22 05 00 - COMMON WORK RESULTS FOR PLUMBING.pdf

MINISTRY OF HOUSING Western Sector Projects Sitework & Infrastructure OMRANIA and ASSOCIATES Project Specification

COMMON WORK RESULTS FOR PLUMBING SECTION 22 05 00 - 1

SECTION 22 05 00

COMMON WORK RESULTS FOR PLUMBING PART 1: GENERAL

1.01 SECTION INCLUDES

A Underground pipe materials, valves and fittings common to plumbing piping systems including, but not limited to the following :

1. Irrigation Water.

2. Potable Water.

3. Pressurised (Pumped) Sewerage.

4. Gravity Sewerage.

5. Storm Water.

1.02 RELATED SECTIONS

A. Section 31 23 16 Excavation.

B. Section 31 23 16.13 Trenching.

C. Section 33 49 00 Storm Drainage Structures.

D. Section 33 30 00 Sanitary Sewerage Utilities.

E. Section 33 32 16 Packaged Utility Waste Water Pumping Stations.

F. Section 22 05 13 Common Motor Requirements for Plumbing Equipment.

G. Section 46 07 13 Packaged Water Treatment Equipment.

H. Section 46 07 53 Packaged Wastewater Treatment Equipment.

I. Section 32 80 00 Irrigation.

J. Section 03 20 00 Concrete Reinforcing.

K. Section 03 30 00 Cast in Place Concrete.

1.03 REFERENCES

A. ASME B 16.5 Pipe Flanges and Flanged Fittings.

B. ASME B 16.42 Ductile Iron Pipe Flanges and Flanged Fittings: Classes 150 and 300.



C. ASTM A 74 Standard Specification for Cast Iron Soil Pipe and Fittings.

D. ASTM C 12 Standard Practice for Installing Vitrified Clay Pipe Lines.

E. ASTM C 14M Standard Specification for Concrete Sewer, Storm Drain, and Culvert Pipe [Metric].

F. ASTM C 76M Standard Specification for Reinforced Concrete Culvert, Storm Drain, and Sewer Pipe [Metric].

G. ASTM C 425 Standard Specification for Compression Joints for Vitrified Clay Pipe and Fittings.

H. ASTM C 443M Standard Specification for Joints for Circular Concrete Sewer and Culvert Pipe, Using Rubber Gaskets [Metric].

I. ASTM C 564 Standard Specification for Rubber Gaskets for Cast Iron Soil Pipe and Fittings.

J. ASTM C 700 Standard Specification for Vitrified Clay Pipe, Extra Strength, Standard Strength, and Perforated.

K. ASTM C 924M Standard Practice for Testing Concrete Pipe Sewer Lines by Low- Pressure Air Test Method (Metric).

L. ASTM C 969M Standard Practice for Infiltration and Exfiltration Acceptance Testing of Installed Precast Concrete Pipe Sewer Lines [Metric].

M. ASTM C 1103M Standard Practice for Joint Acceptance Testing of Installed Precast Concrete Pipe Sewer Lines [Metric].

N. ASTM D 698 Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort (12,400 ft-lbf/ft3 (600 kN-m/m3)).

O. ASTM D 1557 Test Method for Laboratory Compaction Characteristics of Soil Using Modified Effort (56,000 ft-lbf/ft3(2,700 kN-m/m3)).

P. ASTM D 2321 Standard Practice for Underground Installation of Thermoplastic Pipe for Sewers and Other Gravity-Flow Applications.

Q. ASTM D 2729 Standard Specification for Poly(Vinyl Chloride) (PVC) Sewer Pipe and Fittings.

R. ASTM D 3034 Standard Specification for Type PSM Poly(Vinyl Chloride) (PVC) Sewer Pipe and Fittings.

S. ASTM D 2922 Standard Test Methods for Density of Soil and Soil-Aggregate in Place by Nuclear Methods (Shallow Depth).



T. ASTM D 2992 Standard Practice for Obtaining Hydrostatic or Pressure Design Basis for "Fiberglass" (Glass-Fiber-Reinforced Thermosetting-Resin) Pipe and Fittings.

U. ASTM D 3017 Standard Test Method for Water Content of Soil and Rock in Place by Nuclear Methods (Shallow Depth).

V. ASTM D 3261 Standard Specification for Butt Heat Fusion Polyethylene (PE) Plastic Fittings for Polyethylene (PE) Plastic Pipe and Tubing.

W. ASTM D 3350 Standard Specification for Polyethylene Plastics Pipe and Fittings Materials.

X. ASTM D 3567 Standard Practice for Determining Dimensions of "Fiberglass" (Glass- Fiber-Reinforced Thermosetting Resin) Pipe and Fittings.

Y. ASTM D 3754 Standard Specification for "Fiberglass" (Glass-Fiber-Reinforced Thermosetting-Resin) Sewer and Industrial Pressure Pipe.

Z. ASTM D 4024 Standard Specification for Machine Made "Fiberglass" (Glass-Fiber- Reinforced Thermosetting Resin) Flanges.

AA. ASTM D 4161 Standard Specification for "Fiberglass" (Glass-Fiber-Reinforced Thermosetting-Resin) Pipe Joints Using Flexible Elastomeric Seals.

BB. ASTM F 714 Standard Specification for Polyethylene (PE) Plastic Pipe (SDR-PR) Based on Outside Diameter.

CC. ASTM F 1248 Standard Test Method for Determination of Environmental Stress Crack Resistance (ESCR) of Polyethylene Pipe.

DD. AWS Welding and Brazing Qualifications.

EE. AWWA C 110 Ductile Iron and Gray Iron Fittings 3” through 48”, for Water and other Liquids.

FF. AWWA C 115-11 flanged ductile Iron or Gray Iron Threaded Flanges.

GG. AWWA C 150/A21.50 Thickness Design of Ductile Iron Pipe.

HH. AWWA C 151 Ductile Iron Pipe, Centrifugally Cast for Water and other Liquids.

II. AWWA C 500-80 Standard for Gate Valves 3” through 48” NPS for Water and Sewage Systems.

JJ. AWWA C 502 Dry Barrel Fire Hydrants.

KK. AWWA C 506 Backflow Prevention Devices – Reduced Pressure Principles and Double Check Valve Types.



LL. AWWA C 906 Standard for Polyethylene (PE) Pressure Pipe and fittings, 4 In. (100 mm) Through 63 In. (1,575 mm), for Water Distribution and Transmission.

MM. AWWA C 950 Fibreglass Pressure Pipe.

NN. ISO 2531 Ductile Iron Pipes, Fittings and Accessories for their Joints for Water Application.

OO. ISO 4179 Ductile Iron Pipes and Fittings for Pressure and Non-pressure pipelines – Cement Mortar Lining

PP. ISO 4427 Plastic piping Systems. Polyethylene (PE) Pipes and Fittings for Water Supply.

QQ. ISO 4633 Rubber Seals – Joint Rings for Water Supply, Drainage and Sewerage Pipelines – Specification for Materials.

RR. ISO 8179-1 Ductile Iron Pipes – External Zinc Coating – Metallic Zinc with Finishing Layer.

SS. ISO 9261:2004 Agricultural Irrigation Equipment – Emitters and emitting pipes – Specification and test methods.

TT. MSS SP Butterfly Valves.

UU. MSS SP-71 Cast Iron Swing Check Valves, Flanged and Threaded Ends.

VV. MSS SP-78 Cast Iron Plug Valves, Flanged and Threaded Ends.

WW. MSS SP-80 Bronze Gate, Globe, angle and Check Valves.

XX. MSS SP 110 Ball Valves Threaded, Socket-Welding, Solder Joint, Grooved and Flared Ends.

YY. SAS 14 Pipes for Potable Water of Unplasticized Plastic (Polyvinyl Chloride).

ZZ. SAS 15 Methods of Testing of Pipes for Potable Water of Unplasticized Plastic (Polyvinyl Chloride).

AAA. UPC Uniform Plumbing Code

1.04 SUBMITTALS

A. Comply with the requirements of Section 01 33 00.

1.05 QUALITY ASSURANCE

A. Manufacturers: Firms engaged in the manufacture of pipework, valves, ancillary equipment and fittings whose products have been in satisfactory use in similar service for not less than 10 years.



B. Installer: Firms engaged in the installation of pipework and valves of a similar quality and scope to that required for the project, for a period of not less than 5 years.

1.06 OPERATION AND MAINTENANCE DATA

A. Comply with the requirements of Sections 01 78 23 and 23 05 00.

1.07 HANDLING

A. All products shall be handled and stored as recommended by the manufacturer to prevent damage and deterioration.

B. Supply handling equipment such as lifting beams, reinforced canvas slings, protective padding, struts, cradles, etc. required to install products without damage.

C. Unload all products singly from trucks or lorries. Unless cranes are used, pipes shall be unloaded by means of skids and check ropes and no pipe shall be dropped.

D. Each pipe unit shall be site stored, stacked and handled into its position in the trench only in such manner, and by such means, that affords total protection from damage of any kind. Site stacking of pipework shall be such that the pipework shall not deform or be damaged in any way through storage or retrieval. The manufacturer's recommendations shall be taken as the minimum requirement. All site storage areas for Ductile Iron (DI), PE and uPVC pipes shall be shaded.

E. Observe and implement as part of field procedures, the following requirements for DI, PE and uPVC piping:

1. All pipes shall be stacked on a reasonably flat surface free from sharp projections, stones or other protuberances likely to deform them. If necessary, level the ground at the storage point by means of a vehicle fitted with a scraper blade in order that pipes may be uniformly supported throughout their length.

2. Side supports in the form of wooden posts, not less than 75 mm square shall be provided at not more than 1500 mm intervals along the pipe length. Stack widths shall not exceed 2000 mm.

3. When socketed pipes are stacked, the sockets shall be placed at alternate ends of the stack with the sockets protruding so pipes are evenly supported along their entire length.

4. Pipes of different sizes or wall thickness shall be stacked separately, or where this is not possible, those with larger diameter and thicker walls shall be at the bottom.

5. No piping shall be exposed to direct sunlight for more than two weeks during installation. The pipes shall be stored under a protective tarpaulin cover, which shall not leave any pipe surface or pipe ends exposed. The cover shall be arranged to allow air circulation within its volume of confinement by fixing tarpaulin to wooden supports.

6. Fittings shall be stored under shade conditions preferably in boxes or sacks that allow a free passage of air.



7. Transport DI, PE and uPVC pipes to the job site in special pile rack type containerised units to facilitate loading, unloading, on-site storage, retrieval and protection of piping from sunlight and ultraviolet (UV) radiation.

F. Give full consideration to safety aspects when locating, planning and constructing stacking areas and while stacking pipes.

G. When repairing already installed DI, PE and uPVC-piping systems, keep covered against solar radiation exposure.

PART 2: PRODUCTS 2.01 ACCEPTABLE MANUFACTURERS

Not Used.

2.02 GENERAL

A. All goods and products shall be new and free from any surface rust or mill scale.

B. All individual lengths of pipework or individual valves shall be stamped with their manufacturer’s name, place of origin, size and class or duty.

C. All pipework and valves shall be of the pressure rating, material & diameter as shown on the Drawings and specified herein.

2.03 PIPEWORK AND FITTINGS

A. Irrigation Pipework:

1. All primary irrigation pipework and fittings shall be High Density Polyehtylene (HDPE) PE-100 PN16 in accordance with ISO 4427.

2. All pipework-fitting joints shall be joined together with butt fusion joining system as per manufacturer’s recommendations.

3. Tees and elbows mechanical fittings shall be as produced by company specializing in the manufacture of PE fittings for pressure rating of not less than 16 bar. All mechanical joints shall be capable to withstand end thrust induced by internal hydraulic pressure.

4. All flexible irrigation pipework and fittings shall be Low Density PE (LDPE) tubing in accordance with ISO 9261:2004. Mechanical joints shall be by approved compression fittings.

B. Water Mains:

1. All water mains pipework and fittings up to and including 90 mm diameter shall be High Density PE (HDPE) PE-100 PN16 in accordance with ISO 4427.



2. All pipework-fitting joints shall be joined together with butt fusion joining system as per manufacturer’s recommendations.

3. Tees and elbows mechanical fittings shall be as produced by company specializing in the manufacture of PE fittings for pressure rating of not less than 16 bar. All mechanical joints shall be capable to withstand end thrust induced by internal hydraulic pressure.

4. Polyethylene (PE) flanged pipes wherever specified shall be in accordance with AWWA C 906 or ASTM D 3261.

C. Water Mains:

1. All water mains pipework 100 mm diameter and larger shall be cement coated ductile iron Class K9 to ISO 2531. Pipe fittings shall be Class K12 except for tees which shall be Class K14.

2. Ductile iron pipes shall have socket and spigot with EPDM rubber gasket joints. EPDM rubber shall be in accordance with ISO 4633.

3. Ductile iron flanged pipes wherever specified shall have screwed-on or cast-on flanges to sustain working pressure of PN16 minimum. Flanged joints shall be dimensioned and drilled in accordance with ISO 2531.

5. Internal cement coating of ductile iron pipes shall be applied by centrifugal process in compliance with ISO 4179. External coating of pipes shall be by pure metallic zinc in accordance to the minimum requirements of ISO 8179-1. Bituminous paint in accordance with ISO 8179-1 shall then be applied over the zinc external coat.

D. Pumped Sewerage Mains:

1. All sewage pumping mains pipework and fittings shall be cement coated ductile iron Class K9 to ISO 2531. Pipe fittings shall be Class K12 except for tees which shall be Class K14.




E. Gravity Sewerage Pipework:

1. All gravity house connection sewerage pipework and fittings up to and including 160 mm diameter shall be uPVC Class 4 in accordance with SASO SAS 14 or as indicated on the Drawings, with ring seal joints.



F. Gravity Sewerage Pipework:

1. All gravity sewerage pipework and fittings 150 mm and larger shall be vitrified clay pipe and fittings to SASO 235/236 and ASTM C 700 in sulphate resisting cement. Strength class shall be Class 160 unless otherwise stated on drawings.

2. Sealing elements shall be made of elastomer with resin inside the socket for 150 mm diameter pipes and polyurethane casted at spigot end and inside the socket for pipes 200 mm diameter and larger.

G. Fire Mains:

1. All fire water mains pipework 100 mm diameter and larger shall be cement coated ductile iron Class K9 to ISO 2531. Pipe fittings shall be Class K12 except for tees which shall be Class K14.




2.04 VALVES

A. General:

1. All valves shall be of a pressure class not less than the test pressure for the system in which they are installed.

2. All valves shall open by counter-clockwise rotation of the valve stem.

3. Buried sections of valves shall have the same external protection as the underground pipework with which they are to be used.

4. All buried valves shall be in cast iron or cast in-situ concrete valve chambers as indicated on the Drawings. Each valve chamber shall have a cast iron access cover which shall be inscribed in Arabic and English with the service in which the valve is installed e.g. “POTABLE WATER” etc.

5. Bodies of valves up to and including 50 mm size shall be of cast gunmetal or bronze. Bodies of valves 65 mm size and larger shall be of cast iron. Castings shall be of good quality, clean and smooth and free from scale or flaws.

6. Holes in covers or in gates for screwed portions of spindles shall have full threads of a length not less that the diameter of the spindle over the thread. Glands shall be machined to



provide a running fit between the spindle and the stuffing box. Stuffing boxes shall be properly packed or fitted with "O" rings that may be located in plastic bushes.

7. Valves up to and including 50 mm size shall have taper screwed ends, and of 65 mm size and above shall have flanged ends.

8. All screwed valves shall have heavy hexagonal reinforcements at openings, threads of ample length to ensure a sound joint and heavy shoulders to prevent over entry of pipes, fittings or adapters.

9. Flanged valves shall have flat-faced flanges conforming to ASME B 16.42.

10. All valves and valve components (e.g. seatings, packings etc.) shall be suitable for the working pressures, operating temperatures and conditions of the fluid handled in the systems in which they will be installed. All valves shall be hydraulically tested to at least twice the working pressure of the systems in which they will be installed. Where necessary, valves shall have extended spindles to facilitate insulation. The declared pressure rating of the valve shall be a minimum of the test pressure to be applied to a particular system.

11. Each valve shall have the manufacturer’s name or trade mark, the code designation number, the nominal diameter, the nominal pressure rating and the body material identification all identified in the form of stamped or cast body markings.

12. Irrigation valves shall be in accordance with Section 32 80 00.

B. Gate Valves (Isolating)

1. Isolating valves up to and including 50 mm nominal bore shall be bronze or gunmetal gate valves with solid wedge discs, non-rising stems, screwed in bonnets, metal hand wheels and screwed ends.

2. Isolating valves of 65 mm nominal bore and above shall be cast iron gate valves with solid wedge discs with bronze trim and seatings, bolted on cast iron bonnets, high grade graphite asbestos packings, rising stems with outside screws and yokes, cast iron handwheels and flanged ends.

C. Non Return (Check) Valves:

1. Non-return valves up to and including 50 mm nominal bore shall be of the bronze swing pattern with screwed ends.

2. Non-return valves 65 mm nominal bore and above shall be of the cast iron swing pattern with bolted access covers, solid discs with bronze trim and seatings and flanged ends to ASTM B 16.42. An air cock shall be fitted to the bolted cover for air release purposes.

D. Air release valves: Single and double air release valves shall be fitted on pressure mains as necessary. Valves shall be automatic type with manual drain plug, cast iron bodies with epoxy coating, PVC float and EPDM seat.



E. Fire Hydrants: Fire Hydrants shall be of the post type dry barrel design in accordance with ANSI/AWWA C 502, with 2 pump connections. Thread on pump connections shall be coordinated with Civil Defence or other relevant authority standard.

2.05 COATING AND SLEEVING MATERIAL

A. Field applied coating and sleeving materials for all buried underground piping appurtenances and accessories including flanges, fittings, detachable, flexible couplings and flange coupling adapters shall be the same as that specified for the pipe to which they are attached, or as specified for couplings and flange adapters.

2.06 PIPE LABELING

A. All pipes shall be labelled according to their respective size, standard and class.

1. All labelling shall be indelible and provided by the pipe manufacturer as part of the manufacturing process.

2. All labelling shall be adjacent to pipe hubs to facilitate field checking.

PART 3: EXECUTION 3.01 INSPECTION

A. Comply with Section 01 31 00.

B. Inspect all products for damage immediately before installation. Any products that are damaged or not in accordance with this Specification shall be repaired or removed from the site and replaced.

C. All pipes, valves, fittings and piping accessories shall be inspected at time of delivery for damage and for compliance with this Specification.

3.02 VALVE BOXES AND CHAMBERS

A. Structure Excavation and Backfilling: Structural excavation and backfilling shall in accordance with Section 31 23 13.

B. Concrete Reinforcement: Concrete reinforcement shall be in accordance with Section 03 20 00.

C. Cast-In-Place Concrete: Cast-in-place concrete shall be in accordance with Section 03 30 00.

3.03 TRENCHING, BEDDING, BACKFILLING AND COMPACTING

A. Trenching, bedding, backfilling, and compacting shall be in accordance with Section 31 23 16.13.

3.04 CONCRETE BEDS, HAUNCHING AND SURROUNDS TO PIPES

A. Concrete beds, haunchings, and surrounds to pipes shall be as shown on the Drawings.



3.05 CONCRETE THRUST BLOCKS

A. Concrete thrust blocks shall be constructed on pressure pipelines at all changes in direction or size. The thrust blocks shall be of unreinforced concrete class C15S in accordance with Section 03 30 00, and shall be of dimensions shown on the Drawings. Pipelines shall be located centrally in the thrust blocks.

3.06 PROTECTION OF PIPEWORK

A. Mating surfaces, such as flange faces, shall be protected to prevent rusting before installation.

B. Installation of coated items shall not take place until sufficient set has occurred in the coating to allow handling of the coating without damage. Minor coating damage occurring during installation may be repaired in place or, at the discretion of the Engineer, pipes shall be removed from the trench and recoated. Any improperly applied coating or wrapping shall be removed, the item cleaned and recoated as required by the Engineer.

C. No backfill or concrete pour around any coated items shall take place until sufficient curing of the coating or coating repairs has occurred. At the time of installation of the pipework, any damage to manufacturer's protective finishes shall be repaired in accordance with the manufacturer's recommendations and to the satisfaction of the Engineer, at no extra cost.

3.07 PIPEWORK INSTALLATION

A. General:

1. All the pipe installation works shall be carried out in accordance with manufacturer's recommendations.

2. Coating cutbacks shall be prepared and the joint area cleaned and primed before the joint wrap is applied.

3. All pipes, fittings, valves and other materials shall be carefully lowered into the trench.

4. Every precaution shall be taken to prevent foreign material from entering the pipe while it is being placed. If the pipe cannot be placed into the trench without soil entering the pipe, a heavy, tightly woven canvas bag of suitable size shall be placed over each end and left there until the connection is to be made to the adjacent pipe or fittings. During laying operations, no debris, tools, cloth, or other materials shall be placed in the pipe.

5. Socket and spigot pipes shall be laid with the socket pointing against flow direction.

6. The full length of each section of pipes and fittings shall rest solidly on the pipe bed with recesses excavated to accommodate bells, joints, and couplings, anchors and supports shall be provided where necessary and where indicated on the Drawings. Proper provision shall be made for expansion and contraction of pipelines.

7. Open ends of pipes at the end of day's work shall be closed temporarily with wood blocks or bulkheads. Pipes shall not be laid when the conditions of trench or weather are unsuitable.



8. Wherever jointing is specified with solvent cement mortar, six or more lengths of pipe shall be in place ahead of each joint before such joint is finished.

9. The cutting of pipes for inserting valves, fittings or closure pieces shall be done in a neat and workmanlike manner without damage to the pipes or lining and so as to leave a smooth end at right angles to the longitudinal axis of the pipes. When machine cutting is not available for cutting metal pipe 500 mm in diameter or larger, the electric-arc cutting method is permitted. Only qualified and experienced workmen shall be employed on this work. Flame cutting of pipes by means of an oxyacetylene torch shall not be allowed.

10. All pipework shall be installed in accordance with the manufacturer’s instructions and this Specification.

3.08 LAYING LINES OF PIPES

A. Provide and fix properly painted sight rails which will be checked by the Engineer before any pipes are laid. There shall be no fewer than three sight rails in position at one time on every length of pipe under construction. Boning rods shall be provided, and wooden pegs shall be driven into the bottoms of the trenches at intervals not exceeding 3 meters, the top of each peg being set at the exact level of the proposed invert of the pipe.

B. Bottoms of trenches shall be trimmed ready to receive the pipes, and recesses cut for the sockets. The pipes shall then be laid with the aid of a straight edge, which shall rest truly in the invert of the pipe previously laid, the pipe being laid on the nearest peg. The pegs shall be removed as the work proceeds. Should any unsound material occur in the bottoms of the trenches, such unsound materials shall be removed on the instructions of the Engineer and replaced with lean mix concrete as specified.

3.09 CROSSOVERS

A. Where two pipelines cross with less than 300 mm vertical separation, pipes shall be surrounded with concrete for not less than 1000 mm centred on the crossing point.

3.10 TESTING

A. Inform the Engineer sufficiently in advance to give him a reasonable opportunity to attend all tests and inspections.

B. Check all sections of the installation to ensure they are free from obstruction debris before testing.

C. Obstruction Test: All pipelines having a nominal diameter of less than 300 mm shall be tested for obstructions by drawing through each completed length a mandrel 750 mm long and having a diameter 10 mm less than the actual pipe diameter.

D. Pipelines having a nominal diameter of 300 mm and over shall be visually inspected with a mirror and light at opposite ends of a run.

E. Provide clean water, assistance and apparatus for testing and inspection as required.



F. All lengths of drains shall be tested after laying and jointing but before covering and tested again after completion of backfilling.

G. A record of all tests shall be kept, a copy of which shall be given to the Engineer.

H. All lengths of drains, manholes and inspection chambers shall be capable of passing the tests specified. All defects shall be located and remedied without delay and retested as instructed.

3.11 TESTING GRAVITY DRAINS

A. The air test shall be accepted as an alternative to the water test. If pipework fails the air test, carry out the water test, which shall determine acceptability.

B. Air Testing of Pipework:

1. Fit expanding plugs or inflatable canvas or rubber test bags into the ends of the pipeline and all associated branches.

2. Connect a glass ‘U’ tube gauge (manometer) to one of the sealing plugs and a means of applying air pressure to another sealing plug or stopper inserted in the section of pipework under test. Manometer and air pressure source shall be located at opposite ends of the pipework under test.

3. Pump air into test section until pressure, slightly higher than 100 mm water gauge for pipelines or where gullies and/or ground floor appliances are connected, of slightly more than 50 mm water gauge.

4. Allow 5 minutes for stabilisation of air temperature.

5. Adjust air pressure to 100 mm or 50 mm water gauge as necessary.

6. Without adding further air, pressure must not fall by more than 25 mm water gauge in a period of 5minutes for a 100 mm water gauge test and 12 mm for a 50 mm water gauge test.

C. Water testing of pipelines:

1. Temporarily seal low ends of drains and connections.

2. Fill system with water to produce 1.5 m head in a standpipe at high end and not more than 4.0 m head at low end.

3. Allow pipeline to stand for 2 hours for absorption, topping up as necessary.

4. Measure loss at water by noting the quantity of water needed to maintain the test head for 30 minutes.

5. Loss of water for drains shall be not more than 1 litre per hour per metre diameter per linear metre run. This may be expressed as follows:

a. 100 mm dia. pipe 0.05 litres per meter run.



b. 150 mm dia. pipe 0.08 litres per meter run.

c. 200 mm dia. pipe 0.12 litres per meter run.

d. 300 mm dia. pipe 0.15 litres per meter run.

3.12 TESTING PRESSURE MAINS

A. Pumping mains of ductile iron or other materials shall be tested by hydraulic pressure to a pressure twice the specified working head. The test shall be made with proper hydraulic testing apparatus, which shall be located at the lowest part of the section of the pipework under test. Precautions shall be taken to prevent movement of the main by anchoring all bends and junctions with concrete brought up to at least the centre of the pipe and carried to the face of excavation, and by covering the centre of each pipe with earth, leaving the joints bare. All blanked ends shall be given adequate support. After pressure has been applied, it shall be maintained without pumping for a period of one hour. Should any fall of pressure occur, the fault shall be rectified and a further test made until the pipe is found to be completely watertight.

3.13 FINAL CLEANING OF PIPELINES

A. Before handing over any pipeline pass through it a rubber disc plunger or swab and in the case of jointed pipelines, simultaneously flush the line with clean water. Both ends shall then be closed by temporary plugs or bulkheads to prevent entry of dirt or foreign matter.

END OF SECTION

22 05 00 - COMMON WORK RESULTS FOR PLUMBING.pdf

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