønh ñeå khoâng phaûi tieán haønh caét sau ñoù

(xiii) Nhaø thaàu phuï seõ cung caáp cho nhaø thaàu chính caùc vaät tö caáu truùc nhö oáng ngoaøi, ñinh neo vaø caùc haïng muïc töông töï tröôùc khi tieán haønh coâng vieäc ñeå nhaø thaàu chính coù theå thöïc hieän ñuùc nhöõng haïng muïc naøy

(xiv) Nhaø thaàu phuï seõ giaùm saùt taïi coâng trình ñeå ñaûm baûo raèng caùc coâng vieäc cuûa thôï xaây döïng ñöôïc thöïc hieän theo yeâu caàu cuûa nhaø thaàu phuï vaø theo söï pheâ duyeät cuûa kieán truùc sö. Baát cöù nhöõng vaán ñeà naøo khoâng theo yeâu caàu cuûa anh ta seõ ñöôïc trình leân nhaø thaàu chính, laø ngöôøi seõ chænh söûa/ thay ñoåi neáu caàn

(b) Coâng vieäc ñieän do nhaø thaàu phuï ñieän thöïc hieän

Nhöõng haïng muïc sau seõ do nhaø thaàu phuï ñieän cung caáp keát hôïp vôùi vieäc laép ñaët MVAC:

(i) Tuû nguoàn (MSSB) nhö theå hieän trong baûn veõ ñieän (ii) Daây caùp cung caáp ñieän töø tuû MSB ñeán tuû MSSB. Nhaø thaàuphuï ñieän seõ

cung caáp caùp cung caáp ñieän vaøo ñeán tuû MSSB. Caùc tuyeán caùp ra töø tuû MSSB ñeán thieát bò seõ do nhaø thaàu phuï MVAC thöïc hieän

(iii) Nguoàn ñieän ñeán caùc quaït thoâng gioù nhoû baèng caùc thieát bò noái caàu chì coâng taéc

(iv) Nguoàn ñieän ñeán FCU baèng caùc thieát bò noái caàu chì coâng taéc (v) Coâng taéc ñôn laäp 30A 1φ (nguoàn ñieän caàn thieát) trong phoøng MSSB

cho loø daàu maùy laøm nguoäi (vi) Moät caàu chì 13A (nguoàn ñieän caàn thieát) trong töøng PAU, AHU cho traïm

ôû xa DDC (vii) Nguoàn ñieän ñeán caùc bôm kín chaïy baèng cô (viii) Ñaàu ra GPO cho DDC




(ix) Heä thoáng chieáu saùng phoøng maùy vaø ñaàu ra nguoàn ñieän chung

Nhaø thaàu phuï seõ cung caáp vaø laép ñaët caùc daây ñieän vaø daây ñieàu khieån töø caùc coâng taéc ñeán caùc baûn khôûi ñoäng vaø ñoäng cô cuûa thieát bò MVAC

Ñieåm noái caùc daây ñieän töø ñieåm tieáp xuùc khoâ cho thieát bò hieån thò töø xa cuûa thieát bò MVAC seõ do nhaø thaàu phuï cung caáp

(c) Coâng taùc caáp thoaùt nöôùc cuûa nhaø thaàu phuï caáp thoaùt nöôùc

(i) Caùc pheãu thu saøn nhaø hay gaøu chuyeân ñeán caùc cuoän laøm nguoäi, maùy bôm, loã xuyeân maùi vaø ñieåm thaáp nhaát trong phoøng maùy

(ii) Nguoàn nöôùc laïnh ngaét van caùch ñieän gaàn thuøng naïp lieäu vaø thuøng giaõn nôû

(iii) OÁng daãn xöû lyù aâm töø phoøng maùy xuoáng khu vöïc coù söû duïng

(d) Coâng vieäc phoøng chaùy chöõa chaùy cuûa nhaø thaàu phuï phoøng chaùy chöõa chaùy

(i) Voøng ñònh möùc chöõa chaùy (ii) Moâñun maët phaân giôùi gaàn MSSB vaø ñöôïc noái vôùi voøng. Moâñun keát hôïp

vôùi role khoâng voân ñaàu vaøo vaø ñaàu ra ñöôïc noái vôùi maùy ñieàu khieån vaø quan saùt baèng cô trong traïng thaùi chaùy. Nhaø thaàu phuï seõ cung caáp vaø laép ñaët daây caùp tín hieäu chaùy töø MSSB ñeán moâñun maët phaân giôùi. Ñieåm döøng cuoái cuøng ñeán moâñun maët phaân giôùi do nhaø thaàu phuï chöõa chaùy thöïc hieän

(iii) Coâng taéc ñieàu khieån baèng tay vaø vaät hieån thò tình traïng treân baûn ñieàu khieån chaùy cho caùc maùy cô yeâu caàu hoaït ñoäng trong traïng thaùi chaùy

(iv) Nhaø thaàu phuï chöõa chaùy vaø nhaø thaàu phuï seõ phoái hôïp vôùi nhau trong caùc yeâu caàu phoái hôïp




3. YEÂU CAÀU CUÏ THEÅ CUÛA DÖÏ AÙN

3.1 YEÂU CAÀU THIEÁT KEÁ

Heä thoáng ÑHKK vaø thoâng thoaùng cô ñöôïc thieát keá theo tieâu chuaån sau:

(a) Heä thoáng ÑHKK: (i) Ñòa ñieåm xaây döïng

● Ñòa ñieåm: TP. Nha Trang ● Vó ñoä: 11o42’ N - 12o52’ N ● Kinh ñoä: 108o40’ E - 109o27’ E ● Cao ñoä so vôùi möïc nöôùc bieån: ..... m

(ii) Nhieät ñoä khoâng khí ngoaøi trôøi ● Baàu khoâ vaøo muøa heø: 37oC ● Baàu aåm vaøo muøa heø: 29.0oC ● Nhieät ñoä thay ñoåi haøng ngaøy: 11.0oC ● Thieát keá: Thaùng 04 hoaëc thaùng 05

(iii) Nhieät ñoä khoâng khí trong khu vöïc coù ÑHKK ● Vaên phoøng: 25oC ± 2oC & 60%RH ± 5%RH ● Phoøng hoäi thaûo: 25oC ± 2oC & 60%RH ± 5%RH ● Phoøng đoïc: 25oC ± 2oC & 60%RH ± 5%RH ● Saûnh/ haøng lang: 26oC ± 2oC & 60%RH ± 5%RH

(iv) Khí töôi: ● Vaên phoøng: 8.0 L/giaây/ ngöôøi ● Phoøng hoäi thaûo: 4.5 L/giaây/ ngöôøi ● Phoøng đoïc: 4.5 L/giaây/ ngöôøi ● Phoøng nguû : 25 L/ giaây/ caên hoä

(v) Maät ñoä söû duïng ● Vaên phoøng: 8.0 m2 / ngöôøi ● Phoøng hoäi thaûo: 2.0 m2 / ngöôøi ● Phoøng ñoïc: 1.5 m2 / ngöôøi ● Phoøng nguû: 1-2 ngöôøi / phoøng nguû

(vi) Chieáu saùng vaø thieát bò ● Vaên phoøng: Chieáu saùng: 25 W/m2, Thieát bò: 35 W/m2 ● Phoøng hoäi thaûo: Chieáu saùng: 20 W/m2, Thieát bò: 10 W/m2 ● Phoøng ñoïc: Chieáu saùng: 20 W/m2, Thieát bò: 10 W/m2 ● Saûnh/ haønh lang: Chieáu saùng: 15 W/m2, Thieát bò: 10 W/m2 ● Phoøng nguû: Chieáu saùng: 20 W/m2, Thieát bò: 10 W/m2




(b) Thoâng gioù

● Thoâng gioù nhaø veä sinh:

khu vöïc nhaø veä sinh cao hôn 6AC/H hay 25L/s/ cho nhöõng thieát bò laép coá ñònh hay 10L/s/m2 saøn

● Thoâng gioù phoøng maùy:

Theo tieâu chuaån AS 1668.2

(c) Möùc ñoä oàn

Tieáng oàn töø thieát bò MVAC khoâng coù aâm thanh vaø chöùa quang phoå vaø seõ khoâng vöôït quaù möùc sau ñaây khi ño ôû khoaûng caùch 1.2m treân möùc saøn vaø 1.5m töø baát kyø oáng daãn, tuû hay töôøng phoøng maùy naøo. Tieâu chuaån möùc ñoä oàn lieân tuïc ñöôïc theå hieän trong phaàn tieâu chuaån tieáng oàn (NC) vaø ñöôïc ño trong quaõng 63Hz ñeán 8KHz.

● Vaên phoøng: NC 30 – 35

● Phoøng hoäi thaûo: NC 30 – 35

● Phoøng ñoïc: NC 25 – 30

● Khu vöïc coâng coäng: NC 35 – 40

● Khu khaùch saïn NC 25 – 30

Neáu coù moät phaïm vi neâu leân, möùc ñoä thaáp hôn seõ ñöôïc söû duïng nhö moät muïc tieâu thieát keá. Möùc ñoä cao hôn theå hieän möùc ñoä cho pheùp toái ña treân coâng trình.




4. CAÙC YEÂU CAÀU CHUNG

4.1 KIEÅM TRA COÂNG TRÖÔØNG

Caùc nhaø döï thaàu phaûi kieåm tra tình traïng coâng tröôøng tröôùc khi ñeä trình hoà sô thaàu. Vieäc kieåm tra coâng tröôøng caàn ñöôïc xaùc nhaän vaø ñeä trình trong hoà sô thaàu

4.2 CAÙC YEÂU CAÀU VAØ TIEÂU CHUAÅN BAÉT BUOÄC

Aùp duïng tieâu chuaån cuûa Myõ ñang hieän haønh taïi thôøi ñieåm döï thaàu. Caùc tieâu chuaån trong baûng keâ döôùi ñaây coù theå aùp duïng ñöôïc ñoái vôùi caùc loaïi vaät tö.

Aùp duïng tieâu chuaån cuûa Anh trong tröôøng hôïp tieâu chuaån Myõ khoâng phuø hôïp. Neáu Quy phaïm kyõ thuaät naøy ñoøi hoûi tieâu chuaån cao hôn nhöõng tieâu chuaån töông öùng, phaûi tuaân theo yeâu caàu neâu trong Quy phaïm kyõ thuaät naøy.

Tö vaán nhöõng söûa ñoåi sau ñoù cuûa caùc tieâu chuaån aùp duïng vaø xin chæ ñaïo ñeå aùp duïng nhöõng söûa ñoåi trong boä tieâu chuaån cho coâng trình.

Moïi coâng vieäc caàn phaûi tuaân thuû:

● Quy ñònh cuûa cô quan xaây döïng ñòa phöông ● Qui ñònh cuûa cô quan ñieän löïc ñòa phöông ● Qui ñònh cuûa cô quan moâi tröôøng ñòa phöông ● Qui ñònh cuûa cô quan PCCC ñòa phöông ● Caùc tieâu chuaån Anh/ UÙc töông öùng

4.3 CHEÁ ÑOÄ BAÛO HAØNH

Vieäc baûo haønh neâu trong qui phaïm kyõ thuaät naøy laø nhöõng yeâu caàu boå sung theâm ngoaøi caùc quy ñònh laép ñaët hieän haønh.

4.4 ÑAËC TÍNH KYÕ THUAÄT VAØ BAÛN VEÕ

Danh saùch Baûn veõ ñöôïc ñính keøm ôû phaàn phuï luïc A.

Quy phaïm kyõ thuaät vaø baûn veõ boå sung laãn nhau. Moïi coâng vieäc duø ñöôïc qui ñònh trong quy phaïm kyõ thuaät maø khoâng ñöôïc theå hieän treân baûn veõ cuõng phaûi ñöôïc tieán haønh troïn veïn.

Kích thöôùc treân baûn veõ chæ laø kích thöôùc gaàn ñuùng. Nhaø thaàu phuï phaûi xaùc ñònh kích thöôùc thöïc teá.

Nhaø thaàu phuï chòu traùch nhieäm xem xeùt kích thöôùc cuûa moïi thieát bò vaø xaùc ñònh khoaûng troáng caàn thieát ñeå baûo ñaûm vieäc laép raùp vaø baûo trì thieát bò ñöôïc thuaän tieän, deã daøng.

4.5 CAÙC MAÂU THUAÃN VAØ THIEÁU SOÙT

Khi treân baûn veõ hoaëc trong quy phaïm kyõ thuaät coù nhöõng maâu thuaãn hoaëc thieáu soùt, Nhaø thaàu phaûi lieân heä vôùi Quaûn lyù Döï aùn vaø Nhaø Tö vaán ñeå coù phöông aùn giaûi quyeát tröôùc khi ñeä trình hoà sô thaàu. Caùc vaán ñeà neâu treân seõ ñöôïc Nhaø Tö vaán giaûi quyeát baèng vaên baûn. Moïi söï söû ñoåi veà quy phaïm kyõ thuaät khoâng theå hieän treân vaên baûn ñeàu khoâng coù giaù trò.




4.6 THI COÂNG CAÙC LOÃ MÔÛ Vò trí chính xaùc cuûa caùc loã môû vaø caùc haïng muïc töông töï do nhaø thaàu chính cung caáp phaûi ñöôïc xaùc ñònh sao cho coâng vieäc khoâng bò ñình treä. Moïi haïng muïc ñeàu phaûi ñöôïc kieåm tra ñeå baûo ñaûm vò trí cuûa chuùng ñöôïc chính xaùc. Trong tröôøng hôïp caùc loã môû vaø caùc haïng muïc töông töï ñaët sai vò trí hoaëc bò boû soùt do thieáu thoâng tin hoaëc do thoâng tin sai, nhaø thaàu phuï coù traùch nhieäm hoaøn traû chi phí cho vieäc söûa chöõa laïi. Vò trí caùc loã môû ra beân ngoaøi khoâng ñöôïc xaùc ñònh chính xaùc treân baûn ve thieát keá kyõ thuaätõ. Vò trí chính xaùc cuûa noù caàn phaûi ñöôïc xaùc ñònh chính xaùc treân coâng tröôøng hoaëc treân baûn veõ thi coâng. Caùc raõnh ñaët oáng nöôùc, hoác töôøng, caùc vò trí xuyeân qua keát caáu xaây döïng khoâng theå hieän treân baûn veõ keát caáu ñeàu phaûi ñöôïc pheâ duyeät.

4.7 VÒ TRÍ THIEÁT BÒ Sô ñoà cuûa caùc chi tieát neâu ra trong baûn veõ chæ ñöôïc xem nhö laø sô ñoà vò trí ñieån hình, coøn vò trí chính xaùc thöïc teá seõ ñöôïc xaùc ñònh ngay treân coâng tröôøng. Kieán truùc sö hoaëc tö vaán phaûi laø ngöôøi cho quyeát ñònh pheâ duyeät cuoái cuøng trong vieäc ñònh vò. Phaûi ñaûm baûo raèng taát caû nhöõng maùy moùc thieát bò phaûi thích hôïp cho vieäc laép ñaët theo vò trí vaø khoâng gian trình baøy trong baûn veõ vaø thuaän tieän cho coâng taùc baûo trì theo nhö chæ daãn laép ñaët cuûa nhaø saûn xuaát. Thieát bò seõ ñöôïc ñònh vò ñoái xöùng theo caùc trang thieát bò khaùc, theo moâ-ñun coâng trình vaø trang trí.

4.8 PHOÁI HÔÏP TRONG LAÉP ÑAËT Phaûi phoái hôïp coâng vieäc laép ñaët caùc haïng muïc treân traàn giaû sao cho phuø hôïp vôùi tieán ñoä chung cuûa nhaø thaàu chính. Moïi vieäc beân trong traàn giaû phaûi ñöôïc laép ñaët hoaøn taát ñeå traùnh tình traïng phaûi thaùo traàn sau naøy, ngoaïi tröø khi thöû nghieäm vaø vaän haønh. Nhaø thaàu phaûi chòu chi phí neáu coù nhöõng chaäm treã hoaëc thöïc hieän khoâng ñaày ñuû hôïp ñoàng naøy. Taám traàn phaûi ñöôïc dôõ boû vaø thay theá hoaëc cung caáp theâm nhöõng loã môû trong traàn.

4.9 COÂNG TAÙC THI COÂNG VAØ BAÛO HAØNH

Nhaø thaàu coù traùch nhieäm baûo haønh nhö sau: ● Caùc thieát bò do nhaø thaàu cung caáp - loaïi hieän ñaïi nhaát, ñuùng thieát keá vaø ñuû

coâng suaát ● Caùc thieát bò laép ñaët phaûi ñöôïc theå hieän treân baûn veõ vôùi nhöõng khoaûng

troáng phuø hôïp vôùi hoaït ñoäng cuûa noù cuõng nhö vieäc duy tu, baûo döôõng ● Ñoä oàn cuûa thieát bò khoâng vöôït quaù qui ñònh trong qui phaïm kyõ thuaät ● Caùc thieát bò cung caáp coâng suaát toái thieåu taïi caùc vò trí ghi trong Quy phaïm

kyõ thuaät hoaëc treân baûn veõ õ ● Heä thoáng phaân phoái gioù phaûi caân baèng trong khoaûng ± 5% so vôùi khoái

löôïng qui ñònh ● Nhaø thaàu phuï coù traùch nhieäm veà moïi thoâng soá caøi ñaët cuûa caùc trang thieát

bò ñieàu khieån nhaèm baûo ñaûm caùc yeâu caàu vaø ñieàu kieän hoaït ñoäng




● Thieát bò do nhaø thaàu phuï cung caáp phaûi luoân luoân duy trì nhieät ñoä trong phaïm vi thieát keá cho pheùp maëc duø nhieät ñoä beân ngoaøi thay ñoåi

4.10 BAÛN VEÕ TRIEÅN KHAI CHI TIEÁT THI COÂNG Nhaø thaàu phuï seõ chuaån bò caùc baûn veõ caàn thieát cho vieäc laép ñaët. Caùc baûn veõ phaûi ñöôïc ñeä trình tö vaán pheâ duyeät tröôùc khi tieán haønh baát kyø coâng vieäc naøo. Nhaø tö vaán seõ tieán haønh kieåm tra vaø pheâ duyeät caùc baûn veõ vôùi söï trôï giuùp mieãn phí cuûa nhaø thaàu phuï vaø khoâng laøm giaûm baát kyø traùch nhieäm veà sai soùt hay thieát soùt naøo cuûa nhaø thaàu phuï. Nhaø thaàu phuï seõ tieán haønh söûa chöõa caùc thieát soùt hay sai soùt ñöôïc phaùt hieän sau ñoù maø khoâng ñuùng vôùi söï pheâ duyeät cuûa nhaø tö vaán. Pheâ duyeät baûn veõ khoâng ñöôïc hieåu nhö laø moät coâng vieäc phaùt sinh hay chi phí phaùt sinh cho chuû nhaân/ khaùch haøng/ ngöôøi uûy nhieäm. Tröôøng hôïp baûn veõ theå hieän nhöõng coâng vieäc phaùt sinh lieân quan ñeán vieäc taêng chi phí, nhaø thaàu phuï seõ thoâng baùo cho nhaø tö vaán khi noäp baûn veõ.

4.11 BAÛN VEÕ HOAØN COÂNG Ngay khi tieán haønh thi coâng, nhaø thaàu phuï phaûi cöû hoïa vieân gioûi löu giöõ moïi thay ñoåi so vôùi hôïp ñoàng vaø baûn veõ thi coâng, ñoàng thôøi ñaùnh daáu caùc thay ñoåi ñoù chính xaùc nhö thöïc teá laép ñaët. Trong suoát quaù trình thi coâng, nhaø thaàu phuï phaûi trình cho Tö vaán pheâ duyeät baûn veõ trong ñoù chæ roõ thöïc teá laép ñaët, vaø göûi cho caùc boä phaän coù lieân quan. Ngoaøi ra, nhaø thaàu phuï cuõng phaûi cung caáp caùc bieåu ñoà, baûng lieät keâ thieát bò, ñöôøng oáng, phuï kieän vaø moïi thoâng tin chính xaùc lieân quan ñeán thöïc teá laép ñaët. Nhaø thaàu phuï caàn löu giöõ baûn sao caùc baûn veõ hoaøn coâng vaø caùc baûng keâ noùi treân ñeå söû duïng trong quaù trình söûa chöõa sai soùt, hoaøn thieän coâng trình.

4.12 SÖÏ KHOÂNG CHUAÅN XAÙC CUÛA THIEÁT BÒ Kích thöôùc vaø naêng suaát cuûa thieát bò ñaõ chæ ñònh roõ treân baûn veõ phaûi phuø hôïp vôùi soá lieäu do nhaø saûn xuaát cung caáp. Tröôøng hôïp nhaø thaàu phuï coù yù ñònh söû duïng loaïi thieát bò khaùc so vôùi baûn veõ hoaëc taøi lieäu kyõ thuaät cuûa hôïp ñoàng thì phaûi göûi vaên baûn ñeán Nhaø Tö vaán vaø chôø pheâ duyeät tröôùc khi thöïc hieän. Nhöõng choã khoâng chuaån xaùc cuûa thieát bò ñöôïc pheâ duyeät yeâu caàu veà soá löôïng vaø caùch boá trí vaät lieäu keát caáu hay kieán truùc khaùc nhau, hay soá löôïng vaø caùch boá trí daây, oáng ñieän khaùc nhau vaø thieát bò ñöôïc chæ ñònh roõ hay theå hieän trong baûn veõ thí nhaø thaàu phuï phaûi cung caáp vaø laép ñaët giaù ñôõ thuoäc caáu truùc theâm vaøo, caùch nhieät, boä ñieàu chænh, moâ tô, boä khôûi ñoäng, daây vaø oáng ñieän vaø caû thieát bò, vaät lieäu theâm khaùc nöõa caàn thieát cho söï khoâng chuaån xaùc naøy. Caùc thieát bò vaø vaät lieäu thay theá phaûi tuaân thuû möùc ñoä aâm thanh toái ña, ñoä thaát thoaùt vaø ñoä huùt toái thieåu ôû möùc aùp suaát ñaõ neâu. Neáu aâm thanh vöôït quaù möùc qui ñònh, nhaø thaàu phaûi chòu chi phí xöû lyù aâm thanh ñeå ñaùp öùng tieâu chuaån veà ñoä oàn vaø ñoä rung cho pheùp.

4.13 THIEÁT BÒ NGUYEÂN CUÏM Caùc thieát bò nguyeân cuïm coù ñaëc tính kyõ thuaät khoâng phuø hôïp vôùi yeâu caàu quy phaïm kyõ thuaät phaûi ñöôïc nhaø saûn xuaát söûa ñoåi laïi cho phuø hôïp. Moïi söï söûa ñoåi phaûi ñöôïc nhaø saûn xuaát chaáp nhaän vaø thieát bò ñöôïc söûa ñoåi phaûi ñöôïc nhaø saûn xuaát baûo haønh.




Duø nhaø thaàu coù cung caáp thieát bò nguyeân cuïm theo nhaõn hieäu rieâng bieät naøo thì cuõng phaûi söûa ñoåi cho phuø hôïp vôùi quy phaïm kyõ thuaät.




4.14 MAÃU VAÄT TÖ Maãu vaät tö vaø caùc haïng muïc coù yeâu caàu pheâ duyeät phaûi mang ñeán coâng tröôøng tröôùc khi coù yeâu caàu pheâ duyeät ít nhaát 15 ngaøy. Moãi haïng muïc phaûi coù 2 maãu treân ñoù coù ghi roõ teân nhaø cung caáp vaø maõ hieäu. Moät maãu ñöôïc löu giöõ taïi coâng tröôøng, maãu coøn laïi seõ ñöôïc göûi cho nhaø saûn xuaát sau khi ñöôïc Nhaø Tö vaán xem xeùt vaø chuù thích. Nhöõng maãu ñöôïc chaáp thuaän seõ ñöôïc ghi roõ noäi dung sau:

● Ngaøy chaáp thuaän ● Ngöôøi duyeät chaáp thuaän

Caùc maãu phuï kieän vaø chi tieát keøm theo thieát bò phaûi ñöôïc Nhaø Tö vaán chaáp thuaän tröôùc khi laép ñaët goàm:

● Caùc loaïi mieäng gioù ● Caûm bieán nhieät ● Van ● Vaät lieäu caùch nhieät. ● Vaät lieäu oáng vaø phuï kieän ● OÁng daãn vaø caùp

Nhaø thaàu phuï coù traùch nhieäm saép xeáp vieäc trình duyeät maãu vaø göûi cho Nhaù Tö vaán baèng vaên baûn. Caùc maãu ñöôïc chaáp thuaän seõ ñöôïc löu giöõ taïi coâng tröôøng cho ñeán khi hoaøn taát coâng vieäc. Moïi vaät tö khi söû duïng phaûi ñöôïc xaùc nhaän phuø hôïp vôùi maãu ñaõ duyeät. Nhaø Tö vaán coù quyeàn tieán haønh kieåm tra, phaân tích baát cöù luùc naøo ñoái vôùi moïi vaät tö mang ñeán ñeå laép ñaët treân coâng tröôøng. Ngoaøi vieäc trình duyeät maãu nhö ñaõ trình baøy ôû treân, Nhaø thaàu chính phaûi xaùc ñònh thöù töï öu tieân hoaøn thaønh cuûa töøng khu vöïc nhaèm baûo ñaûm phoái hôïp toát vaø hoaøn taát moïi coâng vieäc cuûa töøng khu vöïc. Treân tinh thaàn ñoù, nhaø thaàu chính seõ chæ ñaïo, saép xeáp thöù töï vieäc trình duyeät maãu vaø laép ñaët cho töøng khu vöïc.

4.15 SÖÏ GIAO THOA VOÂ TUYEÁN Taát caû caùc thieát bò vaø/hoaëc ñoà duøng ñieän cung caáp theo quy phaïm kyõ thuaät naøy phaûi ñöôïc thieát keá sao cho khoâng coù söï giao thoa voâ tuyeán naøo hoaëc khoâng coù söï truyeàn ñieän hay tieáp nhaän thieát bò trong cuøng moät vò trí. Trong tröôøng hôïp ñaëc tình voán coù cuûa coâng taùc thi coâng ñieän chaáp nhaän tính giao thoa nhö theá laø hôïp lyù thì nhaø thaàu phaûi laép caùc thieát bò coù hieäu suaát cao hoaëc thieát bò coù khaû naêng loai tröø söï giao thoa baèng chi phí cuøa nhaø thaàu. Xaùc ñònh khu vöïc deã bò aønh höôûng cuûa söï giao thoa tröôùc khi ñaët mua thieát bò vaø ñoà duøng ñieän, vaø thoâng baùo cho tö vaán phöông thöùc nhaèm laøm giaûm söï giao thoa.

4.16 DAÙN NHAÕN Caùc PAU, FCU, maùy bôm, quaït, van ñieàu khieån, oáng nöôùc laïnh, oáng nöôùc ngöng tuï, coâng taéc, caàu chì, role, thieát bò ñaàu cuoái, thieát bò ngaét maïch vaø caùc ngaên phaûi ñöôïc daùn nhaõn ñeå chæ roõ chöùc naêng. Caùc nhaõ laøm baèng vaät lieäu Sandwich Ivorine hay Traffolyte, chöõ traéng vôùi ñen cho ñieän bình thöôøng vaø chöõ traéng vôùi ñoû cho ñieän döï phoøng.




Nhaõn ñöôïc gaén chaéc chaén vaøo caùc phaàn coá ñònh baèng choát hay chaát dính. Khoâng ñöôïc söû duïng baêng töï dính. Ñeä trình keá hoaïch daùn nhaõn ñeå pheâ duyeät tröôùc khi saûn xuaát.

4.17 TAY NGHEÀ VAØ VAÄT LIEÄU Nhaø thaàu phaûi cung caàp lao ñoäng coù tay ngheà vaø chuyeân gia caàn thieát ñeå thöïc hieän coâng vieäc theo caùch toát nhaát coù theà. Chaát löôïng tay ngheà phaøi gioûi nhaát vaø phuø hôïp theo tieâu chuaån cao nhaát veà ngheà nghieäp töông öùng. Tay ngheà keùm hoaëc vôùi moät chuaån khoâng theå chaáp nhaän ñöôïc thì seõ bò tö vaán töø choái vaø nhaø thaàu seõ phaûi thay theá baèng nhaân coâng coù tay ngheà khaùc ñaùp öùng theo yeâu caàu maø chuû ñaàu tö khoâng phaûi chòu chi phí phaùt sinh theâm. Taát caû vaät lieäu, phuï kieän, linh kieän vaø duïng cuï phaûi laø loaïi thieát keá vaø saøn xuaát haïng nhaát vaø tuaân theo tieâu chuaån kyõ thuaät Anh/Uùc coù lieân quan. Taát caû vaät lieäu, phuï kieän, linh kieän vaø duïng cuï phaûi môùi vaø phaûi laø loaïi coù kieåu daùng phoå bieán hieän haønh ngoaïi tröø coù yeâu caàu ñaëc bieät khaùc. Nhaø thaàu phaûi ñeä trình leân tö vaàn duyeät tröôùc khi thi coâng danh saùch taát caû caùc linh kieän, phuï kieän, duïng cuï ñaõ ñöôïc ñeà suaát thi coâng coâng vieäc. Vaø chæ thi coâng nhöõng haïng muïc naøo ñaõ ñöôïc pheâ duyeät. Khoâng tuaân thuû theo ñieàu khoaûn naøy thi seõ ñöôïc lieät vaøo danh muïc töø choái voâ ñieäu kieän khi tö vaán kieåm tra treân coâng tröôøng. Caùc vaät tö maãu ñaõ ñöôïc tö vaán pheâ duyeät thì môùi giöõ laïi thi coâng treân coâng tröôøng. Moãi danh muïc caùc thieát bò phaûi laø loaïi saûn phaåm do nhaø saûn xuaát coù tieâu chuaãn saûn xuaát ñöôïc chaáp nhaän. Taát caû caùc thieát bò töông töï phaûi cuøng nhaø cheá taïo, cuøng loaïi, cuøng hoøan thieän, ngoaïi tröø khi coù yeâu caàu ñaëc bieät khaùc. Noùi chung, maõ soá vaø chuûng loaïi catalogue cuûa nhaø saûn xuaát ghi trong baûn veõ chæ mang tính höôùng daãn vaø khoâng thay theá nhöõng thoâng soá hieäu suaát cô baûn ñöôïc qui ñònh. Trong moïi tröôøng hôïp, phaûi xaùc ñònh thoâng soá vaø ñaëc tröng cuûa thieát bò vaø ñeä trình pheâ duyeät. Choã naøo vaät lieäu khoâng theå thay theá ñöôïc ghi chuù trong quy phaïm kyõ thuaät hay treân baûn veõ vaø khoâng thaáy xuaát hieän caùc töø nhö “töông ñöông” hoaëc “chaáp nhaän töông ñöông”,v.v. thì phaûi cung caáp vaø laép ñaët chính xaùc theo nhö yeâu caàu. Khoâng chaáp nhaän thay theà danh muïc caùc nhaø saûn xuaát vaø cung caáp do nhaø thaàu ñaõ ñeä trình trong hoà sô ñaáu thaáu maø khoâng coù söï ñoàng yù baèng vaên baûn cuûa tö vaán. Khi nhaø thaàu laép ñaët vaät lieäu vaø/hoaëc thieát bò khaùc vôùi danh muïc ñaõ ñöôïc pheâ duyeät veà nhaø saûn xuaát vaø cung caáp thì seõ bò töø choùi laép ñaët treân coâng tröôøng. Taát caû caùc danh muïc bò loaïi boû ñoù phaûi ñöôïc di chuyeån ra khoûi coâng tröôøng caøng sôùm caøng toát vaø phaûi ñöôïc thay theá vaät tö khaùc ñöôïc pheâ duyeät maø chuû ñaàu tö khoâng phaûi traû theâm chi phí phaùt sinh. Vieäc thay theá caùc haïng muïc ñoù seõ khoâng ñöôïc tính theâm chi phí phaùt sinh vaø khoâng ñöôïc keùo daøi thôøi gian. Nhaø thaàu phaûi thaät caån thaän nhaèm traùnh hö haïi ñeán caùc phuï kieän, beà maët, maùy moùc vaø nhöõng thieät haïi do coâng nhaân hay trong quaù trình thi coâng gaây ra. Nhaø thaàu phaûi coù traùch nhieäm baûo quaûn vaø giuõ gìn toát baèng chi phí cuûa nhaø thaàu.

4.18 BOÁ TRÍ




Nhaø thaàu phuï seõ boá trí caùc phaïm vi vaø möùc ñoä coâng vieäc cuõng nhö tham khaûo vôùi nhaø thaàu chính ñeå ñöôïc pheâ duyeät vaø tuaân theo caùc höôùng daãn cuûa nhaø thaàu chính veà nhöõng söûa ñoåi caàn thieát ñeå phoái hôïp coâng vieäc. Vò trí caùc thieát bò nhö theå hieän trong baûn veõ döï thaàu ñöôïc coi laø gaàn ñuùng vaø chæ mang tính ñieån hình vaø khoâng söû duïng nhöõng baûn veõ naøy nhö baûn veõ boá trí cuoái cuøng Nhaø thaàu phuï seõ kieåm tra kyõ löôõng nhöõng thoâng soá kyõ thuaät vaø baûn veõ döï thaàu, kieåm tra caùc kích thöôùc ngay sau khi nhaø thaàu phuï ñöôïc giao thaàu vaø thöïc hieän ño ñaïc cuõng nhö coù ñöôïc nhöõng thoâng tin maø coù theå ñöôïc yeâu caàu ñeå thöïc hieän coâng vieäc.

4.19 ÑEÀ PHOØNG TRONG QUAÙ TRÌNH THI COÂNG Tieâu chuaån hieän haønh cuûa UÙc/ Anh thích hôïp cho vieäc löu tröõ, vaän chuyeån vaø söû duïng vaät lieäu, maùy moùc , thieát bò, quy trình laøm vieäc hoaëc nhöõng ñieàu khoaûn veà an toaøn, tieâu chuaån naøy phaûi ñöôïc aùp duïng, ngoaïi tröø noù traùi vôùi nhöõng quy ñònh cuûa phaùp luaät hoaëc nhöõng yeâu caàu ñaëc bieät cuûa cô quan nhaø nöôùc coù thaåm quyeàn. Trong tröôøng hôïp ñoù phaûi xin pheùp sau. Trong tröôøng hôïp thieáu caùc yeâu caàu do phaùp luaät qui ñònh hay caùc yeâu caàu ñaëc bieät hoaëc tieâu chuaån Uùc coøn hieäu löïc, thì Nhaø thaàu phaûi ñaûm baûo aùp duïng caùc thuû tuïc thích hôïp vaø caân nhaéc caån thaän. Trong quaù trình thi coâng, doïn deïp taát caû caùc thieát bò dang dôû ôû moät nôi an toaøn vaø baûo veä thieát bò khoâng bò hö hoûng hay maát maùt.

4.20 HEÄ DAØN GIAÙO VAØ THIEÁT BÒ NAÂNG Cung caáp taát caû caùc thieát bò naâng taïm thôøi caàn thieát nhö daøn giaùo, khung hoaëc giaù ñôõ ñeå thi coâng ngoaïi tröø coù chæ thò ñaëc bieät khaùc.

4.21 CHEØN KHE HÔÛ (a) Nieâm kín khí

Toaøn boä loã xuyeân saøn maùng caùp vaø/ hoaëc oáng gioù vaøo chi tieát xaây duïng hoaëc caùc buoàng phoøng caàn phaûi ñöôïc nieâm kín khí.

(b) Choáng thaám caùc loã xuyeân saøn Quaù trình thaám qua saøn cho caùc truïc caùp phaûi ñöôïc laøm baèng vaät choáng thaám trong suoát quaù trình xaây döïng nhaèm giaûm thieåu söï hö haïi do thôøi tieát hoaëc aûnh höôûng cuûa saøn beân trong toaø nhaø.

(c) Loã treân taàng maùi Haøn lieân tuïc quanh maët bích taïo thaønh muõ chaén nöôùc phaûi ñöôïc cung caáp vaø laép ñaët cho taát caû caùc oáng gioù vaø ñöôøng oáng coi nhö laø moät phaàn cuûa coâng vieäc vaø laøm kín vôùi chaát laøm kín ñaõ ñöôïc pheâ duyeät.

(d) Cheøn vaät lieäu caùch aâm Phaûi cung caáp vaø laép ñaët vaät lieäu caùch aâm cho baát cöù nôi naøo coù heä xuyeân töôøng, neàn, traàn nhaø ñeå duy trì ñoä phaân taùn aâm thanh ít nhaát töông ñöông vôùi vaät lieäu ñöôïc cheøn vaøo.

(e) Cheøn vaät lieäu ngaên chaùy




Nôi naøo caùc heä xuyeân qua töôøng choáng chaùy, traàn nhaø, neàn nhaø hoaëc vaät ngaên chaùy khaùc thì phaûi laøm kín cho nhöõng choå xuyeân qua naøy, vaät lieäu laøm kin phaûi coù söï pheâ duyeät cuûa cô quan nhaø nöôùc. ● Cô quan xaây döïng ñòa phöông ● Cô quan PCCC ñòa phöông ● Cô quan ñieän löïc ñòa phöông

Nhöõng phöông phaùp haøn kín choã xaâm nhaäp xung quanh daây caùp vaø khay caùp seõ ñöôïc thöïc hieän baèng caùch söû duïng goái laøm chaäm chaùy ñöôïc gaén chaët vaøo hai beân cuûa taàm xuyeân. Caùc haøng raøo ngaên löûa beân trong söû duïng thieát bò laøm chaäm chaùy phoàng leân ñöôïc söû duïng trong heä thoáng oáng xuyeân qua töôøng hay saøn löûa.

4.22 MAÙY MOÙC THIEÁT BÒ VAØ NUÙT BÍT Khoan loã baèng ñieän hoaëc neáu ñöôïc thì khoan baèng khí neùn. Khoâng duøng caùc thieát bò naïp ñieän gaây noå. Khi caàn cung caáp theâm vaät tö thieát bò cho toøa nhaø, caùc vaät tö/thieát bò ñoù phaûi ñöôïc beân Tö vaán chaáp thuaän. Khoâng ñöôïc duøng caùc nuùt bít laøm baèng goã. Tröôùc khi khoan loã, Nhaø thaàu phaûi laáy yù kieán pheâ duyeät cuûa Beân tö vaán ñeå baûo ñaûm laø khoâng laøm hö vò trí keùo caùp. Nhaø thaàu chính phaûi ñaùnh daáu vò trí cuûa caùp. Bulong neàn loaïi taám catmi ñöôïc duøng ñeå baét vaøo neàn beâ toâng, vaät lieäu baèng gaïch hoaëc ñaát seùt. Bulong, oác vaø ñai oác, voøng ñeäm vaø thieát bò choáng rung ñöôïc duøng ñeå gaén vaøo caùc loaïi vaät lieäu baèng kim loaïi. Nuùt bít duøng gaén vaøo töôøng keå caû töôøng ñöôïc oáp baèng vaät lieäu kim loaïi thì chæ söû duïng loaïi nhoû nhaát. Caùc loã vaø vaät gheùp vaø nuùt bít neo xieát oác nhöïa phaûi theo kích côõ hieäu “Expandet” hoaëc hieäu töông ñöông. Bulong baèng catmi, oác, voøng ñeäm ñöôïc pheùp söû duïng.

4.23 LÖU KHO VAØ BAÛO QUAÛN Thaàu phuï phaûi chòu traùch nhieäm löu kho, baûo quaûn thích hôïp caùc maùy moùc, vaät tö, thieát bò treân khu vöïc laân caän coâng tröôøng, khu vöïc lieân keát vôùi coâng tröôøng. Vaät tö thieát bò ñöôïc giao ra coâng tröôøng, phaûi ñöôïc saép xeáp, &baûo quaûn hôïp lyù ñeå traùnh aåm, buïi vaø phaûi heát söùc löu yù traùnh ñeå ôû nôi ñang thi coâng hoaëc caùc oáng. Thaàu phuï coù traùch nhieäm löu kho taát caû caùc duïng cuï cung caáp cho coâng tröôøng. Thaàu phuï phaûi xin yù kieán Thaàu chính vaø thöïc thi caùc chæ thò cuûa Thaàu chính veà vieäc löu kho vaät tö, ñaëc bieät laø vaät tö coù taûi troïng naëng. Taát caû vaät tö thieát bò phaûi ñöôïc löu kho treân taám saøn hoaëc beä goã saïch seõ. Ñaëc bieät löu yù ñeà phoøng buïi baån, aåm öôùt hoaëc caùc vaät laï loït vaøo oáng daãn daây ñieän. Neáu buïi baån hoaëc vaät laï loït vaøo oáng daãn daây ñieän thì phaûi caån thaän laáy vaät laï ra vaø laøm saïch oáng daãn ñieän. Khi caùc phoøng trong toøa nhaø ñöôïc söû duïng ñeå cheá taïo hoaëc laøm kho chöùa haøng coù lieân quan ñeán coâng vieäc thì phaûi ñöôïc söûa chöõa, doïn saïch tröôùc khi hoaøn taát coâng vieäc taïi ñoù. Khoâng ñöôïc ñeå laãn loän caùc vaät tö treân saøn. Khoâng ñöôïc duøng thieát bò, maùy moùc laøm giaù ñôõ duïng cuï ñoà ngheà hoaëc ngoài treân thieát bò, maùy moùc.




4.24 VEÄ SINH VAØ CHUYEÅN RAÙC KHOÛI COÂNG TRÖÔØNG Nhaø thaàu phuï seõ di chuyeån khoûi coâng trình caùc loaïi raùc, maûnh vuïn, vaät tö bò caét vaø nhöõng vaät tö dö thöøa khaùc töø coâng vieäc cuûa nhaø thaàu phuï naøy vaø baát cöù luùc naøo nhaø thaàu chính yeâu caàu Khi hoaøn taát coâng vieäc, nhanh choùng di chuyeån caùc vaät tö vaø thieát bò töø coâng tröôøng, ngoaïi tröø nhöõng vaät tö vaø thieát bò naøy maø chuû nhaân ñoàng yù löu tröõ laïi ñeå söû duïng trong giai ñoaïn baûo trì hay ñöôïc yeâu caàu ñeå kieåm tra

4.25 TIEÁNG OÀN VAØ ÑOÄ RUNG Caàn löu yù choáng tieáng oàn vaø ñoä rung trong caùc thieát bò vaø nhaø thaàu phuï chòu traùch nhieäm söûa chöõa caùc möùc ñoä oàn vaø rung bò phaøn naøn coù theå xaûy ra ñeå ñaùp öùng yeâu caàu cuûa nhaø tö vaán. Möùc ñoä oàn toái ña trong khu vöïc maùy laïnh khoâng ñöôïc vöôït quaù möùc ñoä xaùc ñònh trong tieâu chuaån AS2107, CIBSE vaø/ hay ôû nhöõng ñieåm khaùc trong quy phaïm kyõ thuaät naøy. Nhaø thaàu phuï seõ saép xeáp ñeå kieåm tra möùc ñoä oàn baèng chi phí cuûa mình ôû nhöõng nôi nhaø tö vaán yeâu caàu ñeå chöùng minh raèng ñaït ñöôïc möùc ñoä yeâu caàu. Möùc ñoä aâm thanh ñieän cuûa maùy, heä soá haáp thuï oáng daãn, thieát bò laøm giaûm daàn vaø caùc loaïi maùy hay vaät tö khaùc seõ ñöôïc ñeä trình ñeå nhaø tö vaán pheâ duyeät tröôùc khi ñaët haøng. Yeâu caàu coù caùc vaät maãu. Caàn löu yù traùnh phaùt sinh vaø truyeàn tieáng oàn vaø ñoä rung quaù möùc nhö sau:

● Cô caáu truyeàn ñoäng quay phaûi ñöôïc caân baèng hôïp lyù vaø ñöôïc thieát keá vôùi khoaûng hôû vaø cô caáu hích hôïp cho caùc yeâu caàu möùc ñoä oàn, ñoái vôùi nhöõng phaàn ñaëc bieät cuûa maùy hay thieát bò, ñöôïc xaùc ñònh ôû nhöõng ñieåm khaùc trong quy phaïm kyõ thuaät naøy

● Cô caáu truyeàn ñoäng quay, tröø khi coù söï xaùc ñònh khaùc, seõ ñöôïc gaén vaøo loø xo, cao su trong boä phaän tröôït hay caùc giaù caùch rung ñöôïc chaáp thuaän khaùc hay laø caùc oå truïc co giaõn. Khung ñöôïc baûo veä khoâng bò hö haïi. Neáu caàn, moät khoái löôïng khaùc ñöôïc gaén vaøo cô caáu. Taûi troïng cuûa khung thích hôïp ñeå ñaûm baûo hoaït ñoäng chính xaùc. Vaät tö söû duïng ñeå haøn kín caùc khoaûn troáng coù vaät tö caùch aâm laø loaïi meàm ñeå ñoä trung khoâng bò truyeàn ñi vaø ñeå moái haøn khoâng bò hö hoûng

● Toác ñoä ñaàu quaït vaø vaän toác vaø ñoäng cô cuõng nhö toác ñoä maùy neùn ñöôïc giöõ trong giôùi haïn ñöôïc xaùc ñònh ôû nhöõng ñieåm khaùc trong quy phaïm kyõ thuaät naøy

● Caùc ñieåm noái ñeán cô caáu quay, ñieåm noái oáng laø ñieåm noái meàm ● Ñieåm noái oáng laøm ñieåm noái meàm thích hôïp vôùi coâng suaát cuûa noù. Cung

caáp caùc ñieåm noái meàm ôû nhöõng nôi ñoä meàm khoâng ñuû trong heä thoáng oáng hay khi ñoä rung coù theå bò truyeàn ñi ñeán cô caáu xaây döïng. Caùc vaät noái meàm ñöôïc ñaët sao cho khoâng coù öùng suaát naøo trong oáng do phaûn öùng cuoái. Caùc ñieåm noái meàm trong ñöôøng gas chæ ñöôïc pheùp khi heä thoáng oáng khoâng ñöôïc saép xeáp ñeå coù ñoä meàm thích hôïp

● Ñoäng cô ñieän laø loaïi yeân tónh ôû nhöõng nôi maø tieáng oàn cuûa noù coù theå laøm caûn trôû nhöõng khu vöïc söû duïng hay taêng möùc ñoä oàn treân möùc xaùc ñònh. Vaät noái khoâng coù tieáng oàn vaø ñoä rung quaù möùc




● Caùc oáng daãn caùch ly beân trong seõ ñöôïc cungc aáp ôû nhöõng nôi ñöôïc xaùc ñònh. Beân trong oáng sao cho vieäc chuyeån ñoäng caøng eâm caøng toát – khoâng ñöôïc söû duïng caùc ñaàu cuoái ñinh vít, caïnh kim loaïi thoâ, taám keâu vang trong doøng khí

● Caùc ñaàu khí ra vaø vaøo ñöôïc choïn löïa cho pheùp ñaït ñöôïc möùc ñoä oàn chæ ñònh

4.26 HEÄ THOÁNG OÁNG LOÙT (PIPE SLEEVE) Cung caáp heä thoáng oáng loùt ôû nhöõng nôi caàn thieát laép ñaët oáng xuyeân qua caáu truùc toøa nhaø nhö töôøng, saøn v.v.




4.27 GIAÕN NÔÛ

Caùc phaàn qua ñoä giaõn nôû vaø baét buoäc ôû nhöõng nôi caàn thieát ñeå ñaûm baûo öùng suaát do giaõn nôû ñöôïc khai thoâng vaø khoâng bò truyeàn ñeán caùc thieát bò coá ñònh hay caáu truùc toøa nhaø. Ñieàu naøy goàm vieäc cung caáp vaø laép ñaëc caùc thieát bò giaõn nôû caàn thieát




5. THIEÁT BÒ

5.1 CHILLER LY TAÂM HOAËC TRUÏC VÍT – GIAÛI NHIEÄT BAÈNG NÖÔÙC (a) Khaùi quaùt

Duøng moät chuyeân gia ñeå thöû nghieäm vaø nghieäm thu thieát bò thöïc hieän caùc haïng muïc töø khi ñöa thieát bò vaøo söû duïng ñeán khi hoaøn taát giai ñoaïn baûo trì. Thuû tuïc baûo trì do nhaø saûn xuaát ñeà xuaát, bao goàm cung caáp caùc höôùng daãn söû duïng. Thieát bò chiller laø loaïi ñoä oàn thaáp, bình ngöng giaûi nhieät baèng nöôùc, maùy neùn ly taâm hoaëc truïc vít coù hieäu suaát cao nhaát. Moãi boä thieát bò chiller laø boä hoaøn toaøn töï ñoäng, ñöôïc laép raùp, ñoùng goùi taïi nhaø maùy cuûa haõng chuyeân cung caáp loaïi thieát bò chiller. Thieát bò ñöôïc saûn xuaát töø daây chuyeàn saûn xuaát hieän haønh, ñöôïc kieåm tra veà coâng suaát vaø ñieàu kieän vaän haønh theo qui ñònh. Thieát bò bao goàm maùy neùn ly taâm hoaëc truïc vít, moâtô, bình boác hôi, bình ngöng vaø tuû ñieàu khieån. Taát caû caùc thieát bò naøy ñöôïc gaén treân khung keát caáu vaø ñöôïc trang bò caùc phuï kieän caàn thieát ñeå coù theå vaän haønh töï ñoäng. Caùc phuï kieän bao goàm nhöng khoâng giôùi haïn ôû caùc haïng muïc nhö oáng daãn, heä thoáng kieåm soaùt, daây ñieän, nhieät keá, ñoàng hoà ño, v.v. Xeáp ñaët caùc loã môû vaø caùc ñaàu noái beân ngoaøi phuø hôïp vôùi vieäc laép ñaët thieát bò theo qui ñònh. Thieát bò phaûi phuø hôïp laép ñaët trong nhaø söû duïng taïi vuøng bieån trong moïi ñieàu kieän thôøi tieát vaø moâi tröôøng.

(b) Tieâu chuaån Phieân baûn hieän haønh cuûa nhöõng tieâu chuaån sau ñaây seõ ñöôïc tham chieáu ñeán trong phaàn naøy: ● AS 1023 Low Voltage Switchgear and Control Gear – Protection of

Electric Motors ● AS 1044 Radio Interference ● AS 1210 SAA Unfired pressure vessels code ● AS 1359 General requirements For Rotating Electrical Machinery ● AS 1677 Refrigerating systems ● AS 2129 Flanges for pipes, valves and fittings ● AS 2279 Disturbances In Mains Supply Networks ● AS 2625 Rotating and Reciprocating Machinery – Mechanical

Vibration ● AS 2372 Control Cables For Electrical Supply Systems ● AS 3000 SAA Wiring rules ● AS 3008 Electrical Installations – Selection of Cable

(c) Thöû nghieäm Taát caû caùc boä thieát bò chiller giaûi nhieät baèng nöôùc phaûi ñaùp öùng nhöõng yeâu caàu sau: (i) Tieâu thuï ñieän:

Löôïng ñieän tieâu thuï cuï theå ño ñöôïc khoâng ñöôïc pheùp lôùn hôn 105% löôïng ñieän tieâu thuï toái ña theo qui ñònh.

(ii) Coâng suaát:




Coâng suaát ño ñöôïc khi ñaõ ñieàu chænh, söû duïng heä soá boác hôi nhö lieät keâ döôùi ñaây khoâng ñöôïc pheùp nhoû hôn 100% coâng suaát qui ñònh.

(iii) Tieâu chuaån thöû nghieäm ñöôïc chaáp thuaän: Moãi chiller cung caáp phaûi ñöôïc chöùng nhaän ñaõ ñöôïc thöû nghieäm nhöõng tính toaùn vaø ño löôøng taïi nhaø maùy, ñaùp öùng yeâu caàu vaän haønh vôùi coâng suaát taûi toái ña trong ñieàu kieän baån. Heä soá thöû nghieäm cho oáng ñoàng nhö sau:

Saïch Baån Daøn bay hôi 0.0m² k/kW 0.044m²k/kW

(iv) Thoâng tin boå sung: Nhöõng thoâng tin sau ñöôïc ghi nhaän trong quaù trình thöû nghieäm taïi nhaø maùy: döõ lieäu phaûi ñuû ñeå nhaän daïng goùi thieát bò chiller bao goàm nhaõn hieäu, kieåu maãu, soá xeâri, gas.

(v) Thoâng tin baûng teân moâtô: Teân maùy ño, ñoàng hoà, thieát bò ño quaù taûi vaø thieát bò an toaøn, boä ñieàu khieån, v.v.

(vi) Thöû nghieäm aùp löïc: Theo tieâu chuaån AS 1677, Khoaûn 4.6. Coâng taùc kieåm tra heä thoáng gas toái thieåu ñaït 1.5 aùp löïc vaän haønh.

(vii) Söï roø ræ gas: Kieåm tra söï roø ræ baèng ñeøn halide.

(d) Yeâu caàu Moãi maïch gas phaûi hoaøn toaøn ñoäc laäp vôùi nhöõng maïch khaùc sao cho baát kyø söï coá naøo cuûa maïch gas cuõng khoâng aûnh höôûng ñeán nhöõng maïch khaùc. Moãi maïch ga bao goàm: ● Maùy saáy ga cuøng vôùi maïch reõ ● Thieát bò ño ñoä aåm vaø kính ngaém ñöôïc laép ñaët ôû vò trí deã thaáy vaø deã tieáp

caän ● Van co giaõn nhieät tónh (Thermostatic expansion valves) seõ ñöôïc vaän

haønh thöû, van co giaõn nhieät caân baèng beân ngoaøi ñöôïc cung caáp van ñieän töø (solenoid valves) cho moãi giai ñoaïn

● Boä loïc Y huùt maùy neùn ● Giaûm aâm ñaàu xaû maùy neùn ● Van baûo trì maùy neùn ● Ñoàng hoà aùp löïc ôû ñaàu huùt vaø ñaàu xaû vaø ñoàng hoà aùp löïc daàu ñöôïc gaén ôû

vò trí deã thaáy vaø deã tieáp caän ● Van xaû aùp beân trong cho maùy neùn ● Kính ngaém möùc daàu ● Boä haâm daàu maùy neùn ● Naép ñaäy thuøng daàu




Moãi maïch gas ñöôïc noái vôùi daøn bay hôi loaïi voû soø chöùa ñaàu noái oáng xaû nöôùc vaø oáng thoâng hôi vôùi van coù ñöôøng kính toái thieåu laø 20mm. Ñaàu noái oáng daãn ñöôïc gaén vaøo pheãu (tundish). Voû daøn bay hôi ñöôïc caùch nhieät, boïc kim loaïi, ñöôïc thieát keá vaø cheá taïo nhö bình aùp löïc theo tieâu chuaån AS 1677 Khoaûn 3.1 vaø AS 1210 ñoái vôùi aùp löïc vaän haønh phía coù nöôùc khoâng nhoû hôn 1000 kPa vaø ñoái vôùi aùp löïc vaän haønh phía coù gas nhö qui ñònh trong tieâu chuaån AS 1677 cho thieát bò söû duïng gas. Giaáy chöùng nhaän thöû nghieäm thuûy löïc phaûi do cô quan chöùc naêng caáp. Gas phaûi laø loaïi HCFC 134a hoaëc laø loaïi ñöôïc chaáp thuaän. Toaøn boä ñaàu noái oáng nöôùc phaûi coù maët bích theo Tieâu chuaån AS 2129. Daøn coil baèng oáng ñoàng coù caùnh taûn nhieät baèng nhoâm, ñöôïc ñaët trong voû baèng theùp laù maï keõm. Laù nhoâm taûn nhieät phaûi ñöôïc baûo veä baèng lôùp nhöïa epoxy choáng aên moøn vaø choáng aûnh höôûng thôøi tieát. Moãi maùy ngöng seõ ñöôïc cung caáp thieát bò kieåm soaùt aùp löïc coù ñaàu ñieàu chænh rieâng. Moãi maïch gas ñöôïc cung caáp bình chöùa chaát loûng rieâng ñöôïc thieát keá vaø cheá taïo nhö bình aùp löïc theo tieâu chuaån AS 1677 Khoản 3.1 vaø AS 1210 ñoái vôùi aùp löïc vaän haønh nhö qui ñònh trong tieâu chuaån AS 1677 cho thieát bò söû duïng gas. Giaáy chöùng nhaän thöû nghieäm thuûy löïc phaûi do cô quan chöùc naêng caáp. Bình chöùa chaát loûng ñöôïc gaén van xaû aùp ra ngoaøi khí quyeån theo tieâu chuaån AS 1677. Bình chöùa chaát loûng phaûi coù kích thöôùc sao cho coù theå chöùa ñöôïc toaøn boä gas cuûa heä thoáng.

(e) Thieát bò ñieàu khieån vaø khoaù lieân ñoäng Theo tieâu chuaån AS 3000. Cung caáp 1 tuû ñieàu khieån cho moãi chiller. Trong phaïm vi tuû ñieàu khieån thieát bò chiller naøy, gaén khoaù lieân ñoäng, thieát bò baám giôø, rơle, thieát bò khôûi ñoäng moâtô, caàu chì (breakdown fuses), thieát bò kieåm soaùt coâng suaát, kieåm soaùt an toaøn vaø ñaáu noái vaøo khoaù lieân ñoäng vôùi maùy bôm beân ngoaøi, coâng taéc doøng, v.v. ñeå baûo ñaûm vaän haønh an toaøn vaø thoûa ñaùng, vaø nhaèm khôûi ñoäng laïi thieát bò chiller ngay khi khoâi phuïc nguoàn ñieän bò ngaét. Saép xeáp thieát bò an toaøn sao cho thieát bò chæ ñoùng maïch coù lieân quan vaø ñoøi hoûi phaûi ñöôïc ñieàu chænh laïi baèng tay tröôùc khi khôûi ñoäng laïi. Moãi thieát bò chiller phaûi ñöôïc cung caáp vaø laép ñaët heä thoáng kieåm soaùt vaø giaùm saùt boä vi xöû lyù rieâng theo yeâu caàu cuûa nhaø saûn xuaát chiller vaø ñöôïc gaén vaøo tuû ñieàu khieån chiller. Heä thoáng naøy phaûi ñöôïc thieát keá sao cho khoâng bò aûnh höôûng bôûi khôûi ñoäng cuûa maùy neùn, doøng ñieän vaø söï rung ñoäng. Khi thieát bò chiller ñöôïc laép ñaët ngoaøi trôøi, phaûi baûo ñaûm taát caû caùc boä phaän phaûi ñöôïc baûo veä töông thích vaø toaøn boä thieát bò ñieän coù lôùp voû ngaên taùc ñoäng cuûa thôøi tieát. Chiller phaûi bao goàm theû giao tieáp vôùi heä thoáng BMS. Moãi heä thoáng giaùm saùt seõ thöïc hieän nhöõng chöùc naêng giaùm saùt vaø ñieàu khieån toái thieåu nhö sau: (i) Moät maøn hình tinh theå loûng toái thieåu 80 kyù töï chöõ vaø soá giaûi thích roõ

nhöõng thoâng soá cuûa heä thoáng baèng tieáng Anh




(ii) Laäp trình baèng kyõ thuaät soá cuûa nhöõng ñieåm caøi ñaët caàn thieát thoâng qua giao dieän thaân thieän vôùi ngöôøi söû duïng

(iii) Lieân tuïc kieåm soaùt nhieät ñoä nöôùc laïnh vaøo vaø ra (iv) Lieân tuïc ñieàu khieån thieát bò kieåm soaùt vaø ngaét an toaøn sau ñaây cho moãi

maïch ga: ● Nhieät ñoä cuoän daây moâtô cao ● Aùp löïc gas cao/ thaáp ● Aùp löïc daàu thaáp ● Nhieät ñoä nöôùc laïnh ra thaáp ● Löu löôïng nöôùc laïnh thaáp ● Rôle phuï coâng taéc tô maùy bôm nöôùc laïnh ● Vaän haønh hoäp haâm daàu ● Döï phoøng ñaáu noái nhaèm baùo ñoäng töø xa

(v) Töï ñoäng khôûi ñoäng, mang taûi, khoâng taûi vaø ngöøng maùy neùn vôùi boä treã thôøi gian ñöôïc cheá taïo theo ñeà xuaát cuûa nhaø saûn xuaát chiller nhaèm duy trì nhieät ñoä ñieåm caøi ñaët nöôùc laïnh laø ± 0.50C vôùi ñieàu kieän taát caû caùc khoaù lieân ñoäng an toaøn phaûi ôû ñuùng vò trí khi nhaän ñöôïc tín hieäu khôûi ñoäng töø xa

(vi) Ñieàu chænh baèng tay nhöõng thieát bò sau: ● Ñieåm caøi ñaët kieåm soaùt nöôùc laïnh ra ● Boä chuyeån ñoåi tröôùc, sau cuûa maùy neùn

(vii) Hieån thò treân ñoàng hoà toång soá giôø moãi maùy neùn vaän haønh, toång soá laàn khôûi ñoäng vaø ñieän naêng tieâu thu

(viii) Nuùt ñieàu chænh laïi ñieàu khieån baèng tay ñeå ñieàu chænh laïi toaøn boä thieát bò kieåm soaùt an toaøn coù lieân quan cho moãi maïch gas

(ix) Töï ñoäng thay ñoåi thöù töï vaän haønh tröôùc/ sau cuûa moãi maùy neùn döïa treân qui luaät laø nhaèm duy trì soá giôø vaän haønh töông ñöông giöõa caùc maùy

Laép ñaët rôle töï do thay ñoåi ñieän aùp cho moãi maïch gas trong moãi tuû ñieàu khieån chiller vaø ñaáu noái thieát bò kieåm soaùt söï coá khôûi ñoäng maùy neùn vaøo rôle naøy

(f) Boä haâm daàu Noái moãi boä haâm daàu maùy neùn vaøo caùc ñaàu noái cung caáp ñieän rieâng bieät keát hôïp vôùi phaàn ñieàu khieån moâtô. Vieäc cung caáp ñieän ñoäc laäp vôùi maïch phuï khôûi ñoäng chiller vaø ñöôïc caùch ly baèng coâng taéc rieâng treân tuû ñieàu khieån maùy neùn. Cung caáp hieån thò treân tuû ñieàu khieån chiller ñeå bieát coù nguoàn ñieän cung caáp cho boä haâm daàu.

(g) Boä khôûi ñoäng ñoäng cô Theo tieâu chuaån AS 3000. Ñoäng cô maùy neùn laø loaïi ly taâm hoaëc truïc vít, giaûi nhieät baèng gas laïnh loûng, khoâng roø ræ, toác ñoä toái ña laø 1500 voøng/ phuùt vaø coâng suaát vaän haønh toái ña ñöôïc choïn laø baèng 105% coâng suaát cuûa maùy neùn.




Moãi ñoäng cô maùy neùn phaûi phuø hôïp vôùi boä khôûi ñoäng gaén beân trong tuû ñieàu khieån cuûa moãi chiller. Boä khôûi ñoäng ñoäng cô phaûi ñöôïc choïn loïc vaø phaûi phuø hôïp vôùi ñoäng cô maùy neùn. Choïn soá laàn khôûi ñoäng toái ña laø 4 laàn moãi giôø vaø laép ñaët ñoàng hoà ñònh giôø ñeå soá laàn khôûi ñoäng khoâng vöôït quaù soá qui ñònh. Boä khôûi ñoäng ñoäng cô maùy neùn phaûi bao goàm nhöõng chöùc naêng sau: ● Ñeå duøng cho vaän haønh lieân tuïc ● Ñeå duøng cho khôûi ñoäng ngaét quaõng toái thieåu laø 4 laàn/ giôø. Ñaët ñoàng hoà

ñeå baûo ñaûm khoâng vöôït quaù soá laàn qui ñònh ● Baûo veä söï coá maát pha, caân baèng pha (Phase loss/in balance failure

protection), baûo veä ñieän aùp quaù taûi/ döôùi taûi ● Boä baûo veä quùa doøng baèng nhieät phuø hôïp vôùi coâng suaát moâtô trong moãi

doøng hoaït ñoäng ñeán moâtô ● Ñieàu chænh baèng tay thieát bò baûo veä caùc boä phaän khôûi ñoäng ñieän aùp

giaûm khoûi bò quaù nhieät ● Taùch rieâng ñeøn bieåu thò söï coá cuûa moãi thieát bò baûo veä ● Taát caû nhöõng thieát bò baûo veä vaø thieát bò ñieàu khieån khaùc do nhaø saûn

xuaát chiller ñeà xuaát (h) Choïn löïa

Söï thaát thoaùt aùp löïc nöôùc laïnh qua daøn boác hôi khoâng ñöôïc vöôït quaù 60kPa theo coâng suaát toái ña qui ñònh trong ñieàu kieän saïch (clean). Toác ñoä nöôùc khoâng ñöôïc vöôït quaù 2.0m/s theo coâng suaát toái ña qui ñònh

(i) Gas Moãi daøn coil cuûa chiller phaûi ñöôïc naïp ñaày daàu vaø gas. Nhaø thaàu coù theå ñöôïc yeâu caàu cung caáp theâm gas trong giai ñoaïn baûo trì do söï coá cuûa heä thoáng trong vieäc duy trì naïp gas hoaëc nhöõng söï coá khaùc cuûa heä thoáng . Gas phaûi laø loaïi HCFC R134a/R123

(j) Laép ñaët vaø baûo trì Laép moùc naâng vaøo chiller. Laép chiller treân caùc boä giaûm chaán baèng cao su nhaân taïo, loø xo hoaëc tuùi khí bôm phoàng nhaèm baûo ñaûm caùch ly rung ñoäng ñeán 98%. Chuyeân gia tö vaán veà vieäc laép ñaët vaø tieán haønh nghieäm thu thieát bò chiller. Sau khi nghieäm thu, chuyeân gia seõ coù maët trong hai ngaøy ñaàu vaän haønh thieát bò ñeå höôùng daãn ngöôøi vaän haønh maùy vaø ñieàu chænh caùc thoâng soá vaän haønh, neáu caàn. Chuyeân gia seõ thöû nghieäm thieát bò ngaét an toaøn sau khi laép ñaët vaø baûo döôõng thieát bò theo ñeà xuaát cuûa nhaø saûn xuaát trong thôøi gian baûo haønh, bao goàm caû vieäc laáy maãu daàu vaø thöû nghieäm. Chuyeân gia cuõng seõ thay ñoåi daàu vaø thay theá thieát bò loïc khi keát thuùc giai ñoaïn baûo haønh.

(k) Thöû nghieäm vaø nghieäm thu Vieäc thöû nghieäm hoaït ñoäng cuûa maùy moùc thieát bò laø baét buoäc. Khi thöû nghieäm, seõ coù haïn möùc cho pheùp veà sai soá theo tieâu chuaån ARI 550/66. Tuy nhieân, phaûi ñaït yeâu caàu toái thieåu veà coâng suaát qui ñònh. Chuû ñaàu tö coù quyeàn kieåm tra thieát bò chiller khi saûn xuaát, cuõng nhö chöùng kieán thöû nghieäm aùp löïc, chaân khoâng hoaëc vaän haønh thöû vaø phaûi baùo tröôùc boán tuaàn tröôùc khi thöû nghieäm.




Baûng kieåm tra tieàn nghieäm thu phaûi ñöôïc hoaøn taát tröôùc khi nghieäm thu. Baûn sao giaáy chöùng nhaän thuû tuïc laép ñaët (set-up), nghieäm thu vaø soå nhaät kyù baûo trì phaûi ñöôïc cung caáp. Thieát bò chiller phaûi ñöôïc nghieäm thu ñaùp öùng yeâu caàu thieát bò chaïy oån ñònh, khoâng bò söï coá trong suoát quaù trình vaän haønh. Toaøn boä thieát bò kieåm tra phaûi ñöôïc ño löôøng ñoä chính xaùc. Nhöõng ñieàu chænh phaûi ñöôïc nieâm phong.

(l) Baûo trì nhaèm muïc ñích phoøng ngöøa Haøng quùy, nhaø saûn xuaát thieát bò chiller thöïc hieän coâng taùc baûo trì nhaèm muïc ñích phoøng ngöøa cho thieát bò chiller trong thôøi gian baûo haønh laø 52 tuaàn. Nhaø saûn xuaát phaûi ñeä trình tieán ñoä baûo trì, thöû nghieäm chuaån vaø bieåu maãu baùo caùo baûo trì haøng quùy khi ñeä trình hoà sô ñaáu thaàu. Nhaø cung caáp phaûi cung caáp mieãn phí toaøn boä caùc haïng muïc caàn thieát cho coâng taùc baûo trì bao goàm gas, daàu, thieát bò loïc, ñeäm, v.v. Sau moãi ñôït baûo trì cuûa moãi quùy, nhaø cung caáp phaûi ñeä trình nhöõng baùo caùo sau: ● Baùo caùo baèng vaên baûn neâu roõ coâng vieäc ñaõ thöïc hieän vaø tình traïng thieát

bò ● Danh muïc kieåm tra vaø baûo trì ñaày ñuû thoâng tin




5.2 THAÙP LAØM MAÙT

(a) Khaùi quaùt

Tuaân theo tieâu chuaån AS 3666 vaø caùc höôùng daãn kyõ thuaät cuûa caùc cô quan coù thaåm quyeàn ôû ñòa phöông. chöùng minh söï löïa choïn tính naêng vaän haønh phuø hôïp baèng caùch xem xeùt caùc keát quaû kieåm tra vaø caùc tính toaùn cho pheùp ñeå ñaûm baûo phuø hôïp vôùi ñieàu kieän thöïc teá. Kieåm tra laïi tính naêng vaän haønh baèng vieäc thöïc hieän kieåm tra taïi hieän tröôøng tuaân thuû theo tieâu chuaån kieåm tra ATC-105 cuûa vieän nghieân cöùu thaùp toaû nhieät “Cooling Tower institute” ñöôïc thöïc hieän trong thôøi gian baûo haønh. Neáu keát quûa kieåm tra cuû thaùp toû nhieät khoâng ñaùp öùng theo tieâu chuaån vaø yeâu caàu kyù thuaät, toaøn boä chi phí cho vieäc khaéc phuïc vaø thí nghieäm laïi ñeàu do nhaø thaàu gaùnh chòu. Coù ñoä toån thaát khoâng lôùn hôn 2%.

(b) Loaïi

Ñöôïc laép ñaët taïi nhaø maùy vôùi kieåu daùng hình chöõ nhaät, cuûa nhaø saûn xuaát ñöôïc chaáp nhaän, coù keát caáu baèng sôïi thuyû tinh hoaëc nhöïa PVC, ñöôïc laép ñaët hoaøn chænh vôùi quaït, heä thoáng phaân phoái nöôùc, caùc taám taûn nhieät, khay chöùa nöôùc, caùc pheãu xaû caën, thieát bò loïc nöôùc choáng taïo soùng, van vaø caùc phuï kieän. Löïa choïn coâng suaát cuûa thaùp laøm maùt phuø hôïp vôùi vò trí laép ñaët ñöôïc chæ ra trong caùc baûn veõ, vôùi ñaày ñuû cöï ly tónh khoâng cho laép ñaët, vaän haønh vaø baûo döôõng. Khi laép ñaët ngoaøi coâng trình, thì phaûi chuïi ñöôïc taùc ñoäng cuûa gioù leân beà maët töông ñöông vôùi 1.5kPa.

(c) Keát caáu

Caùc keát caáu baèng polyester coát sôïi thuyû tinh hoaëc PVC ñöôïc saûn xuaát töø caùc vaät lieäu choáng aên moøn, beàn vöõng vôùi tia böùc xaï maët trôøi UV, taát caû caùc khoaù, choát, ñinh vít baèng inox. Treân voû coù caùc cöûa thieát bò yeâu caàu ñeå tieáp caän tôùi taát caû caùc phaàn beân trong, bao goàm heä thoáng phaân phoái nöôùc, maø khoâng phaûi thaùo toaøn boä voû. Chaân giaù ñôõ, khung, vaø caùc boä phaän keát caát khaùc ñöôïc saûn xuaát baèng theùp, ñöôïc traùng keõm nhuùng noùng sau khi laép raùp hoaøn chænh. Duøng inox cho caùc boä phaän kim loaïi, bao goàm buloâng, oác vít, coâng soân vaø caùc boä phaän khaùc ôû nhöõng nôi aåm öôùt hoaëc coù hôi nöôùc.

(d) Khay chöùa nöôùc vaø phaân phoái

Ñaùy khay doác veà phía hoá xaû, ñöôïc laép ñaët löôùi chaén coù theå laép môû ôû ñaàu nöôùc ñi ra, nöôùc traøn, van xaû caën, vaø van phao ñeå khoáng cheá möùc nöôùc. Heä thoáng cung caáp nöôùc ñöôïc thieát keá vôùi 140% coâng suaát yeâu caàu maø khoâng laøm cho nöôùc bò traøn hoaëc baén ra ngoaøi. Caùch khung aáy coù ñaàu phun laøm baèng polyacital, ñoàng thau, nhoâm, hôïp kim hoaëc vaät lieäu choáng aên moøn khaùc. Loai ñaàu phun: chi phí thaáp vaø coù theå thay theá ñöôïc.




Ñöôøng oáng phaân phoái nöôùc: Polypropylene hoaëc caùc kim loaïi maøu. Coù caùc taám taûn nhieät nhanh vaø van phao khoângs cheá möùc nöôùc Van xaû nöôùc baèng tay coù D40 cho thaùp loaïi nhoû vaø D50 cho thaùp loaïi lôùn.

(e) Caùc taám taûn nhieät cuûa thaùp laøm maùt

Coù caáu taïo daïng löôïn soùng toå ong, coù theå thaùo laép ñöôïc, hoaëc cheá taïo ñeå coù theå laøm veä sinh ñöôïc.

(f) Quaït

Truyeàn ñoäng tröïc tieáp toác ñoä chaám hoaëc qua ñai truyeàn, coù ñoä oàn nhoû khi vaän haønh vaø caân baèng tónh vaø ñoäng. Caùnh quaït: baèng nhoâm hoaëc thuyû tinh coát ni loâng, truïc baèng inox. Quaït li taâm: thaân quaït coát sôïi thuyû tinh, caùnh quaït sôn epoxy hoaëc maï keõm, truïc baèng inox, caùc moâ tô coù puly theùp ñuùc coù choát Caùc ñoäng cô vaø truyeàn ñoäng tuaân theo caùc ñieàu veà choát ñoäng cô vaø ñai truyeàn, puli vaø truyeàn ñoäng trong phaàn naøy cuûa thuyeát minh kyõ thuaät. Caùc ñoäng cô coù 2 toác ñoä khi lôùn hôn 11kw coù nhieàu toác ñoä.

(g) Thang ñi laïi

Baèng theùp maï keõm hoaëc baèng inox ñeå tieáp caän heä thoáng phaân phoái nöôùc vaø quaït. Thang leân thaùp vaø caùc phöông tieän ñi laïi noùi chung phaûi phuø hôïp vôùi tieâu chuaån an toaøn cuûa ñòa phöông vaø tieâu chuaån AS 1657 Lan can leân thaùp laøm maùt caàn phaûi ñöôïc cung caáp phuø hôïp vôùi tieâu chuaån AS 1657




5.3 BÔM LY TAÂM (CENTRIFUGAL PUMPS) Bôm phaûi laø loaïi huùt ñaàu cuoái, khung rôøi, truïc ngang, thieát keá keùo veà phía sau, coù noái meàm (spacer couplings) cho pheùp thaùo laép caùnh coâng taùc vaø oå truïc maø khoâng caàn phaûi thaùo rôøi oáng. Chaân bôm ñöôïc ñaët treân maët ñaùy ñaàu xaû voû xoaén oác Bôm phaûi vöøa vôùi hoäp bít voøng ñeäm kín Bôm phaûi coù maùng höùng vaø oáng daãn nöôùc baèng ñoàng ñöa ñeán saøn thu nöôùc thaûi gaàn nhaát. Maùng höùng bôm phaûi laøm baèng ñoàng vaø keùo daøi ra ngoaøi meùp bôm khoâng caùch nhieät ñeå thu nöôùc nhoû gioït. OÅ truïc phaûi laø loaïi con laên hoaëc bi ñöôïc treùt môõ töï ñieàu chænh, coù coâng suaát lôùn hôn nhu caàu, ñöôïc thieát keá vaän haønh trong suoát chu kyø söû duïng cuûa thieát bò hoaëc khoâng döôùi 100,000 giôø vaän haønh lieân tuïc. OÅ truïc phaûi ñöôïc gaén vaøo hoäp giaûm môõ. Toaøn boä oå truïc phaûi vöøa vôùi nuùt môõ cuøng chuûng loaïi vaø kích thöôùc. Tröø phi ñöôïc qui ñònh khaùc ñi, moãi bôm phaûi ñaáu noái tröïc tieáp vaøo moâtô daïng loàng soùc baïc ñaïn bi, toác ñoä 24v/ s khoâng quùa taûi. Voû moâtô phaûi laø loaïi ngaên nöôùc nhoû gioït. Truïc moâtô phaûi laø loaïi beà maët hoaøn thieän ñoå nhöïa nhieàu lôùp. Bôm vaø moâtô phaûi ñöôïc laép treân moät khung ñôõ ñöôïc laøm töø theùp U caùn vôùi beà maët ñöôïc gia coâng phuø hôïp ñoái vôùi maùy bôm vaø chaân moâtô. Khung ñôõ phaûi hoaëc maï keõm. Maùy bôm phaûi ñöôïc sôn phuû hoaøn thieän tröôùc khi giao ñeán coâng tröôøng. Coâng taùc laép raùp phaûi ñöôïc hoã trôï baèng beä beâ toâng quaùn tính vaø thieát bò caùch ly rung ñoäng. (Xem phaàn “Ñoä oàn vaø rung ñoäng”). Noái oáng loã xaû nöôùc (Gland well drains) vaøo saøn thu nöôùc thaûi gaàn nhaát.




5.4 PAU (PRIMARYAIR HANDLING UNITS) (a) Toång quaùt

PAU coù coâng suaát nhö ñöôïc lieät keâ trong Phuï luïc B - Baûøng döõ lieäu kyõ thuaät vaø nhö ñöôïc xaùc nhaän bôûi ARI/ASHRAE. Thieát bò phaûi laø loaïi ñaët ngoaøi trôøi, beà maët keùp, thoåi theo phöông doïc hoaëc ngang nhö qui ñònh trong Baûng döõ lieäu kyõ thuaät. Thieát bò phaûi ñöôïc thieát keá sao cho coù theå deã daøng tieáp can vaø baûo trì. Thieát bò phaûi ñöôïc choáng rung nhö qui ñònh trong phaàn “Kieåm soaùt ñoä oàn vaø ñoä rung” cuûa Quy phaïm Kyõ thuaät naøy. Toaøn boä thieát bò phaûi ñöôïc sôn taïi xöôûng theo ñeà xuaát cuûa nhaø saûn xuaát vaø nhö qui ñònh trong phaàn “Sôn, maõ maøu vaø daùn nhaõn” cuûa Quy phaïm Kyõ thuaät naøy. Vaät lieäu choáng aên moøn vaø phöông phaùp laép ñaët phuø hôïp phaûi ñöôïc söû duïng nhaèm ngaên chaën söï aên moøn bao goàm caùch ly nhöõng vaät lieäu khoâng töông thích nhaèm ngaên ngöøa söï chaäp ñieän. Moãi caáu kieän cuûa PAU phaûi coù kích thöôùc maët caét phuø hôïp ñeå baûo ñaûm kích thöôùc beân trong baèng nhau cho luoàng gioù thoåi lieân tuïc vaø ñeå taïo ra beà maët beân ngoaøi ñoàng nhaát. Khoâng cho pheùp coù choã loài. Toaøn boä caáu kieän xoay phaûi ñöôïc gaén vaøo khung gaàm hoaøn toaøn caùch ly treân khung choáng rung baèng loø xo/ oáng neoprene cuûa khung hoaëc voû. Caùc ñoaïn thieát bò phaûi ñöôïc cheá taïo nhaèm ngaên chaën söï goõ ñaäp hoaëc bieán daïng taám vôùi aùp suaát cheânh leäch 2.5 kPa. Thieát bò chöùa trong caùc ñoaïn phaûi ñöôïc ño kích thöôùc vaø ñöôïc choïn loïc nhaèm duy trì giôùi haïn toác ñoä beà maët qui ñònh neâu trong baûng danh muïc thieát bò cuûa Quy phaïm Kyõ thuaät naøy. Caùc ñoaïn thieát bò phaûi ñöôïc keát caáu nhieàu phaàn noái laïi ñeå deã daøng thay theá hoaëc ñöa theâm vaøo nhöõng ñoaïn boå sung. Caùc ñoaïn phaûi ñöôïc ño kích thöôùc cho phuø hôïp vôùi ñieàu kieän baûo trì giôùi haïn taïi coâng tröôøng.

(b) Voû thieát bò Voû thieát bò ñöôïc laøm töø khung thieát keá kín vaø phuû baèng taám voû hai lôùp, ñöôïc thieát keá vaø keát caáu sao cho coù theå ngaên chaën söï goõ ñaäp hoaëc bieán daïng vôùi aùp löïc leân ñeán 2.5 kPa. Khung phaûi ñöôïc laøm töø ñoaïn theùp maï keõm nhuùng noùng hoaëc nhoâm ñuùc, hôïp kim silicon magne nhaèm cung caáp cöôøng ñoä toái ña döôùi ñieàu kieän vaän haønh ñöôïc thieát keá. Khung phaûi ñöôïc khoaù ñaëc bieät sao cho khoâng xaûy ra söï tieáp xuùc tröïc tieáp kim loaïi, taïo neân söï ngöng tuï treân khuoân. Khoâng ñöôïc haøn khi ñaáu noái khung bao goàm ñaáu noái khung chính vaøo khung phuï, khung chính vaøo khung chính hoaëc khung phuï vaøo khung phuï. Khung chính vaø khung phuï ñöôïc ñaët taïi vò trí sao cho khoâng caàn phaûi thaùo dôõ khung khi thay theá quaït vaø daøn laïnh. Khi laép ñaët thieát bò, cung caáp ñeá laøm baèng theùp U maï keõm chòu löïc cao.




Caùc baûng laø loaïi hai lôùp, daøy 50mm, bao goàm hai taám maï keõm daøy 1.0mm, taám caùch nhieät polyurethane foam khoâng chöùa CFC, haøn chaët vaøo lôùp beân trong vaø beân ngoaøi, khoâng coù keõ hôû khoâng khí giöõa hai lôùp. Caùc baûng caùch nhieät khoâng ñöôïc duøng cho caùc thaønh phaàn thieát bò. Thieát bò seõ khoâng bò aûnh höôûng khi thaùo rôøi taám caùch nhieät. Vaät lieäu caùch nhieät phaûi laø loaïi ñöôïc cheøn vaøo, khoâng gaây meùo moù hoaëc hình thaønh loã hoång. Vaät lieäu caùch nhieät phaûi coù suaát daãn nhieät khoâng lôùn hôn 0.02W/m2 K ôû nhieät ñoä 10oC vaø tuaân theo yeâu caàu FSD. Caùch nhieät cho toaøn boä khung, gaân taêng cöùng, loã troáng cuûa khuoân kim loaïi vaø nhöõng beà maët loä ra ngoaøi nhaèm ngaên chaën söï ngöng tuï xaûy ra treân beà maët thieát bò. Caùch nhieät goàm beà maët vaø keo traùt phaûi tuaân theo qui ñònh FSD. Caùch nhieät khoâng ñöôïc loä ra ngoaøi luoàng gioù. Toaøn boä ñinh oác kim loaïi vaø phuï kieän keïp chaët khoâng xuyeân qua baûng ñeå coù theå taïo thaønh caàu truyeàn nhieät. Caùc baûng ñöôïc giöõ coá ñònh baèng caùc phuï kieän keïp chaët coù cô caáu keïp nhanh hoaëc thanh giöõ hoaëc laép vaøo khuoân baèng naém khoaù vaø ñöôïc nieâm baèng ñeäm loùt. Cung caáp cöûa baûo trì ñuû ñeå thöïc hieän coâng taùc baûo trì. Coù theå tieáp caän beân trong moãi thieát bò vaø khaû naêng tieáp caän phaûi ñöôïc Tö vaán chaáp thuaän. Voû beân ngoaøi phaûi ñöôïc môû roäng cho caùc hoäp loïc ñeå laép ñaët löôùi loïc gioù. Caùc baûng phaûi vöøa vôùi khuoân vaø toaøn boä moái noái cuûa baûng phaûi ñöôïc nieâm kín baèng ñeäm ngaên nöôùc vaø gioù maø khoâng gaây ngöng tuï treân beà maët baûng. Ñeäm phaûi khoâng quaù neùn khi baûng hoaït ñoäng vaø coù theå trôû laïi ñoä daøy ban ñaàu khi baûng ngöøng hoaït ñoäng. Toaøn boä bulon vaø ñai oác ñöôïc söû duïng phaûi laø loaïi theùp khoâng gæ hoaëc theùp maï catmi saùng. Neáu thieát bò ñöôïc ñaët beân ngoaøi, voû phaûi ñöôïc sôn baèng maøu saéc ñöôïc Tö vaán chaáp thuaän. Toaøn boä panel phaûi coù theå thaùo rôøi ñöôïc. Tuy nhieân, nhöõng panel khoâng ñöôïc chæ ñònh nhö cöûa soå baûo trì nhanh coù theå ñöôïc baét bulon chaéc vaøo khuoân. Cöûa soå baûo trì nhanh phaûi ñöôïc noái tröø phi bò caám tieáp caän maùy moùc thieát bò. Cöûa soå baûo trì nhanh phaûi coù khoaù taïo neân nieâm an toaøn giöõa khung, ñeäm vaø panel. Cöûa soå baûo trì nhanh bao goàm boä phaän loïc, daøn laïnh, quaït vaø boä phaän truyeàn. Toaøn boä keát caáu cuûa cöûa soå baûo trì nhanh bao goàm gaén coá ñònh khôùp noái vaø khoaù seõ khoâng taïo thaønh caàu laïnh giöõa phaàn beân trong vaø beân ngoaøi PAU. Caùc cöûa soå baûo trì chính phaûi ñöôïc cung caáp cho caùc boä phaän quaït, loïc, boä phaän tieáp caän vaø baát kyø boä phaän naøo theo qui ñònh. Toaøn boä thieát bò ñöôïc gaén treân khung ñeá saét coù raõnh. Toaøn boä keát caáu voû PAU phaûi tuaân theo DW142 loaïi B. Giaáy chöùng nhaän/ baùo caùo thöû nghieäm phaûi ñöôïc ñeä trình khi Tö vaán yeâu caàu. Saøn beân trong thieát bò phaûi ñöôïc xuùc röûa vaø khoâng coù gôø taïi cöûa thaêm. Thieát bò phaûi ñöôïc ñaët loã xaû khoâng gaây ngheõn. Möùc ñoä giaûm ñoä oàn toång quaùt cho thieát bò khoâng ñöôïc nhoû hôn nhöõng thoâng soá sau:

Taàn soá Octave(Hz)

63 125 250 500 1k 2k 4k 8k

SRI(dB) 22 24 29 32 31 35 42 44




Möùc ñoä giaûm ñoä oàn phaûi ñöôïc ñeä trình khi ñaáu thaàu vaø phaûi ñöôïc chöùng nhaän bôûi nhaø saûn xuaát PAU. Nhaø thaàu phuï phaûi baûo ñaûm taát caû caùc loã duøng cho muïc ñích kieåm tra vaø ño löôøng phaûi ñöôïc thöïc hieän taïi xöôûng cuûa nhaø saûn xuaát vaø ñöôïc gia coá lôùp voû beân trong vaø beân ngoaøi, ñöôïc noái ren theo qui ñònh. Toaøn boä khung kim loaïi phaûi ñöôïc sôn choáng aên moøn sau khi cheá taïo. Taïi xöôûng cuûa nhaø saûn xuaát, tröôùc khi ñoùng goùi vaø vaän chuyeån, PAU phaûi ñöôïc hoaøn thieän baèng lôùp sôn phuû maøu. Thieát bò phaûi ñöôïc hoaøn thieän beân trong baèng lôùp sôn phuû traéng. Nhaø thaàu phuï phaûi baûo ñaûm raèng toaøn boä PAU phaûi ñöôïc ñoùng goùi vaø baûo veä tröôùc khi vaän chuyeån ñeán coâng tröôøng. Hôn nöõa, khi vaän chuyeån ñeán coâng tröôøng, PAU phaûi ñöôïc baûo veä khoâng bò hö hoûng cho ñeán khi hoaøn thaønh vaø baøn giao cho Tö vaán. Baát kyø söï hö hoûng naøo cuûa beà maët hoaøn thieän xaûy ra trong quaù trình vaän chuyeån, laép ñaët, v.v. phaûi ñöôïc söûa chöõa hoaøn chænh theo caùch thöùc do nhaø saûn xuaát ñeà xuaát vaø theo pheâ duyeät cuûa Tö vaán.

(c) Ngaên cöûa thaêm Cung caáp ngaên cöûa thaêm ñeå thoåi gioù hoaëc hôi vaøo cuoän coil ñeå laøm veä sinh hoaëc khöû truøng. Cung caáp ngaên cöûa thaêm töông xöùng cho phaàn treân vaø phaàn döôùi cuûa coil ñeå deã daøng veä sinh vaø khöû truøng. Ngaên cöûa thaêm ñöôïc caáu taïo daïng hoäp coù cöûa gaén baûn leà caùch nhieät.

(d) Quaït Tröø phi ñöôïc qui ñònh khaùc ñi trong Baûng döõ lieäu kyõ thuaät, quaït gioù ñöôïc cung caáp phaûi laø loaïi khoå roäng, hai ngoõ vaøo, nhieàu caùnh, caùnh loaïi ly taâm doác veà phía sau hoaëc caùnh ñoäng löïc, tuaân theo yeâu caàu qui ñònh trong phuï khoaûn veà “Quaït” trong Quy phaïm Kyõ thuaät naøy. Ñoái vôùi thieát bò choáng oàn qui ñònh trong Baûng döõ lieäu kyõ thuaät, quaït laø loaïi khoå ñôn, moät ngoõ vaøo, caùnh ñoäng löïc vôùi ñieåm oàn ñaët taïi ñaàu huùt cuûa quaït, taïi khoaûng caùch löïa choïn tröôùc, vôùi vai troø laø moät phaàn cuûa ñoä daøi soùng cuûa taàn soá oàn hôn. Toaøn boä ñoaïn xaû quaït vaø oáng phaân phoái gioù phaûi ñöôïc noái vaøo hoäp baèng oáng noái meàm. Vieäc laép raùp quaït vaø moâtô phaûi ñöôïc gaén treân khung ñeá maï keõm nhuùng noùng, caùch ly khoûi khung chính baèng nhöõng boä caùch ly choáng rung nhö qui ñònh trong phaàn “Ñoä oàn vaø rung ñoäng” cuûa Quy phaïm Kyõ thuaät naøy. Cöûa baûo trì phaûi ñöôïc cung caáp cho ñoaïn quaït, cho pheùp deã daøng baûo trì quaït vaø moâtô vaø coù theå thaùo dôõ caùc thieát bò quaït khoûi hoäp. Nhöõng maët phaúng khaùc phaûi di chuyeån ñöôïc, ñoaïn baùnh ñai ñöôïc ñaët taïi vò trí keá caän cöûa baûo trì. Boä daãn ñoäng phaûi ñöôïc cung caáp khung che. Moâtô phaûi ñöôïc ñaët treân thanh tröôït ñeå coù theå caên chænh ñoä caêng daây ñai.




(e) Daøn coil laïnh Daøn coil laïnh ñöôïc laøm baèng oáng ñoàng khoâng moái noái, cöôøng ñoä chòu löïc cao, ñöôøng kính voøng ngoaøi cuûa oáng laø 12mm coù laù taûn nhieät ñöôïc haøn nhoâm baèng phöông phaùp cô hoïc hoaëc thuûy löïc. Ñöôïc caáp löu löôïng nöôùc laïnh, ñaàu hoài, ñaàu noái, van xaû nöôùc vaø oáng thoâng gioù taïi ñieåm cao nhaát. Ñoaïn coil phaûi ñöôïc saép xeáp ñeå di chuyeån coil khoûi maët tieáp caän cuûa ñoaïn coil. Neáu coil ñöôïc laép ñaët noái tieáp nhau, phaûi laép maùng höùng phía döôùi moãi ñoaïn. Coil phaûi chia gioù theo phöông thaúng ñöùng taïi vò trí qui ñònh vaø caàn thieát cho phuø hôïp vôùi khoâng gian phoøng maùy. Phaûi cung caáp ñuû choã cho daøn coil laïnh nhaèm ngaên chaën hôi aåm lô löûng trong khoâng khí chuyeån thaønh luoàng gioù. Toác ñoä toái ña beà maët daøn coil laïnh phaûi laø 2.5 m/s. Toác ñoä nöôùc toái ña vaø toái thieåu phaûi laø 2.4 m/s vaø 0.3 m/s. Toaøn boä coil phaûi ñöôïc gaén vaøo PAU maø khoâng coù maïch voøng bypass xung quanh coil. Cung caáp ñeäm loùt ñöôïc Tö vaán chaáp thuaän xung quanh chu vi cuûa moãi coil. Truï ñôõ coil phaûi ñöôïc saép xeáp sao cho khoâng xuyeân qua khay nöôùc ngöng tuï vaø nöôùc ngöng tuï khoâng chaûy xuoáng maùng höùng. Khoâng ñeå xaûy ra söï tieáp xuùc giöõa caùc kim loaïi khoâng töông thích. Taùch rieâng caùc loaïi vaät lieäu baèng ñeäm neoprene. Coil lôùn phaûi coù truï ñôõ trung gian. Soá doøng vaø fin trong moãi 25.4mm khoâng ñöôïc vöôït quaù 6 hoaëc 10. Daøn coil phaûi coù aùp löïc laøm vieäc khoâng thaáp hôn möùc ñoä ñöôïc qui ñònh trong Baûng döõ lieäu kyõ thuaät hoaëc 1000 kPa (baát kyø thoâng soá naøo lôùn hôn). Toaøn boä daøn coil phaûi ñöôïc thöû nghieäm gioù baèng caùch dìm xuoáng nöôùc vôùi aùp löïc vaän haønh baèng 1,5 laàn hoaëc 1500 kPa (baát kyø thoâng soá naøo lôùn hôn). Ñaàu noái coil phaûi ñöôïc gaén kín baèng ñai vaø taám taïi vò trí xuyeân qua taám coù keát caáu nhieàu lôùp. Hieäu suaát cuûa coil phaûi ñöôïc chöùng nhaän theo tieâu chuaån BS 5141 hoaëc ARI 410

(f) Maùng höùng Maùng höùng phaûi ñöôïc thieát keá vaø laép ñaët theo ñeà xuaát trong CIBSE TM-13. Khay thu nöôùc phaûi doác ñeå ñaåy nöôùc chaûy nhanh vaø coù theå thaùo rôøi töøng caùi ñeå veä sinh. Ñaàu noái oáng xaû nöôùc khoâng ñöôïc loài ra phía treân ñaùy maùng nhaèm ngaên chaën söï xaû nöôùc. Maùng höùng duøng cho daøn coil laïnh phaûi keùo daøi ñeán naép cuûa caùc oáng goùp. Maùng höùng ñöôïc laøm töø theùp khoâng gæ, ñoä daøy 1.2mm, loaïi 304, coù moái noái giaèng kín nöôùc, ñöôïc caùch nhieät baèng lôùp caùch nhieät daïng toå ong kín daøy 25mm, coâng suaát nhieät toái ña laø 0.02W/m2.K ôû nhieät ñoä 10oC nhaèm ngaên chaën söï ngöng tuï nöôùc. Maùng höùng phaûi ñöôïc noái vôùi oáng xaû baèng pheãu thu daïng baãy xuyeân qua loã thoâng gioù. Nieâm kín baãy phaûi coù toác ñoä toái thieåu laø 50mm hoaëc cao hôn aùp suaát toái ña quaït 25mm, baát kyø toác ñoä naøo lôùn hôn. Cung caáp maùng xaû nöôùc trung gian taïi moãi lôùp cuûa daøn coil laïnh thoaùt nöôùc vaø ñöôøng xaû nöôùc noái vaøo maùng xaû nöôùc chính. Maùng phaûi coù meùp vaø naép döïng ñöùng nhaèm ngaên nöôùc chaûy traøn.

(g) Phin loïc gioù




Phin loïc gioù phaûi tuaân theo qui ñònh trong phaàn “Phin loïc gioù” cuûa Quy phaïm Kyõ thuaät naøy.

(h) Hoäp phin loïc gioù Hoäp oáng loïc gioù phaûi ñöôïc saûn xuaát vaø laép raùp taïi nhaø maùy. Hoäp phin loïc gioù phaûi söû duïng cöûa baûo trì, ñöôøng nhoâm ñuùc vaø khung giöõ ñöôïc thieát keá ñeå chöùa loïc gioù coù kích thöôùc tieâu chuaån vaø coâng suaát qui ñònh cho laép ñaët. Hoäp phin loïc gioù cho pheùp söû duïng laãn loän nhieàu phin loïc gioù cuûa nhieàu nhaø saûn xuaát. Hoäp phin loïc gioù phaûi ñöôïc trang bò cöûa coù baûn leà, coù khoaù ôû moät phía vôùi cuøng loaïi vaät lieäu söû duïng cho caùc baûng. Khung chaân ñeá phin loïc gioù phaûi laøm baèng theùp maï keõm, ñeäm loùt haøn polyvinyl chloride laép taïi xöôûng, ñöôïc thieát keá ñeå chöùa khung giöõ vaø loaïi boû maïch voøng bypass. Khung chaân ñeá oáng loïc gioù phaûi bao goàm ñöôøng loïc saün tích hôïp duøng cho oáng loïc saün theo qui ñònh trong Baûng döõ lieäu kyõ thuaät. Khung giöõ phaûi ñöôïc laøm töø theùp maï keõm ñoä daøy 16 gauge, ñöôïc cung caáp ñeäm loùt vaø khoaù ñeå ngaên chaën maïch voøng bypass giöõa oáng loïc gioù vaø khung, giöõa caùc khung keá caän vaø giöõa khung vaø hoäp. Khung giöõ coù theå khoaù ñeå giöõ baát kyø loaïi loïc gioù naøo maø khoâng phaûi duøng ñeán bulon vaø ñinh vít rieâng Toaøn boä oáng loïc gioù phaûi ñöôïc döïng neân vaø nieâm kín beân trong luoàng gioù sao cho khoâng xaûy ra roø ræ khoâng khí xung quanh boä loïc gioù hoaëc oáng loïc gioù.

(i) Nhaõn nhaän daïng Toaøn boä PAU phaûi ñöôïc cung caáp nhaõn nhaän daïng moâ taû maõ soá cuûa moãi thieát bò nhö qui ñònh treân phaùc ñoà heä thoáng. Nhaõn naøy phaûi ñöôïc gaén chaéc chaén vaøo voû PAU taïi vò trí deã thaáy nhaát. Hôn nöõa, moãi thieát bò phaûi coù nhaõn cuï theå chæ ra toaøn boä chi tieát veà kích thöôùc quaït, rpm, ampe, ñöôøng kính caùnh coâng taùc, ñaëc tính quaït, chaát boâi trôn, löu löôïng gioù vôùi coâng suaát qui ñònh, kích thöôùc baùnh ñai vaø daây ñai, coâng suaát coil, caáp ñoä oáng loïc, coâng suaát doøng nöôùc, nhieät ñoä thieát keá vaø nhöõng thoâng tin khaùc theo yeâu caàu cuûa Tö vaán. Nhaõn naøy cuõng phaûi ñöôïc gaén chaéc vaøo voû PAU. PAU cuõng coù nhaõn teân neâu teân nhaø saûn xuaát, soá xeâri, soá model vaø ngaøy saûn xuaát.

(j) Baûo veä trong quaù trình vaän chuyeån vaø laép döïng Beà maët coil phaûi ñöôïc baûo veä baèng taám Masonite hoaëc taám theùp gaén taïi xöôûng nhaèm ngaên chaën söï hö hoûng laù nhoâm taûn nhieät hoaëc oáng tröôùc khi thöû nghieäm vaø nghieäm thu.




5.5 FCU (FAN COIL UNITS) (a) Toång quaùt

FCU coù coâng suaát nhö ñöôïc lieät keâ trong Baøng döõ lieäu kyõ thuaät vaø nhö ñöôïc xaùc nhaän bôûi ARI/ASHRAE. Toaøn boä oáng duøng cho FCU phaûi ñöôïc caùch ly baèng oáng loùt cao su taïi nhöõng vò trí oáng ñöôïc treo hoaëc gaén vaøo khung keát caáu. FCU vaø khung keát caáu khoâng ñöôïc gaén coá ñònh vôùi nhau. FCU phaûi phuø hôïp vôùi trôû löïc thöïc teá taùc ñoäng leân löu löôïng gioù cuûa thieát bò do oáng gioù, vaø mieäng gioù. Trôû löïc boå sung naøy ñöôïc duøng cho nhöõng FCU ñaáu noái hoaëc khoâng ñaáu noái vôùi oáng gioù vaø phaûi ñaït möùc toái thieåu laø 50 Pa (taùc ñoäng beân ngoaøi thieát bò). FCU phaûi laø loaïi aâm traàn nhö ñöôïc qui ñònh trong Baûng döõ lieäu kyõ thuaät, bao goàm daøn laïnh, quaït ly taâm vaän haønh baèng moâtô ñieän vaø maùng thoaùt nöôùc ngöng tuï.

(b) Daøn coil Daøn coil laïnh ñöôïc laøm baèng oáng ñoàng, ñöôøng kính voøng ngoaøi cuûa oáng laø 12mm, coù laù taûn nhieät ñöôïc haøn nhoâm baèng phöông phaùp cô hoïc hoaëc thuûy löïc. Daøn coil phaûi coù aùp löïc laøm vieäc khoâng thaáp hôn möùc ñoä ñöôïc qui ñònh trong Baûng döõ lieäu kyõ thuaät hoaëc 1000 kPa (baát kyø thoâng soá naøo lôùn hôn). Daøn coil ñöôïc caáp oáng thoâng gioù ñaët taïi ñieåm cao nhaát vaø van xaû nöôùc. Soá löôïng daõy daøn coil khoâng ñöôïc ít hôn ba nhöng khoâng ñöôïc nhieàu hôn boán. Toaøn boä daøn coil phaûi ñöôïc thöû nghieäm baèng caùch dìm xuoáng nöôùc vôùi aùp löïc vaän haønh baèng 1,5 laàn hoaëc 1500 kPa (baát kyø thoâng soá naøo lôùn hôn).

(c) Quaït Cung caáp cho moãi FCU moät hoaëc nhieàu quaït ly taâm, caùnh cong höôùng veà phía sau, caùnh baèng nhoâm, caân baèng tónh hay ñoäng, ñöôïc ñieàu khieån tröïc tieáp töø moâtô tuï ñieän chia 1 pha. Moâtô phaûi laø loaïi oå truïc loùt, coù 3 toác ñoä, coù bình chöùa daàu vaø oáng daàu keùo daøi coù theå tieáp caän vaø söû duïng baûo veä quaù nhieät. Voû quaït ñöôïc laøm baèng theùp maï keõm

(d) Moâtô Moâtô quaït phaûi laø loaïi tuï ñieän chia, phuø hôïp cho vieäc cung caáp ñieän 1 pha vôùi heä soá ñieän khoâng döôùi 0.85. Moâtô phaûi ñöôïc gaén ñaøn hoài vaøo khay hoaëc cuoän quaït. Vieäc laép raùp khay moâtô/ quaït cuõng phaûi ñöôïc gaén ñaøn hoài vaøo khung daïng hoäp. Khay phaûi deã daøng thaùo rôøi ñeå kieåm tra vaø baûo trì sau khi thaùo rôøi khoûi nguoàn cung caáp chính, phuï, oå caém. Moâtô phaûi coù khaû naêng cung caáp toái thieåu 3 laàn toác ñoä quaït (coäng theâm cheá ñoä môû/ taét) vaø coù ñuû coâng suaát nhaèm ngaên chaën quaù taûi ôû baát kyø toác ñoä hoaëc coâng suaát naøo cuûa quaït.




(e) Phin loïc gioù Phin loïc gioù phaûi tuaân theo qui ñònh trong phaàn “Phin loïc gioù” cuûa Quy phaïm Kyõ thuaät naøy. Nhöõng phin loïc gioù taïm thôøi seõ ñöôïc cung caáp cho taát caû caùc thieát bò coù phin loïc saûn xuaát taïi nhaø maùy. Nhöõng phin loïc naøy seõ ñöôïc laép ñuùng vò trí thay theá trong suoát thôøi giant hi coâng vaø chaïy thou vaø noù chæ ñöôïc thay theá baèng phin loïc chính haõng sau khi hoaøn taát giai ñoaïn nghieäm thu.

(f) Maùng höùng Coâng taùc thieát keá vaø laép ñaët maùng höùng phaûi tuaân theo ñeà xuaát trong boä tieâu chuaån CIBSE-TM13. Cung caáp maùng höùng caùch nhieät ñeå thu nöôùc ngöng töø daøn laïnh bao goàm oáng goùp vaø oáng cong hoài, neáu caàn. Cung caáp maùng höùng phuï ñeå baûo ñaûm thoaùt nöôùc hoaøn toaøn vaø khoâng coù nöôùc ngöng tuï taïi nhöõng nôi coù ñieàu hoaø khoâng khí. Maùng höùng phaûi laøm baèng theùp maï keõm cöôøng ñoä cao. Maùng höùng phaûi ñöôïc caùch nhieät vôùi ñoä daøy caùch nhieät toái thieåu laø 25mm theo yeâu caàu cuûa tö vaán.

(g) Cöûa baûo trì Cung caáp cöûa baûo trì taïi ñaàu oáng gioù caáp vaø oáng gioù hoàiù sao cho coù theå thaùo moâ tô quaït vaø lau daøn coil laïnh maø khoâng caàn phaûi thaùo gôõ FCU.

(h) Voû maùy Voû maùy phaûi ñöôïc saûn xuaát taïi nhaø maùy, laøm baèng taám theùp coù thanh giaèng daøy 1.0mm coù meùp taïo raõnh. Taám ôû ñaùy ñöôïc gaén baûn leà ñeå deã tieáp caän. Voû maùy ñöôïc ñöôïc lau, trung hoaø vaø xöû lyù baèng phoát phaùt. Coâng taùc sôn phuû bao goàm sôn loùt, roài ñeán lôùp sôn phuû vaø lôùp hoaøn thieän baèng men. Neáu thieát bò ñöôïc gaén taïi nhöõng vò trí deã thaáy, voû tuû phaûi ñöôïc trang trí baèng maøu saéc ñöôïc Tö vaán chaáp thuaän. Tröø phi ñöôïc qui ñònh khaùc, toaøn boä thieát bò treo treân traàn theo phöông ngang phaûi coù voû hoäp gioù caáp vaø hoài. Theo tieâu chuaån, nhöõng hoäp gioù naøy ñöôïc cung caáp ñaàu noái oáng gioù ôû vò trí phía tröôùc vaø sau thieát bò. Coâng taùc thieát keá vaø saûn xuaát voû hoäp phaûi ñöôïc thöïc hieän sao cho coù theå thay ñoåi söï saép xeáp tieâu chuaån, neáu caàn, ñeå cung caáp gioù hoài töø ñaùy voû chæ baèng caùch di chuyeån cöûa phía sau ñeán ñaùy cuûa thieát bò. Voû maùy/ hoäp gioù phaûi coù ñuû cöûa soå baûo trì cho oáng loïc gioù, daøn coil, quaït, v.v. Tröø phi ñöôïc qui ñònh khaùc treân baûn veõ, vieäc laøm veä sinh oáng loïc gioù thöôøng ñöôïc thöïc hieän baèng caùch môû loõi trung taâm gaén baûn leà cuûa mieäng gioù hoài. Khung chaân ñeá cuûa mieäng gioù seõ bao goàm phin loïc gioù. Maët trong voû phaûi ñöôïc loùt microbus daøy 25mm vaø ñöôïc nieâm kín nhaèm ngaên chaën söï ngöng tuï nöôùc. Lôùp caùch nhieät phaûi ñöôïc baûo veä traùnh söï xaâm nhaäp cuûa sôïi trong luoàng gioù. Neáu cung caáp voû tuû nhaäp, nhöõng qui ñònh caùch nhieät do nhaø saûn xuaát ñöa ra coù theå ñöôïc chaáp thuaän, mieãn laø nhöõng thoâng tin naøy ñöôïc ñeä trình cho Tö vaán pheâ duyeät tröôùc khi ñaët haøng.




5.6 HOÄP ÑIEÀU KHIEÅN LÖU LÖÔÏNG GIOÙ (VAV BOXES) (a) Toång quan

Bao goàm hoäp gioù caáp vaø boä ñieàu khieån löu looing thay ñoåi vaø chöùng nhaän kieåm tra taïi nhaø maùy. Cung caáp motô hôû IP32 hoaëc TEFC. Cung caáp truïc daãn ñoäng theùp ñöôïc tieän chính xaùc vaø boùng ñeå khoâng coù dung sai khi tieáp xuùc vôùi baùnh raêng. Giöõ chaët VCD treân truïc truyeàn ñoäng baèng choát. Caáu taïo baùnh ñaø baèng theùp deûo (mild steel), theùp nhuùng keõm noùng, vaø hoaøn thieän vôùi 2 lôùp sôn taïi nhaø maùy. Boä truyeàn ñoäng ñöôïc noái ñaát ñeå traùnh tích tónh ñieän.

(b) Voû maùy Voû seõ ñöôïc caùch ly hoaøn toaøn, caáu truùc vaùch ñoâi. Voû ñöôïc laøm baèng theùp maï keõm, daøy toái thieåu 1.31mm vaø gia cöôøng bean trong baèng khung theùp goùc. Beà maët hoaøn thieän vôùi toái thieåu 2 lôùp phuû choáng aên moon ( 1 lôùp maï keõm vaø 1 lôùp sôn polyester). Hoaøn thieän vôùi 1 lôùp maï keõm . Voû VAV ñöôïc caùch aâm trong baèng boâng thuûy tinh tyû troïng 64-96kg/m3daøy 50mm. Laép ñaët chaéc chaén beà maëtt voû maùy vaø khung ñôõ baèng chaát keát dính treân toaøn boä beà maët. Foam caùch nhieät ñöôïc chaáp nhaän ñeå thay theá boâng thuûy tinh vôùi khaû naêng caùch aâm vaø caùch nhieät töông ñöông vôùi boâng thuûy tinh nhö ñaõ chæ ñònh. Ñaày ñuû roong ñeäm töøng maùy giöõa caùc maët bích vaø sieát chaët cuøng vôùi voøng ñeäm, ñai oác vaø bulong ñeå ñaûm baûo kín khí. Laáp kín taát caû nhöõng loã môû xueân qua voû maùy, nhö oáng luoàn day ñieän vôùi voøng cao su hay laáp kín baèng caùch ñaép theâm moät taám ñeå traùnh söï ñi qua cuûa khoâng khí vaø tieáng oàn.

(c) Hoäp thoåi gioù Cung caáp hoäp thoåi gioù vôùi caáu truùc phuø hôïp. Caùch aâm beà maët trong vôùi boâng thuûy tinh daøy 50mm. Cung caáp vaùch kim loaïi ñuïc loã beân trong daøy 1.15mm (Dieän tích loã môû töø 20%-30%).

5.7 THIEÁT BÒ BIEÁN TAÀN (VSD) (a) Toång quan

Phuø hôïp vôùi chöông caùc yeâu caàu chung. Yeâu caàu kyõ thuaät naøy aùp duïng cho caùc boä daãn ñoäng ñôn giaûn cuûa quaït vaø bôm ly taâm nhöõng nôi maø coâng suaát thay ñoåi theo laäp phöông cuûa toác ñoä. Noù khoâng duøng cho caùc loaïi baêng taûi hay maùy moùc khaùc.

Nhöõng chöông lieân quan: - Ñieàu khieån heä thoáng cô khí. - Tuû ñieän cho heä thoáng cô khí. - Ñoä oàn vaø rung ñoäng

Tieâu chuaån aùp duïng:




Tieâu chuaån AS/NZS 60947.1 Tuû ñieän haï aùp – caùc nguyeân taéc chung. (b) Chaát löôïng

Nhaø thaàu seõ phaûi ñeä trình nhöõng taøi lieäu sau: - Giaáy chöùng nhaän laøm ñuùng theo töøng tieâu chuaån ñaõ aùp duïng. - Taát caû nhöõng baûn baùo caùo kieåm tra thieát bò. - Giaáy chuùng nhaän cuûa nhaø saûn xuaát veà cheânh nhieät ñoä motor seõ khoâng

vöôït quaù tieâu chuaån AS1359:101, Giôùi haïn nhieät ñoä caáp B khi vaän haønh taïi cheá ñoä ñieàu khieån nay taûi.

- Baûn veõ thi coâng, chi tieát kích thöôùc laép ñaët thieát bò vaø caùc khoaûng caùch yeâu caàu thoâng thoaùng

- Höôùng daãn laép ñaët vaø ñaáu day cuûa nhaø saûn xuaát cuûa nhaø saûn xuaát. Kieåm tra - Kieåm tra trong voøng 1 giôø taïi nhieät ñoä moâi tröôøng 40oC töø khoâng taûi ñeán

ñaøy taûi. (c) Boä ñieàu toác

Moâ taû Loaïi: Hôïp boä bao goàm boä thay ñoåi ñieän aùp ñieän töû, boä ñieàu toác ñoäng cô qua taàn soá, caûm khaùng vaø boä loïc. Nhöõng môtô coù theå cung caáp troïn boä motô/boä ñieàu khieån ñöôïc öu tieân. AÙp duïng: khôûi ñoäng nhieãn vaø ñieàu khieån toác ñoä thay ñoåi. Löïa choïn: Phuø hôïp vôùi taûi/ moment xoaén cho caùc ñoäng cô, caùc taûi theo töøng ñieàu kieän vaän haønh. Caáu hình: Cung caáp 1 boä ñieàu khieån rieâng bieät cho moãi motô ngoaïi tröø khi coù yeâu caàu khaùc.

Coâng suaát vaø ñaëc tuyeán Loaïi taûi: Momen xoaén thay ñoåi cho quaït höôùng truïc hay quaït ly taâm hay bôm ly taâm Doøng ñieän ra lieân tuïc: lôùn hôn hoaëc baèng doøng nay taûi taïi 380V50Hz theå hieän taïi nhaõn motô. Moment khôûi ñoäng lôùn hôn 70% cuûa moment ñaày taûi. Ñieàu khieån doøng ñieän khôûi ñoäng toái da: 130% cuûa doøng ñaày taûi. Daûi thay ñoåi taàn soá: töø 0 ñeán 50Hz. Nhieät ñoä moâi tröôøng xung quanh max. 40oC. Boä ñieàu khieån vaän haønh taïi cheá ñoä ñaày taûi, toác ñoä toái ña vaø ñöông nhieân vôùi 20% quaù taûi trong 30 giaây maø khoâng giaûm motô hay boä ñieàu khieån. Ñoä aåm moâi tröøông: <95%. Heä soá dòch chuyeån taïi baát kyø toác ñoä hoaëc taûi naøo: toái thieåu 0.98 Toång heä soá coâng suaát taïi ñaày taûi motô vaø taïi taát caû toác ñoä toái thieåu 0.9 Hieäu suaát toång cuûa bieán taàn bao goàm caû toån hao boä loïc toái thieåu 97% Caáp ñoä oàn – Möùc taêng ñoä oàn toái ña khi vaän haønh taïi baát kyø toác ñoä, taûi naøo khi so saùnh vaän haønh taïi 50Hz laø 5dB taïi baát kyø daûi aâm thanh 8 (Octave band).




Voû hoäp: Boä ñieàu khieån, boä loïc vaø phuï kieän laép ñaët thoâng thöôøng ñöôïc cung caáp bôûi cuøng nhaø saûn suaát. Keøm theo chöùng nhaän theo AS 60529-2004: trong nhaø theo IP54, ngoaøi trôøi theo IP65. Nhöõng boä ñieàu khieånnhoû coù theå tích hôïp theo ñoäng cô

Caùc thaønh phaàn chính - Chænh löu: 6 nhòp, haïn cheá hay khoâng. Choïn löïa ñeå phuø hôïp aâm. - Töông thích tröôøng vaø töø, kieåm soaùt heä soá coâng suaát vaø soùng haøi. - Töø pha ñeán pha vaø töø pha ñeán baûo veä sung ñieän aùp

Ñieän vaøo Dung sai hoaït ñoäng: Boä ñieàu khieån ñeå hoaït ñoäng lieân tuïc taïi cheá ñoä ñaày taûi vôùi dung sai taàn soá vaø ít bieán ñoåi. Nguoàn caáp ñieän chính: 220V, 380V, ±10%, 50Hz, ±2 Hz, 3 pha xoay chieàu. Nguoàn ñieän khaån caáp: 220V, 380V±20%, 50Hz ±5Hz, 3 pha xoay chieàu. Cho pheùp ñoä suït aùp töø nguoàn caáp ñeán boä ñieàu khieån laø 0-5% Dung sai ngaén maïch: 0.5 s

Ñieän ra Doác ñieän aùp: Naêng löôïng ñöôïc toái öu thay ñoåi tyû leä V/Hz cho qui luaät laäp phöông moái quan heä giöõa coâng suaát ñieän vaø toác ñoä, vôùi khôûi ñoäng öu tieân Buø aùp: Töï ñoäng hieäu chænh ñaàu ra cuûa ñieän aùp trong suoát quaù trình thay ñoåi trong phaïm vi dung sai ñeå traùnh toån thaát momen motô hay toác ñoä. Caùc böôùc ñieän aùp ra vaø sung ñieän aùp: Theo IEC 60034.17, Tyû leä taêng ñieän aùp toái ña: motors <= 4kW – 500V/μs.

motors > 4kW – 1000V/ μs

Caùc soùng haøi: Phuø hôïp vôùi yeâu caàu cuûa nhaø chöùc traùch vaø qui ñònh veà ñieän quoác gia. Tieâu chuaån: Theo AS/NZS 61000.3.6 tính töông thích töø tröôøng (EMC) – giôùi haïn – Ñaùnh giaù giôùi haïn phaùt ra cho bieán daïng taûi trong heä thoáng trung theá vaø cao theá. Yeâu caàu laép ñaët phaûi phuø hôïp vôùi tieâ chuaån AS/NZS 61000.3.3 giôùi haïn 2 Toång bieán daïng soùng haøi : cao nhaát 5%.

Heä thoáng ñieàu khieån vaø giaùm saùt: Kieåu ñieàu khieån; Kyõ thuaät soá hoaøn toaøn vôùi maïch vi xöû lyù ñieàu khieån taàn soá. Laäp trình: Caøi ñaët vaø hieäu chænh ô boä nhôù taïm (EEPROM), khoâng coù baát kyø ñieàu chænh ñieän aùp hay tín hieäu töông töï. Baøn phím: 3 cheá ñoä ñieàu khieån baèng tay – taét – töï ñoäng, baùo ñoäng vaø bieåu hieän chöùc naêng vôùi chöông trình maät maõ baûo veä. Hieån thò cuïc boä: Ñeøn LED beân ngoaøi hay maøn hình LCD cuûa chöông trình, vaân haønh, thôøi gian loãi vaø nguyeân nhaân, tröôùc khi “trip” vaø bieåu hieän thoâng tin hieån thò lieân tuïc cuûa taàn soá ñaàu ra. Ñieàu khieån töø xa vaø hieån thò; Ñieàu khieån taét-môû, traïng thaùi vaø baùo loãi chung vaø hieån thò toác ñoä.




Ñieàu khieån toác ñoä; Ñieàu khieån maïch hôû ñeå duy trì ±0.1% cuûa toác ñoä motô vöôït quaù daûi toác ñoä motô. Tín hieäu ñaàu vaøo: 0-10V moät chieàu hay 0-20mA moät chieàu. Caûnh baùo: Tieáp ñieåm caûnh baùo loãi chung khoâng ñieän môûi ra trong tröôøng hôïp coù loãi ñeå ñaàu noái vaøo heä thoáng ñieàu khieån cô khí. Giao dieän ñieàu khieån vaø hoäp ñaáu noái: Rieâng reõ töø hoäp ñaáu noái ñieän

Chöùc naêng cuûa heä thoáng ñieàu khieån Cung caáp ñaày ñuû nhö sau: Rieâng reõ vaø ñoäc laäp khaû naêng ñieàu chænh toái ña vaø toái thieåu toác ñoä caøi ñaët taïi 50Hz vaø 20 Hz theo thöù töï ñònh saün, ngoaïi tröø coù nhöõng yeâu caàu khaùc. Ñieàu chænh taêng giaûm thôøi gian ñoäc laäp töø 0 ñeán 80s Doøng giôùi haïn ñeå traùnh “trip” do doøng quaù taûi taïm thôøi. Cheá ñoä chaùy maëc ñònh: Quaït yeâu caàu cho cheá ñoä chaùy chaïy taïi toác ñònh saün vôùi motô ñöôïc baûo veä vaø boä ñieàu khieån, khoâng baûo veä nhöõng loãi nhoû (nhö quaù nhieät) theo tieâu chuaån As1668.1, kieåm soaùt hoûa hoaïn vaø khoùi trong toøa nhaø coù nhieàu khoang. Phuø hôïp vôùi ñieàu 4.8.1, 4.12.1, 4.12.3 va 5.5.5. Cung caáp boä khôûi ñoäng cheá ñoä hoûa haoïn vaø tieáp ñieåm noái taét. Töï ñoäng khôûi ñoäng sau khi maát ñieän hay phuïc hoài töï söï coá hö hoûng ngaén haïn, vôùi 3 laàn coá gaéng töï khôûi ñoäng. Taét vaø baùo hieäu söï coá ñeán khôûi ñoäng. Löu laïi caùc söï coá ( toái thieåu 3 söï kieän) vôùi thôøi gian vaø ngaøy xaûy ra vaø chi tieát hieän töôïng vaø chaån ñoùan lyù do gay ra maát ñieän Kôûi ñoäng cho ñoäng cô xoay chieàu vôùi phaàn ñieàu khieån gia toác taêng hay giaûm neáu ñoäng cô xoay thuaän hay ngöôïc chieàu.

Baûo veä söï coá Cung caáp heä thoáng giaùm saùt söï coá, taét maùy ñoät ngoät, vaø hieån thò treân baûng baùo hieän töôïng: Maát pha chính. Baûo veä ñieän xoay chieàu vaøo thaáp aùp. Baûo veä ñieän xoay chieàu vaøo quaù aùp. Boä bieán taàn bò quaù nhieät. Doøng ñieän ra quaù taûi. Doøng ñieän ra ngaén maïch, pha vaø pha hay pha vaø ñaát. Ñaàu ra heä thoáng noái ñaát bò loãi. Baûo veä quaù nhieät motô. Motô bò maát pha. ÔÛ nhöõng khu vöïc nhieàu motô noái tôùi 1 boä ñieàu khieån chính, cung caáp ñaày ñuû boä baùo loãi vaø baûo veä quaù taûi cho töøng motô rieâng leû Hieån thò khi bus DC ñang ñöôïc saïc vaø moät maïch an toaøn cung caáp nguoàn töø bus naøy khi nguoàn bò maát.

Laép ñaët Vò trí: Laép ñaët boä ñieàu khieån trong phaïm vi 15m töø motô ñeán tuû ñieän. Khoâng vöôït quaù khoaûng caùch toái ña cuûa nhaø saûn xuaát qui ñònh. Laép ñaët töøng boä ñoäc laäp.




Daây caùp: - Cung caáp caùp vaø hoäp ñaáu noái theo nhöõng khuyeán caùo chung cuûa nhaø

saûn xuaát boä ñieàu khieån. - Toái öu khoaûng caùch töø motô ñeán boä daãn ñoäng - Laép ñaët taát caû caùp ñeán vaø ñi töø töø boä ñieàu khieån toác ñoä moät caùch rieâng

reõ vaø trong caùc maùng caùp rieâng reõ töø heä ñieän khaùc, daây ñieàu khieån vaø day thoâng tin, giao ngang caùc caùp khaùc vôùi moät goùc hôïp lyù.

- Cung caáp caùp ñieän 3 loõi noái giöõa boä ñieàu khieån vaø motô vaø noái ñaát baûo veä taïi caû 2 ñaàu cuoái.

- Noái ñaát cho boä ñieàu khieån tröïc tieáp ñeán heä thoáng tieáp ñaát cuûa toøa nhaø. - Noái ñaát cuûa motô noái tröïc tieáp ñeán boä chuyeån ñoåi vaø khoâng noái tröïc tieáp

ñeán tuû ñieän ñeå traùnh doøng noái ñaát ñi voøng caàu dao. Caàu dao - Ñoái vôùi heä daãn ñoäng coâng suaát >=55 kW cung caáp caàu dao taïi motô noái

ñeán caàu dao caùch ly ñaët taïi tuû ñieän. - Ñoái vôùi heä daãn ñoäng coâng suaát <55 kW cung caáp caàu dao ñieän taïi motô.

Nghieäm thu Caùc soùng haøi: Kieåm tra caùc nguoàn soùng haøi taïi ñieåm ñaáu noái chung (PCC) vaø taïi ñieåm vaøo cuûa boä chænh löu cho soùng haøi töø baäc 3 ñeán baäc 19 trong ñieàu kieän ñaày taûi nhö ñaõ moâ taû. Ñeä trình caùc keát quaû.

5.8 PHIN LOÏC GIOÙ (AIR FILTERS) (a) Toång quaùt

Toaøn boä phin loïc gioù phaûi coù hieäu suaát nhö ñöôïc qui ñònh trong “Baûng hieäu suaát” cuûa Quy phaïm Kyõ thuaät naøy vaø ñöôïc laép ñaët nhö moâ taû treân baûn veõ. Khi hoaøn thaønh coâng taùc thöû nghieäm caùc boä caáp gioù vaø tröôùc khi baøn giao heä thoáng caáp gioù cho chuû ñaàu tö, phaûi thay theá toaøn boä vaät lieäu loïc gioù cuõ baèng vaät lieäu loïc gioù môùi vaø saïch. Toaøn boä oáng loïc gioù trong boä loïc phaûi ñöôïc ñaùnh soá/ daùn nhaõn.

(b) Loïc gioù hieäu suaát trung bình Cung caáp loïc gioù hieäu suaát trung bình cho FCU vaø heä thoáng thoâng gioù. Coâng suaát löu löôïng gioù toái thieåu cuûa oáng loïc gioù phaûi coù khaû naêng ñaùp öùng coâng suaát döï truø trong thôøi gian toái thieåu 10% vaø döï phoøng phaàn roø ræ oáng gioù (5%). OÁng loïc gioù phaûi laø loaïi taám saâu, daøy 100mm duøng cho heä thoáng ñieàu hoaø khoâng khí vaø heä thoáng thoâng gioù vôùi hieäu suaát loïc 20%, 98%, 85%, 88% töông öùng vôùi nhöõng laàn thöû nghieäm buïi 1, 2, 3 vaø 4 vôùi löôïng buïi 600 gram/ m2 dieän tích beà maët khi thöû nghieäm laàn thöù 4 (thöû nghieäm NATA) vôùi trôû löïc sau cuøng laø 125Pa, cao hôn trôû löïc ban ñaàu

(c) Phin loïc gioù daïng tuùi Phin loïc gioù phaûi laø loaïi khoâ, vaät lieäu loùt saâu. Phin loïc phaûi ñöôïc ñaët trong khung cöùng trong hoäp troän. Ñoaïn oáng gioù chöùa phin loïc gioù phaûi ñöôïc cung caáp cöûa baûo trì töông xöùng ñeå deã daøng thay theá phuï kieän oáng loïc. Phin loïc gioù phaûi tuaân theo nhöõng yeâu caàu sau: ● Toaøn boä phin loïc gioù phaûi gioáng nhau




● Khung chöùa phin loïc phaûi ñöôïc laøm baèng theùp meàm, ñoä daøy khoâng nhoû hôn 1.6mm, ñöôïc maï keõm hoaëc xöû lyù baèng chaát choáng aên moøn ñöôïc chaáp thuaän

● Ngoaøi ra, coù theå söû duïng taám nhoâm coù ñoä daøy lôùn hôn 2mm. Trong tröôøng hôïp ñoù, khoâng caàn phaûi aùp duïng bieän phaùp choáng aên moøn. Moãi khung giöõ phaûi ñöôïc ñuïc loã saün ñeå nhöõng moái gheùp coù theå ñi vaøo oáng loïc gioù hoaëc cheøn vaøo oáng gioù

● Nieâm kín giöõa maøng loïc, khung, khung loïc vaø voû thieát bò phaûi ñöôïc thöïc hieän sao cho khoâng khí khoâng ñi taét qua phin loïc. Neáu khung loïc phaûi ñöôïc haøn vaøo vôùi nhau, chaát nieâm kín ñöôïc chaáp thuaän phaûi ñöôïc cung caáp. Khung loïc phaûi coù cöôøng ñoä vaø ñoä cöùng töông xöùng ñeå choáng laïi söï bieán daïng hoaëc uoán theo chieàu truïc trong baât kyø daïng thöùc saép xeáp caùc oâ loïc

● Phin loïc gioù phaûi ñöôïc giöõ giöõ chaéc vaøo khung baèng keïp taùc ñoäng nhanh sao cho coù theå deã daøng thaùo rôøi oâng loïc gioù ñeå röûa vaø/ hoaëc thay theá

● Phin loïc gioù phaûi ñöôïc thöû nghieäm ñaëc tính trong traïng thaùi vaän haønh. Keát quaû thöû nghieäm seõ ñöôïc ñeä trình Tö vaán

(d) Ñoàng hoà ño cheânh leäch aùp suaát Cung caáp cho moãi boä loïc gioù 1 ñoàng hoà ño cheânh leäch aùp suaát ñeå hieån thò ñoä suït aùp. Moãi ñoàng hoà coù khaû naêng boá trí giaù trò 0. Gaén nhaõn “Phin loïc gioù saïch” vaø “Phin loïc gioù dô” vaøo ñoàng hoà baèng caùch khoan loã treân ñoàng hoà theo ñeà xuaát cuûa nhaø saûn xuaát veà veà saïch vaø dô. Ñoàng hoà ño cheânh leäch aùp suaát ñöôïc gaén treân hoäp gioù hoài cuûa thieát bò ÑHKK.




5.9 QUAÏT HÖÔÙNG TRUÏC (AXIAL FLOW FANS) (a) Toång quaùt

Cung caáp vaø laép ñaët quaït höôùng truïc nhö ñöôïc qui ñònh trong baûn veõ ñöôïc lieät keâ ôû phaàn sau cuûa Quy phaïm Kyõ thuaät naøy. Quaït phaûi coù ñaëc tính taûi giôùi haïn. Neáu quaït ñöôïc laép vaøo thieát bò nguyeân boä (proprietary line equipment), coù theå chaáp thuaän tieâu chuaån cuûa nhaø saûn xuaát. Nhaø thaàu phaûi neâu roõ nhöõng haïng muïc ñöôïc cung caáp khaùc vôùi Quy phaïm Kyõ thuaät nhö theá naøo. Vieäc thöû nghieäm quaït ñöôïc xem laø moät phaàn trong coâng taùc thöû nghieäm toaøn boä heä thoáng. Khung oå truïc ñaøn hoài seõ ñöôïc söû duïng neáu coù saün vaø phuø hôïp. Caùnh quaït laø loaïi caùnh quaït chong choùng, ñöôïc cheá taïo töø chaát deûo gia coá sôïi thuûy tinh hoaëc nhoâm. Caùnh quaït coù theå ñieàu chænh ñöôïc taïi goùc cuïc boä vaø ñöôïc gaén vaøo truïc quaït. Baèng caùch ñieàu chænh goùc cuïc boä vaø khoâng thay ñoåi moâ tô, quaït coù theå phaân phoái löu löôïng ñöôïc qui ñònh vôùi trôû löïc heä thoáng toái thieåu töø döôùi 10% ñeán treân 10% theo ñaùnh giaù cuûa nhaø thaàu.

(b) Vaät lieäu Bao goàm caùc loaïi vaät lieäu sau:

Vò trí quaït Truïc Voû quaït

Ngoaøi trôøi Theùp khoâng gæ Theùp meàm

Vò trí khaùc Theùp chòu löïc Theùp meàm

Vaät lieäu phaûi tuaân thuû nhöõng tieâu chuaån sau

Theùp taám meàm Theùp taám khoâng gæ theo tieâu chuaån AS3678 & AS3679

Tieâu chuaån BSS 970-EN58A hoaëc EN58B (Equiv. Comsteel 302, 321)

Truïc theùp chòu löïc Tieâu chuaån AS-97 S1040 hoaëc BSS 970-EN8

Truïc theùp khoâng gæ BSS 970-EN57 EN58B (Equiv. Comsteel 431)

(c) Voû quaït Voû quaït ñöôïc laøm töø loaïi vaät lieäu coù cöôøng ñoä cao vaø coù chieàu daøi toái thieåu baèng chieàu daøi quaït/ moâ tô. Voû quaït phaûi phuø hôïp vôùi maët bích ôû hai ñaàu vaø maët bích khoan. Cung caáp hoäp ñaáu daây vaø cöûa soå baûo trì cho nhöõng boä phaän di ñoäng taïi nhöõng vò trí coù theå tieáp caän treân hoäp.

(d) Truïc Truïc daãn ñoäng ñöôïc thieát keá sao cho toác ñoä nguy hieåm ñaàu tieân cuûa truïc toái thieåu phaûi ñaït 130% toác ñoä hoaït ñoäng bình thöôøng cuûa quaït.

(e) OÅ truïc Toaøn boä oå truïc laø bi hoaëc ñuõa töï ñieàu chænh ñoàng truïc ñeå baûo ñaûm tuoåi thoï theo yeâu caàu laø 300,000 giờ. Thieát laäp dung sai sao cho khoâng vöôït quaù ñoä oàn qui ñònh. Neáu ñöôøng thoâng hôi lôùn hôn 30mm, goái ñôõ truïc phaûi ñöôïc giöõ




baèng oå truïc bi. Trong nhöõng tröôøng hôïp khaùc, coù theå söû duïng oå bi raõnh saâu. Toaøn boä hoäp voû truïc phaûi ñöôïc choát vaø daùn nhaõn nhaän dieän. OÅ truïc phaûi ñöôïc daùn nhaõn loaïi felt hoaëc “Gaco” vaø döï phoøng aùp löïc xaû môõ quaù taûi. Toaøn boä oå truïc phaûi coù nuùt môõ gaén taïi vò trí deã tieáp caän treân voû oå truïc.

(f) Daãn ñoäng daây ñai (taïi vò trí ñöôïc qui ñònh) Daãn ñoäng daây ñai phaûi phuø hôïp vôùi ñai V, toái thieåu 2 daây ñai moãi baùnh ñai. Cung caáp phöông tieän ñöôïc chaáp thuaän ñeå deã daøng ñieàu chænh. Cung caáp vaø gaén khung che daây ñai vaø baùnh ñai coù theå thaùo rôøi ñöôïc deã daøng. Coâng suaát ñieän cuûa daãn ñoäng phaûi lôùn hôn 30% coâng suaát ñieän cuûa moâ tô. Caån thaän ñieàu chænh daãn ñoäng ñeå haïn cheá ñoä oàn. Khung che cöùng phaûi ñöôïc gaén aâm hoaøn toaøn vaøo beân trong vaø beân ngoaøi voû. Boá trí sao cho coù theå deã daøng thay theá daây ñai.

(g) Caân baèng Toaøn boä caùc chi tieát chuyeån ñoäng phaûi hoaøn toaøn caân baèng tónh vaø ñoäng.

(h) Caùch ly rung ñoäng Moái gheùp quaït/ moâtô phaûi ñöôïc gaén treân khung neoprene keát hôïp loø xo/ ribbed taïi vò trí sao cho voõng ñeàu xuoáng. Ñöôøng kính coil trung bình cuûa loø xo khoâng döôùi 80% chieàu daøi loø xo taûi. Loø xo phaûi coù ñoä neùn tónh baèng 150% ñoä neùn tónh qui ñònh. Khung phaûi ñöôïc cung caáp truïc vít caân baèng baét ñai oác khoaù. Ñoä neùn tónh phaûi ñöôïc thieát laäp nhö sau:

Rev/sec Saøn ñaát cöùng Saøn treo daøi ñeán 9m

Saøn treo daøi 9m hoaëc hôn

Treân 8 9.0 25.0 45.0

6 ñeán 8 9.0 63.0 63.0

5 ñeán 6 9.0 63.0 70.0

Cung caáp khoái quaùn tính neáu caàn. Neáu quaït ñöôïc gaén vaøo truïc theo phöông ngang vaø taïi vò trí caàn thieát nhaèm ngaên chaën söï di chuyeån truïc töø ñaàu noái meàm oáng gioù giaõn hoaëc neùn, goái ñôõ phaûi ñöôïc giöõ coá ñònh baèng khung loø xo vaøo khung saét goùc. Nhöõng khung naøy phaûi töông ñöông Mason SLF vôùi cheùn caùch aâm. Ñoä bieán daïng toái thieåu khi trôû löïc heä thoáng vaän haønh heát coâng suaát khoâng vöôït quaù 50mm. Ñaàu noái oáng gioù meàm phaûi ñöôïc saép ñaët cho phuø hôïp vôùi voøng giöõ kim loaïi beân trong ñaàu thu oáng meàm, nhaèm ngaên chaën oáng meàm bò huùt vaøo oáng gioù. (i) Moâ tô

Toác ñoä moâ tô khoâng ñöôïc vöôït quaù 25 voøng/ giaây Coâng suaát cuûa moâ tô phaûi treân 100% coâng suaát qui ñònh.

(ii) Ñaáu noái Ñaáu noái oáng gioù baèng ñaàu noái meàm laøm baèng vaûi phuû PVC, khoái löôïng khoâng nheï hôn 570 gr/m2 , chieàu daøi khoâng nhoû hôn 70mm

(iii) Vaän chuyeån Trong quaù trình vaän chuyeån, caùnh coâng taùc phaûi ñöôïc giöõ thích hôïp nhaèm ngaên chaën leäch bi vaø/ hoaëc oå ñôõ.




(iv) Choáng aên moøn

Beà maët quaït phaûi ñöôïc xöû lyù nhö qui ñònh döôùi ñaây:

Haïng muïc Vò trí Nhöõng vò trí khaùc ngoaøi trôøi

Beân trong hoäp MS Phöông phaùp A Phöông phaùp B

Beân ngoaøi hoäp MS Phöông phaùp D Phöông phaùp C

Nhöõng phaàn MS khaùc Phöông phaùp D Phöông phaùp C

Truïc - Troáng

Nhöõng phöông phaùp chuû yeáu:

Phöông phaùp A Keõm nhuùng noùng neáu khoâng quaù lôùn. Ngoaøi ra, phu nhoâm noùng chaûy vôùi ñoä daøy 0.10mm, sau ñoù phuû 1 lôùp men epoxy

Phöông phaùp B Phun nhoâm noùng chaûy vôùi ñoä daøy 0.10mm, sau ñoù phuû 1 lôùp men epoxy

Phöông phaùp C Lau saïch, chaâm sôn keõm. Ñoå 1 lôùp loùt vaø lôùp ngoaøi baèng men boùng ñöôïc chaáp thuaän

Phöông phaùp D Keõm nhuùng noùng neáu khoâng quaù lôùn. Ngoaøi ra, phun nhoâm noùng chaûy vôùi ñoä daøy 0.10mm, sau ñoù ñoå 1 lôùp loùt vaø lôùp ngoaøi baèng men boùng ñöôïc chaáp thuaän




5.10 QUAÏT LY TAÂM (CENTRIFUGAL FANS) Quaït ly taâm phaûi tuaân thuû nhöõng tieâu chuaån coù lieân quan. Nhöõng tieâu chuaån sau vaø danh muïc coâng suaát ñöôïc ñeà caäp trong Quy phaïm Kyõ thuaät naøy.

● Chuûng loaïi: Quaït ly taâm SISW ● Vaät lieäu: Theùp, saûn xuaát theo tieâu chuaån

Quaït/ moâtô phaûi ñöôïc gaén treân ñeá theùp, vöøa vôùi khung loø xo choáng rung. Voû quaït phaûi ñöôïc laøm chaéc chaén vaø ñöôïc cung caáp:

● Meùp bích ñaàu vaøo vaø ñaàu ra ● Cöûa soå baûo trì kín gioù ● Maët coân ñaàu vaøo quaán xung quanh cho khoâng khí ñi vaøo deã daøng ● Khung che ôû ñaàu huùt

Voû, oå truïc vaø truï moâtô phaûi cöùng vaø khoâng bò oaèn. Ñöôøng thoâng hôi quaït ñöôïc thieát keá sao cho toác ñoä nguy hieåm ñaàu tieân cuûa ñöôøng thoâng hôi ít nhaát phaûi ñaït 130% toác ñoä vaän haønh cuûa quaït. Ñöôøng thoâng hôi quaït phaûi vöøa vôùi oå ñôõ ñuõa vaø bi töï ñieàu chænh ñoàng truïc, ñöôïc thieát keá cho chu kyø söû duïng 100,000 giờ. OÅ truïc laø loaïi nieâm kín. Daãn ñoäng daây ñai goàm ít nhaát 2 ñai theo tieâu chuaån cuûa nhaø saûn xuaát nhaèm ñaûm baûo tuoåi thoï daây ñai. Moãi moâtô quaït vaø boä khôûi ñoäng moâtô phaûi tuaân theo yeâu caàu ñeà caäp trong khoaûn « Moâtô ñieän » trong Quy phaïm Kyõ thuaät naøy. Naêng löôïng ñieän cuûa moãi moâtô khoâng ñöôïc nhoû hôn toång yeâu caàu ñieän cuûa quaït (döïa treân coâng suaát toái ña vaän haønh lieân tuïc vôùi toác ñoä qui ñònh) vaø ñieän naêng thaát thoaùt. Toaøn boä coâng ñoaïn laép raùp caùc chi tieát xoay cuûa quaït phaûi ñöôïc caân baèng tónh vaø ñoäng. Cung caáp khung choáng rung ñeå laép raùp ñoäng cô quaït. Thieát bò quaït phaûi ñöôïc choáng aên moøn theo yeâu caàu qui ñònh trong khoaûn « sôn vaø choáng aên moøn » trong Quy phaïm Kyõ thuaät naøy.

5.11 QUAÏT LY TAÂM IN-LINE (CENTRIFUGAL FANS IN-LINE) Veà cô baûn, quaït ly taâm in-line phaûi bao goàm caùnh coâng taùc ly taâm daãn ñoäng tröïc tieáp vaø ñoäng cô ñieän ñöôïc gaén trong hoäp chòu löïc. Quaït ñöôïc gaén oáng gioù hoaëc gaén töôøng theo qui ñònh. Quaït gaén töôøng phaûi coù laù saùch khoâng hoài. Vieäc laép raùp caùnh coâng taùc vaø moâtô phaûi ñöôïc caân baèng tónh vaø ñoäng.

5.12 QUAÏT GAÉN TÖÔØNG HOAËC TRAÀN (PROPELLER FANS - WALL OR CEILING MOUNTED) Quaït caùnh kieåu chong choùng toái thieåu phaûi coù 1 caùnh kieåu chong choùng daãn ñoäng tröïc tieáp gaén trong hoäp chòu löïc. Quaït phaûi coù van gioù môû veà phía sau (backdraught dampers) taïi vò trí qui ñònh. Coâng taùc laép raùp caùnh coâng taùc vaø moâtô phaûi caân baèng tónh vaø ñoäng.




5.13 QUAÏT HUÙT GAÉN TREÂN MAÙI (ROOF MOUNTED FAN) Quaït phaûi laø loaïi thaûi gioù theo chieàu thaúng ñöùng coù hoäp sôïi thuûy tinh ñuùc khuoân huùt tieáng oàn vaø chòu ñöôïc va chaïm. Truï ñôõ (Base supports) vaø toaøn boä keïp phaûi laøm baèng theùp khoâng gæ. Maøu voû quaït phaûi phuø hôïp vôùi maøu taám traàn keá beân. Caùnh coâng taùc laø loaïi nghieâng veà phía sau, coù ñaëc tính khoâng taûi. Moâtô phaûi ñöôïc gaén ngoaøi luoàng gioù (air stream) vaø laø loaïi hoaøn toaøn kín. Quaït laø loaïi daãn ñoäng daây ñai hoaëc daãn ñoäng tröïc tieáp nhö ñöôïc qui ñònh trong Baûng tieâu chuaån vaän haønh vaø ñöôïc caáp khung choáng rung phuø hôïp. Quaït gaén treân maùi phaûi ñöôïc gaén treân nhöõng leà ñöôïc cung caáp vaø ñaët khuoân döôùi bôûi Nhaø thaàu chính. Tuy nhieân, nhaø thaàu phuï phaûi chòu traùch nhieäm baûo ñaûm taám chaén truï ñôõ quaït cung caáp baûo veä khuoân treân ñeå loaïi tröø söï thaám nöôùc. Quaït vaän haønh trong cheá ñoä xaû khoùi phaûi tuaân theo tieâu chuaån AS1668.

5.14 BÌNH GIAÕN NÔÛ LOAÏI KÍN Cung caáp vaø laép ñaët bình giaõn nôû loaïi hôû cho heä thoáng nöôùc laïnh nhö qui ñònh treân baûn veõ. Bình phaûi coù kích thöôùc töông xöùng. Bình phaûi coù van caùch ly, ñeå laøm veä sinh.




6. OÁNG GIOÙ VAØ PHUÏ KIEÄN (DUCTWORK & FITTINGS)

6.1 TOÅNG QUAÙT Phaàn naøy moâ taû nhöõng yeâu caàu chung cho oáng gioù, phuï kieän oáng gioù vaø caùc thieát bò phuï trôï kieåm soaùt gioù, tröø phi nhöõng yeâu caàu chung bò huûy boû bôûi nhöõng yeâu caàu cuï theå trong Quy phaïm Kyõ thuaät hoaëc treân baûn veõ. Nhaø thaàu phuï phaûi cung caáp vaø laép ñaët toaøn boä oáng gioù vaø phuï kieän sao cho heä thoáng gioù vaän haønh chính xaùc vaø ñaùp öùng yeâu caàu qui ñònh trong Quy phaïm Kyõ thuaät naøy. Toaøn boä oáng gioù vaø phuï kieän ñöôïc vaän chuyeån ñeán coâng tröôøng phaûi môùi, ñöôïc daùn nhaõn roõ raøng baèng möïc khoâng taåy xoaù ñöôïc nhaèm phaân bieät loaïi, vaät lieäu vaø nhaø saûn xuaát. Toaøn boä mieäng gioù caáp, hoài, gioù töôi vaø gioù thaûi phaûi laø loaïi ñöôïc qui ñònh treân baûn veõ. Toaøn boä oáng gioù, phuï kieän, moái noái vaø vaät lieäu noái phaûi phuø hôïp vaø khoâng bò bieán daïng do söï thay ñoåi thôøi tieát. Toaøn boä oáng gioù vaø caùc vaät lieäu nhö oáng loùt, keo daùn, oáng gioù meàm, ñaàu noái meàm, ñeäm loùt, chaát traùm beà maët, taám thuûy tinh, v.v. phaûi hoaøn toaøn tuaân theo yeâu caàu FSD veà trôû löïc cho söï xaâm nhaäp vaø lan roäng löûa vaø khoùi. Vaät lieäu, coâng taùc thi coâng vaø laép ñaët toaøn boä oáng gioù baèng toân vaø phuï kieän phaûi tuaân theo Quy phaïm Kyõ thuaät veà oáng gioù baèng toân, tieâu chuaån DW/142 (MVAC). Neáu coù baát kyø phaàn coâng taùc laép ñaët khoâng ñöôïc qui ñònh trong Quy phaïm Kyõ thuaät MVAC, phieân baûn môùi nhaát tieâu chuaån cuûa caùc nhaø thaàu toân vaø ñieàu hoøa khoâng khí thuoäc Hieäp hoäi quoác gia cuûa Hoa Kyø (Sheet Metal and Air Conditioning Contractor's National Association - SMACNA) seõ ñöôïc aùp duïng cho caû heä thoáng toác ñoä cao vaø heä thoáng toác ñoä thaáp. Neáu baát kyø phaàn coâng taùc laép ñaët neâu treân baûn veõ khoâng ñöôïc qui ñònh trong tieâu chuaån MVAC hoaëc SMACNA, phaûi ñeä trình tö vaán pheâ duyeät veà vaät lieäu vaø phöông phaùp tröôùc khi laép ñaët. Khi laép ñaët oáng gioù, phaûi thöïc hieän kieåm tra roø ræ oáng gioù theo tieâu chuaån DW/143:1983 (MVAC). Toaøn boä hoà sô kieåm tra phaûi ñeä trình cho tö vaán pheâ duyeät. Neát tæ leä roø ræ vöôït quaù tæ leä qui ñònh theo tieâu chuaån DW/142, phaàn oáng gioù naøy seõ ñöôïc thaùo rôøi, lau saïch moái noái, laép raùp vaø kieåm tra laïi. Baûn veõ chæ theå hieän kích thöôùc trong vaø caùch thöùc heä thoáng oáng gioù seõ ñöôïc laép ñaët. Nhaø thaàu phaûi döï phoøng ñoä daøy caùch nhieät beân trong vaø beân ngoaøi khi ño kích thöôùc oáng gioù vaø löïa choïn thieát bò vaø phuï kieän. Nhaø thaàu phuï phoái hôïp vôùi caùc nhaø thaàu khaùc trong coâng taùc laép ñaët oáng gioù chòu traùch nhieäm tìm hieåu roõ raøng coâng vieäc thöïc teá coù lieân quan veà söï thay ñoåi cao ñoä, v.v. Nhaø thaàu phuï phaûi döï phoøng hôïp lyù ñeå sau naøy di dôøi vaø thaùo dôõ caùc phaàn cuûa oáng gioù baèng buloâng, moái noái maët bích vaø trong moïi tröôøng hôïp phaûi ñöôïc tö vaán pheâ duyeät tröôùc khi thöïc hieän.




6.2 VAÄT LIEÄU OÁNG GIOÙ BAÈNG TOÂN Thoâng thöôøng, toaøn boä oáng gioù phaûi laøm baèng theùp maï keõm nhuùng noùng theo tieâu chuaån BS 2989:1975, Loaïi Z2, loaïi voû 'C' theo nhö qui ñònh trong DW/142. OÁng gioù baèng theùp maï keõm phaûi ñöôïc laøm töø nhöõng taám theùp phaúng maï keõm, ñuû kích thöôùc, chaát löôïng toát nhaát vaø hoaøn toaøn môùi. Loaïi aùp suaát vaø giôùi haïn roø ræ khoâng khí phaûi tuaân theo qui ñònh trong tieâu chuaån DW/142. Yeâu caàu aùp suaát cho heä thoáng oáng gioù phaûi tuaân theo qui ñònh treân baûn veõ.

6.3 OÁNG GIOÙ MEÀM Toaøn boä oáng gioù meàm vaø phuï kieän duøng caùch nhieät vaø khoâng caùch nhieät phaûi ñöôïc nhaäp khaåu. Ñoái vôùi oáng gioù caùch nhieät, lôùp caùch nhieät phaûi laø loaïi ñöôïc caùch nhieät taïi nhaø maùy, choáng hôi aåm, ñoä daøy 25mm, maät ñoä 24 kg/m3 vaø ñöôïc quaán baèng laù nhoâm. OÁng gioù meàm phaûi tuaân theo yeâu caàu cuûa tieâu chuaån DW/142, BS476 Phaàn 6 hoaëc UL181 Loaïi 2 vaø phaûi laø loaïi ñöôïc Sôû Caûnh saùt PCCC chaáp thuaän. Toaøn boä oáng gioù meàm phaûi laø loaïi ñöôïc caét theo hình xoaén oác, laù nhoâm caùch nhieät saün, ñöôïc laøm töø maøng nhoâm nhieàu laù, cöùng, ñöôïc giöõ baèng ñöôøng ñinh oác baèng theùp döï öùng löïc, phuø hôïp vôùi nhieät ñoä vaän haønh trong khoaûng -5oC ñeán 90oC theo pheâ duyeät cuûa Tö vaán vaø phaûi phuø hôïp vôùi cöôøng ñoä vaø aùp suaát qui ñònh cho heä thoáng ñaëc bieät. OÁng gioù kim loaïi meàm phaûi ñöôïc laép ñaët taïi vò trí qui ñònh treân baûn veõ vaø/ hoaëc taïi vò trí khaùc caàn thieát ñeå loaïi tröø söï truyeàn rung ñoäng. Toaøn boä co (bend) trong heä thoáng oáng gioù meàm phaûi ñöôïc taïo thaønh theo ñeà xuaát cuûa nhaø saûn xuaát. Ñöôøng kính taâm cuûa co trong nhoû hôn 1.5 laàn ñöôøng kính oáng gioù. Co phaûi duy trì 1 ñöôøng kính ñeàu nhau suoát chieàu daøi co. Co bò bieán daïng hoaëc hö hoûng vì baát cöù lyù do gì trong khi laép ñaët phaûi ñöôïc thay theá baèng co môùi. Toaøn boä phuï kieän nhö teâ, loïc Y, coân phaûi laøm baèng toân maï keõm nhö ñöôïc qui ñònh cho oáng gioù baèng toân hình troøn. Toaøn boä moái noái trong oáng gioù phaûi ñöôïc caáp ñaàu noái ngaén laøm töø oáng gioù troøn toân maï keõm ñeå taïo thaønh moái noái choaøng vaøo. Hôn nöõa, toaøn boä ñaáu noái vaøo phuï kieän vaø hoäp ñaáu daây, v.v. phaûi laø loaïi moái noái choaøng coù ñaàu noái. Toaøn boä moái noái phaûi ñöôïc nieâm kín baèng neïp oáng loaïi co ngoùt gioáng nhö "Thermofit" hoaëc loaïi töông ñöông, ngoaïi tröø neïp caøi kim loaïi, loaïi baét oác hoaëc loaïi töông töï theo pheâ duyeät cuûa tö vaán coù theå chæ ñöôïc duøng cho öùng duïng aùp suaát thaáp. Khoâng söû duïng ñinh oác kim loaïi töï ren vaø ñinh taùn. Toaøn boä oáng gioù meàm phaûi ñöôïc giöõ baèng daây treo taïi vò trí caùch nhau toái thieåu 2000mm ñeå ngaên chaën söï voõng quùa möùc vaø tuaân theo ñeà xuaát cuûa nhaø saûn xuaát. OÁng gioù meàm khoâng bao giôø ñöôïc döïa treân taám traàn hoaëc heä thoáng treo. Toaøn boä oáng gioù meàm phaûi ñöôïc kieåm tra möùc ñoä kín gioù vaø möùc ñoä roø ræ khoâng khí theo yeâu caàu cuûa Quy phaïm Kyõ thuaät naøy. Chieàu daøi oáng gioù meàm khoâng ñöôïc vöôït quaù 3m.




6.4 PHUÏ KIEÄN (a) Moái noái vaø phuï kieän

Toaøn boä moái noái giao, moái noái theo chieàu doïc, co vaø caùc thieát bò khaùc phaûi tuaân theo tieâu chuaån DW/142:1982. Toaøn boä maët bích vaø caùc haïng muïc theùp cuûa caùc phuï kieän noái vaø giaù ñôõ phaûi ñöôïc maï keõm nhuùng noùng theo tieâu chuaån BS729:1971, Phaàn 1 hoaëc BS2989. Toaøn boä moái noái vaø oáng gioù hình ovan phaúng duøng cho caùc tröôøng hôïp aùp suaát trung bình vaø aùp suaát cao phaûi ñöôïc daùn nhaõn oáng gioù loaïi co ngoùt gioáng nhö ‘Thermofit’ hoaëc loaïi töông töï ñöôïc chaáp thuaän.

(b) Chaát traùm beà maët khe oáng gioù Noái caùc moái noái giao maët bích phaûi ñöôïc laøm töø ñeäm baèng chì 'Prestick' hoaëc vaät lieäu khaùc ñöôïc chaáp thuaän vôùi ñoä daøy khoâng nhoû hôn 4mm. Chaát traùm duøng cho moái noái theo chieàu doïc vaø moái noái choaøng vaøo phaûi laø loaïi hôïp chaát traùm EC/750C.

(c) Van gioù vaø caùnh chuyeån höôùng Van gioù vaø caùnh chuyeån höôùng phaûi ñöôïc caáp beân trong oáng gioù taïi vò trí qui ñònh. Ñaëc bieät, van gioù vaø caùnh chuyeån höôùng phaûi ñöôïc cung caáp taïi taát caû nhöõng co coù baùn kính beân trong nhoû hôn chieàu roäng cuûa oáng gioù vaø taïi vò trí goùc lôùn hôn 30o taïi ñoaïn giao. Van gioù vaø caùnh chuyeån höôùng phaûi laø daïng khí ñoäng hoïc, ví duï loaïi van hai laù ñeå baûo ñaûm ñoåi haún höôùng gioù taïi ñieåm giao vôùi phaàn laùi, ñöôøng kính vaø khoaûng caùch ñöôïc choïn loïc ñeå ñaït ñöôïc toác ñoä ñoàng nhaát taïi co.

(d) Noái meàm Cung caáp noái meàm taïi caùc moái noái huùt vaø xaû cuûa taát caû quaït vaø AHU vaø taïi vò trí ñöôïc qui ñònh treân baûn veõ hoaëc theo qui ñònh ñeå loaïi tröø rung ñoäng. Toaøn boä noái meàm söû duïng taïi nhieät ñoä toái ña laø 90oC phaûi laøm töø sôïi thuûy tinh phuû neoprene coù maät ñoä khoâng döôùi 1 Kg/m2. Toaøn boä noái meàm söû duïng taïi nhieät ñoä lôùn hôn 90oC vaø trong öùng duïng huùt khoùi phaûi laø sôïi deät choáng chaùy, coù khaû naêng chòu ñöôïc nhieät ñoä 250oC trong ñieàu kieän vaän haønh lieân tuïc. Toaøn boä noái meàm ngoaøi trôøi phaûi ñöôïc phuû theùp maï keõm hoaëc maøn che sôïi thuûy tinh ñöôïc saép xeáp ñeå taïo thaønh boïc chòu ñöôïc möa gioù hoaøn haûo. Toaøn boä noái meàm phaûi ñöôïc gaén treân maët bích goùc theùp meàm taïi hai ñaàu vaø gaén chaët vôùi daûi theùp goùc meàm vôùi ñoä daøy khoâng nhoû hôn 2.5mm vaø ñoä roäng khoâng nhoû hôn 25mm. Ñaàu noái meàm oáng gioù troøn phaûi laø loaïi hình baùn khuyeân chia nhaùnh keùo saùt vaøo buloâng taïi ñieåm chia nhaùnh. Thanh caùi phaúng duøng cho oáng gioù hình chöõ nhaät phaûi ñöôïc gaén coá ñònh baèng buloâng hoaëc vít taïi vò trí caùch nhau khoâng lôùn hôn 150mm. Maët bích duøng ñaáu noái khoâng ñöôïc nhoû hôn ñoä daøi qui ñònh cho oáng gioù vaø khoaûng caùch “töï do” giöõa caùc maët bích khoâng ñöôïc nhoû hôn 50mm. Noái meàm ñöôïc laép ñaët vôùi ñoä chuøng khoâng nhoû hôn 25mm giöõa maët bích nhaèm ngaên chaën söï truyeàn rung ñoäng. Noái meàm khoâng ñöôïc duøng ñeå ñieàu chænh söï leäch cuûa quaït vaø oáng gioù.




Taïi vò trí noái meàm ñöôïc duøng ñeå ñaáu noái quaït vaøo oáng gioù caùch nhieät, sôïi thuûy tinh meàm coù ñoä daøy töông ñöông ñoä daøy sôïi thuûy tinh duøng trong caùch nhieät oáng gioù phaûi ñöôïc phuû treân vaûi vaø gaén aâm vaøo lôùp ngaên aåm maøng nhoâm Sisalation 450. Taïi vò trí thieát bò giaûm aâm ñöôïc gaén vaøo quaït taïi maët huùt hoaëc xaû, noái meàm baèng nhöïa nhieãm chì hoaëc loaïi vaät lieäu khaùc phuø hôïp seõ cung caáp lôùp ngaên aâm.

(e) Cöûa soå baûo trì Cung caáp cöûa soå baûo trì taïi nhöõng vò trí sau ñeå veä sinh oáng gioù ● Trong khoaûng 600mm cuûa moãi cuùt ● Cuoái moãi oáng gioù ● Cöù moãi 15m oáng gioù thaúng khi khoâng coù löôùi gioù

Cung caáp cöûa soå baûo trì taïi moãi ñieåm trong heä thoáng oáng gioù ñeå kieåm tra, baûo trì, veä sinh caùc thieát bò. Caùc thieát bò bao goàm van choáng chaùy, hoäp gioù, van gioù ñieàu chænh baèng moâtô, buoàng quaït, buoàng gioù, v.v. Nhaø thaàu phuï phaûi cung caáp theâm cöûa soå baûo trì ñeå kieåm tra, baûo trì vaø veä sinh thieát bò khoâng ñöôïc ñeà caäp treân ñaây. Nhaø thaàu phuï phaûi cung caáp vaø laép ñaët cöûa soå baûo trì trong oáng gioù, voû, vaùch ngaên baèng toân caáu truùc keùp G.I. vôùi lôùp caùch nhieät coù ñaëc tính töông töï ñoaïn oáng gioù keá caän, khoâng nhoû hôn lôùp toân daøy 0.8 mm, coù ñeäm bao quanh toaøn boä chu vi ñeå baûo ñaûm lôùp nieâm kín tuaân theo tieâu chuaån veà roø ræ DW/142 theo qui ñònh. Kích thöôùc toái thieåu phaûi laø 450 mm x 450 mm hoaëc heïp hôn oáng gioù 50 mm, baát kyø thoâng soá naøo nhoû hôn. Nhaø thaàu phuï phaûi kòp thôøi ñeä trình Tö vaán pheâ duyeät vò trí vaø kích thöôùc cöûa soå baûo trì trong beà maët coâng trình hoaøn thieän vaø khu vöïc ngoaøi trôøi ñeå coù theå ñöa vaøo thi coâng. Nhaø thaàu chính cung caáp cöûa soå baûo trì treân beà maët coâng trình. Vò trí chính xaùc cuûa caùc cöûa soå baûo trì ñöôïc neâu treân baûn veõ trieån khai chi tieát thi coâng cuûa nhaø thaàu phuï.

(f) Van ñieàu chænh löu löôïng gioù Nhaø thaàu phuï phaûi cung caáp vaø laép ñaët van gioù vaän haønh baèng tay taïi vò trí qui ñònh ñeå ñieàu chænh heä thoáng ñieàu hoøa khoâng khí vaø thoâng gioù. Nhìn chung, van gioù phaûi ñöôïc cung caáp taïi nhöõng vò trí sau: ● Trong toaøn boä oáng gioù caáp, thaûi chính, nhaùnh, ñaàu noái gioù caáp ñeán FCU

vaø mieäng caáp gioù töôi ● Phía sau toaøn boä mieäng/ löôùi gioù caáp vaø xaû ● Taïi vò trí ñaáu noái oáng gioù meàm vaøo oáng gioù chính neáu oáng gioù meàm

ñöôïc söû duïng ñeå ñaáu noái vaøo mieäng gioù Toaøn boä van ñieàu chænh löu löôïng gioù phaûi tuaân theo tieâu chuaån DW/142 vaø ñöôïc cung caáp daïng hoäp vôùi maët bích ñöôïc saûn xuaát söû duïng rieâng tuaân theo tieâu chuaån veà kín gioù. Vaät lieäu söû duïng cho van gioù trong caùc voû phaûi laøm baèng theùp meàm maï keõm. Truïc van gioù ñöôïc cung caáp nieâm phuø hôïp. Khi ñi ngang qua voû vaø loã thuûng, phaûi ñöôïc haïn cheá baèng caùch söû duïng lieân keát beân trong. Söï roø ræ khoâng khí xung quanh van gioù phaûi nhoû hôn 5% luoàng gioù thieát keá toái ña taïi vò trí ñoùng hoaøn toaøn.




Van gioù coù ñoä daøy ñeán 300mm treân maët phaúng xoay phaûi laø loaïi van böôùm hoaëc laù ñôn coù laù van caáu truùc keùp, ñöôïc gaén xung quanh truïc hình vuoâng, meùp laù phaûi nhaün, khoâng caïnh saéc. Truïc phaûi ñöôïc beû xuoáng taïi moãi ñaàu vaø ñöôïc choáng treân nhöõng vaáu loài baèng ñoàng gaén vaøo caùc maët cuûa oáng gioù vôùi nhöõng giaù ñôõ hình reõ quaït ñoå saün taïi nhöõng vò trí coù theå tieáp caän vaø baèng caùch keïp sau khi ñieàu chænh. Van gioù gaén treân oáng gioù lôùn hôn 300mm phaûi laø loaïi löôõi ña laù ñoái xöùng, ñöôïc gaén treân khung döïng saün cheøn vaøo oáng gioù vaø ñöôïc baét buloâng. Nhöõng laù ñôn phaûi tuaân theo qui ñònh veà van böôùm (hoaëc laù ñôn). Moãi laù ñöôïc gaén treân truïc cöùng coù ñaàu gaén vaøo truïc loùt ñoàng hoaëc nylon. Nhoùm caùc laù van taïo thaønh van gioù phaûi ñöôïc noái vaøo theo cô caáu vaän haønh baèng tay. Cô caáu naøy phaûi ñöôïc kieåm soaùt baèng giaù ñôõ hình reõ quaït trong nhöõng voû nôi coù theå tieáp caän van gioù trong ñieàu kieän vaän haønh bình thöôøng. Trong caùc tröôøng hôïp khaùc, cô caáu naøy phaûi ñöôïc cung caáp baùnh raêng ñieàu khieån töø xa vaän haønh baèng vít coù nuùt leân giaây taïi moät ñieåm tieáp xuùc. Sau khi kieåm tra vaø ñieàu chænh laàn cuoái, toaøn boä van gioù phaûi ñöôïc keïp vaøo ñuùng vò trí seõ ñöôïc ñaùnh daáu treân giaù ñôõ hình reõ quaït.

(g) Van gioù 1 chieàu Cung caáp van gioù 1 chieàu theo qui ñònh treân baûn veõ vaø khi nhieàu hôn moät quaït ñöôïc gaén vaøo oáng gioù/ hoäp gioù huùt hoaëc thaûi. Toaøn boä khung vaø laù van phaûi ñöôïc laøm töø hôïp kim nhoâm cöôøng ñoä chòu löïc cao. Laù van phaûi ñöôïc thieát keá ñôn, gaén treân ñöôøng thoâng hôi laép nhoâm xoay treân truïc nylon maët bích. Van gioù töï ñoùng seõ taïo ra löïc caûn toái thieåu ñoái vôùi luoàng gioù döôùi ñieàu kieän vaän haønh vaø duy trì vò trí coá ñònh khi vaän haønh. Löïc caûn toái ña phaûi ñöôïc taïo ra trong ñieàu kieän luoàng gioù ngöôïc sao cho van gioù bò buoäc phaûi ñoùng. Thanh ñaøn hoài hoaëc nhöõng duïng cuï duøng cho muïc ñích khaùc phaûi ñöôïc cung caáp ñeå ngaên chaën tieáng keâu cuûa van gioù vaø laø coâng cuï hoã trôï ñeå nieâm kín khoâng khí trong ñieàu kieän doøng chaûy ngöôïc.

(h) Maët bích oáng gioù Maët bích duøng cho oáng gioù phaûi tuaân theo tieâu chuaån DW142/DW TM1 môùi nhaát. Chöùng nhaän kieåm tra tuaân thuû tieâu chuaån phaûi ñöôïc ñeä trình Tö vaán pheâ duyeät. Möùc ñoä roø ræ khoâng khí vaø söï bieán daïng maët bích phaûi ñöôïc chöùng nhaän ñaùp öùng tieâu chuaån DW142 vaø TM1. Kích thöôùc maët bích phaûi ñöôïc choïn loïc, tuaân thuû tieâu chuaån DW142 baûng soá 5 ñeán baûng soá 8. Maët bích phaûi laø loaïi cuoän troøn laøm baèng toân maï keõm nhuùng noùng theo tieâu chuaån BS 2989 G275. Söû duïng theùp khoâng gæ cho oáng gioù. Chaát traùm beà maët ñöôïc cung caáp bôûi nhaø saûn xuaát maët bích. Maët bích phaûi ñöôïc söû duïng taïi coâng tröôøng theo ñeà xuaát cuûa nhaø saûn xuaát. Maët bích phaûi ñöôïc keïp vaøo vôùi nhau baèng keïp khoaù ñinh oác. Söû duïng keïp thang loaïi ñinh oác taïi nhöõng vò trí khoù tieáp caän.




6.5 CHI TIEÁT ÑÔÕ, GIAÙ TREO VAØ GIAÈNG GIA COÁ OÁNG GIOÙ

Nhaø thaàu phuï chòu traùch nhieäm xaây caùc chi tieát ñôõ, v.v. Toaøn boä chi tieát coá ñònh phaûi ñöôïc ñeä trình Tö vaán pheâ duyeät.

Nhaø thaàu phuï phaûi cung caáp khung ñaøn hoài ñeå ngaên chaën söï truyeàn rung ñoäng töø oáng gioù thieát bò ñeán keát caáu.

Coâng taùc thi coâng giaù ñôõ phaûi tuaân theo tieâu chuaån DW/142. Toaøn boä giaù ñôõ phaûi ñöôïc cung caáp nhöõng ty ren hoaëc duïng cuï caêng ty ren ñeå ñieàu chænh cao ñoä cuûa ñöôøng oáng gioù. Khoâng ñöôïc haøn giaù ñôõ vaøo vaät treo. Ñaàu loài cuûa buloâng phaûi ñöôïc caét boû.

Trong baát kyø tröôøng hôïp naøo, khoâng ñöôïc vít hoaëc baét buloâng vaøo oáng gioù.

Toaøn boä oáng gioù theo chieàu thaúng ñöùng phaûi ñöôïc giöõ baèng vaät treo laøm töø saét goùc beân döôùi moái noái maët bích.

Toaøn boä giaù ñôõ oáng gioù phaûi ñöôïc thöïc hieän nhö sau:

Vò trí Chi tieát ñôõ vaø giaù ñôõ

Ngoaøi trôøi Maï keõm nhuùng noùng theo tieâu chuaån BS 729, coù lôùp phuû toái thieåu 85μm vaø lôùp sôn choáng epoxy

Trong nhaø Maï keõm nhuùng noùng theo tieâu chuaån BS 729, coù lôùp phuû toái thieåu 85μm

Coâng taùc sôn phaûi ñöôïc thöïc hieän theo qui ñònh trong phaàn “Sôn, Daùn nhaùn vaø Hoaøn thieän” cuûa Quy phaïm Kyõ thuaät naøy. Toaøn boä giaù ñôõ phaûi ñöôïc coá ñònh baèng buloâng, ñai oác hoaëc vít maï keõm hoaëc catmi theo tieâu chuaån BS 3382-Phaàn 1 vaø 2 vôùi ñoä daøy toái thieåu lôùp maï laø 25 μm.

Toaøn boä buloâng vaø ñai oác phaûi ñöôïc maï keõm hoaëc catmi theo tieâu chuaån BS 3382-Phaàn 1 vaø 2 vôùi ñoä daøy toái thieåu lôùp maï laø 25 μm.

OÁng gioù phaûi ñöôïc gaén chaët vaøo maët döôùi ñaø/ saøn. Sau khi caét ñaàu loài cuûa buloâng, caùc phaàn cuûa chi tieát ñôõ khoâng ñöôïc loài ra beân döôùi giaù ñôõ ñaùy ñeå duy trì chieàu cao toái ña töø ñaàu ñeán cuoái.

Chieàu daøi theùp goùc duøng gia coâng caùc giaù ñôõ, maët bích vaø gaêng thanh giaèng phaûi ñöôïc caét töø nhöõng ñoaïn ñuû chieàu daøi qui ñònh. Nhöõng ñoaïn ngaén ñöôïc haøn ñoái ñaàu laïi vôùi nhau ñeå taïo thaønh ñoaïn daøi hôn seõ khoâng ñöôïc duøng.

Toaøn boä chi tieát giaù ñôõ phaûi ñöôïc ñaët gaàn moái noái ngang hoaëc gaêng thanh giaèng.

Toaøn boä oáng gioù phaûi ñöôïc thieát keá caån thaän, ñöôïc caáp caùc neo caàn thieát vaø noái meàm ñeå ngaên chaën söï hö haïi oáng gioù hoaëc keát caáu coâng trình do söï co giaõn cuûa oáng gioù hoaëc coâng trình.

Toaøn boä ñieåm neo vaø noái meàm phaûi ñöôïc theå hieän treân baûn veõ trieån khai chi tieát thi coâng vaø phaûi ñöôïc tö vaán pheâ duyeät tröôùc khi tieán haønh laép ñaët neo hoaëc gaén coá ñònh vaøo keát caáu coâng trình.




6.6 MIEÄNG GIOÙ (a) Toång quaùt

Toaøn boä cöûa gioù, mieäng caáp gioù, löôùi gioù, cöûa gioù vaïch vaø nhöõng thieát bò gioù ñaàu cuoái phaûi laø loaïi ñöôïc chaáp thuaän theo qui ñònh trong nhöõng ñieàu khoaûn sau vaø nhö ñöôïc theå hieän treân baûn veõ heä thoáng MVAC. Nhaø thaàu phuï phaûi ñeä trình Tö vaán nhöõng con soá hieäu suaát cho moãi kích côõ vaø chuûng loaïi thieát bò caáp gioù ñaàu cuoái bao goàm nhöõng thoâng tin sau. ● Toác ñoä beà maët/ Ñoä suït aùp tónh ● Chieàu daøi gioù thoåi ôû toác ñoä ñaàu cuoái laø 0.25 m/s vaø 0.75 m/s ● Döõ lieäu ñoä oàn thöïc hieän trong phoøng caùch aåm vaø döïa treân tieâu chuaån

ASHRAE 36-72 Coâng taùc boá trí traàn, loaïi ñaù laùt vaø heä thoáng treo bao goàm caû thieát bò gioù ñaàu cuoái phaûi ñöôïc kieåm tra tröôùc khi ñaët haøng. Van ñieàu chænh löu löôïng gioù loaïi laù ñoái xöùng phaûi ñöôïc caáp phía sau löôùi gioù caáp, hoài, xaû vaø truyeàn gioù, mieäng caáp gioù vaø löôùi gioù ñeå kieåm soaùt toác ñoä luoàng gioù thoåi. Neáu oáng gioù meàm ñöôïc söû duïng ñeå ñaáu noái vaøo mieäng laáy gioù, oáng gioù meàm phaûi ñöôïc gaén van böôùm taïi ñieåm ñaáu noái oáng gioù meàm vaøo oáng gioù chính. Vaät tö maãu cuûa moãi loaïi mieäng laáy gioù ñöôïc cung caáp phaûi ñöôïc ñeä trình Tö vaán pheâ duyeät. Vaät tö maãu ñöôïc cung caáp coù beà maët hoaøn thieän theo qui ñònh vaø maøu saéc ñöôïc chæ ñònh. Chaát löôïng vaät tö phaûi ñöôïc duy trì cho ñeán khi hoaøn thaønh coâng trình. Beà maët hoaøn thieän vaø maøu saéc cuûa toaøn boä mieäng laáy gioù ñöôïc laép ñaët phaûi töông xöùng vôùi vaät tö maãu ñöôïc cung caáp. Neáu ñöôïc gaén phía sau löôùi gioù, mieäng caáp gioù, cöûa gioù, thieát bò kieåm tra löu löôïng gioù phaûi ñöôïc hoaøn thieän baèng sôn ñen môø. Van gioù loaïi laù ñoái xöùng phaûi coù laù van ñöôïc gaén vaøo vôùi nhau thaønh caùc ñoaïn ñeå vaän haønh ñoâi töø vít ñieàu chænh. Neáu van gioù loaïi laù ñoái xöùng ñöôïc gaén vaøo phía sau mieäng laáy gioù hoaëc löôùi gioù, vít coù theå tieáp caän ñöôïc thoâng qua laù van cuûa mieäng caáp gioù. Neáu van gioù loaïi laù aùp leân ñöôïc gaén vaøo ñaàu ñöïc oáng gioù phía sau mieäng laáy gioù, coù theå ñieàu chænh vít baèng caùch di chuyeån mieäng caáp gioù hoaëc löôùi gioù. Mieäng laáy gioù phaûi ñöôïc gaén coá ñònh söû duïng vít chìm. Vieäc gaén noåi khoâng ñöôïc chaáp thuaän. Nhaø thaàu phuï phaûi lieân heä nhaø thaàu chính ñeå ñöôïc cung caáp nhöõng chi tieát veà mieäng laáy gioù bao goàm chi tieát thi coâng, gaén laép vaø kích thöôùc ñeå ñieàu chænh phuï kieän vaø hieäu suaát. Baûn veõ trieån khai chi tieát thi coâng moâ taû coâng taùc thi coâng vaø caùc chi tieát coù lieân quan phaûi ñöôïc ñeä trình Tö vaán pheâ duyeät. Sau khi Tö vaán pheâ duyeät vaät tö maãu laàn ñaàu, nhaø thaàu phuï phaûi cung caáp vaät tö ñeå laép ñaët thöû. Sau khi Tö vaán chaáp thuaän, nhöõng ñôït vaät tö maãu seõ ñöôïc saûn xuaát vaø vaän chuyeån ñeán coâng tröôøng. Nhaø thaàu phuï phoái hôïp vôùi nhaø thaàu chính vaø caùc nhaø thaàu phuï khaùc ñeå laép vaø gaén mieäng caáp gioù.




Nhaø thaàu phuï phaûi laép ñaët mieäng caáp gioù vaøo ñuùng vò trí theo sô ñoà traàn giaû do nhaø thaàu chính ñöa ra. Nhaø thaàu chính chòu traùch nhieäm laép ñaët taám traàn. Nhaø thaàu phuï phaûi kòp thôøi cung caáp cho nhaø thaàu chính nhöõng yeâu caàu tieáp caän traàn giaû ñeå laép ñaët cho phuø hôïp. Vieäc ñieàu chænh löu löôïng gioù phaûi ñöôïc thöïc hieän ôû maët tröôùc baèng khoaù khoâng coù thieát bò loài ra. Kích thöôùc coå truïc phaûi ñöôïc löïa choïn döïa treân löu löôïng gioù thöïc teá, duy trì möùc phaân phoái gioù thích hôïp vaø möùc ñoä oàn ôû möùc cho pheùp. Cung caáp ñeäm khoâng deã chaùy nhaèm ngaên ngöøa söï roø ræ khoâng khí vaø ngaên chaën söï ngöng tuï hôi nöôùc. Beà maët beân trong coù theå thaáy ñöôïc töø beân döôùi phaûi ñöôïc sôn ñen môø.

(b) Mieäng caáp gioù traàn hình chöõ nhaät Mieäng caáp gioù traàn hình chöõ nhaät phaûi laø loaïi maët caùc caùnh khuyeách taùn ñieàu chænh ñöôïc, ña laù, coù loõi ñöôïc thieát keá nhaèm cung caáp löôïng gioù troän ñaày ñuû maø khoâng gaây khoù khaên cho moät, hai, ba hoaëc boán loái xaû gioù. Moãi maët cuûa mieäng caáp gioù phaûi cung caáp ñuùng löu löôïng gioù caàn thieát cho khu vöïc caáp. Mieäng caáp gioù traàn phaûi phuø hôïp ñeå gaén vaøo vò trí taám traàn treân traàn treo baèng thanh T loä ra ngoaøi vaø phaûi phuø hôïp ñeå gaén beân ngoaøi treân loaïi traàn ñaëc bieät. Mieäng caáp gioù coù beà maët hoaøn thieän maï ñieän maøu, baèng nhoâm theo chæ daãn vaø pheâ duyeät cuûa Tö vaán. Mieäng gioù daïng laù beà maët ñuïc loã phaûi tuaân theo yeâu caàu cuûa nhaø saûn xuaát. Mieäng gioù naøy ñöôïc duøng trong phoøng vaän haønh nhö ñöôïc lieät keâ treân baûn veõ.

(c) Mieäng caáp gioù daïng löôùi Tröø phi ñöôïc qui ñònh khaùc treân baûn veõ, mieäng caáp gioù daïng löôùi phaûi laø loaïi gaén maët bích coù cöûa laáy gioù coù theå ñieàu chænh theo chieàu ngang ôû phía tröôùc cöûa laáy gioù theo chieàu doïc. Khung vaø caùnh ñoåi höôùng phaûi ñöôïc laøm baèng nhoâm ñuùc, maï ñieän maøu theo chæ daãn vaø pheâ duyeät cuûa Tö vaán. Kích thöôùc löôùi ñöôïc qui ñònh treân baûn veõ laø kích thöôùc coå truïc coù loõi hoaëc caùc chi tieát vaø loã thaêm cho löôùi phaûi tuaân theo pheâ duyeät cuûa Tö vaán.

(d) Mieäng gioù phaân phoái gioù caáp daïng ñöôøng thaúng Mieäng gioù phaûi laøm baèng nhoâm ñuùc coù van kieåm soaùt maãu gioù coù theå ñieàu chænh cho nhöõng ñoaïn ñoäng vaø taám che oâ troáng cho nhöõng ñoaïn khoâng hoaït ñoäng. Mieäng gioù phaûi laø loaïi maët bích. Toaøn boä chieàu daøi mieäng gioù ñöôïc laép ñaët sao cho khoâng loä ra nhöõng phuï kieän keïp chaët. Söû duïng duïng cuï caên chænh haøng ñeå caên thaúng haøng caùc mieäng gioù. Caáp gioù ñeán ñoaïn ñoäng cuûa moãi mieäng gioù baèng taéc keâ trong oáng gioù hoaëc hoäp gioù coù ñaàu noái ñeå ñaáu noái oáng gioù meàm, troøn. Oáng hoaëc hoäp gioù phaûi ñöôïc caùch nhieät beân ngoaøi. Moãi oáng hoaëc hoäp gioù phaûi ñöôïc gaén van böôùm. Kích thöôùc oáng hoaëc hoäp gioù phaûi tuaân theo qui ñònh treân baûn veõ.




Tröø phi ñöôïc qui ñònh khaùc treân baûn veõ, cöûa gioù vaïch phaûi laøm baèng nhoâm ñuùc vôùi beà maët hoaøn thieän maï ñieän theo chæ daãn vaø pheâ duyeät cuûa Tö vaán. Beà maët beân trong coù theå thaáy ñöôïc töø beân döôùi phaûi ñöôïc sôn ñen môø.

(e) Mieäng gioù phaân phoái caáp gioù traàn Mieäng gioù phaân phoái caáp gioù traàn phaûi laø loaïi gaén maët bích vôùi laù van gaén coá ñònh theo chieàu ngang, nghieâng 1 goùc 150. Khung vaø laù van phaûi laøm baèng nhoâm, beà maët hoaøn thieän maï ñieän maøu theo chæ daãn vaø pheâ duyeät cuûa tö vaán. Kích thöôùc löôùi ñöôïc qui ñònh treân baûn veõ laø kích thöôùc coå truïc coù loõi hoaëc caùc chi tieát. Loã thaêm cho löôùi phaûi tuaân theo pheâ duyeät cuûa Tö vaán

(f) Mieäng gioù hoài, gioù thaûi vaø chuyeån gioù Löôùi gioù bao goàm laù saùch nhoâm gaén ngang ñuôïc gaén coá ñònh vaøo khung nhoâm, bao quanh baèng maët bích. Löôùi gioù phaûi laø loaïi laù saùch ñôn, ñöôïc gaén coá ñònh vaøo khung. Chieàu daøi laù van khoâng truï ñôõ khoâng vöôït quaù 300mm. Löôùi gioù khoâng phaùt ra tieáng keâu vaø khoâng rung khi heä thoáng hoaït ñoäng. Löôùi gioù phaûi coù beà maët hoaøn thieän maï ñieän theo chæ daãn vaø pheâ duyeät cuûa tö vaán. Neáu söû duïng löôùi gioù kieåu toå ong, löôùi phaûi ñöôïc laøm baèng nhoâm ñuùc, caùch nhau 20mm, ñöôïc gaén coá ñònh vaøo khung nhoâm. Luôùi coù beà maët hoaøn thieän maï ñieän theo chæ daãn vaø pheâ duyeät cuûa tö vaán. ÔÛ nhöõng nôi ñöôïc yeâu caàu söû duïng löôùi nhö treân baûn veõ thì löôùi phaûi ñöôïc laøm baèng daây theùp meàm, caùch nhau 12mm, ñöôïc haøn vaøo vôùi nhau vaø gaén coá ñònh vaøo khung theùp meàm. Löôùi phaûi ñöôïc maï keõm vaø sôn theo chæ daãn vaø pheâ duyeät cuûa tö vaán.

(g) Mieäng gioù hoài gaén traàn Löôùi gioù bao goàm laù saùch nhoâm gaén ngang ñuôïc gaén coá ñònh vaøo khung nhoâm, bao quanh baèng maët bích. Löôùi gioù phaûi laø loaïi laù saùch ñôn, ñöôïc gaén coá ñònh vaøo khung. Chieàu daøi laù van khoâng truï ñôõ khoâng vöôït quaù 300mm. Löôùi gioù khoâng phaùt ra tieáng keâu vaø khoâng rung khi heä thoáng hoaït ñoäng. Löôùi gioù phaûi coù beà maët hoaøn thieän maï ñieän theo chæ daãn vaø pheâ duyeät cuûa tö vaán. Neáu söû duïng löôùi gioù kieåu toå ong, löôùi phaûi ñöôïc laøm baèng nhoâm ñuùc, caùch nhau 20mm, ñöôïc gaén coá ñònh vaøo khung nhoâm. Luôùi coù beà maët hoaøn thieän maï ñieän theo chæ daãn vaø pheâ duyeät cuûa tö vaán. ÔÛ nhöõng nôi ñöôïc yeâu caàu söû duïng löôùi nhö treân baûn veõ thì löôùi phaûi ñöôïc laøm baèng daây theùp meàm, caùch nhau 12mm, ñöôïc haøn vaøo vôùi nhau vaø gaén coá ñònh vaøo khung theùp meàm. Löôùi phaûi ñöôïc maï keõm vaø sôn theo chæ daãn vaø pheâ duyeät cuûa tö vaán.

6.7 CAÙCH NHIEÄT VAØ CAÙCH AÂM (a) Caùch nhieät beân ngoaøi

Coâng taùc caùch nhieät phaûi tuaân theo yeâu caàu cuûa tieâu chuaån BS 476-Phaàn 7 vaø FSD. Tröø phi ñöôïc qui ñònh khaùc, chaát caùch nhieät phaûi laøm baèng sôïi thuûy tinh cöùng, khoái löôïng 48kg/m3, daãn nhieät khoâng lôùn hôn 0.034 W/mK ôû nhieät ñoä 250C.




Chaát caùch nhieät phaûi laøm baèng lôùp nhoâm choáng aåm gia coá sôïi hai maët. Löôùi gia coá sôïi khoâng ñöôïc lôùn hôn 10mm x 10mm. Ñoä daãn aåm khoâng nhoû hôn 0.3ng/Ns vaø söï choáng thuûng khoâng nhoû hôn 2 Joules. Thoâng thöôøng oáng gioù phaûi ñöôïc caùch ly khoûi giaù treo vaø chi tieát ñôõ nhö qui ñònh trong DW/142. Sôïi thuûy tinh phaûi ñöôïc gaén vaøo oáng gioù baèng keo traùt ngaên löûa. Keo traùt phaûi ñöôïc boâi ñeàu sao cho chaát caùch nhieät phuû ñeàu vaø kín beà maët oáng gioù. Ñoái vôùi oáng gioù coù chieàu roäng ñeán 450mm, quaán lôùp caùch nhieät xung quanh oáng gioù. Ñoái vôùi oáng gioù theo phöông ngang hôn 450mm, gaén choát kim loaïi vaøo maët ñaùy oáng, caùch taâm toái ña 400mm. Lôùp caùch nhieät phaûi ñöôïc quaán xung quanh oáng gioù thaúng ñöùng hôn 450mm, choát ñöôïc ñaët taïi taát caû caùc maët cuûa oáng gioù, caùch taâm khoaûng 300mm. Ñaàu loài choát kim loaïi ñöôïc caét boû sau khi caøi neïp. Beà maët lôùp ngaên aåm phaûi ñöôïc nieâm kín baèng mastic hoaëc baêng keo ngaên aåm nôi choát kim loaïi xuyeân qua. Toaøn boä moái noái phaûi ñöôïc nieâm kín baèng baêng keo ngaên aåm chieàu roäng toái thieåu 75mm ñeå taïo ra nieâm ngaên aåm beân ngoaøi lieân tuïc. Tröôùc khi daùn baêng keo, toaøn boä beà maët tieáp xuùc cuûa taám ngaên aåm phaûi ñöôïc lau saïch buïi, daàu môõ baèng khaên vaø dung moâi thích hôïp theo ñeà xuaát cuûa nhaø saûn xuaát. Lôùp caùch nhieät oáng gioù phaûi ñöôïc keùo daøi treân khaép maët bích vaø lôùp keo beân ngoaøi. Lôùp caùch nhieät phaûi ñöôïc thöïc hieän sao cho taïo thaønh lôùp ngaên ngaên aåm vaø nhieät lieân tuïc, khoâng coù loã hoång, loã troáng hoaëc ñaàu môû. Phaûi caån thaän thöïc hieän ñeå duy trì ñöôïc ñoä daøy toái thieåu caùc caùc goùc, ñaàu loài. Taïi ñieåm chi tieát ñôõ, vaät lieäu khoái goã cöùng hoaëc Styrofoam phaûi ñöôïc ñaët taïi vò trí ñaûm baûo söï ñoàng boä cuûa lôùp ngaên aåm baèng caùch haøn chi tieát ñôõ vaøo lôùp caùch nhieät. Toaøn boä oáng gioù caùch nhieät beân ngoaøi loä ra trong phoøng maùy, ngoaøi trôøi vaø nhöõng vò trí deã thaáy phaûi ñöôïc bao boïc beân ngoaøi baèng theùp maï keõm daøy 0.8mm, tröø phi ñöôïc qui ñònh khaùc treân baûn veõ. Caùc moái noái choaøng vaøo nhau vaø ñöôïc baét ñinh oác boïc taïi vò trí caùch taâm 100mm maø khoâng gaây hö haïi ñeán lôùp ngaên aåm cuûa lôùp caùch nhieät sôïi thuûy tinh. Lôùp sôn baûo veä phaûi ñöôïc ngaên kín nöôùc baèng ñeäm hoaëc chaát traùm taïi nhöõng vò trí ngoaøi trôøi.

(b) Caùch nhieät + caùch aâm beân trong Coâng taùc caùch nhieät phaûi tuaân theo yeâu caàu cuûa tieâu chuaån BS 476-Phaàn 7 vaø FSD. Tröø phi ñöôïc qui ñònh khaùc, chaát caùch nhieät phaûi laøm baèng sôïi thuûy tinh cöùng, khoái löôïng 64kg/m3, daãn nhieät khoâng lôùn hôn 0.034 W/mK ôû nhieät ñoä 250C. Beà maët ñöôïc baûo veä baèng lôùp toân soi loã daøy 0.5mm vôùi dieän tích loã môû 30%. Beà daøy caùch nhieät nhö ñöôïc chæ ñònh treân baûn veõ. Sôïi thuûy tinh phaûi ñöôïc gaén vaøo oáng gioù baèng keo daùn choáng löûa. Keo daùn phaûi ñöôïc boâi ñeàu sao cho chaát caùch nhieät phuû ñeàu vaø kín beà maët oáng gioù. Toaøn boä moái noái phaûi ñöôïc nieâm kín baèng baêng keo ngaên aåm chieàu roäng toái thieåu 75mm ñeå taïo ra nieâm ngaên aåm beân ngoaøi lieân tuïc. Tröôùc khi daùn baêng keo, toaøn boä beà maët tieáp xuùc cuûa taám ngaên aåm phaûi ñöôïc lau saïch buïi, daàu môõ baèng khaên vaø dung moâi thích hôïp theo ñeà xuaát cuûa nhaø saûn xuaát.




Lôùp caùch nhieät oáng gioù phaûi ñöôïc keùo daøi treân khaép maët bích vaø lôùp keo beân ngoaøi.

(c) Caùch nhieät oáng gioù Tröø phi ñöôïc qui ñònh treân baûn veõ, toaøn boä oáng gioù phaûi ñöôïc caùch nhieät beân ngoaøi. Ñoä daøy lôùp caùch nhieät nhö sau:

Nhieäm vuï Vò trí Ñoä daøy lôùp caùch nhieät

Oáng gioù caáp vaø hoài (coù ñieàu hoaø khoâng khí)

Moïi vò trí 25mm, tröø phi ñöôïc qui ñònh khaùc treân baûn veõ

Beân ngoaøi vaø oáng thoâng gioù Taïi nôi coù ÑHKK:

Trong loã traàn döôùi maùi

Trong ñöôøng thoâng hôi baèng beâtoâng

25mm

0

0

Oáng gioù thaûi nhaø veä sinh vaø oáng truyeàn gioù

Moïi vò trí 25mm

(d) Khoâng thi coâng lôùp caùch nhieät cho ñeán khi oáng gioù vaø thieát bò ñaõ ñöôïc thöû nghieäm aùp löïc theo qui ñònh

(e) Lôùp caùch nhieät phaûi ñöôïc thöïc hieän ñeå taïo ra beà maët trôn laùng, ñoàng nhaát. Nhöõng ñoaïn cöùng phaûi ñoàng taâm vaø coù ñoä daøy baèng nhau. Khoâng chaáp nhaän dôïn soùng beà maët. Loaïi boû caùc ñoaïn hoaëc saøn coù ñaàu hoaëc meùp bò hö hoûng

(f) Lôùp caùch nhieät phaûi vöøa khít vôùi beà maët, saøn vaø ñoaïn phaûi kín nhau, meùp noái saùt caïnh nhau phaûi ñöôïc noái goùc, taïo caïnh nghieâng caân xöùng hoaëc ñöôïc taïo hình neáu caàn. Khe hôû nhoû trong lôùp caùch nhieät phaûi ñöôïc laáp vaø nieâm kín

(g) Lôùp caùch nhieät ñöôïc duøng treân beà maët khoâ vaø saïch, khoâng chöùa taïp chaát nhö daàu môõ, xæ saét hoaëc buïi Caùc beà maët ñöôïc caùch nhieät coù daáu hieäu bò ræ seùt hoaëc hö hoûng lôùp maï phaûi ñöôïc laøm nhaün vaø chaø nhaùm neáu caàn ñeå loaïi boû lôùop ræ seùt, v.v. tröôùc khi caùch nhieät

(h) Chæ söû duïng chaát caùch nhieät khoâ vaø saïch. Thoâng thöôøng, chaát caùch nhieät phaûi ñöôïc duøng theo ñeà xuaát cuûa nhaø saûn xuaát

(i) Lôùp ngaên aåm phaûi ñöôïc nieâm kín xung quanh caùc giaù treo suoát lôùp caùch nhieät

(j) Cung caáp lôùp caùch nhieät lieân tuïc xuyeân suoát caùc oáng loùt. Moái noái caùch nhieät phaûi ñöôïc taïi vò trí tieän cho moái noái treân heä thoáng oáng gioù phuï trôï

(k) Neáu oáng gioù ñi xuyeân qua töôøng vaø saøn, phaûi cung caáp lôùp caùch nhieät ngaên chaùy phuø hôïp cho oáng gioù, bao goàm van gioù choáng chaùy. Phaûi lieân tuïc duy trì lôùp caùch nhieät

6.8 NIEÂM KÍN VAØ CHOÁNG DOÄT




Neáu oáng gioù ñi xuyeân qua töôøng, saøn, v.v., nhaø thaàu phuï phaûi cung caáp oáng loùt baèng theùp 18 gauge. Neáu oáng loùt ñöôïc gaén xuyeân qua saøn, oáng loùt phaûi ñöôïc keùo ra xa toái thieåu caùch saøn 12 mm.

OÁng loùt phaûi coù kích thöôùc vöøa ñuû ñeå caùc oáng coù theå chuyeån ñoäng töï do. Hôn nöõa, neáu oáng gioù ñöôïc caùch nhieät, oáng loùt phaûi coù kích thöôùc lôùn hôn ñeå lôùp caùch nhieät xuyeân qua oáng loùt.

Cung caáp loã thuûng xuyeân maùi coù lôùp phuû choáng aûnh höôûng thôøi tieát vaø leà thaúng ñöùng.

Neáu oáng gioù ñi xuyeân qua töôøng hoaëc ñaø saøn ngaên chaùy, phaûi cung caáp ron ngaên chaùy baèng kim loaïi xung quanh oáng gioù.

Neáu oáng gioù ñi xuyeân qua keát caáu taøo nhaø, loã xuyeân qua phaûi coù chi tieát nhö sau:

● OÁng loùt coù kích thöôùc lôùn hôn phaûi ñöôïc cheøn vaøo, taïo ra loã troáng khoaûng 12-15mm xung quanh oáng gioù. Loã troáng naøy phaûi ñöôïc cheøn len khoaùng, khoái löôïng 80 kg/m3. Caùc ñaàu bao bì phaûi ñöôïc cheøn hôïp chaát mastic ngaên nöôùc, taïo ra nieâm kín gioù vaø kín nöôùc

● Neáu oáng gioù ñöôïc caùch nhieät, lôùp caùch nhieät phaûi ñöôïc ngaét ôû hai ñaàu oáng loùt, nieâm kín beà maët lôùp caùch nhieät vaø ñaàu oáng loùt ñöôïc cung caáp baèng caùch saép ñaët oáng gioù ñôn, söû duïng loaïi vaät lieäu coù troïng löôïng beà maët toài thieåu laø 5 kg/m2.




6.9 ÑIEÅM KIEÅM TRA

Loã oáng pitot ño aùp suaát tónh, aùp suaát toång cuûa doøng khoâng khí phaûi ñöôïc cung caáp taïi nhöõng vò trí sau:

● Taïi taát caû caùc quaït (trong ñoaïn thaúng nhaát cuûa oáng gioù, caïnh mieäng laáy gioù)

● Taïi caùc nhaùnh chính sau khi ñieàu chænh van gioù ● Taïi caùc daøn coil laïnh (caû tröôùc vaø sau daøn coil)

Taïi caùc vò trí khaùc qui ñònh treân baûn veõ.

Vò trí caùc loã naøy phaûi ñöôïc tö vaán pheâ duyeät.

Treân oáng gioù caùch nhieät, caùc loã phaûi ñöôïc chia ra theo ñoä daøy lôùp caùch nhieät.

Loã thöû nghieäm coù ñöôøng kính 25mm vaø ñöôïc cheøn nieâm coù theå thaùo dôõ. Nieâm phaûi ñöôïc caùch nhieät phuø hôïp.

Loã oáng pitot qui ñònh trong heä thoáng oáng gioù aùp suaát trung bình vaø cao phaûi söû duïng phuï kieän phuø hôïp.

Caùc loã oáng pilot phaûi ñöôïc ñaët taïi caùc maët chieàu daøi thaúng cuûa oáng gioù. Kích thöôùc oáng khoâng nhoû hôn hai laàn ñöôøng cheùo oáng gioù hình chöõ nhaät hoaëc hai laàn ñöôøng kính oáng gioù hình troøn phía döôùi, khoâng nhoû hôn hai laàn ñöôøng cheùo oáng gioù hoaëc moät laàn ñöôøng kính oáng gioù phía treân cuûa caùc co, teâ, noái, v.v.. Soá löôïng vaø vò trí loã pilot ñöôïc cung caáp taïi moãi vò trí nhö sau:

(a) OÁng gioù troøn

● Ñoái vôùi oáng gioù coù ñöôøng kính ñeán 1200mm, cung caáp hai loã thaønh ñöôøng taâm vuoâng goùc

● Ñoái vôùi oáng gioù coù ñöôøng kính lôùn hôn 1200mm, cung caáp 4 loã taïo thaønh hai caëp ñöôøng taâm vuoâng goùc. Hai caëp naøy ôû vò trí caùch nhau 450

(b) OÁng gioù hình chöõ nhaät

● Ñoái vôùi oáng gioù coù ñöôøng cheùo ñeán 450mm, cung caáp 6 loã, ñaët hai beân ñöôøng vuoâng goùc, moãi beân 3 loã. Loã phaûi ñöôïc ñaët taïi vò trí 1/6, 1/2 vaø 5/6 ôû hai maët oáng gioù

● Ñoái vôùi oáng gioù coù ñöôøng cheùo ñeán 900mm, cung caáp 8 loã, ñaët hai beân ñöôøng vuoâng goùc. Loã phaûi ñöôïc ñaët taïi vò trí 1/8, 3/8, 5/8 vaø 7/8 ôû hai maët oáng gioù

● Ñoái vôùi oáng gioù coù ñöôøng cheùo ñeán 2300mm, cung caáp 10 loã, ñaët hai beân ñöôøng vuoâng goùc. Loã phaûi ñaët taïi vò trí 1/10, 3/10, 5/10, 7/10 vaø 9/10 ôû hai maët oáng gioù

● Ñoái vôùi oáng gioù coù ñöôøng cheùo lôùn hôn 2300mm, cung caáp 12 loã ñaët hai beân ñöôøng vuoâng goùc. Loã phaûi ñaët taïi vò trí 1/12, 1/14, 5/12. 7/12, 3/4 vaø 11/12 ôû hai maët oáng gioù




6.10 COÂNG TAÙC VEÄ SINH VAØ BAÛO VEÄ TRONG KHI THI COÂNG

Toaøn boä oáng gioù phaûi ñöôïc cheá taïo, vaän chuyeån ñeán coâng tröôøng vaø baûo quaûn trong khu vöïc khoâ vaø khoâng bò aûnh höôûng thôøi tieát. OÁng gioù phaûi döôïc phuû baèng taám plastic hoaëc vaûi nhöïa cho ñeán khi ñöôïc laép ñaët.

Tröôùc vaø trong khi laép ñaët, oáng gioù phaûi ñöôïc veä sinh saïch seõ, ñöôïc boïc kín ñaàu sao cho coù theå ngaên buïi vaø voâi vöõa.

Khoâng ñöôïc tieán haønh laép ñaët oáng gioù cho ñeán khi coù maùi che vaø thieát bò baûo veä phuø hôïp ñeå baûo veä oáng gioù khoûi bò hö haïi hoaëc bò taùc ñoäng bôûi thôøi tieát.

OÁng gioù laép ñaët ôû döôùi thaáp phaûi coù lôùp baûo veä baèng kim loaïi cöôøng ñoä cao theo pheâ duyeät cuûa tö vaán.

6.11 THÖÛ NGHIEÄM ROØ RÆ OÁNG GIOÙ

Nhaø thaàu phuï phaûi thöû nghieäm söï roø ræ oáng gioù theo qui ñònh trong phaàn “Nghieäm thu, thöû nghieäm, baûo trì” cuûa Quy phaïm Kyõ thuaät naøy.




7. HEÄ THOÁNG ÑÖÔØNG OÁNG VAØ PHUÏ KIEÄN

7.1 TOÅNG QUAÙT Phaàn naøy moâ taû nhöõng yeâu caàu chung cho heä thoáng ñöôøng oáng, van, phuï kieän, caùch nhieät söû duïng cho heä thoáng ÑHKK tröø phi nhöõng yeâu caàu chung bò huûy boû bôûi nhöõng yeâu caàu cuï theå trong Quy phaïm Kyõ thuaät hoaëc treân baûn veõ. Nhaø thaàu phuï phaûi cung caáp vaø laép ñaët toaøn boä ñöôøng oáng, van vaø phuï kieän sao cho heä thoáng ñöôøng oáng vaän haønh chính xaùc vaø ñaùp öùng yeâu caàu qui ñònh trong Quy phaïm Kyõ thuaät naøy. Khoâng cho pheùp ñöôøng oáng loä ra ngoaøi ôû nhöõng khu vöïc söû duïng maø khoâng ñöôïc pheùp cuûa tö vaán. Kích thöôùc qui ñònh cho oáng ñoàng hoaëc oáng plastic laø ñöôøng kính danh ñònh beân ngoaøi. Taát caû caùc ñöôøng oáng khaùc phaûi coù ñöôøng kính danh ñònh beân trong. Toaøn boä ñöôøng oáng ñöôïc taäp keát ñeán coâng tröôøng phaûi hoaøn toaøn môùi, ñöôïc buoäc giaûi maøu ñeå phaân bieät caùc loaïi khaùc nhau. Ñöôøng oáng phaûi ñöôïc laép ñaët ñuùng höôùng ñeå baûo ñaûm thoâng thoaùt nöôùc. Tröôùc khi laép ñaët, ñöôøng oáng khoâng ñöôïc coù gôø, xæ saét vaø phaûi saïch. Caùc ñaàu ñöôøng oáng phaûi ñöôïc choát ñeå ngaên buïi. Khi hoaøn taát, heä thoáng phaûi ñöôïc xuùc röûa baèng nöôùc saïch. Baûn veõ phaûi moâ taû kích thöôùc ñöôøng oáng vaø caùch thöùc laép ñaët caùc heä thoáng. Heä thoáng ñöôøng oáng phuï, co, phuï kieän, v.v. Nhöõng oáng phuï vaø co khoâng moâ taû treân baûn veõ phaûi ñöôïc phoái hôïp vôùi nhöõng nhaø thaàu khaùc, ñöôïc ño kích thöôùc taïi coâng tröôøng vaø phoái hôïp vôùi tö vaán xaùc ñònh nhöõng ñaëc tính veà keát caáu, caáp thoaùt nöôùc, chieáu saùng vaø caùc ñaëc tính khaùc thöôøng gaëp cho loaïi coâng trình naøy. Coâng taùc ñaáu noái thieát bò phaûi tuaân theo ñeà xuaát vaø pheâ duyeät cuûa nhaø saûn xuaát thieát bò. Toaøn boä ñöôøng oáng phaûi ñöôïc laép ñaët theo caùch thöùc ñaùp öùng qui ñònh veà keát caáu vaø kieán truùc, coù hình thöùc goïn vaø chuyeân nghieäp vaø ñöôïc boá trí sao cho döï phoøng ñuû cho söï co ngoùt beâ toâng, ñoä doác, söï ñieàu chænh ñoàng truïc vaø cöûa thaêm ñeå baûo trì vôùi khoaûng troáng khoâng nhoû hôn 50mm khoaûng troáng giöõa beà maët beân ngoaøi cuûa oáng (bao goàm caû lôùp caùch nhieät, neáu coù) vaø nhöõng heä thoáng vaø keát caáu khaùc. Phaûi döï phoøng cho coâng taùc thay theá oáng maø khoâng gaây aûnh höôûng ñeán caùc heä thoáng khaùc. Neáu coù hai hay nhieàu oáng chaïy cuøng moät ñöôøng, caùc oáng phaûi chaïy song song nhau vaø song song keát caáu coâng trình, ngoaïi tröø oáng döï phoøng theo yeâu caàu cho coâng taùc thoâng thoaùt nöôùc. Ñöôøng oáng phaûi ñöôïc cung caáp giaù ñôõ, chi tieát ñôõ, thanh daãn, neo, v.v theo tieâu chuaån BS 3974. Thuû tuïc vaø naêng löïc cuûa ngöôøi vaän haønh phaûi tuaân theo ñeà xuaát neâu trong nhöõng tieâu chuaån MVAC sau:

● Haøn ñöôøng oáng theùp meàm ● Tieâu chuaån thi coâng – Haøn oáng ñoàng




Khi thöïc hieän kieåm tra baèng maét vaø thöû nghieäm nhaän daïng, neáu moái haøn khoâng ñaït yeâu caàu, tö vaán coù quyeàn kieåm tra baèng caùch chuïp X-quang hoaëc thöïc hieän caùc phöông phaùp kieåm tra khaùc ñöôïc chaáp thuaän. Khi loãi haøn bò phaùt hieän, nhaø thaàu phuï phaûi chòu chi phí thöû nghieäm vaø chi phí söûa chöõa cho ñeán khi ñaït yeâu caàu cuûa tö vaán.

7.2 VAÄN HAØNH VAØ THÖÛ NGHIEÄM AÙP LÖÏC AÙp löïc vaän haønh nöôùc cuûa heä thoáng ñöôøng oáng phaûi caân baèng aùp löïc tónh cuûa heä thoáng coäng vôùi aùp löïc taét bôm (neáu coù) ñöôïc ñaáu noái vaøo heä thoáng ñoù. Neáu aùp löïc vaän haønh ñaït ñeán 2400 kPa, aùp löïc thöû nghieäm phaûi ñaït 1.5 laàn aùp löïc vaän haønh hoaëc 2400kPa, baát kyø thoâng soá naøo lôùn hôn. Neáu aùp löïc vaän haønh ñaït treân 2400 kPa, aùp löïc thöû nghieäp phaûi ñaït 1.25 laàn aùp löïc vaän haønh. Heä thoáng ñöôøng oáng vaø phuï kieän bao goàm van, v.v phuø hôïp vôùi aùp löïc vaän haønh qui ñònh trong baûn veõ sô boä.

7.3 VAÄT LIEÄU ÑÖÔØNG OÁNG

Ñöôøng oáng söû duïng cho caùc heä thoáng phaûi theo qui ñònh trong Baûng 1 döôùi ñaây:

Phaân loaïi ñöôøng oáng thaønh

Heä thoáng Tham chieáu Baûng 1

Ñöôøng oáng nöôùc laïnh vaø nöôùc saïch I

OÁng xaû nöôùc ngöng, oáng caáp theâm, oáng traøn, beå thu vaø co giaõn, hoaù chaát xöû lyù nöôùc

IV

OÁng gas vaø ñaáu noái vaøo FCU V

Baûng 1 - Chi tieát vaät lieäu ñöôøng oáng

Loaïi ñöôøng oáng

Loã danh ñònh (mm)

Tieâu chí kyõ thuaät

I ∅15 - ∅150 Theùp ñen theo tieâu chuaån AS 1835, AS 1836 hoaëc BS 1387, cöôøng ñoä cao, hoaëc tieâu chuaån ANSI B36.10 muïc 40

∅200 vaø hôn Theùp carbon ñen, haøn caùch ñieän (ERW 430), söû duïng theùp

loaïi 430 MPa theo tieâu chuaån BS 3600 vaø BS 3601 cho oáng ∅200 ñeán ∅500, vaø ñöôïc saûn xuaát baèng phöông phaùp hoà quang chìm cho oáng ∅600 vaø hôn

Ñoä daøy töôøng toái thieåu cho oáng theo tieâu chuaån 3600/3601:

• ∅200 - ∅300 : 6.3 mm • ∅350 - ∅400 : 8.0 m

II ∅15 - ∅150 Oáng theùp maï keõm theo tieâu chuaån BS 1387, cöôøng ñoä cao

III ∅15 - ∅150 OÁng theùp maï keõm theo tieâu chuaån BS 1387, cöôøng ñoä trung bình

IV ∅15 - ∅200 OÁng P.V.C. khoâng laøm meàm theo tieâu chuaån BS 3505-loaïi `D' (toái thieåu) tröø phi qui ñònh khaùc




Loaïi ñöôøng oáng

Loã danh ñònh (mm)

Tieâu chí kyõ thuaät

V ∅15 - ∅150 OÁng ñoàng coù chaát löôïng gas C106 theo tieâu chuaån BS 2871- phaàn 2 baûng 2 hoaëc AS 1432 loaïi B, ñöôïc taåy nhôøn vaø röûa saïch beân trong. Toâi oáng ñoàng ñöôøng kính ñaït 18mm O.D. Söû duïng oáng ñoàng hard-drawn cho oáng coù ñöôøng kính 22mm ñeán 108mm.

Ngoaøi ra, loaïi L tuaân theo tieâu chuaån ANSI B31.5

Coâng taùc thöû nghieäm taïi xöôûng phaûi ñöôïc thöïc hieän ñeå kieåm soaùt oáng vaø phuï kieän trong quaù trình saûn xuaát. Hoà sô thöû nghieäm phaûi coù saün cho tö vaán kieåm tra vaøo baát kyø luùc naøo trong khi saûn xuaát vaø thöû nghieäm. Nhaø saûn xuaát phaûi cung caáp giaáy chöùng nhaän oáng tuaân thuû tieâu chuaån cuûa Anh quoác vaø nhöõng tieâu chuaån töông ñöông ñöôïc chaáp thuaän nhö tieâu chuaån ANSI.

OÁng phaûi ñöôïc kieåm tra ñoä thaúng, söï ñoàng nhaát vaø ñöôøng kính.

7.4 MOÁI NOÁI, RAÉC-CO VAØ MAËT BÍCH OÁNG

Nhöõng phöông phaùp noái oáng thaúng sau ñaây seõ ñöôïc söû duïng.

Loaïi ñöôøng oáng Moái noái

I Söû duïng noái ren cho ñöôøng oáng ñeán ∅50 vôùi hôïp chaát noái theo tieâu chuaån BS 5292 hoaëc moái noái haøn

Moái noái haøn ñoái ñaàu cho ñöôøng oáng ∅65 vaø hôn

Ñöôøng oáng hôi nöôùc noùng coù moái noái haøn cho moïi kích thöôùc

II & III Noái ren cho ñöôøng oáng ñeán ∅50

Söû duïng maët bích baét ñinh oác cho ñöôøng oáng ∅65 vaø hôn theo tieâu chuaån BS 4504. Khoâng cho pheùp coù moái noái haøn

IV Moái noái dung moâi keát dính theo tieâu chuaån BS 4346 Phaàn I. Söû duïng dung moâi keát dính theo tieâu chuaån BS 4346 Phaàn 3

V Moái haøn thau theo tieâu chuaån BS 1723.

Phuï kieän maët bích, noái laõ ñaàu (chæ ñeán 20mm 0.D.) hoaëc phuï kieän daãn coù ñoàng hoaëc khoâng ñoàng. Coâng taùc haøn theo tieâu chuaån thi coâng MVAC: "Haøn oáng vaø taám ñoàng”

Raéc-co oáng vaø maët bích phaûi ñöôïc laép ñaët sao cho coù theå deã daøng thaùo dôõ oáng thaønh ñoaïn vaø taïi vò trí ñaáu noái vaøo caùc thaønh phaàn maùy vaø van.




Loaïi ñöôøng oáng Moái noái

I Söû duïng theùp, ñoàng deã uoán maøu ñen cho raéc-co maët töïa hình caàu cho ñöôøng oáng coù ñöôøng kính ñeán ∅50.

Maët bích haøn theùp meàm maøu ñen theo tieâu chuaån BS 4504, tuaân thuû aùp löïc vaän haønh qui ñònh cho ñöôøng oáng ∅50 vaø hôn.

Ngoaøi ra, ñoái vôùi ñöôøng oáng ∅100 vaø hôn, khôùp noái phaûi ñöôïc söû duïng taïi vò trí neâu treân baûn veõ hoaëc Quy phaïm Kyõ thuaät

II & III Söû duïng theùp, ñoàng deã uoán maï keõm cho raéc-co maët töïa hình caàu cho ñöôøng oáng coù ñöôøng kính ñeán ∅50 vôùi vaät lieäu noái theo tieâu chuaån BS 5292

Ñoái vôùi oáng theùp, ñoàng deã uoán, maï keõm ∅65 - ∅150 cho raéc-co maët töïa hình caàu vôùi vaät lieäu noái theo tieâu chuaån BS 5292 hoaëc maët bích coù vaáu loài baét ñinh oác theo tieâu chuaån BS 4504 Phaàn 1

V Duøng cho oáng thaúng

Moái noái giöõa caùc ñoaïn keá caän cuûa oáng, giöõa oáng vaø phuï kieän oáng, keå caû van phaûi ñöôïc thöïc hieän bôûi nhaø thaàu coù naêng löïc, theo qui ñònh cuûa cô quan chöùc naêng.

Maët bích ngaên aåm phaûi ñöôïc laøm töø vaät lieäu vaø theo phöông phaùp moâ taû trong tieâu chuaån BS4772 cho oáng gang deûo. Maët bích phaûi ñöôïc ñuùc beân trong oáng hoaëc phuï kieän maët bích ñöôïc gaén vaøo. Ñöôøng kính vaø ñoä daøy maët bích ngaên aåm phaûi töông ñöông vôùi möùc ñoä qui ñònh cho maët bích theo tieâu chuaån BS4504 veà ñöôøng kính danh ñònh cuûa oáng maø maët bích ngaên aåm seõ ñöôïc ñuùc vaøo. Khoâng söû duïng maët bích ngaên aåm loaïi baét vít.

Maët bích phaûi ñöôïc khoan, haøn hoaëc ren vaøo oáng vaø quay taïi ñuùng goùc ñeán truïc cuûa loã. Maët bích phaûi ñöôïc saûn xuaát theo tieâu chuaån BS4504, ñöôïc khoan theo möùc aùp suaát qui ñònh vaø trong baát kyø tröôøng hôïp naøo, khoâng ñöôïc nhoû hôn PN16. Maët bích phaûi ñöôïc noái baèng ñeäm vaø hôïp chaát noái, söû duïng ñai oác, bulon vaø voøng ñeäm khoaù coù ñuû ñoä caêng cho coâng suaát ñaëc tröng coù lieân quan. Bulon, ñai oác vaø voøng ñeäm gaén vaøo maët bích maï keõm baét phaûi ñöôïc maï keõm. Bulon, ñai oác vaø voøng ñeäm duøng cho maët bích noái oáng caáp nöôùc phaûi laøm baèng theùp khoâng gæ 316 tröø phi ñöôïc qui ñònh khaùc.

Neáu ñöôøng oáng ñöôïc noái vaøo caùc thaønh phaàn thieát bò coù maët bích baèng kim loaïi khoâng töông thích, maët bích caùch ly phaûi ñöôïc cheøn bulon nhöïa.

Raéc-co söû duïng hai maët coân baèng ñoàng vaø ñöôïc gaén ñai oác hình luïc giaùc phaûi ñöôïc laép ñaët ôû nhöõng ñoaïn caùch nhau khoâng quaù 15m vaø taïi vò trí ñöôïc qui ñònh ñeå thaùo dôõ treân nhöõng oáng ∅50 vaø nhoû hôn vaø ñeå baûo trì thieát bò.

Khoâng chaáp nhaän moái noái oáng beân trong töôøng, saøn, v.v.

Neáu khôùp noái oáng cô khí ñöôïc duøng cho oáng theùp deã uoán, khôùp phaûi laø loaïi adaptor maët bích hoaëc khôùp, do 'Viking Johnson' hoaëc haõng töông ñöông saûn xuaát theo pheâ duyeät cuûa tö vaán. Khôùp noái phaûi ñöôïc giöõ taïi vò trí qui ñònh treân baûn veõ.

Caùc khôùp noái, bulon vaø loã ñònh vò phaûi ñöôïc phuû lôùp sôn baûo veä taïi xöôûng.




7.5 PHUÏ KIEÄN OÁNG

Phuï kieän oáng phaûi laø loaïi ñöôïc qui ñònh döôùi ñaây cho caùc loaïi vaät lieäu oáng.

Söû duïng cuùt ñeå ñoåi höôùng oáng. Trong baát kyø tröôøng hôïp naøo, oáng phaûi ñöôïc uoán cong maø khoâng caàn duøng phuï kieän.

Co ñaûo daøi phaûi ñöôïc duøng hôn laø co troøn. Khoâng söû duïng cuùt hình vuoâng. Teâ phaûi laø loaïi maãu cuùt deã ñaûo hoaëc cuùt ñoâi ngoaïi tröø taïi vò trí ñöôïc qui ñònh duøng teâ hình vuoâng cho coâng taùc thoâng, thoaùt nöôùc.

Söû duïng giaûm leäch taâm taïi vò trí caàn thieát ñeå baûo ñaûm söï thoaùt hoaëc loaïi boû tuùi khí. Khoâng söû duïng oå truïc giaûm.

Phuï kieän phaûi tuaân theo nhöõng tieâu chuaån sau:

Loaïi ñöôøng oáng Phuï kieän

I Phuï kieän ñöôïc noái ren, baèng saét deã uoán maøu ñen theo tieâu chuaån BS 1256, hoaëc phuï kieän haøn cöôøng ñoä cao theo tieâu chuaån BS 1965 phaàn 1 cho oáng coù ñöôøng kính ñeán ∅50.

Phuï kieän haøn cöôøng ñoä cao theo tieâu chuaån BS 1965 phaàn 2 cho oáng ∅65 hoaëc lôùn hôn.

Ñöôøng oáng hôi nöôùc noùng coù phuï kieän cöôøng ñoä cao theo tieâu chuaån BS 1965 duøng cho caùc kích côõ

II & III Phuï kieän ñöôïc baét vít, baèng saét deã uoán theo tieâu chuaån BS 143 vaø BS 1256 cho oáng ∅15 - ∅150 vaø vaät lieäu noái theo tieâu chuaån BS 5292

IV Phuï kieän PVC khoâng deûo ñöôïc ñuùc khuoân theo tieâu chuaån BS 4346 phaàn 1; dung moâi theo tieâu chuaån BS 4346 phaàn 3

V Phuï kieän daãn baèng ñoàng cöôøng ñoä cao haøn baïc theo tieâu chuaån BS 864 phaàn 2 cho oáng ∅54

Phuï kieän baèng kim loaïi suùng haøn baïc cho oáng ∅67 vaø lôùn hôn

7.6 KYÕ THUAÄT HAØN HEÄ THOÁNG OÁNG SAÉT

Kyõ thuaät haøn hoà quang kim loaïi vaø oxy –acetylene cuûa heä thoáng oáng theùp theo tieâu chuaån II BS 4515.

Khoâng ñöôïc pheùp söû duïng kyõ thuaät haøn khí heä thoáng oáng theùp coù φ 65 vaø kyõ thuaät haøn noùi treân tröø khi coù söï cho pheùp tröôùc cuûa nhaø Tö vaán.

Qui trình haøn vaø tieâu chuaån haøn phaûi ñöôïc ñeä trình leân nhaø tö vaán ñeå pheâ duyeät tröôùc khi thöïc hieän baát cöù coâng vieäc naøo.

Caùc nhaân vieân coù lieân quan ñeán caùc hoaït ñoäng haøn phaûi coù giaáy chöùng nhaän naêng löïc do cô quan coù thaåm quyeàn caáp maø nhaø tö vaán chaáp thuaän. Nhöõng giaáy chöùng nhaän naøy seõ ñöôïc trình ra cho nhaø tö vaán tröôùc khi tieán haønh haøn. Moãi moái haøn phaûi coù moät daáu thích hôïp ñeå nhöõng ngöôøi coù lieân quan ñeán coâng vieäc naøy coù theå nhaän thaáy. Ñaây laø moät ñieàu hoaøn toaøn baét buoäc.




Nhöõng choã haøn noái hai ñaàu phaûi ñöôïc thöïc hieän coù hình “chöõ V ñôn” ôû nhöõng nôi maø ñaàu cuoái cuûa oáng seõ ñöôïc caét theo hình vuoâng vaø ñöôïc vaùt nghieâng vôùi caùc gôø raùp trong vaø ngoaøi ñöôïc thaùo ra. Caùc oáng ñöôïc saép xeáp thích hôïp tröôùc khi tieán haønh haøn vaø phaûi caån thaän trong khi thöïc hieän ñeå vieäc haøn khoâng taäp trung quaù möùc vaø giôùi haïn ôû noøng oáng.

Söû duïng caùc phuï kieän noái cuøng nhaø saûn xuaát ñeå tieán haønh haøn nhaùnh cho vöøa khôùp vôùi oáng. Caùc khe hôû trong oáng daãn chính ñöôïc ñònh hình moät caùch chính xaùc ñeå truøng vôùi caùc nhaùnh vaø caùc phaàn rôøi seõ ñöôïc maøi vaùt caïnh. Thaùo boû caùc gôø raùp tröôùc khi tieán haønh haøn vaø caùc oáng nhaùnh khoâng nhoâ ra ôû caùc noøng oáng.

Nhaø thaàu phuï coù traùch nhieäm cung caáp caùc giaøn taïm thích hôïp vaø baûo veä traùnh naéng möa ñeå coù theå tieán haønh haøn moät caùch thích hôïp. Khoâng thöïc hieän haøn khi:

● Khi beà maët cuûa vaät tö bò aåm öôùt ● Döôùi möa hay gioù lôùn ● Khi nhieät ñoä cuûa kim loaïi goác töø 50C hay thaáp hôn

Vì caùc haäu quaû nghieâm troïng neáu khoâng thöïc hieän haøn ñuùng trong phoøng maùy vaø phaân boå caùc ñöôøng oáng chính, nhaø thaàu phuï seõ thöôøng xuyeân giaùm saùt ñoäi nguõ coâng nhaân haøn cuûa mình.

Nhaø tö vaán coù quyeàn yeâu caàu thænh thoaûng caét 2% moái haøn ñeå kieåm tra. Neáu coù baát cöù moái haøn naøo neâu treân cho thaáy khuyeát ñieåm cuûa vaät tö hay tay ngheà cuûa coâng nhaân, thì moái haøn ñoù coù theå ñöôïc yeâu caàu boû ñi ñeán 4% caùc moái haøn. Neáu soá moái haøn khoâng ñaùp öùng yeâu caàu kieåm tra trong voøng khoaûng 4% thì coâng vieäc ñöôïc cho raèng khoâng ñaùp öùng tieâu chuaån cuûa nhaø tö vaán, nhaø tö vaán coù theå yeâu caàu thaùo boû caùc moái haøn. Nhaø thaàu phuï coù traùch nhieäm caét vaø söûa chöõa caùc moái haøn naøy ñeå kieåm tra.

Hôn nöõa, vì haäu quaû nghieâm troïng neáu khoâng thöïc hieän haøn ñuùng, ngoaøi nhöõng ñieàu neâu treân, moãi moái haøn treân oáng vaø thieát bò coù ñöôøng kính danh nghóa 350mm vaø lôùn hôn 5% caùc moái haøn maãu treân oáng vaø thieát bò φ300mm trôû xuoáng seõ ñöôïc kieåm tra baèng quy trình kieåm tra khoâng bò phaù huûy ñöôïc chaáp thuaän (chaúng haïn chuïp X quang hay töông töï). Nhaø thaàu phuï seõ ruùt ra ñöôïc taàm quan troïng cuûa coâng vieäc naøy, ranh giôùi cuûa caùc ñöôøng oáng chính vaø khung thôøi gian tieán haønh kieåm tra.

Caùc cuoäc kieåm tra caùc moái haøn seõ ñöôïc ghi cheùp laïi vaø chuyeån ñeán nhaø tö vaán theo maãu pheâ chuaån.

Khoâng tieán haønh haøn treân heä thoáng oáng maï keõm trong baát kyø tröôøng hôïp naøo.

Vieäc chuaån bò caùc moái haøn vaø caïnh haøn seõ do nhaø tö vaán kieåm tra.

7.7 CAÙC MOÁI HAØN TREÂN HEÄ THOÁNG OÁNG UPVC

Heä thoáng oáng nhöïa PVC ñöôïc haøn hoøa tan hay nhieät theo söï ñeà nghò cuûa nhaø saûn xuaát vaø ñöôïc neâu chi tieát trong Quy phaïm kyõ thuaät naøy.

Neáu söû duïng kyõ thuaät haøn hoøa tan, chuaån bò laø vieäc laøm caàn ñaëc bieät löu yù. Giaáy nhaùm vaø nöôùc coàn coù theå söû duïng ñeå laøm saïch beà maët. Khi söû duïng dung moâi, caàn traùnh nhieät ñeå ngaên khoâng cho chaát keát dính bò khoâ tröôùc khi hai beà maët xaûy ra lieân keát hoùa hoïc hoaøn toaøn. Caùc beà maët ñoái tieáp ñöôïc traûi ñeàu dung moâi. Chaát haøn thöøa ñöôïc nhanh choùng lau saïch.




Trong heä thoáng UPVC, thöïc hieän caùc moái haøn nhieät khi khoâng coù saün caùc thieát bò tieâu chuaån vaø phaûi ñöôïc söï chaáp thuaän cuûa nhaø tö vaán. Kyõ thuaät haøn söû duïng oáng phun khí noùng vaø que haøn PVC chæ ñöôïc thöïc hieän bôûi ngöôøi thôï haøn coù kinh nghieäm trong vieäc saûn xuaát nhöïa. Phaûi ñaûm baûo naáu chaûy hoaøn toaøn baèng caùch haøn töø 3 ñeán 6 ñôït. Khoâng ñöôïc lau moái haøn. Nhaø thaàu phuï baûo haønh vieäc haøn naøy töông töï caùc haïng muïc cuûa nhaø saûn xuaát.

7.8 MOÁI HAØN ÔÛ HEÄ THOÁNG OÁNG ÑOÀNG

Moái haøn vaûy cöùng theo tieâu chuaån BS 1723.

Caùc que haøn phaûi thích hôïp ñoái vôùi caùc vaät tö oáng vaø ñieàu kieän khoâng khí theo tieâu chuaån 1845.

7.9 HEÄ THOÁNG GIAÙ ÑÔÕ OÁNG

Cung caáp heä thoáng giaù ñôõ oáng theo yeâu caàu ñeå laøm giaøn oáng vöõng chaéc. Heä thoáng ñôõ naøy cho pheùp di chuyeån töï do khi giaõn nôû vaø co ruùt vaø seõ ñöôïc phaân loaïi theo caùc möùc yeâu caàu khöû khí vaø thoaùt nöôùc. Khoaûng caùch cuûa oáng ñôõ keå caû oáng thaúng ñöùng vaø naèm ngang khoâng ñöôïc vöôït quaù con soá trung taâm neâu trong baûng sau ñaây. Khoaûng caùch phaûi gaàn baèng vôùi maõ tieâu chuaån töông öùng theo yeâu caàu hay do nhaø saûn xuaát vaät lieäu oáng giôùi thieäu.

Caùc heä thoáng oáng phaûi choáng ñôõ cho nhau ñeå duy trì ñoä thaúng haøng döôùi baát kyø ñieäu kieän naøo (khoâng lôùn 6m trung taâm).

Heä thoáng oáng ñôõ cuõng phaûi tuaân theo tieâu chuaån BS 3974 vaø theo yeâu caàu neâu trong phaàn “Kieåm soaùt tieáng oàn vaø ñoä rung” cuûa Quy phaïm kyõ thuaät naøy.

Caùc heä thoáng oáng ñôõ khoâng ñöôïc ñính keøm ñeå hoã trôï thieát bò

Loaïi oáng Ñöôøng kính danh nghóa (mm)

Troïng taâm ñoái vôùi oáng ñôõ ngang (m)

Troïng taâm ñoái vôùi oáng ñôõ ñöùng (m)

I, II, III ∅15 2.0 2.4

∅20 2.4 3.0

∅25 - ∅32 2.7 3.0

∅40 3.0 3.6

∅50 3.4 3.6

∅65 - ∅80 3.7 4.5

∅100 4.1 4.5

∅125 4.4 4.5

∅150 4.8 4.5

∅200 5.1 4.5

∅250 5.8 4.5

∅300 and above 6.1 4.5


Ngang/ thaúng ñöùng

20oC Ngang/ thaúng ñöùng 70oC

IV ∅15 - ∅20 0.9 / 2.0 0.5 / 2.0




∅25 - ∅32 1.1 / 2.0 0.7 / 2.0

∅40 - ∅80 1.4 / 2.1 0.9 / 2.1

∅100 1.9 / 2.4 1.0 / 2.4

∅150 2.1 / 2.4 1.1 / 2.4

∅200 2.4 / 2.0 1.2 / 2.0


Troïng taâm ñoái vôùi oáng ñôõ ngang (m)

Troïng taâm ñoái vôùi oáng ñôõ ñöùng (m)

V ∅15 - ∅20 1.4 2.0

∅28 - ∅35 1.7 2.4

∅42 - ∅67 2.0 3.0

∅76 2.4 3.6

∅108 and above 2.7 3.6

Neáu coù hai hay nhieàu kích thöôùc oáng, khoaûng caùch heä thoáng ñôõ thoâng thöôøng seõ caên cöù treân soá trung taâm bôûi kích thöôùc heä thoáng oáng nhoû nhaát yeâu caàu.

Oáng döïng thaúng ñöùng seõ ñöôïc baûo veä thích hôïp ôû beä oáng ñöùng ñeå giöõ toång troïng löôïng cuûa noù. Khoâng söû duïng caùc nhaùnh ñeå ñôõ oáng ñöùng.

Caùc heä thoáng oáng ñôõ seõ ñöôïc thieát keá ñeå coù taûi troïng phoái hôïp cuûa caùc oáng, van, thieát bò, caùch ñieän (neáu coù) vaø löu löôïng trong oáng cuõng nhö caùc phaûn öùng do giaõn nôû nhieät hay oáng bò co ruùt.

Caùc van seõ ñöôïc ñaët gaàn vôùi caùc ñieåm ñôõ vaø trong phaïm vi kích thöôùc φ200 vaø ñoái vôùi loaïi lôùn hôn seõ ñöôïc choáng ñôõ rieâng bieät.

Caùc heä thoáng ñôõ coù theå giöõ oáng thaúng haøng vaø tuaân theo moïi quy ñònh vaø caùc yeâu caàu tieâu chuaån.

Caùc oáng treo rieâng bieät coù keïp loaïi hai mieáng hình chöõ U baét buloâng hay vaáu keïp haøn. Tuy nhieân ñoái vôùi caùc kích thöôùc oáng φ 65 hay nhoû hôn, coù theå duøng keïp loaïi hai mieáng hình chöõ U baét buloâng ôû nhöõng vò trí cho pheùp.

Caùc oáng ñeå gaén chaët vaøo heä thoáng ñôõ baèng theùp hay xaây neà phaûi keïp baèng caùc loaïi keïp oáng hoaøn toaøn.

Caùc loaïi keïp phaûi giöõ ñöôïc toaøn boä taûi troïng cuûa oáng cuøng vôùi chaát loûng beân trong, phaàn caùch ñieän, vaønh ñai, van vaø thieát bò. Neáu caàn, ñaëc bieät ñoái vôùi caùc oáng treo φ200 vaø lôùn hôn, khoaûng caùch heä thoáng ñôõ seõ ñöôïc giaûm xuoáng ñeå giaûm taûi troïng trong phaïm vi ñôõ cuûa keïp.

Caùc ñöôøng oáng caùch nhieät phuïc vuï cho vieäc hoaït ñoäng baèng hoaëc nhoû hôn 1000C seõ coù ñeá goã ñaët giöõa keïp vaø oáng. Ñeá goàm khoái goã cheâm ñònh hình ñöôïc saép xeáp ñeå taïo vaønh ñai troøn vôùi cuøng ñoä daøy nhö phaàn caùch ñieän vaø coù chieàu daøi gaàn 100mm ôû caùc caïnh cuûa keïp. Söû duïng sôïi thuûy tinh coù tyû troïng nhieät ñoä cao hay ñeá sôïi len khoaùng ñeå ñun nöôùng hay caùc hoaït ñoäng töông töï treân 1000C. Sôïi thuûy tinh hay ñeá sôïi len khoaùng coù maät ñoä toái thieåu 80kg/ m3.

Tröôøng hôïp oáng caùch nhieät, söï ngöng tuï coù theå xaûy ra ôû thanh treo, vaät tö caùch nhieät ñöôïc nhaø tö vaán pheâ duyeät seõ ñöôïc gaén theâm vaøo giöõa keïp vaø oáng.




Caùc keïp vaø vaønh ñai mieâu taû beân treân seõ ñöôïc gaén chaët vaøo oáng vaø/ hay ñeá caùch nhieät maø khoâng theâm quaù nhieàu öùng suaát vaøo thaønh oáng vaø trong phaàn noái keát naøy, ñaëc bieät löu yù ñoái vôùi loaïi oáng ñoàng.

Dung sai di chuyeån do söï giaõn nôû vaø co ruùt nhieät seõ ôû phöông phaùp ñôõ (chaúng haïn thanh treo hay con laên) vaø khoâng ôû giöõa oáng vaø ñeá hay keïp. Söû duïng thanh treo choáng rung ñeå khoâng bò rung.

Caùc thanh treo vaø caùc thieát bò ñi keøm phaûi laø caùc thanh theùp maï keõm nhuùng noùng coù ñöôøng kính khoâng thaáp hôn nhö sau:

Kích thöôùc oáng (mm) Ñöôøng kính thanh (mm)

Leân ñeán ∅50 (bao goàm) ∅10

∅65 - ∅80 ∅12

∅100 - ∅125 ∅16

∅150 and above ∅20

Neáu khoâng yeâu caàu dung sai cho söï co giaõn hay rung ñoäng, thanh treo coù theå gaén tröïc tieáp vaøo taám saøn, caùc thaønh phaàn caáu truùc hay giaù ñôõ gaén vôùi taám saøn, töôøng hoaëc caùc thaønh phaàn caáu truùc. Caùc oáng coù theå laàn löôït ñöôïc keïp tröïc tieáp vaøo giaù ñôõ gaén vôùi taám saøn, töôøng hay thaønh phaàn caáu truùc.

Neáu hai hay nhieàu oáng chaïy song song vaø gaàn nhau, coù theå ñôõ chuùng töø giaù ñôõ cöùng chöõ C thoâng thöôøng hoaëc loaïi xaø treo ñôõ gaén vôùi taám saøn, thaønh phaàn caáu truùc hay töôøng. Ñoái vôùi caùc loaïi oáng coù kích thöôùc lôùn hôn φ 100, heä thoáng ñôõ phaûi theo tieâu chuaån theùp hình.

Ñoái vôùi caùc oáng laép ñaët döôùi saøn, coù theå söû duïng caùc phaàn chöõ C vôùi mieáng xoáp beân trong hay ñöôïc ñaët vaøo trong taám saøn.

Caùc phaàn chöõ C ñöôïc laép vaø söû duïng theo söï höôùng daãn cuûa nhaø saûn xuaát, ñaëc bieät ñoái vôùi caùc taûi troïng cho pheùp toái thieåu vaø trong nhöõng giôùi haïn öùng suaát cho pheùp.

Cung caáp heä thoáng ñôõ di chuyeån ôû nhöõng nôi maø oáng phaûi di chuyeån do söï co giaõn vaø heä thoáng ñôõ ñöôïc thieát keá cho pheùp söï di chuyeån coù theå toái ña.

Neáu thanh treo ñöôïc söû duïng cho vieäc di chuyeån naøy, ta seõ choïn chuùng theo tyû leä chieàu daøi thanh giöõa caùc truïc ñöùng, ñeán chuyeån ñoäng toái ña cuûa oáng khoâng nhoû hôn 6:1

Caùc thanh treo söû duïng cho vieäc di chuyeån kieåu coät choáng seõ ñöôïc cung caáp vôùi mieáng ñeäm loaïi chöõ “u” coù kích thöôùc treân kích thöôùc loã cho thanh. Töông töï, caùc moùc hình chöõ U hay vaáu keïp haøn treân keïp oáng coù kích thöôùc treân kích thöôùc loã cho thanh. Thanh seõ ñöôïc sieát chaët ôû caû hai ñaàu vôùi caùc voøng ñeäm hình caàu vaø ñai oác sieát. Khoâng söû duïng ñai oác ôû baát cöù phaàn naøo cuûa thanh giöõa mieáng ñeäm vaø moùc hình chöõ U hay vaáu keïp haøn.

Khi tyû leä chieàu daøi thanh giöõa caùc truïc ñöùng, ñeán vieäc di chuyeån toái ña cuûa oáng vöôït quaù 12:1, coù theå söû duïng voøng ñeäm phaúng thay vì voøng ñeäm hình caàu.




Neáu khoâng theå cung caáp ñuû chieàu daøi thanh treo ñeå coù ñoä di chuyeån toái ña cuûa oáng vaø vieäc di chuyeån nhoû hôn 250 töø ñoä laéc thaúng ñöùng, thì söû duïng loø xo vaø thanh treo coù ñoä voõng gaáp ñoâi.

Neáu ñoä di chuyeån cuûa oáng roäng do nhieät ñoä hoaït ñoäng cao, mieáng ñeäm chöõ C cöùng hay heä thoáng thanh treo coù theå ñöôïc söû duïng vôùi truïc laên hay caùc mieáng tröôït P.T.F.E ñaëc bieät ñeå giuùp oáng di chuyeån.

Neáu truïc laên hay heä thoáng tröôït yeâu caàu söû duïng cho oáng caùch nhieät, phaàn caùch nhieät phaûi cöùng cho toái thieåu ñöôøng kính boán oáng vaø lôùp boïc ngoaøi phaûi baèng theùp maï keõm taïo thaønh moät oáng boïc ngoaøi ñeå ñôõ cho heä thoáng oáng beân trong vaø baûo veä söï caùch nhieät khi di chuyeån.

Caùc oáng ñaët trong phoøng maùy vaø gaàn nhöõng choã ñaët maùy, neáu ñoä rung töø maùy coù theå truyeàn qua oáng, caàn phaûi hoã trôï cho oáng theâm caùc thanh treo choáng rung nhö ñaõ neâu trong phaàn “Ñieàu khieån tieáng oàn vaø ñoä rung”.

Caùc oáng saét coù mieáng ñeäm baèng saét vaø oáng ñoàng seõ coù mieáng ñeäm baèng ñoàng hay kim loaïi.

Cuõng caàn cung caáp theâm heä thoáng ñôõ gaàn nhöõng nôi ñaët van vaø töông töï, caùc haïng muïc ñuùc ñeå traùnh öùng suaát quaù möùc treân heä thoáng oáng tieáp giaùp. Cuõng cung caáp theâm heä thoáng ñôõ gaàn khu vöïc noái maùy bôm ñeå traùnh öùng suaát quaù möùc ôû maùy.

Nhaø thaàu phuï seõ chòu traùch nhieäm laép ñaët caùc heä thoáng ñôõ naøy, söû duïng “buloâng ñaàu ñoû Philip”, laép cho beâtoâng, caét vaø xaây caùc mieáng ñeäm baèng gaïch vaø töông töï. Neáu khoâng theå gaén caùc buloâng tröïc tieáp treân oáng ñeå ñôõ vaø söû duïng caùc goùc giaù chìa treân oáng neáu coù yeâu caàu.

Tröø khi ñaõ ñöôïc ñònh roõ, caùc heä thoáng ñôõ cho oáng saét seõ nhö sau:

Vò trí Mieáng ñeäm, truï ñôõ vaø thanh treo

Vò trí beân ngoaøi Maï keõm nhuùng noùng theo tieâu chuaån BS 729 vaø lôùp phuû beân ngoaøi toái thieåu 85μm vaø sôn lôùp baûo veä epoxy

Vò trí beân ngoaøi Theùp maï keõm nhuùng noùng theo tieâu chuaån BS 729 vaø lôùp phuû beân ngoaøi toái thieåu 85μm ñöôïc sôn loùt vaø sôn

Tieán haønh sôn theo mieâu taû trong phaàn “Sôn, daùn nhaõn vaø hoaøn thieän” cuûa phaàn thoâng soá kyõ thuaät. Caùc mieáng ñeäm phaûi ñöôïc gaén baèng buloâng vaø ñai oác hay ñinh vít ñöôïc maï ñieän vôùi keõm hay cadmi theo tieâu chuaån BS3382 phaàn 1 vaø 2 coù ñoä daøy toái thieåu 25μm.

Caùc oáng ñoàng thaúng ñöùng seõ ñuôïc gaén baèng caùc voøng keïp baèng ñoàng hay hôïp kim ñoàng hoaëc maãu mieáng ñeäm oáng ñöôïc nhaø tö vaán pheâ duyeät. Caùc oáng ngang seõ ñöôïc gaén vôùi mieáng ñeäm hoaëc thanh treo baèng ñoàng laøm vieäc naëng hay hôïp kim ñoàng. Heä thoáng ñôõ cho caùc oáng ngang seõ laø caùc voøng oáng loaïi cheû vaø caùc chi tieát ñöôïc ñeä trình leân nhaø tö vaán ñeå pheâ duyeät.

Caùc oáng ñôõ UPVC baèng theùp khoâng gæ vôùi lôùp phuû nhöïa.

Heä thoáng oáng ñöôïc laép thaúng ñöùng hay baèng phaúng tröø khi ñöôïc ñònh roõ trong phaàn Quy phaïm kyõ thuaät vaø baûn veõ, ñoàng thôøi laøm saïch caùc beà maët gaàn beân.




Caùc oáng ñöôïc ñôõ moät caùch ñuùng ñaén vaø vöõng chaéc baèng caùc thanh treo, mieáng ñeäm, keïp ñöôïc chaáp thuaän hay heä thoáng ñôõ ñöôïc thieát keá ñaùp öùng yeâu caàu caàu taïi töøng ñieåm ñôõ.

Heä thoáng oáng ñöôïc taäp hôïp laïi moät caùch goïn gaøng trong caùc giaù khung theùp ñöôïc saép xeáp sao cho soá oáng chaïy cheùo nhau laø toái thieåu vôùi caùc khoaûng thích hôïp cho moïi di chuyeån, giaõn nôû vaø co ruùt.

Caùc loaïi oáng vaø thieát bò khoâng baèng saét coù phaàn khoâng daãn ñieän taïi caùc phaàn ñôõ baèng saét

Oáng mao daãn seõ ñöôïc keïp vaøo caùc oáng lôùn hay vaùn loùt baèng theùp ôû 450mm trung taâm.

7.10 MOÁI NOÁI OÁNG MEÀM VAØ GIAÕN NÔÛ

Heä thoáng oáng seõ ñöôïc laép ñaët vôùi ñoä uoán vaø ñoä linh ñoäng thích hôïp ñeå traùnh truyeàn rung ñoäng töø caùc thieát bò ñöôïc noái keát ñeán caáu truùc xung quanh maø khoâng caàn phaûi coù caùc moái noái meàm. Neáu khoâng theå thöïc hieän ñöôïc, vaø trong tröôøng hôïp neáu oáng ñöôïc noái vôùi caùc thieát bò nhö maùy laïnh trung taâm, maùy bôm hay caùc thieát bò xöû lyù khoâng khí, söû duïng caùc moái noái oáng meàm theo tieâu chuaån ñöôïc söï chaáp thuaän cuûa nhaø tö vaán. Nhöõng moái noái meàm naøy seõ trong phaïm vi kích thöôùc, laøm baèng khung nylon vôùi caùc voøng ñeäm gia cöôøng daây vaø ñeäm loùt ñöôïc thieát keá thích hôïp cho vieäc truyeàn chaát loûng vaø öùng suaát soác vaø laøm vieäc qua nhieàu heä thoáng.

Nhaø thaàu phuï seõ cung caáp vaø laép ñaët caùc moái noái giaõn nôû baèng theùp khoâng gæ 316 taïi caùc oáng ñöùng vaø ngang 35m ñeå haáp thuï ñoä giaõn nôû/ co ruùt nhieät cuûa oáng. Kieåu daùng vaø vò trí cuûa nhöõng moái noái giaõn nôû seõ ñöôïc ñeä trình cho nhaø tö vaán ñeå pheâ duyeät tröôùc khi laép ñaët.

Neáu ñöôøng oáng chaïy qua ñieåm noái giaûn nôû xaây döïng, moái noái giaõn nôû beân döôùi seõ ñöôïc cung caáp.

Maáu neo cöùng seõ ñöôïc cung caáp taïi nhöõng vò trí ñöôïc thieát keá ñeå phaân boå thích hôïp ñoä giaûn nôû vaø öùng suaát. Caùc moái noái giaõn nôû seõ ñöôïc taïo öùng suaát tröôùc ñeå giaûm öùng suaát giaõn nôû trong ñieàu kieän laøm vieäc, khoaûng roäng co laïnh theo söï giôùi thieäu cuûa nhaø saûn xuaát.

Phaàn öùng suaát caùch ñieän hay nhöõng phaàn khaùc ñöôïc pheâ duyeät seõ ñöôïc cung caáp ñeå traùnh ñoä giaõn daøi quaù möùc.

Caùc maáu neo vaø thanh daãn seõ ñöôïc cung caáp theo söï giôùi thieäu cuûa nhaø saûn xuaát caùc moái noái giaõn nôû vaø moái noái meàm ñöôïc söï chaáp thuaän cuûa nhaø tö vaán.

7.11 MIEÁNG CHAËN

Caùc moái noái neo seõ ñöôïc cung caáp ôû nhöõng nôi caàn thieát duø coù ñöôïc theå hieän treân baûn veõ hay khoâng vaø seõ ñöôïc laøm baèng saét hình chöõ C sieát chaët vaøo caáu truùc xaây döïng. Nhaø thaàu phuï seõ cung caáp vaø laép ñaët caùc mieáng cheâm, mieáng ñeäm vaø caáu truùc theùp maø moái noái neo yeâu caàu.




Moái noái neo ñöôïc ñaët keát hôïp vôùi ñöôøng oáng thay ñoåi höôùng ñeå haáp thuï öùng suaát do ñoä giaõn nôû ñöôøng oáng vaø öùng suaát trong bôûi caùc löïc truyeàn ñeán maët ñaát hay caáu truùc ôû nhöõng moái noái thích hôïp. Moái noái neo seõ coù ñoä bean thích hôïp ñeå chòu ñöôïc taûi troïng toái ña.

Cung caáp ñoä voõng chaân vòt cho caùc truï oáng vaø phaàn truï oáng bôm huùt/ xaû .

Nhaø thaàu phuï seõ ñaëc bieät löu yù raèng ngoaøi muïc ñích giöõ ñöôøng oáng, maáu neo coøn ñöôïc söû duïng ñeå kieåm tra heä thoáng oáng vaø luùc ñoù, caàn phaûi kieåm tra caùc ñaàu cuoái cuûa oáng chính coù caùc maáu neo giöõ ñeå traùnh caùc ñöôøng oáng bò keùo sang moät beân do öùng suaát chaën ôû hai ñaàu cuoái cuûa oáng.

Chi tieát vaø kích thöôùc cuûa mieáng chaën vaø maáu neo seõ ñöôïc ñeä trình cho nhaø tö vaán pheâ duyeät. Khoâng ñöôïc gaén maáu neo vaøo baát cöù phaàn naøo cuûa caáu truùc xaây döïng cho ñeán khi nhaän ñöôïc söï pheâ duyeät hoaøn toaøn veà vò trí vaø phöông phaùp gaén maáu neo.

Trong caùc oáng theùp, maáu neo seõ ñöôïc haøn hoaøn toaøn vaøo oáng tröø khi coù söï höôùng daãn khaùc trong baûn veõ.

Trong caùc oáng ñoàng, maáu neo bao goàm maët bích baèng ñoàng hay keïp ñöôïc haøn vaûy cöùng hoaøn toaøn vaøo oáng vaø baég ví vaøo taám maáu neo baèng theùp meàm maï keõm vôùi caùc voøng ñeäm khoâng daãn ñieän ñöôïc chaáp thuaän vaø caùc oáng loùt ñeå caùch ñieän caùc vaät tö khaùc vaø traùnh taùc ñoäng ñieän phaân.

Caùc maáu neo seõ ñöôïc thieát keá sao cho caùc moái haøn khi di chuyeån khoâng bò voõng xuoáng vaø ñöôïc gaén vôùi caáu truùc xaây döïng ôû vò trí vaø caùch thöùc traùnh gaây hö hoûng cho caáu truùc maø chuùng ñöôïc gaén vaøo.

Khoâng coù moái noái neo naøo trong phaïm vi 600mm töø baát cöù moáii haøn naøo.

Ñoái vôùi caùc oáng döôùi ñaát, ñoä voõng vaø xaø chöõ T ñöôïc taïo thaønh vôùi caùc moái noái meàm, caùc taám chaën baèng beâ toâng seõ do nhaø thaàu chính xaây döïng.

Ngoaøi nhöõng öùng suaát hoaït ñoäng thoâng thöôøng cuûa heä thoáng, nhöõng taám chaën naøy seõ choáng laïi öùng suaát trong do khi ñoùng van gaây ra vaø seõ coù kích thöôùc töông öùng.

Ngoaøi caùc taám chaën neâu treân, khoái maáu neo seõ ñöôïc ñaët ôû nhöõng khoaûng nghæ treân chieàu daøi thaúng cuûa oáng nhö khoaûng caùch giöõa baát kyø taám chaën naøo hay maáu neo naøo khoâng ñöôïc quaù 30m.

Trong phaàn noái naøy, nhaø thaàu phuï seõ ñaëc bieät löu yù ngoaøi muïc ñích giöõ ñöôøng oáng, taám chaën seõ ñöôïc duøng ñeå kieåm tra ñöôøng oáng, nghóa laø trong quaù trình kieåm tra ñöôøng oáng chính döôùi ñaát, caàn phaûi kieåm tra caùc ñaàu cuoái cuûa oáng chính giöõ maáu noái neo ñeå ngaên ñöôøng oáng höôùng ra moät beân do öùng suaát chaën söû duïng ôû hai ñaàu oáng.

Nhaø thaàu phuï seõ ñeä trình chi tieát vaø kích thöôùc cuûa mieáng chaën trong khoái maáu neo ñeå pheâ duyeät.

7.12 THANH DAÃN

Caùc thanh daãn coù truï ñöùng baèng theùp meàm haøn vaøo caùc oáng treân truïc laên hay heä thoáng ñôõ tröôït P.T.F.E giöõ buloâng chöõ U treân caùc mieáng ñeäm hay nhö ñöôïc theå hieän chi tieát treân baûn veõ.




Thanh daãn coù theå ñieàu chænh ñöôïc ôû caû hai höôùng trong maët phaúng beân ñeå ñöôøng oáng ñöôïc saép xeáp chính xaùc.

Thanh daãn khoâng ñöôïc nhoû hôn 2 laàn ñöôøng kính oáng.

Thanh daãn ñaàu tieân khoâng ôû xa hôn 4 laàn ñöôøng kính oáng töø caùc moái noái giaõn nôû lieàn keà hay moái noái oáng meàm. Thanh daãn thöù hai khoâng xa hôn thanh daãn thöù nhaát 14 laàn ñöôøng kính oáng.

7.13 ÑOÄ DOÁC ÑÖÔØNG OÁNG

Caùc heä thoáng oáng nöôùc ñöôïc laép ñaët vôùi ñoä doác höôùng leân treân lieân tuïc theo höôùng chaûy töø ñieåm baét ñaàu chaûy ngang ñeán ñieåm cuoái laø thuøng chöùa hay bình chöùa töông öùng, hoaëc ñöôïc thoâng khí töï ñoäng.

7.14 XAÛ KHÍ

Van xaû khí töï ñoäng coù kích thöôùc thích hôïp vaø ñöôïc nhaø tö vaán chaáp thuaän seõ ñöôïc cung caáp taïi nhöõng vò trí cao trong ñöôøng oáng nöôùc löu thoâng vaø baát cöù phaàn naøo maø coù theå laáy khoâng khí. Ñieåm ñaët van laø caùc phaàn oáng daøi 800mm vôùi ñöôøng kính 25mm nhoû hôn ñöôøng oáng φ 80 neâu treân vaø baèng vôùi kích thöôùc oáng cho oáng döôùi φ50.

Neáu caùc ñieåm naøy khoâng vôùi ñeán ñöôïc, caùc loã thoâng khí vôùi oáng thoâng ñeán ñieåm coù theå.

Moãi van cuøng vôùi van khoùa vaø oáng thaûi ñöôïc noái ñeán ñieåm thoaùt gaàn.

Van xaû khí töï ñoäng cho oáng coù kích côõ ñeán ∅400 seõ laø loaïi phun ñôn, thaân gang vôùi phao nhöïa.

Van xaû khí töï ñoäng cho oáng coù kích côõ lôùn hôn ∅400 seõ laø loaïi phun ñoâi, thaân gang vôùi phao nhöïa.

Van xaû khí töï ñoäng seõ coù kích thöôùc phuø hôïp vôùi coâng suaát cuûa heä thoáng ñeå coù theå xaû khí heát trong voøng 1 giôø

Caùc maët bích ñöôïc khoan vaø tuaân theo tieâu chuaån BS 4504.

7.15 ÑIEÅM THOAÙT

Caùc van xaû coù kích thöôùc thích hôïp seõ ñöôïc cung caáp taïi caùc ñieåm thaáp treân oáng hay nhö trong baûn veõ cho pheùp heä thoáng oáng xaû heát nöôùc hoaøn toaøn.

Van thoaùt toái thieåu φ20 ñoái vôùi oáng coù φ50 vaø φ32 cho oáng lôùn hôn, caùc van ñeàu coù voøi noái.

Caùc khay höùng nöôùc döôùi thieát bò maø nöôùc coù theå chaûy vaøo trong quaù trình hoaït ñoäng bình thöôøng seõ ñöôïc thoaùt ra qua oáng toái thieåu φ25 hay lôùn hôn thích hôïp vôùi heä thoáng. Nöôùc khoâng ñöôïc pheùp chaûy xuoáng hay ñoïng laïi trong caáu truùc cuûa toøa nhaø.

Caùc phaàn cuûa thieát bò vaø caùc phaàn phuï thuoäc cuõng nhö caùc thieát bò nhö thuøng chöùa, thieát bò loïc, tuùi thu buïi vaø caùc thieát bò töông töï seõ ñöôïc cung caáp vôùi caùc thieát bò thoaùt nöôùc seõ chaûy gaàn saøn hay vò trí thoaùt vaø ñöôïc cung caáp vôùi khôùp noái ren ñeå deã daøng veä sinh.




Toaøn boä kích thöôùc cuûa xaû caën vôùi van coång vaø oáng noái meàm ñöôïc laép vaøo caùc heä thoáng nöôùc. Van khoâng ñöôïc nhoû hôn φ 32 ñoái vôùi ñöôøng oáng treân φ50 vaø khoâng nhoû hôn φ20 ñoái vôùi ñöôøng oáng nhoû hôn φ50. Xaû caën ñöôïc gaén ôû ñieåm thaáp nhaát cuûa caùc ñöôøng oáng thaúng ñöùng ñeå pheùp xaû nöôùc vaø laøm veä sinh.

Caùc ñaàu ra oáng daãn vaø van xaû khí coù theå nhìn thaáy ñöôïc vaø chaûy vaøo gaøu ñoàng ñeå coù theå theo doõi söï roø ræ.

Ñoä doác cuûa caùc ñöôøng oáng khoâng nhoû hôn 1:500 vaø oáng thoaùt khoâng nhoû hôn 1:00 vaø ñöôïc saép xeáp ñeå thoaùt nöôùc ñeán möùc toái thieåu ôû caùc ñieåm thaáp.

7.16 VAN

Van ñöôïc cung caáp ôû nhöõng vò trí theo nhö treân baûn veõ. Van phaûi tuaân theo tieâu chuaån vaø phaûi ñaït BS Kite.

Van caùch ly ñöôïc cung caáp cho caùc oáng noái ñeán maùy vaø truïc ñöùng ñeå deã daøng baûo trì maø khoâng phaûi thoaùt nöôùc ñöôøng oáng.

Van ñieàu chænh ñöôïc cung caáp ôû nhöõng moái noái thieát bò ñeå deã daøng caân baèng.

Taát caû caùc van phaûi phuø hôïp vôùi aùp suaát laøm vieäc, nhieät ñoä vaø thaønh phaàn hoùa hoïc cuûa chaát loûng tieáp xuùc vôùi caùc phaàn vaø ñöôïc laép ñaët vôùi chaân van thöïc söï thaúng ñöùng hay naèm ngang.

Taát caû caùc van ñöôïc ñaët töø 2000mm trôû leân cao treân saøn seõ coù day xích chuyeån xuoáng cao ñoä 1000mm treân saøn.

Kích thöôùc cuûa caùc van töï ñoäng vaø thieát bò seõ ñöôïc choïn löïa nghieâm ngaët theo söï chæ daãn cuûa nhaø saûn xuaát.

Kieåu thieát keá cuûa van phaûi ñöôïc chaáp thuaän vaø ñöôïc saûn xuaát theo tieâu chuaån BS 5150 vaø BS 5154.

Van cho caùc hoaït ñoäng vaø coâng suaát töông töï coù theå trao ñoåi ñöôïc cho nhau qua heä thoáng.

Caùc van coù noøng φ65 trôû leân seõ coù caùc maët bích theo baûn BS 4504 phaàn 1.

Caùc van coù muõi teân chæ chieàu ñoùng vaø môû ôû nôi coù theå vaø coù tay caàm hoaït ñoäng ñoùng theo chieàu kim ñoàng hoà.

Caùc van phaûi coù nhöõng thoâng tin sau:

● Teân nhaø saûn xuaát ● AÙp suaát kieåm tra ● Kích côõ

Caùc van vaän haønh baèng tay coù baùnh raêng hoaït ñoäng sao cho ta coù theå môû hay ñoùng van ôû khoaûng 15%. Neáu khoâng theå ñaït ñöôïc, nhöõng loaïi van nhö vaäy seõ ñöôïc gaén vôùi ñöôøng oáng ñi voøng.

Kieåu thieát keá cuûa töøng loaïi van ñöôïc gaén thöû moät laàn, sau ñoù thaùo ra ñeå baûo trì maø khoâng laøm caûn trôû ñöôøng oáng hay laøm hö van.

ÔÛ nhöõng choã cho pheùp, van töï ñoäng ñöôïc gaén vaøo truïc quay trong maët phaúng naèm ngang.




Van töï ñoäng hoaït ñoäng bôûi boä daãn ñoäng baèng ñieän coù boä phaän daãn ñoäng baèng tay caøi vaøo cô caáu khôûi ñoäng, nhôø ñoù coù theå ñieàu chænh baèng tay khi cuùp ñieän. Cuõng coù theå khôûi ñoäng van baèng caùch baät nuùt ñieàu khieån “ñoùng” vaø “môû”. Boä daãn ñoäng cuõng keát hôïp vôùi ñoäng cô baûo veä taûi troïng, kim chæ vò trí; coâng taéc giôùi haïn coù theå ñöôïc baét sau taám baûng ñieàu khieån hay ôû nhöõng vò trí khaùc. Thôøi gian ñoùng toái ña cuûa naêng suaát ñoäng cô truyeàn ñoäng vaø baùnh raêng cô khoâng quaù 60 giaây.

Van töï ñoäng hoaït ñoäng baèng boä daãn ñoäng khí söû duïng loø xo boä daãn ñoäng pittoâng ñeå ñoùng van trong öùng suaát khí. Boä daãn ñoäng keát hôïp vôùi kim chæ vò trí van vaø seõ phuø hôïp vôùi vieäc ñieàu khieån öùng suaát khí leân ñeán 560kPa.

Naép van coù kích thöôùc phuû cho pheùp vaøo trong vò trí van khi van hoaøn toaøn môû.

Van moät chieàu trong bôm xaû ñöôïc gaén treân maët phaúng naèm ngang ôû nôi naøo coù theå vaø ñöôïc thieát keá ngaét nhanh maø khoâng bò soác. Neáu caàn thieát, do khoaûng caùch giôùi haïn, van ñöôïc gaén vaøo maët phaúng thaúng ñöùng, nhaø thaàu phuï seõ xaùc nhaän thoûa thuaän vôùi nhaø saûn xuaát phöông phaùp aùp duïng naøy.

Van phao bi coù kieåu “caân baèng” hay töông ñöông ñöôïc nhaø tö vaán chaáp thuaän, tröø khi trong baûn veõ xaùc ñònh khaùc. Thaân van laøm baèng gang vôùi hôïp kim niken vaø caùc phaàn hoaït ñoäng baèng theùp khoâng gæ vaø coù phao ñoàng traùng thieác. Van bi noåi trong nöôùc maën ñöôïc laøm baèng vaät lieäu thích hôïp ñöôïc söï pheâ duyeät cuûa nhaø tö vaán vaø laø loaïi ngaét chaäm mieãn laø phao baèng ñoàng phuû lôùp neoprene.

Van giaûm öùng suaát, van nhaû öùng suaát, thieát bò ngaét chaân khoâng, van solenoid vaø van ñoäng cô seõ ñöôïc cung caáp theo yeâu caàu duø coù theå hieän treân baûn veõ hay khoâng.

Van ñieàu chænh keùp giuùp vieäc ñieàu chænh keùp ñöôïc chính xaùc, hoaøn thieän vôùi thieát bò ño vaø hieån thò löu löôïng, caùch ly vaø thoaùt nöôùc. Moái quan heä giöõa aùp suaát vaø löu löôïng nöôùc taïi möùc ñoä caøi ñaët tröôùc khaùc nhau theå hieän trong bieåu ñoà löu löôïng vôùi ñoä chính xaùc ± 5%. Khi hoaøn taát coâng vieäc, moät thieát bò kieåm tra löu löôïng nöôùc môùi ñoái vôùi van ñieàu chænh keùp seõ ñöôïc baøn giao laïi cho khaùch haøng.

Tieán trình laép van:

Van caàu vaø van coång kích thöôùc φ 12 ñeán φ 50 cho nöôùc caáp vaø nöôùc laïnh

Tieâu chuaån BS 5154

Loaïi Thaân khoâng naâng coù ñinh vít beân trong ñoái vôùi van coång, thaân naâng ñoái vôùi van caàu

Thaân vaø naép ñaäy Hôïp kim ñuùc suùng theo tieâu chuaån BS 1400 LG2, noái ren

Thaønh Ñoàng thau chòu löïc hay hôïp kim

Gôø Hôïp kim theo tieâu chuaån BS 1400 LG2

Van coång kích thöôùc φ 65 trôû leân cho nöôùc caáp vaø nöôùc laïnh


Loaïi Thaân khoâng naâng coù ñinh vít beân trong

Thaân vaø naép ñaäy Gang (leân ñeán 16 bar), theùp ñuùc (leân ñeán 40 bar), maët bích

Thaønh Ñoàng thau chòu löïc/ theùp khoâng gæ




Gôø Mieáng cheâm gang, gôø ñoàng

Van caàu kích thöôùc φ 65 trôû leân cho nöôùc caáp vaø nöôùc laïnh


Loaïi Thaân naâng coù ñinh vít beân ngoaøi

Thaân vaø naép ñaäy Gang (leân ñeán 16 bar), theùp ñuùc (leân ñeán 40 bar)

Thaønh Ñoàng thau söùc caêng cao/ theùp khoâng gæ

Gôø Ñóa gang, gôø ñoàng

Van böôùm kích thöôùc φ75 trôû leân cho nöôùc caáp vaø nöôùc laïnh


Loaïi Thaân xoáp coù maët töông thích vôùi ñöôøng oáng maët bích mô

Thaân Gang hay saét meàm

Ñóa Saét meàm phuû epoxy

Thaønh Theùp khoâng gæ 316

Ñeá Cao su nhaân taïo N (cao su nitrile) hay EPDM

Boä daãn ñoäng Baùnh vít (cho kích thöôùc φ 100 trôû leân) vôùi tay vòn vaø kim chæ vò trí

Löu yù: Van tieát löu ñöôïc laép ñaët trong oáng caùch ñieän coù coå môû roäng ñeå laøm veä sinh phaàn caùch ñieän toái thieåu 25mm. Phaàn ngaén cuoái coù bích seõ ñöôïc cung caáp ñeå thuaän lôïi cho vieäc thaùo dôõ sau naøy

Van moät chieàu kích thöôùc φ12 ñeán φ50 cho nöôùc caáp vaø nöôùc laïnh


Loaïi Caùnh

Vaät lieäu Hôïp kim ñuùc suùng theo tieâu chuaån BS1400 LG2

Thaønh Ñoàng thau söùc caêng cao hay hôïp kim ñuùc suùng

Gôø Hôïp kim ñuùc suùng theo tieâu chuaån BS 1400 LG2

Van moät chieàu kích thöôùc φ50 trôû leân cho nöôùc caáp vaø nöôùc laïnh

Tieâu chuaån BS 5154 ñöôøng kính theo tieâu chuaån ISo 5752

Loaïi Van moät chieàu loø xo trong phaàn thaân xoáp vôùi caùc maët töông thích vôùi ñöôøng oáng maët bích môø

Thaân Thaân baèng saét meàm hoaøn toaøn trong phaàn cao su ñaøn hoài ñöôïc neùn ñeå traùnh bò nöôùc chaûy laøm moøn

Taám/ truïc leäch taâm Theùp meàm vôùi loø xo keùp theo tieâu chuaån SS316/ SS316

Ñeá Cao su N

Löu yù: Phaàn ngaén cuoái coù bích seõ ñöôïc cung caáp ñeå thuaän lôïi cho vieäc thaùo dôõ van

Van ñieàu chænh keùp kích thöôùc leân ñeán φ50 cho nöôùc caáp vaø nöôùc laïnh




Tieâu chuaån BS 7350 vaø BS 5154

Loaïi Thaønh truïc ñöùng

Thaân vaø naép Baèng ñoàng, baét vít vaø ren theo tieâu chuaån BS 21

Thaân Kim loaïi DZR

Ñóa Hôïp kim ñuùc suùng hay hôïp kim ñoàng

Löu yù:

Ñieàu chænh keùp chính xaùc vôùi kim chæ.

Moái quan heä aùp suaát vaø löu löôïng nöôùc taïi möùc caøi ñaët tröôùc khaùc nhau ñöôïc ñoïc trong bieåu ñoà löu löôïng. Moät khi ñöôïc caøi ñaët, vò trí ñieàu chænh seõ coá ñònh.

Van ñöôïc hoaøn thieän vôùi thieát bò ño aùp suaát nhoû gioït xaây saün vaø van thoaùt.




Van ñieàu chænh keùp kích thöôùc töø φ 65 ñeán φ 300 cho nöôùc caáp vaø nöôùc laïnh

Tieâu chuaån BS 7350 vaø BS 5152

Loaïi Thaønh naâng

Thaân vaø naép Gang theo tieâu chuaån BS 1452 loaïi 220 (leân ñeán 16 bar), ñaàu cuoái coù bích

Ñóa Hôïp kim ñuùc suùng hay gang vôùi ñóa maët troøn baèng hôïp kim ñuùc suùng

Voøng ñeá thaân Ñoàng thieác hay hôïp kim ñuùc suùng

Thaønh Ñoàng thau hay thieác nhoâm

Löu yù: Van ñöôïc hoaøn thieän vôùi thieát bò ño aùp suaát nhoû gioït xaây saün vaø van thoaùt

Van coång vaø van caàu cho ñöôøng oáng loaïi V

Tieâu chuaån UPVC theo tieâu chuaån BS 5156

Van coång vaø van caàu cho heä thoáng xöû lyù nöôùc vaø ñöôøng oáng khöû truøng baèng clo

7.17 MAÙY ÑO LÖU LÖÔÏNG VAØ ÑOÀNG HOÀ ÑO

Maùy ño löu löôïng, thieát bò ño aùp suaát, nhieät keá vaø hoäp caûm bieán seõ ñöôïc cung caáp nhö ñaõ neâu trong baûn veõ hay theå hieän trong Quy phaïm kyõ thuaät naøy cho vieäc chuyeån giao chính xaùc cuûa heä thoáng. Nhöõng thieát bò naøy thích hôïp theo dung sai ñöôïc quy ñònh trong phaàn “Chuyeån giao, kieåm tra, baûo trì vaø dòch vuï” cuûa Quy phaïm kyõ thuaät naøy.

Hoäp nhieät keá thích hôïp cho caû caùc boùng ñeøn ñieàu nhieät töø xa hay nhieät keá thuûy ngaân seõ ñuôïc cung caáp ôû nhöõng nôi treân baûn veõ vaø taïi ñaàu vaøo vaø ñaàu ra cuûa caùc thieát bò truyeàn nhieät.

Cung caáp thieát bò ño aùp suaát ôû caùc beân huùt vaø ñaåy cuûa moãi maùy bôm, ôû phaàn noái ñaàu vaøo cuûa caùc thieát bò noái vôùi heä thoáng oáng vaø nhöõng nôi khaùc theå hieän treân baûn veõ.

Nhieät keá vaø thieát bò ño aùp suaát laø loaïi coù maët ñoàng hoà 100mm, maët bích ñöôïc laép vaø ñöôïc choïn sao cho ñieåm hay phaïm vi hoaït ñoäng thoâng thöôøng gaàn ñeán vaïch giöõa caân.

Caùc thieát bò ño coù kim maøu ñoû ñeå chæ ñieåm caøi ñaët vaø van hoaït ñoäng thoâng thöôøng.

Nhieät keá thuûy ngaân trong khung theùp vaø thieát bò ño aùp suaát kieåu oáng buoâñoâng vaø tuaân theo tieâu chuaån BS 1780 phaàn 2. Thieát bò ño aùp suaát ñöôïc laép vôùi oáng xiphoâng vaø van löu löôïng.

Neáu coù yeâu caàu ghi cheùp laïi nhieät ñoä vaø/ hay aùp suaát, nhöõng thieát bò nhö vaäy seõ ñaùp öùng nhöõng yeâu caàu ñöôïc mieâu taû trong Quy phaïm kyõ thuaät vaø baûn veõ.

Caùc thieát bò ño ñöôïc chaáp thuaän seõ ñöôïc cung caáp neáu coù yeâu caàu vaø ñöôïc theå hieän trong baûn veõ. Nhöõng thieát bò ño naøy coù theå ño dung löôïng döôùi moïi ñieàu kieän hoaït ñoäng vôùi söï thaát thoaùt aùp suaát toái thieåu theo tieâu chuaån Anh töông öùng.




Thieát bò ño löu löôïng ñeå ño löu löôïng cuûa caùc heä thoáng khaùc nhau seõ ñöôïc gaén vaøo ñöôøng oáng theo söï ñeà nghò cuûa nhaø saûn xuaát ñeå löu löôïng khoâng bò aûnh höôûng bôûi nhöõng thay ñoåi hoaït ñoäng cuûa thieát bò chaûy veà hay ñi . Ngoaøi ra nhaø thaàu phuï coøn cung caáp theâm moät maùy höôùng doøng chaûy thaúng neáu coù yeâu caàu.

Hoäp cho nhieät keá vaø cho nhöõng muïc ñích töông töï ñöôïc ñaët ôû nhöõng nôi khoâng laøm aûnh höôûng xaáu ñeán ñieàu kieän löu löôïng.

Caùc hoäp trong ñöôøng oáng theùp laø loaïi baèng theùp khoâng gæ thaùo raùp ñöôïc (noái ren) ñöôïc gaén vaøo trong caùc vaáu loài baét vít ñöôïc haøn vaøo oáng.

Caùc hoäp trong ñöôøng oáng ñoàng laø loaïi oáng ñoàng vôùi ñaàu cuoái troáng vaø hoäp ñöôïc haøn vaûy cöùng vaøo oáng ñoàng.

Caùc hoäp noái phaûi ôû xa trong oáng ñeå coù theå ñoïc ñöôïc vaø hoaøn thieän vôùi chaát loûng daãn nhieät coù ñoä saâu toái thieåu 50mm vaø ñöôïc ñaäy naép laïi.

Ñoái vôùi nhöõng oáng nhoû hôn 65mm seõ ñöôïc nôùi roäng ñeå vöøa vaën vôùi hoäp maø khoâng bò thaát thoaùt löu löôïng. Caùc hoäp ñöôïc ñaët thaúng ñöùng hay ôû moät goùc ñeå giöõ chaát loûng daãn nhieät.

Vaáu loài cho caùc thieát bò ño aùp suaát vaø muïc ñích töông töï seõ laø kieåu baét vít tieâu chuaån beân trong, ñöôïc haøn hay haøn vaûy cöùng ôû goùc beân phaûi ñeán oáng vaø coù kích thöôùc theo yeâu caàu cuûa töøng öùng duïng. Chieàu daøi vaø ñöôøng kính ngoaøi cuûa vaáu loài oáng toái thieåu baèng vôùi kích thöôùc cuûa oáng.

Caùc thieát bò ño trong bôm vaø maùy laøm nguoäi vaø nhöõng thieát bò töông töï seõ ñöôïc laép ñaët goïn gaøng trong caùc taám kim loaïi baèng theùp khoâng gæ hay caùc baûn baèng goã cöùng ñeå pheâ chuaån.

7.18 ÑIEÅM KIEÅM TRA AÙP SUAÁT/ NHIEÄT ÑOÄ CHUNG

Ñieåm kieåm tra aùp suaát/ nhieät ñoä chung seõ ñöôïc cung caáp taïi vò trí theo nhö theå hieän treân baûn veõ.

Ñieåm thoaùt aùp suaát/ nhieät ñoä chung töông töï nhö “nuùt Pete” hay “nuùtt kieåm tra khoùa maéc ñoâi”. Nhaø thaàu seõ cung caáp moät boä duïng cuï ño aùp suaát/ nhieät ñoä.

7.19 OÁNG LOÙT (PIPE SLEEVE)

Neáu ñöôøng oáng chaïy ngang qua töôøng, saøn, nhaø thaàu phuï seõ cung caáp oáng loùt. Caùc oáng loùt cho ñöôøng oáng baèng theùp vaø gang seõ baèng theùp (ôû nhöõng nôi maø ñöôøng oáng ñöôïc maï keõm, thì oáng loùt cuõng ñöôïc maï keõm). Ñoái vôùi oáng nhöïa, oáng loùt cuõng seõ baèng nhöïa. ÔÛ nhöõng nôi maø oáng loùt ñöôïc gaén qua saøn, chuùng seõ keùo daøi ít nhaát 25mm qua saøn ñaõ ñöôïc hoaøn thieän vaø toái thieåu 100mm taïi phoøng maùy vaø nhöõng vò trí ôû maùi.

OÁng loùt cuõng coù kích thöôùc thích hôïp cho pheùp oáng di chuyeån töï do vaø hôn nöõa nhöõng nôi oáng ñöôïc caùch nhieät, oáng loùt phaûi coù kích thöôùc lôùn hôn cho pheùp söï caùch nhieät xuyeân suoát qua oáng loùt.

Cuõng phaûi cung oáng loùt cho oáng xuyeân saøn vôùi taám phuû choáng thaám ñoä saâu thaám haøn vôùi taám chaén choáng thaám vaø gôø chaén.




Neáu oáng ñi xuyeân qua töôøng choáng chaùy vaø taám saøn, chaát ngaên chaùy baèng kim loaïi phaûi ñöôïc haøn hay baét vít xung quanh oáng. Noù phaûi naèm trong maët bích daøy 6mm (toái thieåu) sao cho xaûy ra taïi trung taâm cuûa ñoä daøy taám/ thaønh vaø ñöôïc haøn/ noái ren vaøo oáng, maët bích cuøng ñöôøng kính nhö oáng beân trong oáng loùt.

Neáu ñöôøng oáng xuyeân qua keát caáu xaây döïng, moät oáng loùt coù kích thöôùc lôùn hôn seõ ñöôïc laép ñaët ñeå coù khoaûng troáng töø 12-15mm xung quanh oáng hay phaàn caùch nhieät khi laép ñaët. Khoaûng caùch naøy seõ ñöôïc nheùt ñaày caån thaän vôùi 80kg/m3 sôïi khoaùng vaø ñaàu cuoái cuûa noù seõ ñöôïc haøn kín baèng chaát maùt tít choáng thaám coù tính kín nöôùc.

7.20 LOÏC NÖÔÙC (ÑÖÔØNG OÁNG)

Thieát bò loïc nöôùc ñöôïc laép trong ñöôøng oáng chaûy ngöôïc cuûa caùc maùy vaø nhöõng vò trí theå hieän treân baûn veõ.

Ñoái vôùi thieát bò loïc nöôùc saïch/ nöôùc laïnh, ñöôøng oáng coù ñöôøng kính danh nghóa giöõa 15mm vaø 50mm goàm caû thieát bò loïc noái ren coù thaân baèng hôïp kim hay baèng ñoàng thieác kieåu “Y” vôùi löôùi theùp khoâng gæ.

Ñöôøng oáng coù ñöôøng kính danh nghóa töø 65mm trôû leân, thieát bò loïc seõ ñöôïc laøm maët bích theo tieâu chuaån BS 4504 theo baûng thích hôïp, vôùi thaân baèng gang kieåu “Y”, löôùi baèng ñoàng thau hay theùp khoâng gæ.

Thieát bò loïc se bao goàm voøi ñöôøng kính 20mm ñeå noái thoaùt nöôùc vaø ñöôïc gaén vôùi van thoaùt 20mm.

7.21 BUÙA HAÕM NÖÔÙC

Buùa haõm nöôùc ñöôïc söû duïng taïi ñaàu ñaåy bôm:

● Caàu taïo baèng theùp khoâng gæ söû duïng cho heä thoáng cung caáp nöôùc/ nöôùc laïnh.

● Laø loaïi giaõn nôû beân döôùi vaø ñöôïc naïp nitô tröôùc cuõng nhö ñöôïc haøn kín

7.22 LAØM VEÄ SINH OÁNG

Caùc oáng ñöïôc baûo quaûn vôùi ñaàu bòt kín, khoâng môû ra cho ñeán khi laép ñaët.

Phaûi laøm saïch caùc ñöôøng oáng tröôùc khi, trong khi vaø sau khi laép ñaët, vaø traùnh coù vaät laï trong oáng. Nhaø thaàu phuï coù traùch nhieäm ñoái vôùi moïi hö haïi do caùc maûnh vuïn gaây ra trong oáng.

Ñeå ñaùp öùng vieäc kieåm tra, thoaùt nöôùc cuûa oáng, nhaø thaàu phuï phaûi laøm saïch vaø naïp ñaày heä thoáng oáng ñeå nhaø tö vaán pheâ duyeät.

7.23 CAÙCH NHIEÄT ÑÖÔØNG OÁNG

Lôùp caùch nhieät ñöôøng oáng laø loaïi khoâng chöùa CFC & HCFC, cao su löu hoùa, boït phenolichay Ethylene Propylene Diene Monomer tröø khi ñöôïc coù söï chæ ñònh khaùc vaø hoaøn toaøn ñaùp öùng theo nhöõng ñaëc tính sau:




Ñaëc tính cô hoïc

Tyû troïng toái thieåu • 40 kg/m3 • 100 kg/m3 taïi ñieåm ñôõ cho oáng leân ñeán φ125 • 120 kg/m3 taïi ñieåm ñôõ cho oáng töø φ150 trôû leân

Tính daãn nhieät 0.020 W/moC taïi 100C nhieät ñoä trung bình

Chaát chöùa trong teá baøo kín Toái thieåu 90%

Truyeàn hôi nöôùc 10μgm/Nh ôû 38oC, 88%RH (2 perm-inch)

Daûi nhieät ñoä hoaït ñoäng -80oC to 120oC

Ñaëc tính löûa Tính chaùy buøng theo BS 476 phaàn 5

Loaïi P

Löûa lan roäng theo BS 476 phaàn 5

1 = 10.3, I = 4.1

Lan toûa beà maët theo BS 476 phaàn 7

Loaïi 1

Ñoä môø khoùi theo BS 5111 Döôùi 5% (khoâng ñaùng keå)

Caùc vaät tö söû duïng phaûi choáng chaùy vaø ñaùp öùng nhöõng yeâu caàu cuûa tieâu chuaån Anh BS 476 phaàn 7 vaø phoøng chaùy chöõa chaùy.

Caùch nhieät cho ñöôøng oáng noùi chung phaûi theo tieâu chuaån BS 5970:1981.

Caùc van, thieát bò loïc, maët bích, oáng nöôùc laïnh vaø oáng nöôùc ngöng, phhuï kieän noái vaø nhöõng thieát bò töông töï seõ ñöôïc nhaø maùy caùch nhieät taïo thaønh lôùp fenola caét theo ñoä daøy chæ ñònh vaø thích hôïp vôùi ñöôøng kính beân ngoaøi vôùi vaät tö nhoâm loaïi “O” ñöôïc hoaøn thieän traéng môø coù 8 lôùp vaø hai maøng hôi nöôùc taïo ra lôùp maùttít chaát ñoàng truøng hôïp, lôùp loùt gia coá kính giöõa lôùp aùo (daøy toái thieåu 60μm) vôùi phaàn choàng cheùo nhau daøy 50mm doïc theo ñieåm hôû theo chieàu doïc. Caùc moái noái choàng nhau seõ ñöôïc haøn kín. Caùc moái noái ñoái tieáp giöõa caùc phaàn caùch nhieät seõ ñöôïc haøn kín vôùi daûi roäng 50mm töï keát dính gaén vôùi laù nhoâm loaïi O ñeå taïo tính kín nöôùc bean ngoaøi.

Phaàn caùch nhieät seõ baûo veä ñöôøng oáng baèng phöông phaùp keát dính vaø theo söï ñeà nghò cuûa nhaø saûn xuaát cho moät lôùp phuû 100% treân maët trong vaø daûi kim loaïi choáng aên moøn coù beà roäng khoâng nhoû hôn 20mm ñaët caùch trung taâm 450mm, vôùi caùc daûi phuï naøy taïi caùc ñieåm noái maø vaät tö ñöôïc ñònh hình.

Ñoä daøy toái thieåu cuûa lôùp caùch nhieät nhö sau:

OÁng nöôùc laïnh: • Leân ñeán ∅150: 40mm • ∅150 trôû leân: 50mm • Trong phoøng maùy (moïi kích côõ): 65mm

Oáng daãn nöôùc ngöng tuï: 25mm




Caùc oáng ñaët trong phoøng maùy vaø nhöõng nôi loä ra ngoaøi trôøi seõ ñöôïc bao boïc trong lôùp sôn phuû maï keõm ngoaøi maøng ngaên nöôùc. Ñoä daøy cuûa lôùp sôn phuû khoâng nhoû hôn 0.8mm ñoái vôùi oáng φ150 trôû leân phuû qua lôùp caùch nhieät vaø khoâng nhoû hôn 0.6mm ñoái vôùi oáng nhoû hôn.

Ñoái vôùi nhöõng vò trí ngoaøi trôøi, maøng choáng nöôùc seõ laø lôùp polymer ñaøn hoài döïa treân maøng choáng nöôùc vaø lôùp phuû baûo veä traùnh bò aûnh höôûng cuûa thôøi tieát vôùi caùc maøn gia coá giöõa caùc lôùp. Lôùp sôn phuû cuõng coù tính kín nöôùc vôùi caùc mieáng ñeäm vaø chaát bòt kín.

Caùc van caùch nhieät, thieát bò loïc, maët bích vaø töông töï seõ ñöôïc laép ñaët vôùi nhöõng phaàn taïo tröôùc coù kích thöôùc lôùn ñeå phuø hôïp vôùi ñöôøng kính cuûa maët bích vaø phaàn caùch nhieät cuûa oáng lieàn keà, neáu caùi naøo lôùn hôn. Phaàn coù kích thöôùc lôùn seõ ñaët goái ñaàu leân phaàn oáng caùch nhieät lieàn keà toái thieåu 75mm ôû moãi beân.

Bôm nöôùc laïnh seõ ñöôïc caùch nhieät baèng caùch nhieät ñònh hình vôùi ñoä daøy 65mm vaø ñöôïc ñaët trong oå ñôõ maï keõm daøy 1.2mm ñöôïc saép xeáp sao cho deã daøng thaùo raùp. Oå ñôõ ñöôïc saép xeáp sao cho khoâng gaây hö haïi cho lôùp caùch nhieät khi di chuyeån.

Taïi ñieåm ñôõ, lôùp caùch nhieät laø lôùp boït phenolic khoâng nhoû hôn 100kg/m3 ñoái vôùi oáng coù kích thöôùc leân ñeán φ125 vaø 125kg/m3 ñoái vôùi oáng coù kích thöôùc φ150 trôû leân seõ ñöôïc ñaët ñeå ñaûm baûo tính nguyeân veïn cuûa maøng choáng nöôùc bôûi söï lieân keát caùc heä thoáng ñôõ phaàn caùch nhieät.

Taám môû roäng baèng kim loaïi ñöôïc ñaët giöõa phaàn caùch nhieät vaø heä thoáng ñôõ ñeå traùnh ñieåm taûi troïng treân phaàn caùch nhieät. Khoaûng caùch giöõa phaàn xoáp ñôõ seõ nhö sau:

• ∅15 ñeán ∅52:

• ∅40 ñeán ∅100:

• ∅125 trôû leân:

3mm

4mm

6mm

Khoâng aùp duïng baát cöù lôùp caùch nhieät naøo cho ñeán khi ñöôøng oáng vaø maùy moùc ñöôïc kieåm tra nhö ñaõ xaùc ñònh.

Beà maët cuûa caùc phaàn caùch nhieät phaûi baèng phaúng, ñoàng nhaát. Caùc phaàn cöùng ñoàng taâm vaø khôùp chính xaùc vôùi ñoä daøy. Khoâng chaáp nhaän coù caùc böôùc vaø gôïn soùng treân beà maët. Baát cöù phaàn naøo hay taám naøo coù ñaàu cuoái bò hö hoûng phaûi thaùo boû.

Phaàn caùch nhieät phaûi coù beà maët saïch vaø khoâ, khoâng coù nhöõng maûnh vuïn nhö daàu, môõ, gæ saét, caën hay buïi.

Caùc beà maët ñöôïc caùch nhieät coù daáu hieäu gæ hay hö haïi lôùp maï keõm seõ ñöôïc caïo hoaøn toaøn vaø chaûi baèng baøn chaûi saét neáu caàn tröôùc khi caùch nhieät ñeå laøm saïch caùc gæ saét, caën, vaø nhöõng thöù töông töï. Sau ñoù beà maët ñöôïc laøm saïch baèng chaát loûng ñeå laøm saïch daàu,môõ vaø buïi tröôùc khi phuû lôùp sôn loùt.

Chæ söû duïng nhöõng lôùp caùch nhieät saïch vaø khoâ. Lôùp caùch nhieät noùi chung ñöôïc aùp duïng theo khuyeán caùo cuûa nhaø saûn xuaát.

Maøng chaén nöôùc ñöôïc bòt kín xung quanh caùc thanh treo hay caùc phaàn nhoâ ra khoûi phaàn caùch nhieät.




Phaàn caùch nhòeât lieân tuïc ñöôïc cung caáp qua caùc oáng loùt vaø ñieåm noái caùch nhieät seõ ñöôïc saép xeáp xen keõ vôùi caùc moái noái trong heä thoáng ñöôøng oáng.




7.24 VAN XAÛ KHÍ VAØ NGAÉT CHAÂN KHOÂNG ÑOÁI VÔÙI ÑÖÔØNG OÁNG NÖÔÙC

Caùc van yeâu caàu seõ cung caáp caùc chöùc naêng hay keát hôïp caùc chöùc naêng nhö mieâu taû döôùi ñaây.

Ñöôøng oáng ñaày Khoái löôïng thoaùt khí lieân tuïc lôùn qua mieäng oáng lôùn

Ñöôøng oáng thoaùt/ coät ngaên nöôùc Khoái löôïng laáy khí lieân tuïc lôùn qua mieäng oáng lôùn

Ñöôøng oáng ñaày vaø hoaït ñoäng Thoaùt khí ñieàu aùp qua mieäng oáng nhoû

Giaûm traøo Van keát hôïp vôùi cô caáu mieäng oáng “choáng soác” maø trong quaù trình laøm ñaày oáng vaø khi tieán haønh phaân caùch coät nöôùc seõ hoaït ñoäng töï ñoäng ñeå haïn cheá öùng suaát ngaén do mieäng oáng lôùn gaây neân thaáp hôn 2 laàn van tieâu thuï aùp suaát hoaït ñoäng. Phaûi ñaït ñöôïc giôùi haïn taêng aùp suaát baèng caùch giaûm löôïng nöôùc vaøo tröôùc khi ñoùng van

Van coù ñöôøng kính mieäng lôùn baèng vôùi kích thöôùc danh ñònh cuûa chuùng.

Khoâng chaáp nhaän coù söï haïn cheá tröôùc hay sau mieäng oáng lôùn, nhö löu löôïng nöôùc qua van phaûi toái thieåu töông ñöông vôùi mieäng oáng lôùn.

Khi van khí ñaày nöôùc, noù phaûi kín ôû baát kyø ñaàu naøo giöõa 5m (0.5 bar) vaø gaáp hai laàn hoaït ñoäng toái thieåu cuûa ñaàu van.

Van seõ ñöôïc baûo veä khoâng bò söï coá do caùc chaát laï vaøo qua mieäng oáng lôùn baèng caùc naép lôùn, chaéc vaø chaët vaø thích hôïp vôùi kích thöôùc maét löôùi ñöôïc gaén trong khoaûng caùch chu vi hình voøng giöõa naép vaø phaàn treân cuûa van.

Moãi van khí coù moät raõnh 6mm ñaët thaáp hôn vò trí ñieàu aùp.

Van DN25 vaø DN50 ñeàu coù maët bít hay caùc moái noái baét vít.

Van DN80, DN100, DN150 vaø DN200 coù moái noái maët bích.

Khoâng chaáp thuaän van töï ñoäng coù van ngaét baèng khí vaø chaân khoâng.

Van cöûa hay caùc loaïi khaùc seõ ñöôïc söû duïng ñeå deã daøng caùch ñieän van ngaét khí vaø chaân khoâng töø ñöôøng oáng.

Cung caáp mieáng ñeäm, buloâng, ñai oác vaø voøng ñeäm ñoái vôùi moái noái van khí ñeán van töï ñoäng vaø van töï ñoäng ñeán ñöôøng oáng.

Phao ñieàu khieån coù hình truï vaø ñöôïc saûn xuaát töø chaát polyethylene raén coù maät ñoä cao dính chaët vaøo mieäng oáng lôùn.

Caùc phaàn ñöôïc phaân boå thích hôïp theo caùc löïc taùc ñoäng leân chuùng trong van laép raùp ñeå khoâng coù söï bieán daïng xaûy ra döôùi ñieàu kieän hoaït ñoäng bình thöôøng hay khi van phaûi chòu aùp suaát thuûy tónh 2 laàn so vôùi aùp suaát laøm vieäc.

Thieát keá van coù ñaëc tính aùp suaát an toaøn nhö tröôøng hôïp thoâng thöôøng khi khí neùn cao ñoä ngoät ñöôïc thaûi ra. Ñaëc tính naøy goàm caùc thaønh phaàn coù theå thay theá deã daøng nhö mieáng ñeäm, van vaø nhöõng thöù töông töï.

Mieäng oáng nhoû ñöôïc saûn xuaát töø theùp khoâng gæ 316 loaïi cao caáp.

Mieäng oáng coù caïnh xung quang mieäng oáng nhoû ñöôïc gia coâng treân maùy moät caùch chính xaùc ñeå taïo khoaûng phaúng khoâng bò maøi moøn hay bò caét.




Traùnh khoâng laøm hö haïi moái haøn co giaõn mieäng oáng nhoû baèng ñaëc ñieåm thích hôïp haïn cheá söï xuyeân thaám cuûa mieäng oáng vaøo van.

Van co giaõn mieäng oáng lôùn laø moät voøng chöõ “O” giöõ trong raõnh ñuoâi eùn xung quanh mieäng oáng lôùn.

Voøng “O” khoâng ñöôïc lieân keát vaø keát dính vaøo raõnh ñeå coù theå thay theá deã daøng.

Maët phaúng cuûa phao hình truï seõ taùc ñoäng vaøo nuùt kín.

Ñoä beàn aùp suaát cao vaø kieåm tra khe hôû nhôø ñoù van ñöôïc laøm ñaày vôùi nöôùc vaø taïo aùp suaát gaáp hai laàn aùp suaát laøm vieäc maø noù ñöôïc giöõ trong voøng 2 phuùt. Baát cöù khe hôû, ræ nöôùc hay haáp hôi laø nguyeân nhaân khoâng ñöôïc chaáp thuaän.

Kieåm tra roø ró thaáp nhôø ñoù van ñöôïc laøm ñaày vôùi nöôùc vaø taïo aùp suaát ñeán toái ña 0.5bar (50kPa) söû duïng coät nöôùc noái vôùi thieát bò kieåm tra. Phaûi thaùo van ra neáu tính kín nöôùc loã roø khoâng giöõ ñöôïc trong voøng 2 phuùt.




8. HEÄ THOÁNG XÖÛ LYÙ NÖÔÙC

8.1 TOÅNG QUAÙT

Nhaø thaàu phuï seõ thueâ moät coâng ty xöû lyù nöôùc ñeå xöû lyù toøan boä heä thoáng nöôùc laïnh & nöôùc laøm maùt cuûa coâng trình.

Coâng ty xöû lyù nöôùc seõ laøm moät baûng phaân tích heä thoáng nöôùc vaø ñöa ra chöông trình xöû lyù nöôùc thích hôïp kieåm soaùt ñoä maøi moøn, lôùp maøng treân beà maët, söï phaùt trieån cuûa vi truøng, chaát nhôøn, lôùp caën beân döôùi trong caùc ñöôøng oáng daãn. Nhaø thaàu phuï seõ coù traùch nhieäm kieåm tra vôùi nhaø thaàu xöû lyù maùy nöôùc laïnh vieäc xöû lyù nöôùc ñeà xuaát aáy coù töông thích vôùi thieát bò laøm laïnh hay khoâng.

Choïn löïa hoaù chaát, quaûn lyù vaø löu tröõ chuùng phaûi tuaân thuû theo yeâu caàu cuûa cô quan baûo veä moâi tröôøng ñòa phöông vaø caùc cô quan thaåm quyeàn khaùc coù lieân quan.

Tröôùc tieân hôïp chaát taåy röûa khoâng taïo boït thích hôïp seõ ñöôïc ñöa vaøo heä thoáng oáng. Hôïp chaát naøy seõ loaïi boû taát caû daàu môõ, lôùp saét gæ nhôø caùc hoaù chaát öùc cheá xöû lyù nöôùc. Sau giai ñoaïn tieàn taåy röûa naøy, toaøn boä heä thoáng seõ ñöôïc cho ruùt heát nöôùc vaø taát caû caùc thieát bò loïc, hoà chöùa ñeàu ñöôïc veä sinh.

Moät löôïng hoaù chaát seõ cho vaøo heä thoáng nöôùc daãn nöôùc ñeán nhöõng nôi yeâu caàu.

Nhaø thaàu phuï cuõng seõ coù traùch nhieäm thueâ chuyeân gia xöû lyù nöôùc ñeå thöïc hieän caùc cuoäc kieåm tra döï aùn haøng thaùng trong giai ñoaïn hoï coøn chòu traùch nhieäm phaùp lyù veà vieäc phaùt hieän ra nhöõng sai soùt kyõ thuaät ñeå ñieàu chænh heä thoáng vaø ñaûm baûo chính xaùc caùc yeâu caàu kyõ thuaät trong thôøi haïn baûo trì. Hoï seõ trình baûng baùo caùo sau moãi laàn baûo trì. Coâng ty xöû lyù nöôùc seõ thöïc hieän kieåm tra haøng thaùng vaø:

● Lieàu löôïng boå sung seõ ñöôïc thöïc hieän; vaø

● Tyû leä hoaù chaát ñöa vaøo heä thoáng seõ ñöôïc hieäu chænh ñeå duy trì chính xaùc noàng ñoä hoaù chaát xöû lyù nöôùc

Chöông trình xöû lyù nöôùc cho heä nöôùc laïnh vaø nöôùc laøm phaûi tieán haønh theo tieâu chuaån UÙc AS 3666 - 1989.

Nhaø thaàu phuï chòu traùch nhieäm cung caáp löôïng hoaù chaát ñuû duøng ñeå xöû lyù heä thoáng trong voøng 12 thaùng trong giai ñoaïn hoï coøn traùch nhieäm phaùp lyù veà vieäc phaùt hieän ra nhöõng sai soùt kyõ thuaät. Nhaø thaàu ñoù seõ trình baûng tính theå hieän toøan boä soá löôïng taát caû caùc hoaù chaát caàn duøng trong 12 thaùng vaän haønh.

Ñieàu kieän baûo trì seõ laø:




Danh muïc

■ pH 8 ñeán 10

■ Ñoä ñuïc (FTU scale) Döôùi 10

■ Chaát raén phaân huyû Döôùi 1,000

■ Muoái khoaùng cöùng (CaCO3) Döôùi 3,000

■ P-Alkalinity (nhö CaCO3) Döôùi 100

■ M-Alkalinity (nhö CaCO3) Döôùi 500

■ Chloride (C1), Sulphate (SO4) Döôùi 100

■ Ammoniacal nitrogen (NH3-N) Döôùi 1.0

■ Saét (phaùt sinh)/ñoàng (phaùt sinh) Döôùi 1.0 / 0.2

Toång soá löôïng vi sinh (npml) Döôùi 104

8.2 HEÄ THOÁNG XÖÛ LYÙ NÖÔÙC

Heä thoáng xöû lyù nöôùc laøm maùt vaø nöôùc laïnh seõ ñöôïc baûo veä bôûi chaát choáng maøi moøn ñöa vaøo trong heä thoáng thoâng qua heä thoáng ñònh löôïng ñöa töøng ñôït hoaù chaát vaøo heä thoáng, bao goàm hoà chöùa laøm baèng PVC cöùng coù dung tích vöøa ñuû coù naép ñaäy vaø bôm hoaù chaát (moät bôm döï phoøng) vôùi ngoõ ra coù theå hieäu chænh ñeå cung caáp theâm moät löôïng hoaù chaát theo ñoàng hoà kieåm tra. Caùc hoà chöùa naèm treân seõ cho xaû heát nöôùc, veä sinh vaø bôm nöôùc laïi sau moãi saùu thaùng.

(a) Beå chöùa

Treân côû sôû thoâng tin ñöôïc nhaø thaàu chính cung caáp, nhaø thaàu phuï seõ cung caáp vaø laép ñaët moät soá thieát bò troøn ñeå khöû tia cöïc tím ñöôïc laøm baèng sôïi thuyû tinh, caùc beå chöùa ñeå pha cheá hoaù chaát laøm baèng politen (hoaëc chaát töông töï) vaø yeâu caàu dung tích chöùa ít hôn 180 lít cho heä thoáng nöôùc laïnh hoaëc söû duïng cho 10 ngaøy lieân tieáp.

Beå chöùa seõ ñöôïc cung caáp naép ñaäy laøm baèng sôïi thuyû tinh coù ñoä cöùng cao hoaëc baèng politen coù loã thoaùt thích hôïp vaø caùc yeâu caàu kyõ thuaät laép raùp khaùc ñöôïc pheâ duyeät ñeå hoã trôï vieäc gaén bôm coù ñoàng hoà vaø coâng taéc ñieàu khieån möïc chaát loûng.

Beå chöùa seõ ñöôïc chia daïng lít thaønh 10 möùc.

Beå chöùa phaûi thích hôïp vôùi vieäc pha cheá hoaù chaát cuï theå, hoaït ñoäng bình thöôøng vôùi nhieät ñoä trong nhaø maùy ôû möùc xaáp xæ, tuy vaäy nhieät ñoä thích hôïp cho vieäc hoaø tan hoaù chaát leân ñeán 400 C.

Ñaùy beå chöùa phaúng, chòu löïc toát, cung caáp duïng cuï hoã trôï caàn thieát nhö bôm, heä thoáng loã thoaùt, bôm tay khi beå ñaày nöôùc. Vì theá chu vi beân ngoaøi beå seõ khoâng chòu söùc eùp do aùp suaát nöôùc gaây ra.




(b) Bôm kieåm tra hoaù chaát

Keát hôïp vôùi beå hoaù chaát, nhaø thaàu phuï seõ cung caáp panel hoaëc boàn chöùa treân ñænh ñeå taêng hieäu quaû cuûa bôm hoaù chaát (döï phoøng theâm moät caùi nöõa cho moãi beå). Bôm hoaù chaát seõ coù coâng taéc ñoùng môû vaø moät caàu chì baûo veä.

Voû bôm ñöôïc laøm baèng politen gia coá thuyû tinh choáng maøi moøn vaø taát caû caùc linh kieän ñieän/ ñieän töû ñöôïc boïc laïi. Neáu caàn, caáu truùc van xaû aùp suaát/ khí phaûi ñöôïc kieåm ñònh ñeå ñaûm baûo khoâng bò xì khí/ aùp suaát deã daøng.

Bôm seõ coù phaàn ñaàu laøm baèng acrylic, linh kieän laøm baèng PVC/ protilen, quûa caàu laøm baèng ceramic, voøng ñeäm coù xi Teflon, beà maët liquifilm, caáu truùc van choáng xì khí coù loø xo. Oáng thoaùt seõ coù kích thöôùc vöøa ñuû vaø laøm baèng PVC thích hôïp ñeå truyeàn chaát loûng ñi qua.

Phaàn bôm ngaäp nöôùc seõ ñöôïc gaén vaøo hoà söû duïng moät oáng PVC coù theå ngaâm trong nöôùc laép vôùi van coù ñeá vaø boä loïc.

(c) Thöïc thi

Tröø khi coù nhöõng yeâu caàu cuï theå naøo khaùc, neáu khoâng seõ chuaån bò nöôùc ñeå cung caáp cho beå chöùa hoaù chaát ñöôïc thöïc hieän thoâng qua moät voøi nöôùc bib 18mm gaén treân töøng beå hoaù chaát. Nhaø thaàu phuï seõ cung caáp thieát bò hoã trôï thích hôïp cho caùc voøi bib naøy vôùi heä thoáng ñöôøng oáng coá ñònh treân töôøng. Heä thoáng ñöôøng oáng cung caáp chính coù ñöôøng kính 25mm seõ khoaù nguoàn nöôùc baèng van cho 30m oáng daây laép trong beå. Nhaø thaàu phuï cuõng seõ cung caáp nhöõng oáng linh hoaït vôùi chieàu daøi thích hôïp coù tính naêng khoâng taùc duïng vôùi hoaù chaát töø caùc voøi bib naøy ñeán hoà chöùa ñeå tieän cho vieäc laøm ñaày.

Ñeå ngaên bôm hoaù chaát khoâng vaän haønh lieân tuïc thì hoà chöùa ñeå pha cheá hoaù chaát phaûi troáng. Nhaø thaàu phuï seõ cung caáp vaø laép ñaët treân naép ñaäy cuûa beå chöùa moät coâng taéc ñieàu khieån möïc chaát loûng. Coâng taéc naøy seõ keát hôïp nhòp nhaøng vôùi doøng ñieän cuûa bôm vaø töï ñoäng ngaét nguoàn cung caáp vaø nguoàn trong maùy bôm thoâng qua coâng taéc tröïc tieáp hay rôø le.

Coâng taéc ñieàu khieån möïc chaát loûng seõ chöùa moät hôïp chaát choáng maøi moøn vôùi politen gia coá thuyû tinh. Moät oáng coù phao laøm baèng PVC, phao politen, coâng taéc ôû daïng löôõi gaø.

Trong töøng tröôøng hôïp, seõ coù thieát bò baûo veä phao ñeå ngaên tröôøng hôïp sai thao taùc do bò chaäp. Boä bieán aùp vôùi ñieän aùp nhoû hôn 12 voân ñeå ñaûm baûo an toaøn söû duïng coâng taéc.

Voû coâng taéc ñieàu khieån möïc chaát loûng seõ ñöôïc laøm töø kim loaïi khoâng gæ saét hoaëc choáng maøi moøn.

Beå tröõ hoaù chaát coù möïc chaát loûng treân 300mm so vôùi möùc saøn cuûa khung theùp choáng maøi moøn trong beå.

Heä thoáng seõ ñöôïc doäi röûa söû duïng hoaù chaát phaân huyû thích hôïp vaø chaát taåy maïnh ñöôïc ñeà xuaát bôûi nhaø saûn xuaát hoaù chaát xöû lyù nöôùc noåi tieáng vaø coù giaáy chöùng nhaän ñaûm baûo cuûa coâng ty ñoù, vì theá coù theå maïnh daïn söû duïng.

Caùc hoaù chaát seõ löu laïi trong heä thoáng ñeå söû duïng cho nhieàu giôø lieàn theo chu trình hoaït ñoäng maø noù seõ ñöôïc bôm leân, ñöôïc nhaø cung caáp ñeà xuaát vôùi hoã trôï kyõ thuaät mieãn phí ñöôïc chaáp thuaän bôûi tö vaán.




Sau ñoù heä thoáng seõ ñöôïc ruùt heát nöôùc vaø doäi röûa cho ñeán khi kieåm tra theo doõi taát caû caùc vò trí chaát loûng ruùt ñi khoâng coøn chaát lô löûng vaø ñöôïc tö vaán chaáp thuaän.

Thaønh coâng hay thaát baïi cuûa quaù trình vaän haønh treân seõ tuyø thuoäc vaøo toác ñoä chaûy cao cuûa chaát loûng ñi qua vaø hoaøn toaøn lieân quan ñeán kích thöôùc cuûa caùc vò trí chaát loûng ruùt ñi, khaû naêng khoâng khí ñöa vaøo heä thoáng oáng khí treân ñænh.

Ñeå nhaèm laøm khoâ chaát loûng toác ñoä cao, nhaø thaàu phuï seõ cung caáp moät loã thoaùt coù van taïm thôøi 500mm ôû taát caû caùc vò trí cuûa heä thoáng oáng chính coù ñöôøng kính 50mm hoaëc lôùn hôn.

Nhaø thaàu phuï seõ xaùc ñònh seõ coù bao nhieâu loã thoaùt caïnh ñöôøng oáng lôùn ñeå ñaûm baûo nöôùc khoâng bò ñoïng laïi nhöõng nôi thaáp.

Tieáp theo quy trình doäi röûa, caùc vò trí ruùt chaát loûng duøng caùc van 15mm, taát caû caùc kích thöôùc theå hieän cuï theå treân baûn veõ trong phuï luïc hôïp ñoàng.

Heä thoáng oáng coù chöùa hoùa chaát seõ ñöôïc laép ñaët ôû khu vöïc “Ñöôøng oáng vaø Nuùt ñaäy” trong thoâng soá kyõ thuaät naøy vaø taát caû caùc nguyeân vaät lieäu söû duïng phuø hôïp vôùi quy trình söû duïng hoaù chaát.

Duïng cuï kieåm tra ñöôïc ñöa ra trong hôïp ñoàng phuï naøy vôùi soå nhaät kyù, höôùng daãn vaän haønh theå hieän soá lieàu duøng, soá laàn kieåm tra vaø noàng ñoä pH, coâ ñaëc chaát öùc cheá, toång chaát raén phaân giaûi.

Bôm hoaù chaát coù coâng taéc xaû chæ baùo baèng ñeøn baùo ñoäng ñeå baùo leân tuû MVAC hay BMS vaø töï ñoäng thay ñoåi bôm döï phoøng khi bôm chính hö.

Hoà chöùa cuõng coù thieát bò ñieàu khieån möïc chaát loûng ñeå baùo ñoäng möïc chaát loûng cao hay thaáp cho tuû MVAC hoaëc BMS.




9. HEÄ THOÁNG ÑIEÄN

9.1 TOÅNG QUAÙT (a) Tieâu chuaån

Toaøn boä heä thoáng ñieän seõ ñöôïc thöïc hieän theo nguyeân taéc löôùi ñieän AS3000ASS.

(b) Caân baèng taûi Taûi seõ ñöôïc caân baèng thaäm chí coù theå chuyeån sang 3 pha.

9.2 TUÛ ÑIEÄN PHUÏC VUÏ CÔ KHÍ (MSSB)

Tuû ñieän phuïc vuï cô khí (MSSB) seõ ñöôïc nhaø thaàu phuï veà ñieän cung caáp. Nhaø thaàu phuï (MVAC) seõ hôïp taùc vôùi nhaø thaàu phuï veà ñieän ñeå ñaûm baûo caùc danh muïc beân döôùi ñöôïc cung caáp ñeå hoaøn chænh tuû ñieän phuïc vuï cô khí saün saøng vaän haønh vaø ñuùng chöùc naêng. (a) Toång quaùt

Tuû ñieän phuïc vuï cô khí seõ ñöôïc cung caáp trong moãi phoøng maùy hoaëc nhöõng nôi theå hieän treân baûn veõ. Taát caû tuû ñieän seõ ôû daïng 1. RMS cho tuû ñieän ñöôïc nhaø thaàu phuï veà ñieän cung caáp. Taát caû caùc panel ñieän chính seõ coù maët tröôùc coá ñònh, maët tröôùc seõ ñöôïc noái vaøo moät phoøng nhoû ñöôïc thieát keá tuaân thuû theo yeâu caàu cuûa AS1136. Moãi panel seõ ñöôïc thieát keá coù kích thöôùc phuø hôïp vôùi töøng muïc ñích söû duïng vaø töøng vò trí. Trong taát caû caùc thieát bò cuï theå, caùp vaøo vaø caùp ra coù nhöõng khoaûng khoâng gian vöøa ñuû theo tieâu chuaån cuûa AS3000 ñeå khi coù theå loaïi boû thieát bò hö hay tieáp xuùc ñeå laép ñaët vaø baûo trì sau naøy. Thieát bò gaén leân panel theo caùch maø khi baát kyø thieát bò naøo coù theå gôõ boû maø khoâng aûnh höôûng ñeán baát kyø thieát bò naøo khaùc. Thieát bò coù theå tieáp xuùc ñeå vaän haønh tuû ñieän nhö coâng taéc boä choïn loïc, ñeøn baùo hieäu seõ ñöôïc gaén vaøo panel cuûa buoàng ñieän. Caùc thieát bò ñieàu khieån vaø chæ baùo seõ ñöôïc cung caáp cho töøng tuû, ñeøn baùo heä thoáng ñang hoaït ñoäng bình thöôøng, ñeøn baùo loãi cho töøng ñieàu khieån, ñoàng hoà ño voân keá, coâng taéc choïn loïc, coâng taéc ñoàng hoà baám giôø, coâng taéc kieåm tra ñeøn. Coâng taùc baûo trì ñöôïc thöïc hieän thoâng qua cöûa baûo trì.

(b) Thi coâng Caùc buoàng ñieän ñöôïc thieát keá baèng caùch haøn, cheá taïo töø caùc taám theùp coù ñoä daøy khoâng nhoû hôn 1.6mm, caùc taám theùp ñöôïc uoán ñeå giaûm thieåu caùc moái haøn vaø ñoàng thôøi ñaùp öùng ñöôïc hieäu quaû chaéc chaén, khoâng coù nhieàu cöûa laép vôùi nhau. Caùc cöûa seõ ñöôïc cheá taïo töø caùc taám theùp coù ñoä daøy khoâng quaù 1.6mm, uoán vaø gheùp vôùi nhau ñeå taêng theâm ñoä chaéc chaén, traùnh bò cong. Cöûa phaûi thaúng, baèng vaø khoâng bò bieán daïng. Meùp phaûi troøn, khoâng saéc. Cöûa seõ ñöôïc laép leân buoàng ñieän bôûi moät taám kim loaïi crom coù baûn leà rôøi.




Cöûa seõ ñöôïc laép tay caàm coù boïc kim loaïi crom coù theå khoùa hoaëc daïng tay caàm khaùc coù choát. Cöûa coù kích thöôùc ñöôøng cheùo lôùn hôn 1000mm cuõng seõ laép vôùi caùc choát khoùa ngang. Leà cöûa seõ ñöôïc laép caùc mieáng ñeäm. Cöûa coù theå loaïi boû töøng caùi moät maø khoâng aûnh höôûng ñeán baát kyø caùi naøo khaùc. Daây noái ñaát seõ ñöôïc cung caáp nhôø buoàng ñieän bao goàm maùi che, cöûa baèng caùch söû duïng loâng ñeàn hình sao coù raêng cöa ñöôïc ñaët döôùi ñai oác vaø bu loâng.

(c) Hoaøn thieän Tröø khi coù nhöõng yeâu caàu cuï theå veà hoaøn thieän buoàng ñieän caû beà maët beân trong vaø beân ngoaøi. Sau khi thieát keá caùc buoàng ñieän cuûa tuû ñieän, maùi che vaø cöûa, taát caû caùc moái haøn seõ noái ñaát suoân seû vaø toaøn boä tuû seõ ñöôïc veä sinh lôùp saét gæ, veát daàu môõ. Sôn loùt treân beà maët ñeå choáng maøi moøn. Lôùp sôn loùt seõ ñöôïc xem laø lôùp neàn cho lôùp sôn cuoái cuøng tröø khi coù yeâu caàu naøo khaùc cuûa nhaø saûn xuaát sôn. Ít nhaát coù hai lôùp sôn boùng sau cuøng nhö lôùp men chòu nhieät, hoaëc lôùp sôn hoaøn chænh.

(d) Thanh caùi vaø ñaàu noái Thanh caùi laø duïng cuï ñaáu noái ñöôïc öa chuoäng nhaát ñoái vôùi heä thoáng daây cuûa caùc thieát bò baûo veä cho moãi maïch. Caùc boä phaän laép raùp thanh caùi coù nhieàu loã seõ ñöôïc söû duïng ôû nhöõng nôi coù theå chaáp nhaän ñöôïc. Thanh caùi ñöôïc ño coâng suaát ñeå thöïc hieän taûi toái ña taát caû caùc thieát bò coù söï gia taêng nhieät ñoä toái ña theo tieâu chuaån AS1136. Thanh caùi vaø chi tieát ñôõ thanh caùi seõ ñöôïc thieát keá chòu ñöôïc söùc eùp taïo ra töø caùc doøng bò roø do söï coá. Thanh caùi seõ ñöôïc nhaän daïng bôûi oáng loùt maøu hoaëc daûi maøu 25mm taïi vò trí caùch taâm 500mm vôùi ít nhaát daûi maøu cho moãi ñoaïn thanh caùi. Caùc maøu theå hieän caùc pha, trung tính, noái ñaát. Ñaàu noái caùp coù theå söû duïng trong panel ñieàu khieån. Caùp seõ tuaân theo tieâu chuaån AS3147 vaø seõ coù kích thöôùc nhaát ñònh ñeå haïn cheá nhieät ñoä toái ña, khi taát caû caùc thieát bò taûi heát coâng suaát, seõ phaân löôïng cho caùp caùch ñieän ñieàu chænh löôïng ñieän phoùng ra trong tröôøng hôïp bò chaäp maø khoâng laøm hoûng thieát bò. Thanh caùi trung tính vaø noái ñaát hoaëc caùc keát noái seõ ñöôïc cung caáp ôû daïng rieâng bieät ñoái vôùi keát noái cuûa taát caû caùc daây daãn noái ñaát vaø trung gian vaøo vaø ra.

(e) Caùp ñaàu cuoái Buoàng ñieän seõ ñöôïc cung caáp caùc phöông tieän ñi caùp ñuû bao goàm caùc khe vaøo laép vôùi baûng kim loaïi coù theå di chuyeån, ñeäm caùp. Baûng kim loaïi coù ñeäm ñoàng cuõng seõ ñöôïc cung caáp cho caùp M.I.M.S ñaàu cuoái.




Chi tieát ñôõ thích hôïp nhö oáng gioù, khay hoaëc daây ñôõ seõ ñöôïc cung caáp trong panel ñieàu khieån cuûa taát caû caùc caùp vaøo vaø ra. Caùp vaøo vaø ra söû duïng naêng löôïng hoaëc ñieàu khieån ñöôïc ñaáu noái taïi nhöõng nôi coá ñònh trong panel ñieàu khieån, khoâng phaûi treân hinged panel. Caùp naêng löôïng coù theå ñöôïc ñaáu noái tröïc tieáp vaøo coâng taéc vaø boä ñeà ñaàu cuoái. Daây ñieàu khieån seõ ñöôïc ñaáu vaøo daûi ñaàu cuoái coù ñaùnh soá. Ñaáu noái beân trong seõ ñöôïc cung caáp giöõa daûi ñaàu cuoái vaø thieát bò.

(f) Daây ñieàu khieån Daây ñieàu khieån seõ tuaân thuû yeâu caàu tieâu chuaån AS3147. Kích thöôùc daây daãn toái thieåu laø 7/0.5mm hoaëc 30/0.24mm. Daây daãn seõ ñöôïc caùch ñieän vôùi ñieän aùp toái thieåu 250voân, V75 daïng PVC. Daây daãn ñöôïc daãn trong busbar maø khoâng ñöôïc baûo veä seõ ñöôïc caùch ñieän gaáp hai laàn. Voû caùch ñieän cuûa daây ñieàu khieån seõ coù moät maøu thoâng qua panel ñieàu khieån vaø maøu seõ ñöôïc nhaän bieát noù vôùi baát kyø daây nguoàn naøo khaùc. Daây ñieàu khieån seõ ñöôïc nhaän bieát bôûi thieát bò bòt saét ôû hai ñaàu hoaëc duøng oáng loàng daây daãn vaøo trong. Ñaàu bòt saét hay oáng boïc seõ laøm baèng nhöõng vaät lieäu caùch ñieän tröø khi coù yeâu caàu cuï theå naøo khaùc vaø noù söû duïng kyù töï maøu traéng vaø maøu ñen. Daây ñieàu khieån seõ ñi rieâng bieät vôùi daây nguoàn. Ñaàu cuoái cuûa daây daãn khoâng caàn söû duïng daïng oáng roãng, cuïm ñaàu cuoái seõ ñöôïc phaân loaïi theo nguoàn ñieän. Cuïm ñaàu cuoái söû duïng oáng daây ñeå loàng vaøo seõ söû duïng ñinh oác vaën chaët vôùi moät mieáng kim loaïi moûng coù daïng raêng laøm loâng ñeàn. Ñaàu cuoái ñöôïc nhaän daïng baèng heä thoáng ñaùnh daáu vaø ñaùnh soá. Tröø hao chieàu daøi cuûa moãi daây taïi ñieåm keát noái vôùi moät ñaàu cuoái ñeå laøm laïi ñaàu cuoái maø khoâng aûnh höôûng ñeán ñöôøng daây chính. Tröø khi coù söï chaáp thuaän naøo khaùc, coøn khoâng thì moät daây seõ keát noái vôùi moät ñaàu cuoái.

9.3 LINH KIEÄN TRONG PANEL ÑIEÀU KHIEÅN ÑIEÄN (a) Toång quaùt

Caùc linh kieän cuûa moät loaïi thieát bò nhö daây daãn phaûi cuøng nhaø saûn xuaát ñeå deã daøng laép raùp.

(b) Coâng taéc caùch ly Coâng taéc caùch ly bao goàm thieát bò caùch ñieän chính naèm trong panel ñieàu khieån seõ tuaân theo AS1775 vaø phuø hôïp vôùi coâng suaát ngaét taûi. Phaân loaïi coâng duïng seõ laø AC-23.

(c) Caàu dao Caàu dao seõ coù voû laøm baèng hôïp chaát tuaân theo yeâu caàu cuûa AS3111 hoaëc AS2184 tuyø vaøo taûi vaø phaân löôïng nguoàn khi gaëp söï coá. Tyû leä nguoàn phaân löôïng seõ ñöôïc ñaùnh daáu roõ raøng treân caàu dao vaø deã daøng nhìn thaáy khi coâng taéc ngaét maïch ñöôïc laép treân panel ñieàu khieån. Nhaän bieát caùc vò trí tieáp xuùc seõ ñöôïc ñaùnh daáu roõ raøng treân caàu dao baèng maøu töông phaûn.




(d) Caàu chì Caàu chì seõ ñöôïc laøm baèng daïng oáng H.R.C tuaân theo yeâu caàu cuûa AS2005. Caàu chì seõ ñöôïc gaén trong thieát bò ñieàu khieån töông töï vôùi G.E.C Red Spot. Khoâng caàn phaûi coù duïng cuï ñaëc bieät ñeå laáy caàu chì ra hay gaén vaøo.

(e) Coâng taéc tô vaø boä khôûi ñoäng motor Coâng taéc tô seõ laøm baèng daïng khoái, daïng ngaét khí baèng ñieän töø tuaân theo yeâu caàu cuûa tieâu chuaån AS1029. Boä ñeà motor seõ tuaân theo yeâu caàu cuûa tieâu chuaån AS1202. Coâng taéc tô bao goàm nhöõng thieát bò trong ñoù coù moät soá thieát bò naèm trong motor vaø seõ coù nhöõng ñaëc tính sau: ● Taûi phaân löïông, khoâng lieân tuïc, loaïi 0.3 ● Phaân loaïi caùch duøng, AC-3 ● Ñoä beàn cô hoïc, loaïi 10 ● Thôøi gian tieáp xuùc, khôûi ñoäng 1 trieäu laàn vôùi AC-3 ● Hoaït ñoäng khoâng gaây oàn ● Tieáp xuùc maïch noái tieáp, song song seõ khoâng söû duïng taûi phaân löôïng

Boä khôûi ñoäng motor noái tröïc tieáp vôùi thieát bò baûo veä quaù taûi ôû töøng pha cung caáp, tröø khi coù yeâu caàu naøo khaùc töø nhaø cung caáp.

(f) Thieát bò trong coâng taéc ñieàu khieån Thieát bò trong coâng taéc ñieàu khieån nhö rôø le töùc thôøi, rôø le hoaõn thôøi gian, coâng taéc ñieàu khieån vaø coâng taéc nhaán seõ tuaân theo yeâu caàu cuûa AS1431. Rôø le seõ laøm ôû daïng phích caém vôùi toác ñoä toái thieåu 6 laàn tieáp xuùc ôû cöôøng ñoä doøng ñieän 6 ampe ñoái vôùi taûi vaøo. Cuoän daây trong rôø le coù theå hoaït ñoäng theo coâng suaát yeâu caàu vôùi ñieän aùp cung caáp thay ñoåi töø +10% ñeán –20%. Coâng taéc ñieàu khieån seõ laøm baèng cam xoay vôùi hai caùi ngaét lieân tieáp vôùi ñieàu kieän doøng toái thieåu laø 6ampe 220v AC, söû duïng loaïi AC-11. Coâng taéc nhaán nuùt laøm ôû daïng kín khoâng thaám daàu hoaït ñoäng ôû cöôøng ñoä doøng ñieän 6ampe ñieän aùp 22voân AC söû duïng loaïi AC-11. Nuùt coù ñöôøng kính khoâng nhoû hôn 22mm.

(g) Ñeøn baùo Ñeøn baùo seõ laø ôû daïng kín khoâng thaám daàu baèng plastic chòu noùng hoaëc thaáu kính thuyû tinh, ñöôøng kính toái thieåu 22mm. Ñeøn laø daïng boùng ñeøn coù ñoä saùng choùi, hoaït ñoäng ñieän aùp 24voân, khoaûng 2 ñeán 6W. Ñeøn coù theå thay ñoåi töø maët tröôùc cuûa panel ñieàu khieån vaø ñeá ñeøn ñöôïc coá ñònh chaéc chaén vôùi panel.

(h) Daùn nhaõn Moãi panel ñieàu khieån vaø moãi thieát bò treân hoaëc trong panel ñieàu khieån seõ ñöôïc daùn nhaõn roõ raøng vaø chính xaùc ñeå nhaän bieát vaø trong hoäp coâng taéc, coâng taéc nhaán nuùt ñeàu theå hieän chöùc naêng, höôùng daãn caùch vaän haønh, … thích hôïp.




Kích thöôùc toái ña cuûa chöõ vieát treân nhaõn laø 3mm, côõ chöõ lôùn hôn seõ söû duïng ôû nhöõng nôi thích hôïp. Chöõ coù maøu töông phaûn vôùi maøu neàn cuûa noù. Chöõ khaéc saâu vaøo seõ coù maøu ñen treân neàn traéng ngoaïi tröø tröôøng hôïp nhaõn treân coâng taéc chính seõ coù maøu ñoû treân neàn traéng.

9.4 LAÉP ÑAËT HEÄ THOÁNG ÑIEÄN (a) Toång quaùt

Tröø moät soá daây cuï theå, noùi chung daây ñöôïc ñi trong caùp TPS ñöôïc boïc laïi coù theå ôû treân traàn, töôøng, khoaûng caùch giöõa caùc vaùch ngaên daây yeâu caàu naèm trong MIMS theo tieâu chuaån cuûa AS1668. Haïn cheá toái ña daây loä thieân, yeâu caàu phaûi ñöôïc baûo veä cô hoïc hoaëc noù seõ ñöôïc ñi aâm trong töôøng, noù seõ ñöôïc chaïy trong caùp. Daây daãn seõ keát hôïp vôùi tuû phuïc vuï cô khí, seõ khoâng taäp hôïp laïi vôùi nhau hoaëc seõ khoâng chaïy trong cuøng moät ñöôøng oáng, khay, khung vôùi caùc thieát bò ñieän khaùc vaø vôùi caùc daây tieáp xuùc ôû cuøng moät choã.

(b) Caùp, oáng daãn vaø ngaên caùp. Caùp seõ ñöôïc laøm baèng PVC cöùng loaïi B theo yeâu caàu cuûa AS2053 hoaëc theùp maï keõm theo yeâu caàu cuûa tieâu chuaån AS2052. Caùp thöôøng ñöôïc taäp hôïp laïi ôû daïng boù laïi thaønh coät doïc ñi doïc treân beà maët phaúng baèng caùch chaïy trong nhöõng vaùch ngaên töôøng, khoaûng khoâng treân traàn hoaëc seõ ñi aâm trong töôøng, phuø hôïp vôùi chi tieát neâu trong baûn veõ. Khi caùp vaø daây daãn chaïy treân beà maët, seõ ñöôïc ñi song song goïn gaøng, vuoâng vöùc vôùi caáu truùc cuûa toaø nhaø nôi coù hôn moät daây caùp phaûi seõ cho chaïy cuøng chieàu vôùi nhau ñeå chuùng ñi theo nhoùm vôùi nhau. Nôi coù caùp hôn 12m cuoän vaøo trong hoäp vôùi khoaûng caùch giöõa hai ñaàu khoâng neân quaù 12m. Taát caû caùp vaø daây daãn phaûi ñònh vò vaø ñöôïc laép kieân coá tröôùc khi ñöa baát kyø daây naøo khaùc vaøo. Caùp ñeå loä thieân ra ngoaøi seõ ñöôïc coá ñònh khoâng ñeå loä ra ngoaøi hôn 6mm. Caùp linh ñoäng söû duïng cho keát noái cuoái cuøng vôùi motor vaø caùc öùng duïng bao goàm caùp “Seaflex” vôùi loaïi “Neta” ñeå ñoát noùng hoaëc phaù huyû cô hoïc khi söû duïng caùp linh ñoäng hoaëc Thomas & Betts Anacoda Sealtite. Nôi khay caùp vaø daây daãn treo beân döôùi saøn, traàn ñôn ñeå deã daøng laép ñaët hoaëc loaïi boû caùp. Ñieàu chænh daây daãn, giaù treo phaûi phuø hôïp thieát bò giaõn nôû baèng kim loaïi nhö Loxin, Rawllug, caùc thieát bò ñaõ ñöôïc chaáp thuaän töø nhaø saûn xuaát ñeå laép ñaët chính xaùc vôùi khuyeán caùo cuûa nhaø saûn xuaát. Phích caém laøm baèng goã, plastic khoâng ñöôïc pheùp duøng.

(c) Vaät lieäu daây daãn Daây daãn vaø caùp seõ ñöôïc laøm bôûi nhöõng nhaø saûn xuaát cuï theå nhö ñaõ theå hieän Danh muïc döõ lieäu kyõ thuaät, loaïi V75 PVC caùch ñieän, ñieän aùp 660 voân vôùi daây daãn baèng ñoàng theo yeâu caàu cuûa AS3147. Daây va øcaùp môùi vaø ñöôïc ñöa ñeán coâng tröôøng ôû daïng coøn nguyeân bao bì. Daây daãn linh ñoäng seõ coù ñöôøng kính khoâng quaù 24/0.2mm.




(d) Laép ñaët daây daãn Nôi coù soá löôïng lôùn daây daãn chaïy vôùi nhau, daây seõ bò noåi leân ôû panel ñieàu khieån vì theá ñeå chuùng chaïy ôû daïng caùp hoaëc ñöa vaøo trong khay caùp. Taát caû daây daãn coù theå laáy ra. Vì theá daây daãn seõ khoâng neân boù laiï thaønh moät khoái chaéc chaén, hoaëc cho chaïy trong khoái beâ toâng, hay plastic chaéc chaén. Toaøn boä daây seõ ñöôïc thöïc hieän treân heä thoáng cuoän. Daây TPS chaïy beân trong töôøng coù theå tieáp xuùc vaø loaïi boû seõ coù chieàu daøi giöõa hai ñaàu khoâng nhoû hôn 1200mm. Hoaëc coù theå treo treân heä thoáng maéc xích. Giaáu daây daãn seõ ñaët naèm treân ñænh cuûa traàn, choã boùng ñeøn hoaëc nhöõng vaät duïng naøo ñoù treân traàn.




10. SÔN, DAÙN NHAÕN VAØ HOAØN TAÁT

10.1 VAÄT LIEÄU

Taát caû caùc thieát bò cuûa heä thoáng ñöôïc laép ñaët theo Quy phaïm Kyõ thuaät naøy tröôùc tieân seõ ñöïôc sôn baèng lôùp sôn men chaát löôïng ñöôïc pheâ duyeät, maøu saéc, nhaõn hieäu cuõng ñöôïc pheâ duyeät bôûi tö vaán, ngoaïi tröø moät soá boä phaän xaùc ñònh thì ñöôïc sôn baèng chaát lieäu sôn khaùc hoaëc ngöôïc laïi khoâng sôn ôû nhöõng nôi naøy.

Yeâu caàu sôn taát caû caùc ñöôøng oáng vaø oáng daãn thì caàn cung caáp maõ maøu sôn, nhaõn hieäu theo yeâu caàu kyõ thuaät.

Maøu sôn ñöôïc choïn seõ chòu nhieät treân beà maët vaø phuø hôïp vôùi caùc yeâu caàu veà ñieàu kieän moâi tröôøng nôi noù ñöôïc ñaët.

Caùc loaïi sôn söû duïng ñöôïc laøm cuøng moät nhaø saûn xuaát vaø ñöôïc pheâ duyeät cuûa tö vaán vaø caùc boä phaän sau khi sôn hoaøn chænh seõ phaûi thaät boùng tröø khi coù söï chæ ñònh naøo khaùc cuûa tö vaán.

Sôn ôû caùc boä phaän laép ñaët beân ngoaøi phaûi chòu ñöôïc hieäu öùng maøi moøn vaø phaûi ôû daïng sôn epoxit.

Tröôùc khi thöïc hieän sôn phuû, sôn loùt, sôn hoaøn chænh nhaø thaàu phuï seõ ñeà xuaát keá hoïach saép xeáp maøu saéc ñeå tö vaán pheâ duyeät.

10.2 MAÙY MOÙC VAØ THIEÁT BÒ

Taát caû caùc loaïi sôn, maùy moùc, thieát bò caàn ñöôïc sôn seõ sôn moät lôùp hoaøn chænh thaät boùng söû duïng maøu vaø nhaõn hieäu phaûi ñöôïc söï chaáp thuaän cuûa tö vaán, ngoaïi tröø nhöõng nôi ñöôïc sôn hoaøn chænh theo tieâu chuaån cuûa nhaø saûn xuaát nhöng cuõng ñöôïc tö vaán pheâ duyeät.

10.3 THIEÁT BÒ BAÈNG KIM LOAÏI LOÄ THIEÂN

Taát caû caùc thieát bò loä thieân seõ ñöôïc chaø baèng baøn chaûi saét, veä sinh lôùp saét gæ, maûng saét gæ, lôùp dô, daàu môõ sau ñoù seõ sôn moät lôùp sôn phuû, moät lôùp sôn loùt, vaø moät lôùp hoaøn chænh thaät boùng vôùi maøu saéc ñöôïc duyeät bôûi tö vaán.

Lôùp sôn phuû cho phaàn saét maï keõm loä thieân seõ laø lôùp sôn ñöôïc tö vaán pheâ duyeät.

Sôn loùt cho thieát bò kim loaïi khoâng gæ saét loä thieân seõ söû duïng lôùp sôn duøng cho kim loaïi vaø ñöôïc tö vaán pheâ duyeät.

10.4 THIEÁT BÒ KIM LOAÏI ÑÖÔÏC BAÛO VEÄ

Taát caû caùc beà maët baèng saét coù maï keõm ñöôïc baûo veä naèm trong maùi nhaø, traàn vaø oáng daãn trong coâng trình seõ khoâng caàn sôn.

Taát caû caùc beà maët baèng theùp vaø saét maøu ñen seõ ñöôïc queùt baèng baøn chaûi saét vaø sôn moät lôùp sôn loùt.

10.5 CAÙCH ÑIEÄN THIEÁT BÒ HOAØN CHÆNH NAÈM AÂM TRONG TÖÔØNG

Beà maët caùch ñieän naèm aâm trong töôøng seõ ñöôïc sôn moät lôùp sôn phuû, moät lôùp sôn loùt bao goàm hai lôùp trong moät lôùp sôn loùt thoâng thöôøng : moät laø lôùp sôn choáng thaám vaø moät laø lôùp sôn boùng hoaøn chænh.




10.6 HEÄ THOÁNG OÁNG VAØ VOÛ BOÏC KIM LOAÏI

Heä thoáng oáng vaø voû boïc kim loaïi seõ ñöôïc sôn nhö sôn cho heä thoáng thieát bò baèng kim loaïi ñöôïc baûo veä vaø loä thieân.

Nhöõng phaàn dieän tích trôn cuûa van, thieát bò ñieàu khieån seõ ñöôïc veä sinh vaø ñaùnh boùng vôùi söï pheâ duyeät cuûa tö vaán.

10.7 NHAÄN DAÏNG HEÄ THOÁNG OÁNG

Taát caû caùc ñöôøng oáng seõ ñöôïc nhaän daïng theo yeâu caàu BS1710.

Chu vi cuûa caùc maøu noái ñaát chuaån coù ñoä roäng khoâng quaù 100mm treân ñöôøng oáng coù ñöôøng kính thoâng thöôøng 50mm, ñoä roäng khoâng quaù 150mm ñoái vôùi ñöôøng oáng lôùn hôn 50mm.

Maøu boå sung hieån thò thaønh daûi coù ñoä roäng khoâng quaù 25mm ôû vò trí trung taâm cuûa daûi maøu noái ñaát.

Kyù töï yeâu caàu sôn maøu töông phaûn theo tieâu chuaån, caùc chöõ in coù chieàu cao khoâng quaù 15mm ñoái vôùi ñöôøng oáng coù ñoä roäng ñöôøng kính leân ñeán 50mm, caùc chöõ hoa cao khoâng quaù 40mm ñoái vôùi ñöôøng oáng lôùn hôn.

Daûi nhaän daïng seõ ñöôïc ñònh vò ôû vò trí deã nhìn thaáy trong moãi ngaên hay phoøng, caùc oáng daây chaïy ôû ñaây seõ ñöôïc ñaët ôû vò trí trung taâm khoâng vöôït quaù 6m ñeå nhìn thaáy taát caû caùc chi tieát vaø ñöôïc chaáp thuaän bôûi tö vaán.

Höôùng ñi cuûa ñöôøng oáng seõ ñöôïc chæ daãn baèng muõi teân vaø ñöôïc sôn ôû caïnh ñöôøng oáng vôùi töøng daûi maøu rieâng. Caùc muõi teân theå hieän seõ coù chieàu daøi 75mm ñoái vôùi ñöôøng oáng coù ñöôøng kính 50mm vaø chieàu daøi 150mm ñoái vôùi oáng lôùn hôn.

10.8 NHAÄN DAÏNG OÁNG GIOÙ

Taát caû caùc oáng khoâng khí seõ chæ baùo bôûi panel maøu coù ñoä roäng khoâng quaù 100mm ñoái vôùi taát caû caùc ñöôøng oáng coù kích thöôùc khaùc nhau

● Oáng gioù caáp: maøu xanh da trôøi ● OÁng gioù hoài: maøu xanh laù caây ● Oáng gioù khí töôi: maøu ñoû ● Oáng gioù thaûi thoâng thöôøng: maøu xaùm ● Oáng gioù thaûi toilet: maøu naâu

Caùc kyù töï yeâu caàu sôn maøu töông phaûn, chöõ hoa coù chieàu cao khoâng quaù 80mm.

Daûi nhaän bieát seõ ñöôïc ñònh vò ôû vò trí deã nhìn trong moãi ngaên hay phoøng thoâng qua caùc oáng daây, caùc daûi naøy seõ ñöôïc ñaët ôû vò trí trung taâm khoâng vöôït quaù 6m.

Höôùng ñi cuûa ñöôøng oáng seõ ñöôïc chæ daãn baèng muõi teân sôn maøu caïnh caùc ñöôïc oáng khí vôùi moãi daûi maøu. Caùc muõi teân seõ coù chieàu daøi 150mm.




10.9 SÔ ÑOÀ MAØU SAÉC

Toaøn boä thieát bò laép ñaët ñöôïc sôn theo danh muïc maøu sau

Heä thoáng oáng

● Nhaän daïng BS 1710 ● Maõ maøu BS 4800

Maõ maøu

Haïng muïc Maõ maøu No.

panel ñieàu khieån Xaùm -

Motor ñieän maøu Vaøng nhaït 310

Daây daãn ñieän/ñeøn Maøu cam 557

Bôm vaø hoà chöùa Theo heä thoáng oáng töông öùng

-

Oáng gioù maøu traéng -

Caùc thieát bò khaùc Theo höôùng daãn cuûa tö vaán

10.10 DAÙN NHAÕN

Toaøn boä maùy moùc thieát bò cung caáp theo thoâng soá kyõ thuaät seõ ñöôïc daùn nhaõn baèng tieáng Anh vaø tieáng Vieät theo nhö yeâu caàu. Nhö vaäy taát caû caùc nhaõn hieäu phaûi phuø hôïp vôùi danh muïc, sô ñoà vaø seõ ñöôïc theå hieän trong baûn veõ. Nhaõn hieäu seõ vieát baèng kieåu chöõ Traffolyte maøu traéng vôùi chöõ chìm maøu ñen coù chieàu cao khoâng quaù 20mm hoaëc tröø khi coù yeâu caàu naøo khaùc ñaõ ñöôïc pheâ duyeät. Nhaõn yeâu caàu cuõng ñöôïc theå hieän trong Sô ñoà phaùc thaûo.

Nhaõn hieäu cuûa nhaø saûn xuaát thöôøng ñöôïc ñính keøm theo taát caû caùc maùy moùc, thieát bò vaø hieån thò soá seri soá kieåu daùng vaø ngaøy saûn xuaát.

Caùc chi tieát beân döôùi ñeà caäp ñeán caùc danh muïc cuï theå yeâu caàu daùn nhaõn:

● Van, boä khôûi ñoäng motor, quaït, board phaân boå, maùy ño aùp suaát, thieát bò tieáp xuùc, caùp cuoái trong tuû, caàu chì ngaét maïch

● Nhaõn seõ gaén vaøo van (hoaëc caïnh oáng) baèng mieáng kim loaïi nheï hoaëc seõ ñöôïc vaën oác ñoái nhöõng van caùch ñieän. Caùc van naøy seõ ñöôïc ñaùnh daáu soá van

● Board phaân boå, boä ñeà cuõng seõ ñöôïc gaén nhaõn ñeå chæ baùo soá maïch, pha.

Nhaõn seõ ñöôïc gaén bôûi ñinh oác hay riveâ vaøo taám kim loaïi. Gaén coá ñònh thì khoâng ñöôïc.

Chi tieát chính xaùc veà kyù töï seõ ñöôïc söï ñoàng yù cuûa tö vaán tröôùc ñeå saûn xuaát.




10.11 ÖÙNG DUÏNG CUÛA SÔN

Taát caû caùc loaïi sôn ñöôïc chuaån bò vaø söû duïng theo khuyeán caùo cuûa nhaø saûn xuaát.

Beà maët kim loaïi coù maï keõm ñöôïc sôn choáng axit ñaûm baûo coù ñoä dính chaéc chaén treân beà maët. Töøng loaïi vaät lieäu seõ theo höôùng daãn cuûa nhaø saûn xuaát sôn. Lôùp sôn tieáp theo treân beà maët cuûa kim loaïi maï keõm seõ tuaân thuû theo yeâu caàu veà Quy phaïm Kyõ thuaät naøy.

Tröôùc khi sôn, taát caû caùc beà maët kim loaïi ngoaïi tröø beà maët kim loaïi maï keõm seõ ñöôïc veä sinh saïch lôùp buïi saét gæ hoaêc queùt baèng choåi saét neáu caàn thieát ñeå loaïi boû caùc maûng saét gæ, buïi baån. Sau ñoù beà maët röûa saïch baèng dung moâi ñeå loaïi boû veát daàu môõ, buïi baån.

Beà maët ñöôïc sôn phaûi saïch vaø khoâ, moät lôùp sôn seõ phuû leân toaøn boä beà maët. Sau khi beà maët ñöôïc sôn phuû, nhaø thaàu phuï seõ thoâng baùo vôùi tö vaán ñeå kieåm tra beà maët ñaõ ñöôïc sôn ñeå tieán haønh böôùc tieáp theo sôn loùt vaø sôn hoaøn chænh.

Khi sôn phuû ñaõ ñöôïc chaáp thuaän, seõ tieán haønh sôn moät lôùp sôn loùt vaø tieáp theo phaûi ñöôïc pheâ duyeät bôûi tö vaán. Tröôùc khi sôn hoaøn taát, nhaø thaàu phuï phaûi ñaûm baûo beà maët sôn loùt phaûi phaúng vaø trôn. Cuoái cuøng hai lôùp sôn hoaøn chænh coù ñoä boùng cao, khi taát caû buïi baån loaïi boû phaûi ñöôïc kieåm ñònh bôûi tö vaán.

Phaûi ñeå khoâ töøng lôùp sôn roài môùi tieán haønh sôn lôùp keá tieáp. Ñoä daøy toái thieåu cuûa moãi lôùp sôn seõ laø 50μm.




11. THÖÛ NGHIEÄM & NGHIEÄM THU

11.1 TOÅNG QUAÙT

Khi ñöa thieát bò töø nhaø maùy ñeán coâng tröôøng, nhaø thaàu phuï phaûi trình chöùng nhaän kieåm tra ñöôïc nhaø saûn xuaát caáp cho caùc thieát bò MVAC söû duïng cho döï aùn (bao goàm caû giaáy chöùng nhaän kieåm tra chuûng loaïi). Khi hoaøn thaønh coâng trình, nhaø thaàu phuï seõ nghieäm thu heä thoáng MVAC vaø ñöa vaøo hoaït ñoäng phuø hôïp vôùi Quy phaïm Kyõ thuaät.

Sau khi baøn giao vaø tröôùc khi hoaøn taát thöïc teá, nhaø thaàu phuï seõ cung caáp caùc phöông tieän caàn thieát vaø caùc coâng cuï ñeå thöïc hieän kieåm tra nhö ñaõ neâu trong thoâng soá kyõ thuaät naøy phaûi ñöôïc chaáp thuaän cuûa tö vaán veà yeâu caàu laép ñaët ñaùp öùng caùc yeâu caàu kyõ thuaät.

Nhaø thaàu phuï ñaûm baûo coù ñuû caùc phöông tieän keå caû cho heä thoáng caáp nöôùc vaø khí ñeå thöïc hieän kieåm tra toaøn dieän vaø tieán haønh hoaït ñoäng.

Trong giai ñoaïn thaêm doõi phaùt hieän loãi kyõ thuaät, nhaø thaàu phuï seõ thöïc hieän caùc dòch vuï baûo trì toaøn dieän thöôøng xuyeân cuõng nhö dòch vuï söûa chöõa hö hoûng.

Ngoaøi ra, nhaø thaàu phuï seõ lieân laïc vôùi caùc nhaø thaàu phuï khaùc ñeå laép ñaët vaø thöïc hieän caùc hieäu chænh caàn thieát ñeå ñaûm baûo an toaøn, tin caäy vaø vaän haønh toát ñoái vôùi taát caû caùc thieát bò cung caáp trong phuï luïc hôïp ñoàng. Nhö theá vieäc hieäu chænh seõ ñöôïc thöïc hieän sau khi taát caû caùc heä thoáng ñieàu khieån ñöôïc laép ñaët vaø kieåm tra.

Nhaân söï vaän haønh thieát bò cuûa nhaø thaàu phuï phaûi ñöôïc huaán luyeän vaø coù kinh nghieäm. Nhaân söï coù naêng löïc seõ ñöôïc trình leân ñeå tö vaán pheâ duyeät.

11.2 GIAÙM SAÙT BÔÛI ÑOÄI NGUÕ KYÕ SÖ TÖØ NHAØ SAÛN XUAÁT

Caùc coâng vieäc sau seõ ñöôïc kieåm tra vaø vaän haønh bôûi ñoäi nguõ kyõ sö töø nhaø saûn xuaát

● Laép ñaët heä thoáng ñieàu khieån ● Laép ñaët heä thoáng xöû lyù nöôùc ● Laép ñaët maùy laøm laïnh

11.3 THUÛ TUÏC CHAÁP THUAÄN

Ít nhaát moät thaùng tröôùc ngaøy hoaøn thaønh coâng trình trong hôïp ñoàng phuï, nhaø thaàu phuï seõ thoâng baùo cho tö vaán baèng vaên baûn thoâng qua nhaø thaàu chính teân cuûa caùc kyõ sö laøm vieäc cuûa nhaø thaàu phuï, ai seõ hôïp taùc trong vieäc kieåm tra vaø baøn giao coâng trình ñeå tö vaán pheâ duyeät. Nhaø thaàu phuï cuõng seõ trình vaên baûn taát caû caùc quy trình kieåm tra vaø vaän haønh cho tö vaán pheâ duyeät. Vieäc kieåm tra seõ ñöôïc thöïc hieän theo yeâu caàu ñöôïc neâu ra trong phaàn khaùc cuûa Quy phaïm Kyõ thuaät naøy.

Tröø khi coù söï chaáp thuaän baèng vaên baûn cuûa tö vaán, thôøi haïn khoâng vöôït quaù 2 tuaàn cho pheùp ñieàu chænh taát caû nhöng phaûi hoaøn taát tröôùc ngaøy hoaøn thaønh coâng trình trong phuï luïc hôïp ñoàng.

Trong voøng moät thaùng sau ngaøy hoaøn thaønh coâng trình, Nhaø thaàu phuï thöïc hieän taát caû caùc vaán ñeà toàn ñoïng vaø chænh söûa loãi theo höôùng daãn, yeâu caàu cuûa tö vaán.




11.4 THÖÛ NGHIEÄM VAØ NGHIEÄM THU THIEÁT BÒ

Taát caû caùc thieát bò caàn phaûi ñöôïc thöû nghieäm vaø nghieäm thu seõ ñöôïc nhaø thaàu phuï cung caáp.

Caùc thieát bò naøy bao goàm:

● Ñoàng hoà ño aâm thanh octave ● Ñoàng hoà ño ñoä rung ● Maùy ño ñoä aåm ● Maùy ño toác ñoä ● Nhieät keá ● Maùy ño aùp keá coù oáng hôû moät ñaàu ● Boä thieát bò kieåm tra doøng chaûy cho ñoàng hoà ño doøng vaø van chænh löu keùp ● Ñoàng hoà ño söùc gioù coù chong choùng xoay baèng ñieän ● Ñoàng hoà ño vaän toác ● Am pe keá ● Voân keá ● Thieát bò kieåm tra caùp ● Maùy ghi ñoä aåm do nhieät

11.5 KIEÅM TRA TRONG SUOÁT QUAÙ TRÌNH LAÉP RAÙP

Trong töøng nôi coù lieân quan cuï theå, thieát bò seõ ñöôïc kieåm tra aùp suaát taïi xöôûng cuûa nhaø saûn xuaát toái thieåu 1-1/2 laàn aùp suaát vaän haønh trong thôøi gian khoâng quaù 2 giôø. Chöùng nhaän seõ ñöôïc laøm thaønh 3 baûn vaø chuyeån cho tö vaán.

Tröôùc khi tieán haønh caùch ñieän vaø sôn heä thoáng oáng nöôùc ñöôïc kieåm tra vôùi aùp suaát nöôùc töø 1-1/2 laàn aùp suaát vaän haønh toái ña trong heä thoáng khoâng quaù 24 giôø khoâng xaûy ra roø ræ hay suït aùp suaát. Aùp suaát vaän haønh toái ña laø ñaàu nguoàn tónh coäng vôùi ñaàu bôm toång. Aùp suaát kieåm tra toái thieåu ñoái vôùi oáng nöôùc laø 16 barô.

Kieåm tra aùp suaát seõ ñöôïc thöïc hieän ôû caùc vò trí khaùc nhau cuûa heä thoáng oáng nöôùc vaø coù söï pheâ duyeät cuûa tö vaán ñoái vôùi töøng khu vöïc kieåm tra. Vieäc kieåm tra toaøn heä thoáng seõ ñöôïc xem nhö keát thuùc.

ÔÛ nhöõng nôi maø baát kyø thieát bò naøo khoâng chaáp nhaän aùp suaát kieåm tra heä thoáng oáng toái ña, noù seõ ñöôïc taùch ra trong quaù trình kieåm tra heä thoáng oáng, sau ñoù töøng phaàn vaø töøng thieát bò seõ ñöôïc kieåm tra laïi vôùi aùp suaát thieát bò.

Ôû töøng nôi trong heä thoáng oáng ñoái vôùi nhöõng choã giaõn nôû, chuù yù khoâng vöôït quaù taûi cho pheùp. Nhöõng choã hoaëc ñöôïc buoäc chaët hoaëc thaùo ra ñeå kieåm tra aùp suaát nöôùc thay theá baèng moät mieáng ñeäm. Khi nhöõng choã giaõn nôû ñöôïc laép laïi phaàn oáng ñoù seõ ñöôïc kieåm tra laïi aùp suaát vaän haønh.

Kieåm tra aùp suaát khoâng yeâu caàu ñoái vôùi ñöôøng oáng coù vaän toác nhoû hoaëc coù aùp suaát thaáp (tröø khi ñaõ ñöôïc chæ ñònh) nhöng taát caû heä thoáng nhö theá seõ deã daøng kieåm tra nhö heä thoáng khí kín vôùi söï chöùng kieán cuûa tö vaán.

Taát caû caùc heä thoáng oáng seõ ñöôïc kieåm tra baèng tay ñeå caûm nhaän vaø thieát bò nghe ôû taát caû caùc nôi treân heä thoáng vaø nhaø thaàu phuï seõ nieâm caùc choã roø ræ baèng moät loaïi hôïp chaát ñöôïc tö vaán pheâ duyeät.




Heä thoáng coù vaän toác trung bình vaø cao ñöôïc kieåm tra aùp suaát ôû choã roø ræ khí theo yeâu caàu cuûa Association Ductwork Specification DW/143 cuûa nhaø thaàu veà heä thoáng thoâng gioù vaø khí noùng.

Boàn chöùa coù naép môû treân ñænh, bao goàm hoà chöùa nöôùc laïnh, seõ phaûi ñöôïc kieåm tra roø ræ khoûang 24 giôø.

Heä thoáng oáng laøm laïnh seõ ñöôïc kieåm tra aùp suaát tôùi 3000kpa trong khoaûng 24 giôø, söû duïng khí nitô kho hay dioxít carbon hydrid. Kieåm tra aùp suaát seõ ñöôïc thöïc hieän maùy neùn coù caùc van xaû vaø giöõ khí. Kieåm tra aùp suaát seõ thöïc hieän ngay baèng caùch ñöa chaân khoâng vaøo ñoàng thôøi töø hai phía cuûa heä thoáng ñeå möïc aùp suaát trong oáng thuyû ngaân ñaït möùc tuyeät ñoái laø 3mm (ví duï ñieåm soâi cuûa nöôùc trong heä thoáng laø döôùi 0oC) vôùi bôûi maùy neùn coù van môû vaø bôm chaân khoâng ñang vaän haønh. Caùc van trong maùy neùn sau ñoù seõ ñoùng laïi vaø bôm chaân khoâng seõ ñöôïc taùch rôøi heä thoáng. Kieåm tra chaân khoâng seõ ñaït yeâu caàu neáu aùp suaát tuyeät ñoái taêng leân trong 12 giôø khoâng vöôït quaù 4mm hieån thò treân thieát bò chæ baùo chaân khoâng chöùa thuyû ngaân. Quaù trình kieåm tra chaân khoâng hoaøn taát vaø heä thoáng seõ ñöôïc ñöôïc kieåm tra baèng chaát laøm vôùi khoûang 11,600kpa cho 12 ñôn vò carbondioxit loûng, 1000kpa cho 22 ñôn vò carbon dioxit loûng

Moãi boä bieán ñoåi nhieät daïng baûng seõ ñöôïc kieåm tra thuyû löïc khoûang 1.5 laàn vôùi ñieàu kieän aùp suaát laøm vieäc ñöôïc xaùc ñònh. Vieäc kieåm tra seõ ñöôïc thöïc hieän cho moät beân baûng ñöôïc laøm ñaày nöôùc ñeå taïo aùp suaát khoâng khí vaø maët kia seõ tieán haønh kieåm tra aùp suaát duy trì ít nhaát 30 phuùt.

11.6 NGHIEÄM THU SÔ BOÄ VAØ TIEÀN XÖÛ LYÙ

Nhaø thaàu phuï seõ ñaûm baûo taát caû caùc thieát bò trong phuï luïc hôïp ñoàng phaûi ñöôïc veä sinh, boâi trôn vaø kieåm tra ñeå söû duïng ngay tröôùc khi ñöa vaøo hoaït ñoäng.

Ñaëc bieät löu yù khi thaùo caùc thieát bò cuûa heä thoáng khí, motor, quaït, heä thoáng oáng vaø sau ñoù veä sinh cho ñeán khi ñaït yeâu caàu cuûa tö vaán.

Tröôùc khi baét ñaàu vaø sau khi kieåm tra thuyû löïc, nhaø thaàu phuï phaûi veä sinh toaøn boä thieát bò laép ñaët vaø duy trì chuùng trong ñieàu kieän môùi. Taát caû heä thoáng oáng ñöôïc doäi röûa vaø laøm khoâ ít nhaát moät laàn ñeå taåy ñi caùc chaát baån. Taát caû caùc ñöôøng oáng seõ ñöôïc duøng que ñeå taåy röûa khi caàn thieát ñeå ñaûm baûo taåy saïch caùc maûng baùm, veä sinh vaø doäi röûa seõ ñöôïc thöïc hieän ôû caùc vò trí khi laép ñaët hoaøn chænh.

Taát caû thieát bò loïc seõ ñöôïc kieåm tra vaø veä sinh saïch.

Khi toaøn boä heä thoáng ñöôïc veä sinh thì sau ñoù seõ ñöa hoaù chaát xöû lyù tröôùc vaøo vaø cho löu thoâng trong khoûang ít nhaát laø 8 tieáng. Caùc bieån baùo cuõng seõ ñöôïc cung caáp cho taát caû caùc ñaàu ra trong suoát quaù trình xöû lyù. Xöû lyù hoaù chaát seõ:

● Loaïi boû daàu môõ, chaát caën baõ laï töø ñöôøng oáng vaø töø caùc nuùt ñaäy ● Ñieàu kieän tröôùc ñoái vôùi beà maët kim loaïi laø khoâng bò phaûn öùng vôùi nöôùc

vaø khoâng khí ● Taïo moät lôùp maøng baûo veä ban ñaàu

Trong quaù trình doäi röûa, thieát bò seõ ñöôïc taùch rôøi vaø heä thoáng seõ bieät laäp hoaøn toaøn vôùi baát kyø heä thoáng khaùc ñeå ñaûm baûo khoâng bò vaáy baån.




Xöû lyù hoaù chaát vaø doäi röûa theâm seõ ñöôïc thöïc hieän treân heä thoáng bieät laäp baèng caùch keát noái vôùi bôm söû duïng ñoäng cô diesel taïm thôøi ñöa nuôùc vaø löôïng hoaù chaát vaøo. Nhaø thaàu phuï ñöôïc pheùp keát noái cheùo heä thoáng oáng vaøo vaø ra taïi nhöõng nôi xa vaø taïi caùc vò trí giao dieän vôùi keát noái hieän taïi.

Sau khi xöû lyù, heä thoáng seõ ñöôïc laøm khoâ bôm nöôùc laïi baèng nöôùc saïch/nöôùc laïnh vaø chôø cho ñeán khi heä thoáng ñi vaøo hoaït ñoäng.

Chi tieát vaø quy trình xöû lyù seõ ñöôïc trình cho tö vaán.

Trong quaù trình kieåm tra vaø veä sinh ban ñaàu cho caùc thieát bò daãn khí, thieát bò loïc taïm thôøi seõ ñöôïc ñöa vaøo ñeå veä sinh cuoän daây vaø quaït ñöa khoâng khí vaøo.

Ñieàu khieån töï ñoäng vaø thieát bò an toaøn seõ ñöôïc kieåm tra tröôùc khi ñöa chaát loûng hay doøng ñieän vaøo heä thoáng söû duïng.

11.7 THÖÛ NGHIEÄM TAÏI XÖÔÛNG

Coâng taùc thöû nghieäm taïi xöôûng ñöôïc thöïc hieän bôûi nhaø thaàu phuï veà thieát bò taïi xöôûng cuûa nhaø saûn xuaát hoaëc taïi ñòa ñieåm naøo khaùc thích hôïp.

Nhaø thaàu phuï seõ thoâng baùo vôùi tö vaán ít nhaát 4 tuaàn tröôùc ngaøy kieåm tra. Nhaø thaàu phuï cuõng seõ cung caáp phöông tieän caàn thieát vaø choã ôû (neáu coù yeâu caàu) cho ít nhaát 2 ñaïi dieän cho ngöôøi chuû thaàu chính vaø 2 ñaïi dieän cho tö vaán coù maët vaø nhaân chöùng cho vieäc thöû nghieäm taïi xöôûng. Trong 2 tuaàn sau khi hoaøn taát vieäc thöû nghieäm, 3 boä baùo caùo veà vieäc kieåm thöû nghieäm (ñöôïc kyù taïi hieän tröôøng kieåm tra vaø coù chöõ kyù cuûa nhaân chöùng) seõ ñöôïc trình cho tö vaán ñeå pheâ duyeät.

Caùc danh muïc thieát bò sau seõ ñöôïc thöû nghieäm taïi xöôûng cuûa nhaø saûn xuaát.

(a) Quaït

“Loaïi ñöôïc kieåm tra” ñoái vôùi quaït coù ñöôøng ñaëc tuyeán, (BS48 phaàn 1, phöông phaùp kieåm tra thích hôïp) chöùng nhaän cho loaïi quaït ñöôïc kieåm tra veà möùc tieâu hao naêng löôïng toát ( BS 48 phaàn 2)

(b) Bôm

“Loaïi ñöôïc kieåm tra” coät aùp ñaåy, toác ñoä vaø ñieän caáp vaøo BS 599, ñoái vôùi bôm coù motor coâng suaát 40kw kieåm tra taïi nhaø maùy cho töøng loaïi bôm yeâu caàu veà hieäu suaát.

(c) Moâtô ñieän

Loaïi ñöôïc kieåm tra theo yeâu caàu cuûa BS5000. Ñoái vôùi bôm coâng suaát 40kw ñaàu ra, vieäc kieåm tra taïi nhaø maùy theo BS 5000 cho töøng loaïi motor yeâu caàu veà hieäu suaát.

(d) Boä ñeà vaø hoäp soá ñieàu khieån

Loaïi ñöôïc kieåm tra (BS578) cho caùc panel ñieàu khieån kieåm tra ñieän aùp cao theo BS 587

(e) Tuû ñieän phuïc vuï cô khí (MSSB)

Kieåm tra taïi nhaø maùy seõ ñöôïc thöïc hieän vôùi söï coù maët cuûa tö vaán caùc muïc sau:

● Kieåm tra maïch chính bao goàm daây daãn, keát noái cô hoïc, ñieän ● Kieåm tra cô hoïc




● Kieåm tra caân chænh caùc maïch ñieàu khieån vaø caùc linh kieän ● Kieåm tra ñieän moâi vaø söï lieân tuïc ● Kieåm tra aùp suaát taàn soá nguoàn ● Kieåm tra chöùc naêng cuûa löôùi ñieän ñieàu khieån

(f) Van vaø phuï kieän

Loaïi ñöôïc kieåm tra veà aùp suaát vaø thieát bò phuï theo quy ñònh cuûa cô quan caáp thoaùt nöôùc ñòa phöông.

(g) Thieát bò ñieàu khieån khoâng khí vaø cuoän daây trong quaït

Kieåm tra veà coâng suaát laïnh, löu löôïng gioù, coät aùp quaït vaø döõ lieäu veà aâm hoïc. Kieåm tra aùp suaát cho daøn laïnh taïi nhaø maùy

11.8 THÖÛ NGHIEÄM VAØ NGHIEÄM THU TAÏI COÂNG TRÖÔØNG

(a) Toång quaùt

Moät thaùng tröôùc ngaøy hoaøn taát coâng trình, nhaø thaàu phuï giöõ lieân laïc vôùi nhaø thaàu chính vaø nhaø thaàu phuï cô ñieän khaùc vaø ñeä trình baûn chöông trình chi tieát cho nhaø tö vaán ñeå pheâ duyeät tieán haønh kieåm tra nghieäm thu vaø chuyeån giao treân coâng tröôøng.

Vieäc kieåm tra chia laøm 2 phaàn. Kieåm tra nghieäm thu chöùng minh vieäc laép ñaët theo thoâng soá kyõ thuaät, vaän haønh vaø ñieàu khieån oån ñònh vaø kieåm tra vaän haønh ñeå kieåm tra vieäc laép ñaët theo ñuùng ñieàu kieän yeâu caàu.

Kieåm tra nghieäm thu seõ ñöôïc thöïc hieän ngay khi chuyeån giao hoaøn taát, tuy nhieân nhaø thaàu phuï seõ ñöôïc yeâu caàu tieán haønh kieåm tra tính naêng trong naêm hoaït ñoäng ñaàu tieân laø theå hieän ñieàu kieän taûi toái ña.

Nhaø thaàu phuï seõ khôûi ñoäng, hoaït ñoäng, kieåm tra vaø ñieàu chænh heä thoáng theo chöông trình thoûa thuaän tröôùc. Vieäc caøi ñaët seõ ñöôïc ñaïi dieän cuûa nhaø saûn xuaát giaùm saùt, laø ngöôøi luoân coù maët taïi coâng trình cho ñeán khi nhöõng thieát bò hoaït ñoäng ñaùp öùng yeâu caàu cuûa nhaø tö vaán vaø ñöôïc nhaø tö vaán chaáp thuaän. Nhaø thaàu phuï seõ thoâng baùo vaø hôïp taùc vôùi ñaïi dieän cuûa nhaø saûn xuaát ñeå caùc cuoäc kieåm tra ñöôïc tieán haønh theo tieán ñoä ñaõ ñöôïc thoûa thuaän.

Toaøn boä heä thoáng seõ ñöôïc thöû nghieäm, nghieäm thu nhö laø moät phaàn chi tieát lieân quan trong Quy phaïm kyõ thuaät.

Toaøn boä vieäc laép ñaët seõ ñöôïc thöïc hieän sau caùc cuoäc kieåm tra ñeå ñöa maùy vaøo hoaït ñoäng. Nhaø tö vaán seõ thoâng baùo cuøng vôùi moät baûn sao ghi cheùp caùc keát quaû kieåm tra, noùi chung khoâng ít hôn baûy ngaøy, veà tính chaát cuûa caùc cuoäc kieåm tra, thôøi gian vaø ñòa ñieåm. Kieåm tra nghieäm thu chæ coù nhaø tö vaán chöùng kieán khi keát quaû kieåm tra ñeä trình ñaùp öùng yeâu caàu.

Caùc thieát bò, duïng cuï, vaät tö vaø nhaân coâng yeâu caàu cho vieäc tieán haønh caùc cuoäc kieåm tra naøy seõ do nhaø thaàu phuï cung caáp.

Neáu keát quaû kieåm tra cho thaáy raèng maùy moùc vaø thieát bò khoâng hoaït ñoäng theo ñuùng chöùc naêng ñaùp öùng yeâu caàu cuûa Quy phaïm kyõ thuaät, nhaø tö vaán seõ thoâng baùo lieäu ñoù laø do loãi khoâng ñuùng cuûa nhaø thaàu phuï hay khoâng vaø neáu ñoù ñuùng laø loãi cuûa nhaø thaàu phuï, thì khi ñöôïc yeâu caàu, nhaø thaàu phuï seõ söûa chöõa, thay theá baèng chi phí cuûa mình.




Baùo caùo kieåm tra goàm nhöõng phaàn sau:

(i) Trang tieâu ñeà vôùi teân vaø ñòa chæ cuûa caùc beân coù lieân quan vaø ngaøy baùo caùo

(ii) Toùm taét chuù giaûi cho: ● Thieát keá öùng hoaït ñoäng cuoái cuøng vôùi nhöõng ghi chuù giaûi thích chi

tieát taïi sao hoaït ñoäng cuoái cuøng laïi khaùc ● Kyù töï ghi chuù cuûa heä thoáng ● Chuoãi hoaït ñoäng heä thoáng

(iii) Baûn thuaät ngöõ cho maõ thieát bò vaø döõ lieäu kyõ thuaät

(iv) Ñieàu kieän kieåm tra vôùi döõ lieäu cho: ● Caøi ñaët van gioù, truyeàn ñoäng quaït, caùnh quaït ● Ñieàu kieän cuûa boä loïc vaø daøn laïnh ● Caøi ñaët boä ñieàu chænh aùp suaát khí tónh

(b) Thieát bò Chiller

Tieán trình chuyeån giao seõ theo quy ñònh cuûa Tieâu chuaån Höôùng daãn maõ chuyeån giao CIBSE series R vaø ASHRAE.

Nhaø thaàu phuï seõ thöïc hieän vieäc chuyeån giao cuøng vôùi nhaø thaàu phuï maùy laøm nguoäi.

Phaûi ghi cheùp laïi nhöõng döõ lieäu sau ñaây trong baûn chuyeån giao (danh saùch thieát keá vaø thöïc teá cho moãi loaïi thieát bò).

Tröôùc khi baét ñaàu khôûi ñoäng maùy laøm nguoäi ñeå tieán haønh kieåm tra, chuyeân gia maùy laøm nguoäi seõ kieåm tra söï roø ró cuoái cuøng vaø naïp chaát ñoâng laïnh cuõng nhö daàu boâi trôn.

Heä thoáng ñieän: nhaø thaàu phuï seõ tieán haønh thöïc hieän caùc cuoäc kieåm tra sau. ● Choáng caùch ñieän – töøng phaàn vaø toaøn boä ● Tieáp ñaát ● Choáng lieân tuïc trong caùc chaát daãn vaø lôùp boïc ngoaøi töøng phaàn vaø toaøn

boä ● Ñònh pha goàm leäch pha khoâng vöôït quaù 10% ● Kieåm tra taám nhaõn ñieän aùp ñoäng cô vaø ñieän aùp vaøo ● Kieåm tra söï quay voøng vaø toác ñoä cuûa ñoäng cô tröôùc khi noái vôùi maùy daãn

ñoäng ● Doøng ñieän taûi ñaày ñuû ôû moãi pha vaø tieâu thuï ñieän naêng ● Kieåm tra vieäc caøi ñaët thieát bò ngaét quaù taûi baèng nhieät vaø ghi cheùp caøi ñaët ● Kieåm tra caøi ñaët thieát bò ngaét quaù taûi vaø ghi cheùp ● Caùc maïch phaûi laø MEGGERED

Nhöõng döõ lieäu sau ñaây phaûi ñöôïc ghi cheùp laïi trong baûn chuyeån giao:

● Löu löôïng nöôùc laïnh vaø nhieät ñoä nöôùc hoài ● Ñoä suït aùp qua bình bay hôi




● Ñoä suït aùp qua bình ngöng ● Löu löôïng quaït bình ngöng, suït aùp ● Nhieät ñoä, aùp suaát cuûa moâi chaát laïnh taïi ñaàu huùt vaø ñaàu ñaåy ● Aùp suaát neùn daàu ● Maùy neùn vaø toác ñoä ñoäng cô ● Vaän haønh an toaøn vaø caøi ñaët aùp suaát cao, aùp suaát thaáp vaø caàu chì ngaét

aùp suaát daàu vaø caùc thieát bò an toaøn khaùc ● Caáu hình saép xeáp ñoäng cô neáu coù ● Doøng ñieän hoaït ñoäng ôû 100%, 75%, 50%, 25% vaø 15% ● Nhöõng yeâu caàu khaùc ñöôïc quy ñònh trong baûn thoâng soá kyõ thuaät cho

maùy laïnh ● Kieåm tra tieáng oàn cho maùy laïnh seõ ñöôïc tieán haønh theo yeâu caàu quy

ñònh trong phaàn “Ñieàu khieån tieáng oàn vaø ñoä rung” cuûa thoâng soá kyõ thuaät

Nhaø thaàu phuï seõ thöïc hieän kieåm tra aâm thanh vaø ño aùp löïc aâm thanh phaûi laø 1.5m gaàn treân saøn nhaø vaø 2.0m töø maùy laïnh.

Ño bieân ñoä rung ñeå ñaûm baûo chuùng trong phaïm vi maø nhaø saûn xuaát khuyeán caùo.

(c) AHU vaø oáng gioù

Caùc quy trình chuyeån giao seõ tuaân theo quy ñònh cuûa Tieâu chuaån Höôùng daãn maõ chuyeån giao CIBSE series A ASHRAE 111-1988 (phaàn 6, 8 vaø 10), Taäp höôùng daãn BSRIA laép ñaët maùy ñieàu hoøa nhieät ñoä. Nhaø thaàu phuï laøm can xöùng caùc maùy khuyeách taùn khí vaø löôùi baèng caùch cung caáp boä giaûm aâm.

Nhöõng döõ lieäu sau ñaây phaûi ñöôïc ghi cheùp laïi trong baûn chuyeån giao:

● Nhieät ñoä baàu khoâ vaø baàu öôùt ■ Ñieàu kieän moâi tröôøng ■ Trong caùc khoâng gian söû dung ■ Taïi ñaàu caáp vaø ñaàu hoài cuûa oáng gioù ■ Tröôùc vaø sau daøn laïnh

● Löu löôïng nöôùc vaø giaûm aùp suaát qua daøn laïnh ● Nhieät ñoä nöôùc ra vaøo vaø cheânh nhieät ñoä nöôùc qua daøn laïnh ● Toång aùp suaát tónh, aùp suaát ñaåy vaø aùp suaát huùt tónh cuõng nhö löu löôïng

gioù cho quaït hay caùc AHU ● Löu löôïng gioù töôi vaø hoài cuûa töøng quaït hay AHU ● Löu löôïng gioù vaø trôû löïc qua töøng maùy chính nhö loïc, daøn laïnh ● Löu löôïng gioù taïi oáng gioù caáp vaø oáng gioù thaûi vaø taïi caùc mieäng gioù caáp,

thaûi vaø hoài cuõng nhö nhöõng thieát bò töông töï ● Vò trí cuûa van gioù treân ñöôøng gioù töôi vaø gioù hoài ● Quaït vaø toác ñoä ñoäng cô ● Doøng ñieän khôûi ñoäng vaø vaän haønh cho töøng ñoäng cô

Baûn baùo caùo chuyeån giao cuõng goàm nhöõng döõ lieäu thieát bò nhö sau:




(i) Quaït

● Saûn xuaát/ loaïi ● Kieåu soá/ kích thöôùc ● Soá seri ● Laép raùp/ loaïi ● Ñaàu ñaåy ● Con laên coù raõnh ● Kích thöôùc con laên/ noøng ● Daây curoa/ saûn xuaát/ kích thöôùc ● Thieát bò loïc/ loaïi/ kích thöôùc

(ii) Ñoäng cô

● saûn xuaát/ khung ● KW/RPM ● Voân/ pha/ Hz ● Ampe taûi toång coäng ● Con laên coù raõnh ● Kích thöôùc con laên/ noøng ● Khoaûng caùch trong con laên vaø ñieàu chænh

(iii) Daøn laïnh

● Saûn xuaát/ loaïi ● Kieåu/ kích thöôùc ● Daõy/ söôøn ● Maët ● Kích thöôùc oáng ● Vaät tö oáng/ söôøn ● Maïch

(iv) Thieát bò gioù

● Heä thoáng/ thieát bò soá ● Vò trí/ khu vöïc ● Thieát bò kieåm tra ● Khu vöïc phuïc vuï ● Soá hieäu thieát bò gioù ● Loaïi/ kieåu ● Kích thöôùc ● Kích thöôùc thieát bò ñaàu cuoái ● AK/ hieäu suaát thieát bò khí




Moãi quaït ñöôïc kieåm tra sau khi laép ñaët vaø toác ñoä quaït ñöôïc ñieàu chænh gaàn vôùi löu löôïng gioù thieát keá. Sau khi ñieàu chænh ñaàu ra vaø caân baèng nhöõng heä thoáng khaùc nhau, thöïc hieän kieåm tra cuoái cuøng cho löu löôïng, aùp suaát tónh vaø ñieän naêng. Löôïng löôïng gioù khoâng ñöôïc thaáp hôn nhö ñaõ ñònh roõ vaø khoâng lôùn hôn 10% nhöõng thoâng soá ñaõ neâu treân hay baát cöù soá naøo ñaõ ñöôïc chaáp thuaän.

Caùc ñaàu ra, mieäng gioù seõ ñöôïc ñieàu chænh ñaàu tieân ñeå cho moät löu löôïng gioù theo baûn veõ vôùi dung sai laø + hay – 10%.

Ngoaøi nhöõng caøi ñaët luùc ñaàu, nhaø thaàu phuï seõ thöïc hieän ñieàu chænh theâm cho phaàn phaân phoái gioù maø coù theå ñöôïc yeâu caàu ñeå ñaûm baûo nhieät ñoä ñeàu, khaû naêng chuyeån ñoäng töø boä phaän thoâng gioù qua caùc khu vöïc ñieàu hoøa vaø thoâng gioù thích hôïp.

Nhaø thaàu phuï seõ ñaët töøng baûn veõ coù ñaùnh daáu chæ ra löu löôïng gioù ñöôïc ño cho töøng:

● Mieäng gioù hoài, thaûi vaø töông töï ● Oáng chính vaø töøng oáng nhaùnh chính nhö ñaõ chæ ñònh ● AHU hay quaït. Toång löu löôïng gioù cho caùc thieát bò ñieàu hoøa khoâng khí

seõ ñöôïc ño vôùi löu löôïng thieát keá qua daøn laïnh vaø van gioù caøi ñaët ôû cheá ñoä toái öu. Van gioù töôi vaø gioù hoài ñöôïc ñieàu chænh ñeå ñaùp öùng löu löôïng gioù nhö theå hieän treân baûn veõ thieát keáõ

Caàn ñaëc bieät löu yù raèng toång löu löôïng gioù cho töøng heä thoáng trong khoaûng dung sai cho pheùp -0, +10%. Con soá naøy phaûi ñöôïc laäp toái thieåu ba phöông phaùp ño ñaïc theo trình töï sau:

● Thanh ngang hôû ñaàu trong oáng cung caáp chính theo tieâu chuaån BS 1042 – 1943

● Giaûm aùp suaát thöïc teá so vôùi tyû leä giaûm aùp suaát gioù cuûa nhaø saûn xuaát qua daøn laïnh vaø/ hay daøn söôûi (hieäu suaát ARI)

● Toång löu löôïng gioù ño ñöôïc taïi caùc ñaàu ra vôùi heä soá chính xaùc aùp duïng theo döõ lieäu cuûa nhaø saûn xuaát ñoái vôùi phöông phaùp ño ñaëc bieät

● Phöông phaùp ño baèng thieát bò ño gioù coù theå thöïc hieän 25mm ôû ñaàu ra vaø trung bình cho toaøn khu vöïc cuûa thieát bò loïc hay daøn laïnh, vôùi heä soá chính xaùc ñöôïc aùp duïng (heä soá thöôøng laø 0.8 x soá ñoïc ñöôïc treân thieát bò ño gioù ñeå coù ñöôïc löu löôïng gioù thöïc teá)

● Löôïng tieâu thuï ñieän thöïc teá cuûa quaït so vôùi löôïng tieâu thuï ñieän theo mong ñôïi ôû coâng suaát xaùc ñònh (nhaø thaàu phuï seõ kieåm tra kích thöôùc vaø ñoä hôû cuûa quaït theo baûn veõ cuûa nhaø saûn xuaát, cuõng nhö tính toaùn chính xaùc möùc tieâu thuï ñieän ñoái vôùi heä soá naêng löôïng vaø hieäu suaát ñoäng cô vaø hieäu suaát truyeàn ñoäng daây ñai. Nhaø thaàu phuï cuõng seõ kieåm tra heä thoáng choáng tónh thöïc teá theo mong ñôïi)

Toång löu löôïng gioù seõ ñöôïc chöùng minh sau khi heä thoáng phaân phoái ñöôïc caân baèng.




Ñeå kieåm tra söï phaân phoái gioù ñeán caùc khu vöïc vaø ñaàu ra, toång löôïng gioù chaáp thuaän trong khoaûng dung sai ± 5% töø löu löôïng gioù yeâu caàu. Coù theå söû duïng khoái löôïng ñoïc tröïc tieáp ñeå laøm caân baèng sô boä vaø ñieàu chænh löu löôïng gioù taïi ñaàu ra. Tuy nhieân, neáu söû duïng thieát bò ñaàu ra khaùc nhau (nhö van xaû beân, boä khuyeách taùn traàn, khe tuyeán vaø töông töï) vaø khoâng theå söû duïng cuøng phöông phaùp ño löôøng cho töøng ñaàu ra. Söû duïng thieát bò ño gioù ñònh côõ ñeå ño löu löôïng gioù cuoái cuøng taïi caùc ñaàu ra vaø caùc daøn laïnh, daõi loïc gioù, ñaàu laáy gioù töôi vaø töông töï. Söû duïng nhöõng naép che ñaëc bieät ñeå ño löôïng khí cho boä khuyeách taùn tuyeán tính. Neáu söû duïng caùc chuïp kích thöôùc khaùc nhau, coù theå aùp duïng nhöõng heä soá khaùc nhau ñöôïc chaáp thuaän. Neáu söû duïng cuøng loaïi chuïp nhöng löu löôïng gioù vaø/ hay kích thöôùc boä khuyeách taùn khaùc nhau thì giôùi haïn cho pheùp seõ ñöôïc aùp duïng cho nhöõng heä soá chuïp.

Oáng hôû moät ñaàu hay dung löôïng ñoïc tröïc tieáp vôùi maùy doø khe hôû seõ ñöôïc söû duïng ñeå ño löu löôïng gioù trong oáng vaø caên cöù vaøo möùc trung bình cuûa soá ñoïc khoâng quaù 300mm trung taâm vaø khoâng nhoû hôn moät soá ghi treân 0.1m2 cuûa maët caét cuûa oáng.

Ngoaøi vieäc phaân boå gioù töø vieäc cung caáp gioù ñaàu ra seõ ñöôïc kieåm tra vaø ñieàu chænh caàn thieát ñeå ñaûm baûo höôùng vaø “bieân ñoä” cuûa gioù thích hôïp vôùi vieäc söû duïng vaø ñoàng boä beà maët cuûa töøng ñaàu ra.

Vieäc ñieàu chænh löu löôïng gioù seõ ñöôïc thöïc hieän baèng caùch giaûm aùp suaát qua van gioù taïi hay gaàn caùc maët cuûa ñaàu ra laø toái thieåu coù theå. Ñoä suït aùp suaát theo yeâu caàu ñeå haïn cheá löu löôïng trong caùc nhaùnh thaáp nhö nhöõng doøng chaûy ngaén gaàn quaït chuû yeáu tröôùc tieân baèng caùch söû duïng van gioù taïi ñieåm reõ nhaùnh ôû oáng chính. Ñieàu chænh truyeàn ñoäng cuûa quaït coù theå ñieàu chænh löu löôïng gioù taïi toác ñoä quaït toái thieåu vôùi vieäc söû duïng toái thieåu van gioù ôû trôû löïc cao nhaát cuûa ñöôøng oáng.

Cuoäc kieåm tra sau ñaây vaø nhöõng cuoäc kieåm tra khaùc cuõng ñöôïc yeâu caàu theo söï höôùng daãn cuûa caûnh saùt chöõa chaùy hay caùc cô quan coù thaåm quyeàn khaùc.

(d) Heä thoáng nöôùc

Caùc quy trình chuyeån giao seõ tuaân theo quy ñònh cuûa Höôùng daãn maõ chuyeån giao CIBSE series W vaø ASHRAE 111-1988 phaàn 6, 9 vaø 11.

Caùc heä thoáng nöôùc seõ ñöôïc ñieàu chænh vaø caân baèng ñuùng löu löôïng yeâu caàu baèng van ñieàu chænh.

Phaûi ghi cheùp nhöõng döõ lieäu sau ñaây vaøo baûn chuyeån giao:

● Toác ñoä ñoäng cô bôm tuaàn hoaøn ● Coät aùp khi bôm taét, ñöôøng kính roâto thöïc teá, coät aùp khi thieát bò môû

100%, löu löôïng 100%, aùp suaát ñaàu ñaåy cuoái cuøng, aùp suaát huùt cuoái cuøng, coät aùp toång vaø löu löôïng cho töøng loaïi bôm

● Aùp suaát taïi caùc nhaùnh chính ● Löu löôïng nöôùc qua thieát bò chính ● Nhieät ñoä nöôùc caáp vaø hoài veà cuûa töøng daøn laïnh ● Doøng ñieän khôûi ñoäng vaø hoaït ñoäng cuûa töøng ñoäng cô maùy bôm




● Giaûm aùp suaát nöôùc qua töøng phaàn cuûa thieát bò thuûy löïc, nhö daøn laïnh, van ñieàu khieån, thieát bò loïc vaø töông töï

Baûn chuyeån giao cuõng bao goàm nhöõng döõ lieäu sau ñaây cho maùy bôm:

● Vò trí/ nhieäm vuï ● Saûn xuaát ● Kieåu soá ● Seri soá ● Löu löôïng nöôùc ● NPSH yeâu caàu ● Toác ñoä maùy bôm voøng/phuùt ● Ñöôøng caùnh bôm ● Haõng saûn xuaát/ khung ñoäng cô ● Voân/ pha/ Hz ● Maùy bôm taûi troïng ñaày ñuû ● Loaïi bít kín

Nhaø thaàu phuï seõ kieåm tra vaø ñieàu chænh löu löôïng nöôùc trong phaïm vi dung sai cho pheùp:

● Maùy bôm: -0% to +20% ● Daøn laïnh: -5% to +20%

Heä thoáng phaûi ñöôïc caân baèng vôùi van ñieàu khieån hoaøn toaøn môû vaø löôïng nöôùc seõ ñöôïc xaùc ñònh töø vieäc giaûm aùp suaát qua van ñieàu khieån vaø heä soá löu löôïng do nhaø saûn xuaát chæ ñònh.

Nhaø thaàu phuï seõ ghi cheùp caùc keát quaû kieåm tra vaø noäp baùo caùo cho nhaø tö vaán theå hieän nhöõng thoâng tin sau.

● Löu löôïng nöôùc ño ñöôïc, söï giaûm aùp suaát qua van ñieàu khieån vaø heä soá löu löôïng cho töøng loaïi van

● Nhieät ñoä nöôùc vaøo vaø ra taïi töøng haïng muïc cuûa thieát bò vaø ñöôïc tính toaùn coâng suaát nhieät hay laïnh

● Nhieät ñoä nöôùc vaøo vaø ra vaø löôïng nöôùc qua töøng daøn laïnh trong caùc thieát bò ñieàu hoøa khoâng khí chính, ñöôïc ño cuøng luùc nhö muïc (5) vaø toång coâng suaát laøm laïnh ñöôïc tính toaùn

Thoâng soá ño Aùp suaát ñaàu huùt vaø ñaàu ñaåy taïi moãi maùy bôm seõ ñöôïc ñaùnh daáu troøn treân baûng ñöôøng cong ñaëc tuyeán bôm cuûa nhaø saûn xuaát cho bieát löu löôïng nöôùc ñöôïc chuyeån ñeán.

(e) Heä thoáng ñieàu khieån

Nhaø thaàu phuï ñaûm baûo vieäc ñieàu khieån töï ñoäng ñöôïc chuyeån giao vaø kieåm tra. Nhìn chung, quy trình chuyeån giao tuaân theo ñieàu khoaûn töông öùng neâu trong baûn höôùng daãn chuyeån giao CIBSE series C.

Nhaø thaàu phuï seõ xaùc ñònh caùc phaïm vi ñieàu chænh vaø caøi ñaët ñieåm cho caùc van töï ñoäng, caûm bieán aùp suaát vaø töông töï ñeå ñaûm baûo ñieàu kieän hoaït ñoäng chính xaùc. Thôøi gian vaø ñieàu khieån cuõng phaûi ñöôïc kieåm tra vaø xaùc nhaän.




Caùc van, coâng taéc, thieát bò ñieàu khieån phaûi ñöôïc ñieàu chænh thích hôïp.

Maïch lieân ñoäng vaø thieát bò an toaøn cuõng seõ ñöôïc kieåm tra ñeå ñaûm baûo maùy moùc hoaït ñoäng an toaøn.

(i) Kieåm tra daây

● Heä thoáng daây trong baûn ñieàu khieån phaûi ñöôïc kieåm tra tröôùc khi thaùo ra ñeå noái, ngaét vaø ñuùng vôùi sô ñoà daây. Ngoaøi ra phaûi tieán haønh kieåm tra chöùc naêng ñeå ñaûm baûo caùc khoùa lieân ñoäng vaø chuoãi thöù töï theo yeâu caàu thöïc haønh cuûa thoâng soá kyõ thuaät

● Moãi daây caùp truyeàn daãn noái vôùi traïm cuïc boä vaø traïm beân ngoaøi phaûi ñöôïc kieåm tra cuï theå. Phaàn caùch ñieän cho töøng daây caùp truyeàn daãn seõ ñöôïc kieåm tra ñeå ñaït treân 10 M ohm

● Daây ôû töøng ñieåm ñaàu ra, traïng thaùi ñaàu vaøo, ñaàu vaøo vaø ñaàu ra tuyeán tính seõ ñöôïc kieåm tra vaø söûa chöõa ñeå ñaùp öùng theo baûn veõ do nhaø tö vaán pheâ duyeät

(ii) Kieåm tra phaàn cöùng

Caùc phaàn cöùng phaûi ñöôïc kieåm tra ñeå baûo ñaûm chöùc naêng cuûa noù. Caàn caøi ñaët moät chöông trình ñôn giaûn vaø maùy vi tính, heä thoáng daây lieân laïc ngoaïi bieân vaø töông töï phaûi ñöôïc kieåm tra bôûi ñaàu vaøo vaø baèng phöông phaùp phuø hôïp. Caùc phaàn cuûa phaàn cöùng phaûi ñöôïc kieåm tra kyõ moïi chöùc naêng cuûa chuùng. Baát cöù khuyeát ñieåm naøo cuûa phaàn cöùng seõ ñöôïc thay theá vaø khoâng ñöôïc söûa chöõa.

(iii) Kieåm tra phaàn meàm

Sau khi caùc phaàn cöùng ñaõ ñöôïc xaùc ñònh ñuùng chöùc naêng, toaøn boä phaàn meàm ñöôïc cung caáp phaûi ñöôïc caøi ñaët vaø kieåm tra. Thieát bò töông töï cuõng nhö ñaàu ra kyõ thuaät soá seõ do nhöõng boùng ñeøn yeáu hay ñoäng cô nhoû kieåm tra. Phaûi kieåm tra chöùc naêng cuûa caùc phaàn meàm. Moïi “truïc traëc” trong phaàn meàm phaûi ñöôïc “gôû loãi”. Hai ñóa chöông trình phaàn meàm seõ ñöôïc cung caáp ñeå sao löu trong tröôøng hôïp phaàn meàm bò hö hoûng trong khi söû duïng hay bò maát.

(iv) Kieåm tra boä chuyeån ñoåi

Caùc boä chuyeån ñoåi ñaàu vaøo vaø ra seõ ñöôïc kieåm tra noái vôùi thieát bò ñieän vaø cô. Caùc boä chuyeån ñoåi cho caùc ñaàu kyõ thuaät soá ñöôïc caøi ñaët vôùi nhöõng trò soá taét/ môû thích hôïp vaø caùc boä chuyeån ñoåi cho nhöõng ñieåm töông töï cuõng coù söï phaûn öùng voøng troøn ñöôïc kieåm tra baèng phöông phaùp ño ñaïc ôû toái thieåu 10 ñieåm.

(v) Kieåm tra heä thoáng

Heä thoáng ATC seõ ñöôïc kieåm tra toaøn boä cuøng vôùi boä chuyeån ñoåi ñaàu vaøo vaø ra noái vôùi DDCs hay boä giao tieáp. Chöùc naêng ñieàu khieån vaø giaùm saùt chính seõ ñöôïc kieåm tra toái thieåu hai laàn.




(f) Kieåm tra ñieän

Sau khi laép ñaët tuû ñieän treân coâng tröôøng vaø tröôùc khi kieåm tra thieát bò, phaûi tieán haønh nhöõng cuoäc kieåm tra sau vôùi söï coù maët cuûa nhaø tö vaán .

● Kieåm tra baûng ñieàu khieån ● Kieåm tra cô hoïc ● Kieåm tra tính lieân tuïc vaø chaát ñieän moâi ● Kieåm tra chöùc naêng ● Kieåm tra noái ñaát

Khi hoaøn taát caùc cuoäc kieåm tra treân, nhaø thaàu phuï seõ chuyeån giao baûn ñieàu khieån khoâng taûi vaø tieán haønh thöïc hieän caùc cuoäc kieåm tra sau:

● Kieåm tra voân töø pha ñeán pha vaø töø pha ñeán vò trí soá khoâng ● Kieåm tra chuoãi pha ôû moãi maïch ra

Nhaø thaàu phuï phaûi thöïc hieän caùc cuoäc kieåm tra sau theo yeâu caàu I.E.E vôùi söï coù maët cuûa nhaø tö vaán:

● Kieåm tra chieàu phaân cöïc ● Kieåm tra tính caùch ñieän cuûa caùc daây caùp ñieän vaø ñieàu khieån ● Kieåm tra tính caùch ñieän cuûa caùc caùnh ñoäng cô ● Kieåm tra tính daãn ñieän lieân tuïc ● Kieåm tra hieäu quaû noái ñaát ● Caùc rôøle quaù taûi baèng nhieät vaø boä khôûi ñoäng ● Chuoãi hoaït ñoäng

Kieåm tra ñoäng cô, nhaø thaàu phuï seõ tieán haønh caùc cuoäc kieåm tra sau ñaây treân caùc ñoäng cô ñieän vaø caáp hai baûn xaùc nhaän kieåm tra:

● Kieåm tra voân ñoäng cô ● Kieåm tra voøng quay vaø toác ñoä ñoäng cô tröôùc khi noái vôùi maùy truyeàn

ñoäng ● Xaùc ñònh kW toái thieåu do quaït haáp thuï taïi ñieåm aùp suaát/ khoái löôïng cao

nhaát theo toác ñoä quaït ñaõ ñònh ● Vaønh ñai lieân tuïc noái ñaát cho moãi boä khôûi ñoäng ñoäng cô ● Caùch ñieän cho moãi boä khôûi ñoäng ñoäng cô 500V ● Doøng ñieän taûi hoaøn toaøn bôûi caùc ñoäng cô trong töøng pha ● Thôøi gian nhaû maùy cuûa boä khôûi ñoäng quaù taûi ñöôïc caøi ñaët töø 10% trôû

leân (neáu nhieät noùng)

Vieäc dieãn giaû töøng coâng vieäc ñieàu khieån theo thoâng soá kyõ thuaät (nhö coâng taéc choïn daây ñuùng, caàu chì maïch cao hay thaáp, coâng taéc möùc).

● Kieåm tra nhieät ñoä ñoäng cô (theo tieâu chuaån BS 4999) ● Kieåm tra doøng ñieän khôûi ñoäng cuûa caùc ñoäng cô




(g) Söï ño ñaïc vaø kieåm tra khaùc

Nhieät ñoä vaø ñoä aåm vaø möùc ñoä oàn trong phoøng seõ ñöôïc ño ñeå ñaûm baûo ñaït ñöôïc theo ñieàu kieän thieát keá. Thieát bò ño seõ ñöôïc gaén treân möùc saøn 1.5m taïi ñieåm khoâng bò aûnh höôûng cuûa beà maët khoâ hay noùng hay laïnh. Nhöõng phöông phaùp ño naøy seõ khoâng ñöôïc thöïc hieän khi thôøi tieát hay ñieàu kieän moâi tröôøng khaùc döôøng nhö coù theå gaây aûnh höôûng quaù möùc ñeán keát quaû.

Tieán haønh kieåm tra aâm thanh vaø ñoä rung ñeå ñaûm baûo thieát bò hoaït ñoäng ñaùp öùng möùc aâm thanh vaø ñoä rung cho pheùp vaø khoâng coù söï truyeàn ñoäng naøo qua caáu truùc xaây döïng. Möùc aâm thanh seõ ñöôïc ño vôùi hay khoâng vôùi maùy ñang hoaït ñoäng.

Caùc phöông phaùp ño seõ ñöôïc tieán haønh ôû ñoä cao1.5m treân möùc saøn nhaø vaø toái thieåu 1.5m töø baát kyø beà maët töôøng, cöûa soå hay traàn nhaø. Tieán haønh ño ñaïc trong quaõng töø 63Hz ñeán 8KHz.

Söû dung toång coäng 8 vò trí ño ôû töøng vaên phoøng. Bao goàm toái thieåu 2 soá ño ôû 1.5m töø moãi phoøng maùy.

Phoøng maùy - Keá phoøng ñieàu khieån chính

Beân ngoaøi toøa nhaø - Beân ngoaøi toøa nhaø

Ño möùc ñoä aùp suaát aâm thanh seõ ñöôïc thöïc hieän trong ñieàu kieän taûi troïng toái ña cuûa thieát bò hay moät phaàn taûi troïng ôû nhöõng nôi maø nhaø tö vaán höôùng daãn khi toøa nhaø troáng. Khoâng tieán haønh ño gaàn hôn 1500mm ñeán baát kyø ñaàu ra naøo vaø khoâng gaàn hôn 1000mm ñeán traàn, töôøng hay beà maët saøn nhaø.

Möùc ñoä oàn xung quanh trong khi kieåm tra cuõng ñöôïc ño giaù trò toái thieåu 6dB trong caùc quaõng.

Tieán haønh kieåm tra vaø phaân tích ñoä rung nhö trong phaàn “Ñieàu khieån tieáng oàn vaø ñoä rung” vaø saùch höôùng daãn ASHRAE (kieåm tra, ñieàu chænh vaø caân baèng).

(h) Kieåm tra hoaït ñoäng

Ngoaøi nhöõng yeâu caàu chuyeån giao neâu treân, caàn phaûi tieán haønh kieåm tra hoaït ñoäng vaø töø ñoù coù nhöõng chænh söûa cuoái cuøng caàn thieát, tieán haønh thöïc hieän trong thôøi gian baûo haønh hay thaäm chí khoâng laép ñaët ñaùp öùng theo yeâu caàu toái thieåu cuûa thoâng soá kyõ thuaät naøy, coù theå keùo daøi theâm thôøi gian.

Coù theå tieán haønh kieåm tra hoaït ñoäng trong naêm ngaøy lieân tuïc trong hai thaùng baát kyø naøo do nhaø tö vaán choïn. Trong quaù trình naøy, nhöõng thieát bò caàn thieát ñeå ghi nhöõng khoaûng nghæ haèng giôø trong thôøi gian laøm vieäc thoâng thöôøng seõ ñöôïc cung caáp:

● Nhieät ñoä baàu khoâ vaø baàu öôùt xung quanh .

● Nhieät ñoä baàu khoâ vaø baàu öôùt beân trong ôû vò trí khoâng nhoû hôn 1 vò trí treân 200m2 saøn .

● Öôùc tính soá ngöôøi trong töøng khu vöïc

● Öôùc tính toång soá ñeøn vaø thieát bò toûa nhieät söû duïng trong töøng khu vöïc




● Löu löôïng gioù töôi vaøo taïi moãi AHU. Löu löôïng gioù töôi phaûi ñöôïc duy trì gaàn vôùi giaù trò ñöôïc yeâu caàu trong suoát quaù trình tieán haønh kieåm tra

● Caùc heä soá khaùc aûnh höôûng ñeán taûi troïng nhieät trong heä thoáng vaø ngoaøi söï kieåm soaùt cuûa nhaø thaàu phuï

Vôùi nhöõng thoâng tin taûi troïng nhieät xung quanh vaø trong toøa nhaø neâu treân nhö laø moät cô sôû, toái thieåu ba soá ghi rieâng bieät seõ ñöôïc ghi vaø ñöôïc tính trung bình cho moãi nhieät ñoä, ñoä aåm, aùp suaát vaø löu löôïng cuûa nöôùc ñaàu vaøo vaø ra cuøng vôùi toác ñoä, doøng ñieän vaø quaù taûi ñöôïc caøi ñaët trong moãi ñoäng cô ñieän.

11.9 KIEÅM TRA CUÛA CÔ QUAN ÑÒA PHÖÔNG

Khi nhaän ñöôïc thoâng baùo hay chæ thò cuûa nhaø tö vaán, nhaø thaàu phuï phaûi tham döï caùc cuoäc kieåm tra do caùc cô quan coù thaåm quyeàn ñòa phöông tieán haønh goàm coâng ty caáp thoaùt nöôùc, baûo veä moâi tröôøng, phoøng chaùy chöõa chaùy vaø tieán haønh söûa chöõa nhöõng coâng vieäc khoâng tính phí theo yeâu caàu cuûa nhaø tö vaán nhö laø keát quaû cuûa caùc cuoäc kieåm tra maø ñöôïc xaùc ñònh laø khoâng ñaùp öùng vôùi quy ñònh ñòa phöông. Nhöõng cuoäc kieåm tra naøy coù theå ñöôïc tieán haønh sau khi phaùt haønh giaáy chöùng nhaän hoaøn thieän coâng trình.

Nhaø thaàu phuï coù traùch nhieäm ñeä trình caùc maãu vaø baûn veõ thi coâng caàn thieát ñeán vaên phoøng cô quan ñòa phöông vôùi kieán truùc môùi nhaát.

● Nhöõng hoà sô ñeä trình phaûi ñaùp öùng yeâu caàu cuûa cô quan ñòa phöông. Nhöõng hoà sô do nhaø thaàu phuï ñeä trình phaûi ñöôïc chuyeån ñeán nhaø tö vaán ñeå kieåm tra tröôùc khi noäp

● Nhaø thaàu phuï ñaûm baûo khoâng noäp treã nhöõng baûn kieåm tra do cô quan ñòa phöông tieán haønh, neáu khoâng seõ hoaøn toaøn chòu traùch nhieäm nhöõng haäu quaû do vieäc chaäm treã gaây ra

● Nhaø thaàu phuï ñöôïc pheùp noäp toái thieåu hai boä hoà sô cho töøng cô quan ñòa phöông, moät boä ñöôïc thöïc hieän trong voøng 6 thaùng sau khi truùng thaàu coâng trình vaø boä kia tröôùc khi cô quan ñòa phöông kieåm tra. Nhaø tö vaán coá theå töï ra chæ thò cho nhaø thaàu phuï noäp theâm hoà sô neáu caàn

Nhaø thaàu phuï seõ thoâng baùo nhaø tö vaán toái thieåu tröôùc baûy ngaøy veà ñôn yeâu caàu cô quan ñòa phöông kieåm tra. Khi nhaän ñöôïc vieäc xaùc ñònh ngaøy kieåm tra töø cô quan ñòa phöông, nhaø thaàu phuï seõ thoâng baùo ngay cho nhaø tö vaán.

11.10 HUAÁN LUYEÄN NHAÂN VIEÂN VAÄN HAØNH MAÙY

Sau khi baøn giao maùy, nhaø thaàu phuï seõ huaán luyeän cho nhaân vieân vaän haønh maùy cuûa khaùch haøng trong ba tuaàn caùch vaän haønh, an toaøn vaø vaän haønh , caùch baûo quaûn vaø baûo trì heä thoáng cuõng nhö dieãn giaûi caùch hoaït ñoäng cuûa baát kyø chöùc naêng ñaëc bieät naøo cuûa maùy cho nhaân vieân ñoøi hoûi caàn coù tay ngheà hay chöùng nhaän.

Chuyeân vieân kyõ thuaät coù kinh nghieäm vaø naêng löïc seõ ñeán giaûi thích vaø chæ daãn caùch thöïc hieän vaøo ngaøy do nhaø tö vaán thoâng baùo.




12. DÒCH VUÏ VAØ BAÛO TRÌ

12.1 PHAÏM VI

Thôøi gian baûo haønh vaø baûo trì ñöôïc xaùc ñònh trong phaàn 1.4. Nhaø thaàu phuï seõ thöïc hieän nhöõng cuoäc kieåm tra theo ñònh kyø khoâng quaù moät thaùng moät laàn, vaø baûo trì toaøn boä maùy moùc thieát bò ñöôïc qui ñònh trong hôïp ñoàng trong thôøi haïn baûo haønh vaø baûo trì.

Coâng vieäc yeâu caàu laø:

● Coù maët thöôøng xuyeân ôû coâng trình ñeå thöïc hieän baûo trì theo qui ñònh cuûa nhaø saûn xuaát thieát bò vaø theo qui ñònh trong soå tay vaän haønh vaø baûo trì

● Coù maët taïi coâng trình baát cöù luùc naøo trong thôøi haïn coù hieäu löïc neâu trong hôïp ñoàng baûo trì, theo yeâu caàu cuûa nhaø tö vaán hay chuû ñaàu tö vaø thöïc hieän vieäc söûa chöõa caàn thieát ñeå baûo ñaûm maùy moùc, thieát bò vaän haønh toát

● Söûa chöõa nhöõng khuyeát ñieåm khi hoaøn taát coâng trình vaø söûa chöõa caùc khuyeát ñieåm khaùc phaùt sinh trong giai ñoaïn baûo trì theo hôïp ñoàng

12.2 DÒCH VUÏ

Nhaø thaàu phuï chòu traùch nhieäm söûa chöõa toaøn boä caùc söï coá maùy moùc thieát bò. Do ñoù moät thôï cô khí coù naêng löïc coù maët taïi nhaø maùy caøng sôùm caøng toát sau khi nhaän ñöôïc thoâng baùo hö hoûng vaø thöïc hieän söûa chöõa ngay laäp töùc.

Neáu nhaø thaàu phuï khoâng coù maët trongnhaø maùy trong voøng 8 giôø laøm vieäc bình thöôøng sau khi nhaän ñöôïc thoâng baùo hö hoûng, vaø neáu vieäc söûa chöõa bò giaùn ñoaïn trong giôø laøm vieäc bình thöôøng khoâng phaûi vì khoâng coù caùc phuï tuøng thay theá töø nguoàn gaàn nhaát, nhaø tö vaán coù quyeàn yeâu caàu nhaø thaàu phuï hoaøn taát coâng vieäc söûa chöõa baèng chi phí cuûa nhaø thaàu phuï maø khoâng baõi boû traùch nhieäm cuûa nhaø thaàu phuï.

12.3 BAÙO CAÙO

Trong nhöõng laàn tôùi coâng trình, nhaø thaàu phuï seõ thöïc hieän baùo caùo döôùi daïng danh saùch kieåm tra, ghi nhaän chæ soá cuûa caùc thieát bò ño, ñieàu kieän cuûa caùc haïng muïc, baát cöù coâng vieäc söûa chöõa naøo ñöôïc tieán haønh, nhieät ñoä baàu khoâ vaø baàu öôùt cuûa khoâng khí beân ngoaøi.

Caùc baùo caùo seõ ñöôïc laøm thaønh ba baûn, do ñaïi dieän cuûa nhaø thaàu phuï kyù, vaø ñaïi dieän ñöôïc chæ ñònh cuûa chuû ñaàu tö/ ngöôøi uyû quyeàn tieáp kyù.

Caùc beân kyù baùo caùo giöõ laïi moät baûn sao vaø baûn thöù ba ñöôïc chuyeån ñeán nhaø tö vaán trong voøng boán möôi taùm giôø.

Khoaûn tieàn coøn laïi chæ ñöôïc thanh toaùn sau khi tö vaán xaùc nhaän nhaø thaàu ñaõ thöïc hieän ñuùng yeâu caàu baûo trì theo qui ñònh.

Tröôùc khi hoaøn thaønh coâng vieäc treân thöïc teá, nhaø thaàu phuï ñeä trình baùo caùo ñeå pheâ duyeät trong thôøi gian ñuû ñeå söûa ñoåi, ñieàu chænh baùo caùo (neáu caàn).




13. SOÅ TAY VAÄN HAØNH VAØ BAÛO TRÌ

13.1 TOÅNG QUAÙT

Khi hoaøn taát kieåm tra hieäu suaát vaø tröôùc khi hoaøn taát coâng trình, nhaø thaàu ñeä trình cho tö vaán moät baûn sao soå tay vaän haønh vaø baûo trì ñeå xem xeùt vaø pheâ chuaån.

Sau khi tö vaán xem xeùt vaø pheâ chuaån, nhaø thaàu cung caáp ñuû soá baûn sao neâu trong phaàn 1.4 cuûa soå tay vaän haønh vaø baûo trì.

Soå tay vaän haønh vaø baûo trì goàm moät phaàn mieâu taû ñaày ñuû coâng taùc laép ñaët vaø chöùc naêng cuûa caùc heä thoáng khaùc nhau coù lieân quan, cuøng vôùi nhöõng höôùng daãn caùc thao taùc caàn thieát ñeå vaän haønh vaø baûo trì coù hieäu quaû caùc heä thoáng ñöôïc laép ñaët.

Soå tay vaän haønh vaø baûo trì ñöôïc chuaån bò goïn gaøng vaø ñöôïc ñoùng baèng bìa cöùng vinyl, khaéc chöõ noåi ôû maët bìa vôùi daïng chöõ ñöôïc nhaø tö vaán chaáp thuaän.

Ngoaøi ra, töø “Soå tay vaän haønh vaø baûo trì” vaø teân cuûa coâng trình ñöôïc in noåi doïc theo gaùy cuûa moãi boä.

13.2 NOÄI DUNG SOÅ TAY VAÄN HAØNH VAØ BAÛO TRÌ

Noùi chung, noäi dung soå tay vaän haønh vaø baûo trì goàm nhöõng phaàn sau:

(a) Thoâng tin khaån caáp

Lieät keâ caùc soá ñieän thoaïi lieân laïc khaån caáp.

(b) Phuï luïc

Phuï luïc ñöôïc chia laøm töøng phaàn goàm danh saùch caùc baûn veõ, thieát bò vaø nhöõng haïng muïc töông töï ñeå deã daøng tham khaûo.

(c) Phaàn 1 – Moâ taû chung

Phaàn naøy ñöôïc chia laøm nhieàu phaànnhoû cho töøng heä thoáng, bao goàm moâ taû ñaày ñuû heä thoáng ñöôïc laép ñaët vaø phöông phaùp ñieàu khieån.

(d) Phaàn 2 – Höôùng daãn vaän haønh maùy

Phaàn naøy ñöôïc chia thaønh nhieàu heä thoáng khaùc nhau moâ taû ñaày ñuû vaø chính xaùc chuoãi caùc haønh ñoäng caàn thieát ñeå khôûi ñoäng, vaän haønh vaø taét maùy ñeå kieåm tra töï ñoäng vaø vaän haønh khaån caáp.

Caùc höôùng daãn goàm nhöõng höôùng daãn caàn thieát ñeå xaùc ñònh khi maùy coù söï coá vaø nhöõng hieän töôïng cuûa ñieàu kieän nguy hieåm.

(e) Phaàn 3 – Höôùng daãn laép ñaët, baûo trì vaø vaän haønh

Phaàn naøy ñöôïc chia thaønh nhieàu heä thoáng khaùc nhau, bao goàm höôùng daãn laép ñaët, baûo trì vaø vaän haønh cuûa nhaø saûn xuaát cho töøng thieát bò, lòch baûo trì trong thôøi haïn baûo haønh vaø baûo trì.

(f) Phaàn 4 – Thieát bò

Phaàn naøy ñöôïc chia thaønh nhieàu heä thoáng khaùc nhau, bao goàm danh saùch nhöõng haïng muïc thieát bò ñöôïc laép ñaët cuøng vôùi teân nhaø saûn xuaát, kieåu daùng, vaø/ hay chuûng loaïi, soá seâri, coâng suaát thieát keá (ví duï nhöõng thoâng tin lieân quan caàn thieát cho vieäc ñaët haøng hay thay theá).




Caùc thieát bò ñöôïc chia thaønh töøng phaàn nhaän dieän rieâng bieät.

(g) Phaàn 5 – Baùo caùo kieåm tra nghieäm thu

Phaàn naøy goàm caùc keát quaû thöû nghieäm vaø nghieäm thu.

(h) Phaàn 6 – Baûn veõ hoaøn coâng

Phaàn naøy goàm caùc baûn veõ hoaøn coâng theo qui ñònh.

13.3 BAÛN VEÕ HOAØN COÂNG

Theo caùc ñieàu khoaûn ñaõ neâu trong quy phaïm kyõ thuaät naøy, caùc baûn veõ hoaøn coâng phaûi theå hieän chính xaùc coâng taùc laép ñaët cho ñeán ngaøy hoaøn coâng treân thöïc teá. Tyû leä baûn veõ khoâng nhoû hôn 1:50.

Muïc ñích cuûa caùc baûn veõ laø moâ taû ñaày ñuû vaø hoaøn chænh toaøn boä heä thoáng ñaõ ñöôïc laép ñaët.

Nhìn chung, baûn veõ hoaøn coâng goàm:

● Boä baûn veõ sô ñoà heä thoáng oáng moâ taû chính xaùc kích thöôùc vaø vò trí oáng gioù, van gioù, oáng caáp, oáng hoài, gioù töôi, gioù thaûi vaø löu löôïng cuûa taát caû vò trí lieân quan.

● Phoøng maùy hoaøn chænh vaø/ hay baûn veõ boá trí thieát bò vôùi ñaày ñuû caùc thoâng soá nhaän bieát vaø töøng haïng muïc cuûa thieát bò

● Boä baûn veõ sô ñoà heä thoáng ñöôøng oáng, theå hieän chính xaùc kích thöôùc vaø vò trí thöïc teá cuûa heä thoáng hôi nöôùc, nöôùc laïnh, khí ga töï nhieân, v.v. söû duïng cho heä thoáng

● Sô ñoà daây ñieän vaø daây ñieàu khieån roõ raøng, moâ taû roõ raøng heä thoáng ñaùnh soá ñaàu cuoái, bao goàm baûn veõ (thöïc hieän teá vaø tyû leä) theå hieän thôøi gian chaäm treã vaø quaù taûi

● Sô ñoà ñieàu khieån heä thoáng ñöôïc laép ñaët. Caùc baûn veõ moâ taû thieát bò ñieàu khieån baèng ñoäng cô, töï ñoäng vaø vaän haønh baèng tay nhö van gioù, van, van xaû, caàu chì, van giaõn nôû, van solenoid, loã thoâng, oáng daãn löu, thieát bò loïc, thieát bò ño, nhieät keá, loïc Y, ñoàng hoà vaø caùc thieát bò coù lieân quan. Neáu caàn, baûn veõ cuõng bao goàm vieäc boá trí vaø nhöõng taàn soá khaùc nhau cuûa caùc thieát bò ñieàu khieån, caàu chì vaø caùc thieát bò ñieàu chænh khaùc. Caùc thieát bò phaûi ñöôïc nhaän bieát roõ raøng nhö loaïi vaø chöùc naêng

Baûn veõ phaûi coù kích thöôùc theo qi ñònh trong soå tay laép ñaët. Ñeä trình ñaày ñuû soá löôïng boä baûn veõ theo qui ñònh trong phaàn 1.4 cuûa qui phaïm kyõ thuaät naøy.

Neáu soá löôïng baûn veõ lieân quan quaù lôùn khoâng vöøa vôùi soå tay laép ñaët, cung caáp bìa phuø hôïp cho töøng boä baûn veõ theo ñuùng kích thöôùc baûn veõ. Caùc baûn veõ cuõng ñöôïc giaûm xuoáng khoå A3 ñeå ñöa vaøo soå tay laép ñaët.

Neáu ñöôïc qui ñònh trong phaàn 1.4 cuûa qui phaïm kyõ thuaät naøy, phaûi cung caáp ñóa CD chöùa caùc baûn veõ döôùi daïng taäp tin AutoCAD (phieân baûn môùi nhaát) vaø nhöõng phaàn neâu trong soå tay laép ñaët.

CAÙC MAÃU ÑÔN MÔØI THAÀU TENDER FORMS

Ngaøy/ Date: …………………………………………………………………………………………………………

Teân nhaø thaàu/ Contractor: …………………………………………………………………………………………………………

Ñaïi dieän bôûi/ Presentative: …………………………………………………………………………………………………………

Chöùc vu/ Positionï: …………………………………………………………………………………………………………

Kyù teân vaø ñoùng daáu/ Sign and chop: …………………………………………………………………………………………………………

BPS ♦ 37302 trang 1/2

MAÃU ÑÔN DÖÏ THAÀU M&E (TENDER FORM) BEST WESTERN NHA TRANG PLAZA HOTEL

38 TRAÀN PHUÙ - NHA TRANG - KHAÙNH HOØA

Chuùng toâi, kyù teân döôùi ñaây, baùo giaù döï thaàu cung caáp vaø laép ñaët toaøn boä HEÄ THOÁNG ÑIEÄN LAÏNH (MVAC) cho coâng trình Best Western Nha Trang Plaza Hotel theo ñuùng caùc baûn veõ thieát keá vaø quy phaïm kyõ thuaät vôùi giaù troïn goùi nhö sau: The quotation of supply & installation M&E systems signed off below for the Best Western Nha Trang Plaza Hotel project as shown by the tender drawings and specifications with the lump-sum prices below:

GIAÙ DÖÏ THAÀU (BIDDING PRICE)

I. PHAÀN VIEÄC CHAÙNH (MAIN WORKS): USD

Heä Thoáng ÑHKK vaø Quaït Huùt/Caáp Gioù (MVAC Services)

II. CHI PHÍ COÂNG TRÖÔØNG (PRELIMINARIES): USD

III. THUEÁ GTGT (VAT): USD

TOÅNG GIAÙ DÖÏ THAÀU HAÏNG MUÏC M&E (TOTAL M&E): USD

Toång giaù döï thaàu baèng chöõ (Total in writing):

…………………………………………………………………………………………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………………………………………………………………………………………

Chuùng toâi xaùc nhaän giaù chaøo thaàu bao goàm caùc muïc sau (we confirm the bidding prices included) : ………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………………………………………………………………………………………………… …………………………………………………………………………………………………………………………………………………………………………………………………………… ……………………………………………………………………………………………………………………………………………………………………………………………………………

Nhöõng gì chöa bao goàm trong hoà sô môøi thaàu nhöng nhaø thaàu xeùt thaáy caàn thieát phaûi bao goàm ñeå hoaøn thieän heä thoáng thì phaûi ñöôïc ghi roõ trong thô vaø phaûi ñính keøm vôùi maãu döï thaàu naøy (things that not included in the tender documents but the contractor feels it should be for the completed systems please attache with this form)

Nhaø thaàu phaûi ñieàn taát caû thoâng tin kyõ thuaät trong phaàn ñeå troáng cuûa phuï luïc B vaø ñieàn thoâng tin giaù thaàu trong baûng giaù döï thaàu cho töøng haïng muïc cuûa hoà sô môøi thaàu naøy (The contractor have to fill in the blank of appendix B for all technical data and the prices in schedule of prices for each item of this form)

GIAÙ CHAØO THAÀU SCHEDULE OF PRICES

Ngaøy/ Date: …………………………………………………………………………………………………………





BPS ♦ 37302 trang 2/2

BAÛNG GIAÙ DÖÏ THAÀU HAÏNG MUÏC MVAC (MVAC SERVICES - SCHEDULE OF PRICES)

BEST WESTERN NHA TRANG PLAZA HOTEL 38 TRAÀN PHUÙ - NHA TRANG - KHAÙNH HOØA

Baûng giaù döï thaàu sau ñaây seõ laø cô sôû ñeå duyeät xeùt thaàu. Nhaø thaàu seõ phaûi cung caáp baûn chaøo giaù chi tieát vaø caùc catalog cuûa thieát bò ñöôïc choïn ñeå döï thaàu khi coù yeâu caàu cuûa Chuû Ñaàu Tö / Tö Vaán.

Baûng baùo giaù theo haïng muïc chaùnh:

1. Maùy Chiller Giaõi Nhieät Nướcù (Water Cooled Chillers) USD 2. Maùy Bôm Nöôùc Heä Thoáng Chillers (Chilled Water Pumps) USD 3. Thaùp laøm maùt (Cooling Tower) USD

4. Maùy Bôm Nöôùc Heä Thoáng Thaùp laøm maùt (Condenser Water Pumps) USD 5. Giaøn trao ñoåi nhieät (Heat Exchangers) USD

6. Maùy Xöû Lyù Gioù Töôi (Primary Air Handling Units) USD 7. Maùy ÑHKK Lôùn Heä Chilled Water (Chilled Water - Air Handling Units) USD 8. Maùy ÑHKK Nhoû Heä Chilled Water (Chilled Water - Fan coil units) USD 9. Maùy ÑHKK Heä Gas (DX Split Air Conditioning System) USD 10. Quaït Caáp / Huùt Gioù (Mechanical Supply/Exhaust Fans) USD 11. Quaït Taïo Aùp Buoàng Thang (Stair Pressurization Fans) USD 12. Boä Caûm ÖÙng vaø Ñieàu Khieån HT ÑHKK (DDC & Sensors) USD 13. Van, Ñoàng Hoà Ño Aùp Löïc, Löu Löôïng (Valves, Gauges) USD 14. HT Bôm Hoaù Chaát (Chilled Water Chemical Dosing System) USD 15. HT Bình Giaûn Nôû (Expansion Tank & Fittings) USD 16. Loïc Gioù (Air Filters) USD 17. Mieäng Gioù Caáp/Hoài (Air Diffusers, Grilles, Louvres) USD 18. Oáng Gioù vaø Caùch Oàn/Nhieät (Ductwork & Insulation) USD 19. OÁng Nöôùc vaø Caùch Nhieät (Pipework & Insulation) USD 20. Caùp Nguoàn vaø Caùp Ñieàu Khieån (Power & Signal Cables) USD 21. Heä thoáng maùng ñôõ, oáng daãn caùp vaø caùc phuï kieän laép ñaët (Accessories) USD 22. Heä thoáng phaân chia löu löôïng gioù vaø ñieàu khieån (VAV & Control/VSD) USD 23. Baûn Veõ Thi Coâng vaø Maãu Vaät Tö trình duyeät (Shop Drwgs & Samples) USD 24. Vaän Haønh Thöû Nghieäm, Kieåm Tra vaø Nghieäm Thu (T&C) USD 25. Baûn Veõ Hoaøn Coâng, Soå Tay Vaän Haønh vaø Baûo Trì (O&M Manual) USD 26. 12 Thaùng Vaän Haønh vaø Baûo Trì, Baûo Döôûng (12 Months Maintenance) USD

TOÅNG GIAÙ DÖÏ THAÀU HAÏNG MUÏC MVAC: USD

ÑÔN GIAÙ

SCHEDULE OF RATES

Ngaøy/ Date: …………………………………………………………………………………………………………





BPS ♦ 37302 trang 1/3

BAÛNG ÑÔN GIAÙ HAÏNG MUÏC MVAC (MVAC SERVICES - SCHEDULE OF RATES)


Baûng ñôn giaù döï thaàu sau ñaây seõ laø cô sôû ñeå duyeät xeùt thaàu vaø duyeät xeùt caùc khoaûn thanh toaùn vaø tính phaùt sinh neáu coù.

The below rates shall be the basic for tender approval and variation approval

Baûng ñôn giaù phaûi laø giaù coá ñònh (fixed prices) vaø bao goàm taát caû caùc phuï kieän ñi keøm ñeå hoaøn taát vieäc laép ñaët nhö ñöôïc theå hieän trong baûn veõ hoaëc Quy phaïm kyõ thuaät. The rates shall be fixed prices and included all accessories to complete the installtion as specify in the specification

Currency shall be in USD

1. REGISTER / DIFFUSERS / GRILLES PRIOR TO CEILING INSTALLATION

AFTER CEILING INSTALLATION

Relocation of one ceiling mounted diffuser with up to 3m additional flexible, after first fix $ $

Supply and installation of one additional diffuser including 5m flexible and including duct connection, after first fix

Up to 100L/s 100L/s to 200L/s 200L/s to 300L/s

$

$

$

$

$

$

Deletion of diffuser including 5m flexible and including duct connection, after first fix

Up to 100L/s 100L/s to 200L/s 200L/s to 300L/s

$

$

$

$

$

$

2. Relocation of one FCU up to 3m after first fix $ $

3. DUCTWORK BARE GALVANISED METAL DUCT

WITH 25MM INTERNALLY INSULATED

Ductwork and insulation per metre length for the following semi-perimeter sizes:

Up to 400 mm 600 mm 800 mm 1000 mm 1200 mm 1400 mm

$

$

$

$

$

$

$

$

$

$

$

$

$

$

$

$

$

$

Ngaøy/ Date: …………………………………………………………………………………………………………





BPS ♦ 37302 trang 2/3


MVAC SERVICES - SCHEDULE OF RATES (Continue)

4. PIPEWORK INSULATED BLACK STEEL PIPE – INDOOR INSTALLATION

INSULATED BLACK STEEL PIPE – OUTDOOR INSTALLATION

Chilled Water Pipework including insulation per metre length for the following nominal diameters:

∅32 mm ∅50 mm ∅65 mm ∅80 mm ∅100 mm ∅125 mm ∅150 mm ∅200 mm ∅250 mm ∅300 mm Above ∅300 mm

$ $ $ $ $ $ $ $ $ $ $

$ $ $ $ $ $ $ $ $ $ $

5. PIPEWORK GALVANIZED STEEL PIPE – INDOOR INSTALLATION

GALVANIZED STEEL PIPE – OUTDOOR INSTALLATION

Condenser Water Pipework per metre length for the following nominal diameters:

∅100 mm ∅125 mm ∅150 mm ∅200 mm ∅250 mm ∅300 mm Above ∅300 mm

$ $ $ $ $ $ $

$ $ $ $ $ $ $

6. ASSOCIATED ELECTRICAL WORKS UNIT RATE

Supply, installation and connection of MCB to MSSB

1 x 16A SP 6kA $

1 x 20A SP 6kA $

1 x 20A TP 6kA $

Supply and installation on cable tray, unistrut or in underground conduits or the following cables. (excluding tray, strut or conduit costs - per meter)

Ngaøy/ Date: …………………………………………………………………………………………………………





BPS ♦ 37302 trang 3/3


MVAC SERVICES - SCHEDULE OF RATES (Continue)

1 x 4C+E 4mm2 PVC/PVC $









6. LABOUR RATES UNIT RATE

Labour rates for items not covered by unit rates:

Ordinary Time $

Public Holidays Time $

DANH SAÙCH NHAÂN SÖÏ SCHEDULE OF PERSONNEL

Ngaøy/ Date: …………………………………………………………………………………………………………





BPS ♦ 37302 trang 1/1

BAÛNG LIEÄT KEÂ NHAÂN SÖÏ (SCHEDULE OF PERSONNEL)


Baûng lieät keâ nhaân söï sau ñaây seõ laø cô sôû ñeå duyeät xeùt thaàu. Nhaân söï ñöôïc lieät keâ trong baûn naày phaûi ñöôïc boá trí ñeå laøm vieäc taïi coâng tröôøng

The below schedule of personnel shall be the basic for tender approval. The listed persons shall be worked on site Item Full Name Experience Qualification

1 DIRECTOR RESPONSIBLE FOR THE PROJECT

2. PROJECT MANAGER

3. SITE MANAGER IN CONTINUOUS ATTENDANCE ON SITE

4. PROJECT ENGINEERS IN CONTINUOUS ATTENDANCE ON SITE

5. QUALITY ASSURANCE REPRESENTATIVE

6. LIST OF SUB-CONTRACTORS/SPECIALIST (if any)

Controls: Sewer Treatment Plant: Commissioning – Chillers: Commissioning – BMS System: Commissioning – Telephone / Data System: Commissioning – Power Supply System: Commissioning – Fire Protection System:

37302. Nha Trang Mvac Spec

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