NOTICE TO TENDERERS

Tender number: DBN/CAP (RTPC) 652/1

Tenders invited for: INSTALLATION OF PA SYSTEMS AT JACOBS, CHATSGLEN, BAYVIEW, ESCOMBE, HAVENSIDE & FYNNLANDS STATIONS FOR PRASA

With effect from 03 October 2016 and 10 October 2016 the tender document (CD) may be collected at:

Address: Metrorail Regional Office65 Masabalala Yengwa AvenueDurban Station

Office hours: Mondays to Fridays 08:00 to 15:30 (ONLY)

CIDB GRADING OF 4 EB IS APPLICABLE TO THIS TENDER

where CD’s can also be obtained on payment of an amount of R 1 000.00 per disc which is not refundable. No cash or cheques will be accepted at PRASA offices – (Bank Deposit or Electronic Payments - allow for 1-day delay). Clearly indicate the Tender Number on the Deposit Slip or EFT document as reference.

BANKING DETAILS:-

Metrorail KZN, Standard Bank, Windermere, Branch Code: 042726, Account No.: 050832948

Confirmation of EFT payment must be e-mailed to the Senior Buyer PRIOR to collecting the CD or attending the Briefing Session. Failing to do so will result in you not being granted access to the Briefing Session.

Tenderers must arrange own transport and parking. Tenderers failing to attend the compulsory tender briefing session will be disqualified. PRASA reserves the right to only allow tenderers in possession of a valid tender document at the

briefing. A maximum of two representatives per company will be allowed to attend the briefing. Tender documents (CD’s) are only available during the period stipulated above.

THE ONUS IS ON THE TENDERER TO PRINT THE DOCUMENT FROM THE CD DISC AND SUBMIT PRINTED TENDER DOCUMENTS WHEN SUBMITTING THEIR

TENDERS.

NB: IT IS MANDATORY REQUIREMENT FOR PROSPECTIVE SUPPLIERS TO BE REGISTERED ON THE CSD IN ALL REQUESTS FOR PROCUREMENT OF GOODS

AND / OR SERVICES.

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SPECIFICATION

1. SCOPE

This specification covers the work necessary for the PA Systems installation at Jacobs, Chatsglen, Bayview, Havenside, Fynnlands and Escombe station within Metrorail KZN region.

2. PROJECT SPECIFICATIONS

This specification will focus on the following critical areas:

a. Safetyb. Trenching for HDPE Pipes and Manhole Chambersc. Laying of Cable Conduitsd. Manhole Coverse. Speaker Poles – Yellowf. Speakersg. Speaker Bracketsh. Cables/Wiringi. Labelling and Electronic Terminationj. Enclosures – Exterior & Interior

3. SAFETY

Safety will not be compromised. The following must be complied to:

a. Safety on site is Metrorail’s top priority, therefore all work areas are to be demarcated with danger / reflective tape where the public could be in danger.

b. All work carried out by the Contractor shall be in accordance with the South African Bureau of Standards Code of Practice for the Wiring of Premises, SABS 0142, all other relevant health and safety regulations, e.g. Act 85 of 1993, E4, E7 and the requirements as laid down in this specification.

c. All material used shall be SABS approved and in accordance with relevant listed specifications.

d. Non - conductor ladder should be used on the platform.e. Contractor’s staff is not to work barefoot or with sandals. (Safety boots to be Used)f. All public areas are to be made and kept safe from building materials at all times.g. Contractor to ensure that all safety equipment including reflective vests with company name

are worn at all times.h. Contractors are to ensure that there is safe access for our commuters onto Metrorail property

at all times.i. The Contractor, the Contractor’s Staff or any other person employed by the contractor, shall

permit no crossing of railway tracks. Unless it is done under the supervision of an appointed Track master and Two Flagmen on site

Failure to adhere to safety requirements will result in all work on site being stopped until all the safety regulations are adhered to, resulting in penalties being imposed for late completion.

4. TRENCHING for HDPE PIPES and MANHOLE CHAMBERS

a. Cut tar or remove concrete paving where applicable to excavate 450 mm (W) X 650 mm (D) trenching.

b. This trench is to accommodate 3 X 110mm HDPE pipes.c. All trenching conducted must be done with the industrial road cutting machinery to ensure

neat edges.d. All trenching conducted must be in 40 metre sections or between manhole spaces.e. The contractor should take precaution when backfilling the trenches.f. Provision to be made for a 450 mm X 650 mm manhole precast chamber during trenching.

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4.1 Backfilling Material

a. The 3 layers of material in the backfilled trench are classified as bedding, padding and main backfill.

b. The bedding and padding material should not be too fine, and should be free of large stones (it shall be evenly graded between 0,6mm and 19mm). Clay type material is not suitable (the PI should not exceed 12 and compact ability factor should not exceed 0,4).

c. The in-situ material is not always suitable for bedding and padding and imported material may have to be used.

d. The material excavated from the trench can be used as main backfill if it is free from stones greater than 150mm, and if the possible subsidence of the trench is not an issue. If subsidence is an issue then selected materials may have to be used.

e. The backfill levels should include the following: 110mm of G4 sand Soil poison Backfill leaving 40mm for hot mix Prime Coatf. Damaged premix areas and concrete slabs, as a result of these activities, are to be repaired

by a contractor.

Fig. 1: Illustration of Bedding, Padding and Main Backfill Concept

4.2 Compaction of Bedding, Padding and Backfill Material

a. The correct compaction of the bedding and padding material is absolutely critical to ensure the integrity of the soil-conduit system. If the compaction process is not done properly, conduit deformation can occur.

b. The conduit must be supported on a continuous bed compacted to a depth of not less than 100mm over the full width of the trench. A vibratory plate compactor can be used for compacting the bedding. The padding must be placed in layers not exceeding 75mm thick and compaction must be executed manually using suitable tamping tools. Simultaneous filling and even compaction must take place on either side of the conduit.

c. The padding procedure must continue above the conduit to a depth equal to the diameter of the conduit and not less than 100mm above the conduit. The compaction of the main backfill can be done with a vibratory plate compactor in layers not exceeding 300mm thick.

d. The main backfill can be stabilised with cement under road crossings. (The degree of compaction for bedding, padding and main backfill shall be 90% of modified AASHTO maximum density The optimum moisture content should not vary by more than 2% to achieve maximum density).

e. Costs incurred due to poor workmanship when backfilling shall be borne by the contractor up to 6 calendar months calculated from the date of acceptance of completed work by the Project Manager.

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5. LAYING OF CABLE CONDUITS

a. Cable conduits should be laid as straight as possible between manholes and draw pits.b. During trenching, care shall be taken when placing the excavated soil so as not to cause

damage or nuisance of any description and the contractor shall take all precautions necessary to prevent damage to any other cables, rain water drainage systems, etc

c. All pipes being laid under Railway line shall be at a minimum depth of 800mm from the top of the formation

d. When the contractor trenches under the railway line an approved Track Master should be supervising this work.

e. The contractor should take precaution since any damages to the existing services will be for the cost of the contractor.

f. Should it be necessary to remove accumulated water from a trench, this shall be undertaken by the contractor at his expense and should be taken into account at the time of tendering. The contractor shall provide all pumps and appliances required to carry out this operation.

g. Prior to laying the conduit, the trenches shall be inspected thoroughly to ensure that they are free from any objects likely to damage the conduit either during or after laying operations. PRASA technical officer to do verification.

h. Once commenced, the whole of the conduit laying operation shall be followed through to completion as quickly as possible so as to cause the minimum of inconvenience and obstruction.

i. The 3 X 110 mm flexible HDPE pipes to be supplied and installed as follows: Yellow for telecommunication Green for Fibre Orange for electrical

6. MANHOLE COVERS

6.1 Polymer Frames

a. The frame should be properly and evenly “bedded” on the supporting structure on first installation and not tied down temporarily, pending on proper installation later. If the frame is loaded while temporarily improperly bedded, cracking of the frame is possible.

b. Reasonable care should be exercised during compaction of surfaces in the area immediately surrounding the manhole in order to avoid excessive lateral pressure, which could possibly cause damage to the frame.

c. Once permanently installed, frames should not be re-used after uplifting.d. Although reasonably flexible, the material is at the same time also relatively brittle and may

crack while being separated from the manhole structure.e. Cast iron covers should not be fitted to polymer concrete frames, as point loading could

damage the frame.f. Careless handling (dropping or throwing onto trucks) should be avoided, completely.g. As far as possible, the frame rim should be clear of sand, stones and other debris before

putting the cover back.h. Excessive material trapped between the cover and frame could cause rocking of the cover in

the frame, leading to eventual frame damage or failure.i. The frame should be properly and evenly “bedded” on the supporting structure on first

installation and not tied down temporarily, pending on proper installation later. If the frame is loaded while temporarily improperly bedded, cracking of the frame is possible.

j. Reasonable care should be exercised during compaction of surfaces in the area immediately surrounding the manhole in order to avoid excessive lateral pressure, which could possibly cause damage to the frame.

k. Once permanently installed, frames should not be re-used after uplifting.l. Although reasonably flexible, the material is at the same time also relatively brittle and may

crack while being separated from the manhole structure.m. Cast iron covers should not be fitted to polymer concrete frames, as point loading could

damage the frame.n. Careless handling (dropping or throwing onto trucks) should be avoided, completely.o. As far as possible, the frame rim should be clear of sand, stones and other debris before

putting the cover back.p. Excessive material trapped between the cover and frame could cause rocking of the cover in

the frame, leading to eventual frame damage or failure.

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6.2 Polymer Manhole Covers

a. The medium duty cover is manufactured with “lifting slots” which has plastic mouldings embedded in the cover.

b. Proper lifting keys should be used to lift the cover. These keys must be inserted into the slot and then can the cover be vertically lifted from the frame. Under no circumstances should force be used in an attempt to lift the cover. The slots are almost certain to be permanently damaged, making it extremely difficult to open the manhole in future.

c. As much dirt or sand as possible should be removed from the lifting slot before attempting to insert the lifting key. Forcing the key, could result in damage to the lifting slot and visual appearance of the cover.

d. The manhole cover should not be handled roughly. Although it is unlikely that the cover can be damaged, unsightly chipping will certainly occur.

e. All manhole covers should be black. f. These manhole covers must be fitted with a locking mechanism by the supplier.g. The following inscriptions must be on the face of these manhole covers: PRASA /

TELECOMMS & METRORAIL/ ELECTh. The classification of the MD 470 manhole is for the use of where heavy commercial vehicles

have no access.i. The MD 470 is designed for domestic walkways and on pavements and prohibits a vehicle

wheel where the loading bearing of that particular wheel exceeds 40 Kilo Newtons.j. Whilst it must be noted that in essence polymer is still a form of concrete, and therefore more

easily damaged than cast iron if carelessly handled or installed.k. The above guidelines should ensure that a minimum of operational problems are

experienced.l. Manhole covers must be levelled with the existing premix.

Typical manhole Cover and Frame (Polymer concrete) – Metrorail MD 470With locking mechanism

Illustration Fig 2: Typical representation of the MD 470

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Description Duty ClassFigure Force (kN) Value

Force (kN)Tolerence

Dimensions Factor

DimensionsValue (mm)

DimensionsTolerance

A 540 -2

Metrorail 470 Medium duty 40 5% B 70 +-2Walkways C 600 +-5

Pavements D 470 +-5Please note: This specific product has been tested and approved by SABS with the above load readings for medium duty. Only

manhole covers and frames that carry the SABS mark of approval can be installed. Any deviations from such request shall be rectified by the contractor at his/her cost until all the prescribed have been met with. A SABS certificate of

approval will NOT in isolation of the “MARK” of approval on the product be accepted.

a. Fig 3: Load Bearing Chart

7. SPEAKER POLES – GLASS FIBER-REINFORCED POLYSTER (GRP) POLE

a. Speaker poles to be constructed of Heavy Duty fibreglass pole, overall length 4.6 meter with stainless steel 76 mm diameter spigot, heavy-duty access door including gland plate and buried base plate with hook bolts similar or equivalent to K 187640.

b. Fibreglass pole is to be traffic yellow c. The pole shall be constructed by the filament winding process to achieve optimum results for

strength and rigidity. The filament winding process shall be continuously applied with uniform tension onto a rotating mandrel and shall result in a minimum mass glass to resin ratio of 70:30.

d. The surface shall be seamless, smooth and tapered.e. The material of the finishing coat shall be a gel coat that shall comply with the requirements

of SABS 141 and shall be applied to a uniform thickness of between 250 and 500 microns. f. It shall provide a weather-proof, UV resistant, and flame resistant and impact strong surface

in the colour specified.g. The pole shall be manufactured in accordance with SANS 1749 under the ISO 9002 quality

system.h. A cable entry with a minimum diameter of 34mm shall be provided at a minimum depth of

400 mm below the ground surface.i. A hot dipped galvanised gland plate, suitable for gland no. 0 or 1, complete with terminal

block and DIN rail for a miniature circuit breaker, shall be provided and shall be mounted to a bolt provided in the access opening.

j. Poles for direct embedment in the ground shall be provided with a 300 x 300 x 1.6 mm stainless steel base plate complete with 2 X stainless steel hook bolts and nuts.

k. Base mounted poles shall have a hot dipped galvanised flange plate that can be bolted to a foundation which shall be designed to withstand the forces the pole will experience in service.

RELEVANT POLE DATA AND OTHER FACTORS CORRESPONDING CALCULATED KEY VALUES

Total lengthof pole

m

Height of poleabove ground

m

Diameter ofpole at ground

levelmm

Load to beapplied inpole-top

deflection testN

Maximumpermitted

deflection inpole-top

deflection testmm

4.6 4.0 146 171.6 200

Figure 4: Speaker Pole Data Sheet

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8. SPEAKERS

8.1 Outdoor Speakers

a. Speakers to be manufactured of impact proof lightweight ABS resin enclosure with weather proof polyurethane resin paint and stainless steel brackets.

b. Must have horizontal constant directivity coveragec. Must be IP-65 Ratedd. Output rating must be 30 Watt (similar or equivalent to CS – 304)e. To be supplied with an additional 5m of 1.5mm cab tyre leads.

Typical Specification of the outdoor horn speaker

Rated Input 30 WRated Impedance 100 V line: 330 Ω (30 W), 500 Ω (20 W), 1 kΩ, (10 W)Sensitivity 98 dB (1 W, 1 m)Frequency Response 120 – 15,000 HzSpeaker Component 12 cm cone-typeHorizontal Directivity Constant directivity horn 90 degrees (+/- 45 degrees horizontal

from front axis)Speaker Cord 2-core cabtyre cord with diameter of 6 mmDust/Water Protection IP65Finish Horn cover: ABS resin, off-white paint

Bracket: Stainless SteelScrew: Stainless steel

8.2 Internal Speakers

Typical Specification of an internal speaker

Rated Input 6 W (100 V line)Rated Impedance 100 V line 1.7 kΩ (6 W), 3.3 kΩ (3 W)

70 V line 1.7 kΩ (3 W), 3.3 kΩ (1.5 W)Sensitivity 91 dB (1 W, 1 m)Frequency Response 120 – 15,000 Hz (-20 dB)Speaker Component 12 cm (5”) cone-typeConnection Push-in connector (bridging terminal)Attenuation level 3 W: OFF, 1(-12 dB), 2(-6dB), 3 (0dB)

6 W: OFF, 1(-13 dB), 2(-7dB), 3 (0dB)Operating Temperature -10℃ to +50℃ (14゜F to 122゜F)Dimensions 173 (W) x 195 (H) x 101 (D) mm (6.81” x 7.68” x 3.98”)Wall Mounting Dimensions

Case front mount: 184 mm (7.24”)Fixing hole mount: 120 mm (4.72”)

Weight 810 g (1.79 lb)

9. SPEAKER BRACKETS

9.1 Grades of Metal

a. The speaker bracket should be manufactured of Stainless steel metal. The stainless steel utilized should not be less than the grade 304/L.

b. The Typical representation of a speaker bracket is illustration on figure 5 below and must be fitted as such at all times.

9.2 Finishes

a. The speaker bracket should be reflectively highly polished and not chromed. b. All completed brackets will be subjected to random testing for the quality of finishes and

grades of stainless steel metals used and supplied.

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c. All edges and burrs around tapped holes should be appropriately removed ensuring that it will not cause any injury, cuts or harm to person/s handling such.

d. The aesthetics should not be compromised.e. All welding work must be also polished at the same quality of the general bracket area.f. The stainless steel used to manufacture these brackets should carry a 30 year warranty

period against any deterioration in the form of discolouring or surface rust.g. 3 X grub screws with Allan heads be supplied and fitted on the bracket.h. 4 X 30mm stainless steel “Nut and Bolt” to be supplied and fitted on the bracket to secure the

speaker.i. Dimensions given must be accurate and leaves no room for any tolerance.

Fig 5: Typical representation of the Speaker Bracket

10. CABLES/WIRING

a. All cables used, shall be 600/1000 V rating and shall be in accordance with SABS 150.b. All multicore cables shall be PVC insulated, PVC sheathed, single wire armoured and PVC

covered.c. The armouring shall incorporate a percentage of copper wires in accordance with clause

5.8.3C of SANS 150.d. Cables shall be installed in 110 mm PVC Ductinge. All cable routes shall be confirmed with the Project Manager, prior to commencement of

installation. f. No joints shall be permitted, unless approved by the Project Manager. g. Joining shall be done with acceptable jointing kits, by a qualified jointer.

11. LABELLING & ELECTRONIC TERMINATION

a. All materials and components utilized and installed shall be labelled with labelling material.b. It should be of a type that is water proofed and does not easily deteriorate when exposed to

various elements and weather conditions. c. When cables are to be labelled, it should be done at every 2 (TWO) meters and junction or

termination points/boxes. d. The final prints for labelling is to be some of the following examples: “TELECOMS” or “PA

SYSTEM”e. The oval grip cable markers are to be utilisedf. Coding A - Z and 0 - 9.g. International colour coding.h. May be filed directly on the cable or alternatively onto “Arrow Tags”.i. All conduit and conduit accessories to be P.V.C, SANS approvedj. All conduit work to be saddled at 1000 mm intervals.k. Saddles to be PVC Hospital Type l. Saddles to be fastened to the steel girders with 4 mm Brass machine screw and nut.m. Wiring in enclosure to be terminated with the use of Boot lace insulated ferrules at terminal

connectors.

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12. ENCLOSURES – EXTERIOR & INTERIOR

a. The below enclosure to be stainless steel SS 304.b. It must be Hairline finished.c. The boxes must have a double folded gutter at door frame to increase rigidity and prevent

water from entering while door is opened.d. The concealed hinges must provide 120 degree door opening.e. The boxes must have a polyurethane one piece gasket on door panel to provide continuous

seal.f. Earthing facilities on the door must be provided for body and mounting plates.g. The enclosure to have din rail mounted on the inside with 8 din connectors.h. Ensure that enclosures are fitted with device plates.

FIG 6: Exterior IP 65 (IEC 529) – wall mounting enclosures

13. PENALTIES

a. In the event of the Contractor failing to complete the work on or before the completion date, the Contractor shall pay to Client as penalties the amount of R 200 (Rand) for every day thereafter that the work remains uncompleted. In addition the Client shall have the right to complete the work and to recover from the Contractor all the expenditure incurred in so doing.

b. Penalties will also be incurred, if trains are delayed by contractor in the event that the contractor exceeds the agreed occupation time. The penalty will be R 80 per minute train delayed. It must be noted that the delays to the peak Metrorail train service can affect many trains in a short time, and it is required that the contractor stick to the agreed occupation times.

14. WORK PROGRAM

a. The contractor shall issue a work program which shall be agreed upon and signed by the project manager a week after award of this work.

b. When the Contractor considers additional time, for any reason, to complete the WORK or portions of the WORKS, he shall inform the project manager, setting out in detail the reasons and stating the specific additional time required. Such additional time will only be authorized by the project manager in writing or penalties will be applicable as per the penalty clause.

15. DURATION

a. Metrorail KZN requires that the Work be completed by the 6 months from the date of acceptance (maximum six months for the installation and the commencing of the work) which period shall include any statutory and builder’s holidays falling within this period. The completion date will be determined by adding the period specified above to the date of written

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notification of acceptance of tender, or to such later date as may be specified in the advice of award. Lead-time has been built into the period specified

16. Precondition – Documents to be supplied together with the tender document

The following items on the technical evaluation are compulsory and should be part of the submission.

a. Qualified Track Master certificateb. Flagman certificate x 2c. C-green certificated. Supporting documentation stating relevant previous experience with traceable references e. Method statement covering ,at least, the following items:

Introduction Scope Abbreviation Personnel Machinery, Equipment & Tools Procedure Environmental controls Cosmetics Reference

END OF SPECIFICATION

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