Section C (part2) - Section9 - M&E Equipment.pdf

TECHNICAL SUBMISSION PROJECT SPECIFICATION SECTION C PART 2 SECTION 9: M&E EQUIPMENT

IA 12/13 C 057 ST C3/S9/1 February 2013 Construction and Upgrade of Rayyan Road Project 7: Contract 1 West of New Rayyan R/A to East of Bani Hajer R/A

PART 1 GENERAL 1.1. GENERAL MECHANICAL AND ELECTRICAL REQUIREMENTS 1.1.2 Related Works Add the following:

Section 29 Approved Suppliers

Add the following to sub-clause: 1.1.16 Environment 1 Temperatures:

Maximum recorded shade temperature 52 deg C Average maximum shade temperature 46 deg C Average minimum shade temperature 20 deg C Normal winter minimum temperature 12 deg C Minimum winter temperature 0 deg C Maximum sun radiation temperature 84 deg C

2 Humidity:

Absolute maximum relative humidity 100% Absolute minimum relative humidity 0%

. All equipment/systems shall be suitable for the harsh environmental conditions and hazardous areas (due to potential danger of flammable gases in the locality) and shall have a minimum life of 15 years.

1.2 PRODUCTS 1.2.2 Workmanship Add the following new item: 2 The Engineer reserves the right to instruct the Contractor to remove damaged

equipment from the site should he consider the equipment is irreparably damaged or the remedial measures cannot be completed satisfactorily under site conditions.

1.2.14 Name plates and Data plates Add new items as follows:

2 Items of plant, i.e. isolators, starters, distribution boards, junction boxes, timers,

fuses, etc., shall be clearly labelled to correspond with the appropriate schematic or wiring diagram.

3 Labels shall be fixed to equipment prior to any testing being carried out.



4 Unless specified elsewhere, labels shall be manufactured from 3 mm thick troffolite with engraved 5 mm high lettering; the colour shall be white letters on a black background.

5 Internal labels must be visible at all times and must not be obscured by panel wiring,

etc. 6 Warning labels shall be engraved to give black letters on a yellow background, and

be preceded by the lightning flash symbol in accordance with BS 5378. 7 Internal labels shall be fixed with round or cheesehead stainless steel screws. Self-

adhesive labels will not be accepted. 8 External control panel labels are to be fitted with black plastic rivets. 9 Internal labels designating components shall be fixed to non-removable equipment. 10 All labels shall be engraved in both English and Arabic. The text of all labels shall

be submitted to the Engineer for approval before the labels are manufactured. Add the following new Sub-Clause: 1.2.19 Spare Parts and Tools 1 Spare parts and tools for the various items of equipment shall be provided as

specified. 2 The spare parts and tools shall be stored in a lockable hardwood cabinet mounted

on the wall of the pumping station storeroom. 3 The cabinet is to be of robust construction with heavy duty brass hinged doors and a

heavy duty brass hasp and staple locking mechanism. Sufficient internal fittings shall be provided within the cabinet to enable the neat and safe storage of spare parts and tools. The cabinet shall be finished off with three coatings of an approved clear varnish. The Contractor shall supply and install the complete cabinet, including a brass padlock and three sets of keys.

1.3.5 Installation Add new items as follows:

5 Where heavy items are to be lifted, padded slings or other suitable alternative shall

be used to prevent damage to the corrosion protection system. The use of uncoated lifting chains or cables shall not be permitted.

6 The equipment shall be inspected by the Engineer prior to installation. Damaged

equipment shall be repaired prior to installation taking place in accordance with procedures approved by the Engineer.

1.3.6 Testing and commissioning Add new items as follows:



7 Testing at works

A. The Contractor shall carry out tests as stated in the current appropriate British Standard where available. These shall include:-

(i) BS EN 60439 -Factory Built Assemblies (FBA)

(ii) BS 599 -Methods of Testing Pumps

(iii) BS 5316 -Acceptance Tests for Centrifugal, Mixed Flow and Axial Pumps

(iv) BS 5000 -Rotating Electrical Machines B. Performance tests and such other tests shall be carried out to determine that

the Works comply with the Specification under test conditions, in the Manufacturer's works, and on Site.

C. The Contractor shall provide any labour, equipment and apparatus required

for testing purposes. Test instrumentation shall have current 'Calibration Certificates' and shall be suitable for the degree of measurement accuracy necessary for the parameters being checked.

D The Contractor shall ensure that the equipment and apparatus required for

these tests shall be suitable for the degree of measurement accuracy. E. No inspection or passing by the Engineer of the Work, Plant or materials

included in this Contract, whether carried out or supplied by the Contractor shall release him from any of his obligations under the Contract.

8 Manufacturer's Works Tests

A. Before despatch from a Manufacturer's works each item of Plant shall be

tested in accordance with the relevant Standards Specification or Code of Practice. In the absence of such Standards or Code of Practice the tests shall be performed in a manner subject to the approval of the Engineer. The Engineer shall be given the opportunity to inspect any Plant he deems necessary. The Contractor shall give the Engineer at least 3 weeks notice of the tests being carried out. No tests or inspections shall be carried out before the Contract drawings are approved.

B. Whether witness tests are required or not, three copies of test certificates

and curves shall be supplied to the Engineer within two weeks of completion of any tests. No item shall be despatched before the Engineer has approved such a certificate in writing.

C. The Contractor shall meet all costs incurred by the Engineer when attending

agreed inspections. These costs shall be drawn against the relevant Provisional Sum in the Contract.

D. All costs incurred by the Engineer on repeat tests or inspections of failed

Plant shall be met by the Contractor.



E. The tests shall include, but not necessarily be limited to, the following:

(i) Panels.

The following routine tests defined in BS EN 60439 -1 shall be carried out:

(a) Inspection of the FBA including inspection of wiring and electrical operation tests.

(b) Dielectric test (2500 V ac for 60 s minimum).

(c) Checking of protective measures including primary or secondary injection testing and checking the continuity of the protective circuit.

(d) Loop test instruments.

(e) Functionally test control circuits.

(ii) Lighting and small power.

(a) Visual inspection of equipment and protective devices for compliance with drawings.

(b) Continuity.

(c) Insulation resistance test at 500 V DC between line and neutral line and earth, neutral and earth of each final circuit, polarity check and discharge test on all emergency lights.

(d) Loop impedance and circuit breaker test.

(iii) External lighting.

(a) Insulation resistance checking of all equipment.

(b) Pilot energisation functional check of lamps and control.

(iv) Pump units.

(a) The Contractor shall carry out Works Witness Tests in accordance with BS 5316: Part 1 1976 Class C on one of each type of pump. Only results in the positive tolerance output area will be acceptable.

(b) The tests shall be conducted over the full head/flow range of the pump curve from closed valve to runout, and one of the test points shall be at the duty point, or duty points, specified in this document. The pumps shall be tested with their contract motors. Guaranteed efficiency is required at the duty point. The combined pump and motor efficiencies quoted by the Contractor in the Schedules shall be achieved.

(c) A test report including the items detailed below shall be submitted to the Engineer at the conclusion of each test.

Place and date of the acceptance test Manufacturer's name, type of pump, serial number Duty point(s) specified in this document



Description of the test procedure and the measuring apparatus used including calibration data observed readings presented in tabular and graph format, evaluation, analysis of test results and conclusions

(d) The pump's compliance with the Specification shall be based upon their performance during the Works Witness Test. The Contractor shall undertake further in-situ testing on pumps. These tests shall be to demonstrate the material integrity of the pump, and the ability of the system to deliver the required flow.

(v) Motors.

(a) Motors from manufacturer's standard range will be accepted with a type test certificate. Motors without a type test certificate shall be tested under a load test including an 8 hour "heat test".

(vi) Lifting appliances.

(a) Cranes and other lifting devices shall be load tested in accordance with the Standard Specification and statutory requirements and a test certificate issued.

(vii) Pressure vessels.

(a) Pressure vessels shall be pressure tested in accordance with the Standard Specification and statutory requirements and a test certificate issued.

(viii) Valves and pipework.

(a) Valves and pipework shall be pressure tested in accordance with the specified standards.

(ix) Inverters (soft starters and heat run tests).

Pump inverters shall be Works Witness Tested. A suitable correction factor shall be applied in respect of the ambient temperature during the test, and the temperature of the air from the air conditioning unit during normal service.

9 COMMISSIONING

A. Prior to undertaking the equipment commissioning tests in the presence of

the Engineer, the Contractor shall first complete a cold commissioning and thereafter a hot commissioning to determine that the plant is operating in accordance with the specifications.

B. Cold commissioning shall comprise all the necessary checks to ensure that

the installation is complete and the electrical supply and all other components are correctly connected. The equipment shall not be energised (hot commissioned) until the Contractor submits a completed schedule of the items checked to the Engineer for approval. The Engineer may require the



Contractor to conduct additional checks should he consider that insufficient checks on the equipment have been undertaken.

C. Hot commissioning shall be undertaken by the Contractor to ensure correct

operation of the equipment. All aspects of the equipment operation shall be checked and verified during the hot commissioning. Any faults detected shall be rectified prior to arranging the final commissioning of the equipment in the presence of the Engineer. A hot commissioning report shall be submitted to the Engineer for approval prior to arranging the final commissioning. The Engineer may or may not attend the hot commissioning

D. Final commissioning shall take place after the approval of the hot

commissioning report. Data included in the hot commissioning report shall be checked against the values obtained in the final commissioning.

E. Where the final commissioning of the equipment is unsuccessful, the costs of

rearranging and conducting further commissioning meetings with the Engineer or the Employer will be for the Contractors account.

F. The equipment shall only be accepted once the Contractor has satisfactorily

demonstrated the reliability of the equipment and its operation in conformance with the specification.

Add new clause as follows: 1.4 OPERATING AND MAINTENANCE MANUALS AND INSTRUCTIONS

1.4.1 The Contractor shall supply 4 copies of operating instructions for apparatus installed

under the Contract including service, maintenance and spare parts. Instructions shall also include step directions for minor fault finding and periodic maintenance instructions such as cleaning, oiling etc. for all equipment supplied under this contract together with instructions for removal and reinstatement.

1.4.2 Four complete Operating and Maintenance Manuals and Instructions shall be

submitted no later than 4 weeks after the successful commissioning of the equipment. One draft copy of the Operating and Maintenance Manuals and Instructions shall be submitted to the Engineer for review and approval 4 weeks prior to the installation of any equipment. Upon approval of the draft copy the four Operating and Maintenance Manuals and Instructions shall be submitted. The Contractor shall include all the documentation requested.

1.4.3 The Operating and Maintenance Manuals and Instructions shall be written in English

or Arabic and English and in the following format:

A. Cover similar to the cover of this tender document providing a full description of the project name, description, project number, project code, budget reference, pumping station name and shall be titled Operating and Maintenance Manuals and Instructions Volume - o f -.

B. Complete Index and Drawing List. C. Section 1- List of Contractors and contact details, together with the Scope of

Works.



D. Section 2-Detailed description of the operation of the plant providing all duties, set points, pressure readings, electrical current readings, safety checks etc.

E. Section 3-Summarised data sheets for the major items of the plant, including

Manufacturers name and contact details, name plate data, serial numbers, capacities, sizes, power ratings, and any other information deemed necessary for the ordering of replacement parts from the Manufacturers.

F. Section 4-Detailed maintenance requirements including frequency of

checking, types of lubricants, replacement part numbers, recommended spares to be kept by the Employer and any other information deemed necessary to ensure the equipment is maintained to provide satisfactory service.

G. Section 6-Original Manufacturers brochures of all the items installed. H. Section 8-Factory test data records and commissioning data. I. Section 9-Electrical component lists and cable schedules. J. Section 10-Mechanical As built drawings. K. Section 11-Electrical As built drawings, wiring diagrams and cable

schedules. L.. Pump design calculations M. Rising Main details (location, materials and profile) N. Discharge Chamber details

1.4.4 The Operating and Maintenance Manuals and Instructions shall submitted in hard

backed binders of suitable quality to withstand the anticipated frequency of use at the site for the life expectancy of the installed equipment. Ring type lever arch files are not acceptable.

1.4.5 Complete O&M Manual and Instructions also to be provided in Digital format. 1.4.6 The Plant shall not be deemed to be Taken Over until such time as the Operating

and Maintenance Manuals and Instructions have been submitted and accepted.



PART 2 SUBMERSIBLE PUMPS 2.1 GENERAL 2.1.1 Scope

Add the following to item 2 Section 29, Approved Suppliers 2.2 PRODUCTS 2.2.4 Fabrication

Delete item 3(e) and replace with the following: (e) single/multi vane, open or shrouded (closed) or spiral vane type, Vortex type (free

flow) impellers will be allowed only if the specified duty cannot be provided by using the preferred impeller type. In this event a written statement to this effect from the pump manufacturer should accompany the proposal.

Add the following new clause:

2.4 PUMP OPERATION AND CONTROL

1 The pumps shall be operated in manual (hand), automatic (auto) or off mode. A selector switch for each pump shall be provided to select the operating mode.

2 In automatic mode, the pumps shall be started and stopped by a suitable and

approved bubbler level controller unit. The pumps shall operate in duty/duty assist mode.

3 Pumps operation levels are indicated in the drawings A low level sump cut out and warning shall be incorporated in the control circuit to

make the pumps inoperable should the pump sump become dry. The low level cutout shall be operated by both the hydrostatic level controller and a dedicated backup float switch.

A high level flood warning alarm shall activate when the wet well flood reached the

high level flood set point level. In the event that the level in the sump does not reach the pump duty level after 4

hours, a timer shall automatically start the duty pump until the low level set point is reached.

4 In manual mode the pumps shall be operated by manually depressing start and stop

pushbuttons located on the MCC panels. The pumps shall not be able to be started in manual mode if the level in the wet well is lower than the automatic pump stop level. The low level cut out as specified in item (4) above shall operate in the manual mode. An override switch shall be provided to enable the water level to be drawn down from the automatic stop level to the low level cut out.



5 The non-return valve on each branch of the delivery pipework shall be fitted with extension arms, counterweights and limit (proximity) switches to enable the no flow condition to be monitored. Under conditions of no flow, the pumps shall be required to switch off after continuous no flow conditions of one minute. The no flow protection facility shall automatically reset after 5 minutes to enable the pumps to be restarted in automatic or manual mode. After five attempts at restarting the pumps, the pumps shall not be able to be restarted until such time as the no flow protection has been manually reset. The no flow protection shall be operational under both manual and automatic operating modes.

6 One pump shall be selected as the duty pump, one pump as the assist pump. A

manual selector switch shall be provided to select the duty and assist pump arrangement.

7 In the event that the duty pump fails to start, fails under conditions of no flow, fails to

start at the high level or fails due to electrical overload, the assist pump shall be required to start automatically and continue to operate as the duty pump until the selector switch is reset. The standby pump shall then operate as the assist pump. In the event that the assist pump fails to start, the standby pump shall be required to start automatically and continue to operate as the duty pump until such time as the selector switch is reset.

8. Each pump shall be stopped or unable to be started in either operating mode should

the corresponding emergency stop button be depressed



PART 7 LIFTING EQUIPMENT 7.2.6 Manually Operated Chain Blocks

Delete items 1 to 8 and replace with following items 1 to 5 and renumber items 9, 10, 11 to 6, 7 8:

1 The hoisting wheel shall be grooved and pocketed to receive the load chain. The

load chain shall be alloy steel chain Grade 80 to BS 3114: 1959. Hand chains shall be to Grade 30 BS 590 or better. Chain guides shall be provided to ensure effective guidance of the load chain into the load chain wheel pockets. A stripper shall be provided to ensure effective disengagement of the load chain from the load chain wheel. Blocks shall be provided with chain guides and the idler wheel scores shall be so shaped as to avoid twisting the chain as it passes round. The pitch diameter of the idler wheels shall not be less than 16 times the size of the chain, unless they are so shaped as to avoid a bending action on the link.

2 The load chain anchorage associated fittings and framework at the slack end shall

be at least equal in strength to 2.5 times the maximum tension in the load chain when the working load limit is being lifted. Any link used for connecting the load chain to a terminal fitting shall be of the material specified for the chain and heat treated to provide mechanical properties and strength equivalent to those of the load chain. The hook shall be made from high grade forged steel complying with BS 2903 C type and provided with a safety catch. The safe working load shall be marked on the hook in kilograms in accordance with BS2903.

3 The sheaves of the hook block shall be guarded to prevent a hand or fingers being

trapped. 4 The crab hoisting gear shall be such that one man is capable of easily raising the

maximum load. 5 A chain collecting box shall be incorporated. 7.2.8 Mechanical Components Delete item 1 and replace with the following:

1 End Carriages

(a) Both end carriages of electric operated cranes shall be powered either by a duplicate geared motor drive or by a single motor unit and a lay shaft system connecting the two carriages.

(b) The end carriage of manual operated cranes shall be connected by a lay shaft system and longitudinal and cross traverse motions shall be provided on the crane and shall be such that operation is speedy without impairing safety in working. The longitudinal and traverse motions shall be operated by means of hand chains which shall extend to within 600 mm of the operating floor. The hoisting and lowering chains shall be of the same length. The hook and load chain shall be such that the hook will reach to the lowest floor or duct level. The operating chain for the longitudinal motion of the crane shall



be suitably positioned to enable the operator to move the unit easily without dragging the operating chains over the control panels or other equipment.

(c) The runner wheels shall be of cast steel, with double flanges, and shall be mounted on roller bearings or fitted with phosphor-bronze bushes running on hardened steel axles.



PART 22 VENTILATION SYSTEMS 22.1 GENERAL 22.1.1 Scope Add the following to item 2: Section 29 Approved Suppliers 22.2 VENTILATION SYSTEMS Add new clauses 22.2.8 and 22.2.9 as follows: 22.2.8 Split Type Air Conditioning Units 1 Wall mounted split type air conditioning units shall be provided for air conditioning of

the MCC/Control room and Store Room. The system shall handle predominantly recirculated air with a controlled quantity of fresh air introduced at the unit. The indoor unit shall be wall mounted type and include filter, cooling coil, fan and suitable matching condensing unit mounted on the external side of the MCC/Control room. All necessary power and control cabling, interconnecting copper refrigerant piping duly insulated, condensate piping etc shall be provided. Each MCC room shall be provided with a minimum of two units of 2.0 TR capacity each. The sizing of the units to be verified by the contractor based on maximum ambient conditions, external loads and the internal loads/ heat dissipation from the panels. The final selected unit capacities to be submitted for approval.

2 All items of plant and equipment for building services shall be designed to operate

without malfunction up to a maximum ambient condition of 52 oC dry bulb and a minimum ambient condition of 1 oC dry bulb with instances of 100% relative humidity.

3 The air conditioning system shall be capable of maintaining internal conditions in the

MCC/Control room within the following bands:

(i) 22 +/- 1 oC dry bulb (ii) 40 - 55 % relative humidity 4 The maximum acceptable sound level in the air conditioned space shall have a

Noise Rating (NR) of 40. The room temperature control shall be via a wall mounted thermostat/off-fan-cool control unit located within the MCC room.

5 The refrigerant used in air conditioning plant shall be R 22/ R 134a/R407c. The

condenser coil shall be chemically treated to resist corrosive environment. 6 Condensate water shall be piped from air conditioning units to approved drainage

points. The free discharge of condensation onto the ground shall not be permitted. 7 The approved makes of air conditioning units are Carrier, York and LG. Only units

from approved Manufacturers shall be accepted.



22.2.9 Ventilation during maintenance 1 Provide minimum 5 air changes per hour during any activity inside the attenuation

tank. Allow sufficient time before actual access to the tank for refreshing air inside. Use portable gas detectors for checking harmful gases concentration before service personnel enters the tank.

2 Provide temporary ventilation for the maintenance period. Fabricate ventilation shaft

covers equipped with a flange for connecting an exhaust fan. Minimum fabricate three covers compatible with fans to be used for ventilation. Submit fan and cover of each type for the Clients approval before cover fabrication.

3 Provide exhaust fans as follows: minimum three nos 3,600 cfm at 1 wg to be used

for tanks ventilation. 4 Both covers and fans shall be delivered to the Drainage Affairs Maintenance

Department store.



Add new Part 23 as follows: PART 23 CABLING AND WIRING 1 Cables shall be 600-1000 volt grade for LV application and 12.7 kV / 22 kV for HV

application. The following types of cables shall be used:-

(a) Cables for general power distribution within buildings, and all cables underground, shall be wire armoured, stranded copper cored, XLPE insulated, PVC sheathed cables, complying with BS 5467 characteristics.

(b) Cables run in conduits and trunking systems, shall be stranded copper cored PVC insulated cables, complying to BS 6004.

(c) Unless otherwise specified by the equipment Manufacturer, signal cables shall be PVC/SWA/PVC multi-pair cables complying to BS 5308 and shall be used for instrumentation/telemetry circuits. Conductors shall be single strand 0.9 mm diameter. An overall screen shall be provided.

(d) For HV voltages, stranded sectored copper conductors XLPE insulation, PVC bedding, galvanised steel wire armouring and an overall PVC sheath cables complying with IEC 502.

2 Cables shall be selected such that the voltage drop does not exceed the maximum

value defined in BS 7671 (Institution of Electrical Engineers Regulations for Electrical Installations) and regulations of Qatar Electricity Authority.

3 The minimum size of conductors used shall be 1.5 mm2 for control circuits including

programmable controller wiring and 2.5 mm2 for power circuits. These minimum conductor sizes will not apply in the case of instrumentation/telemetry circuits where smaller conductor sizes and special cables may be appropriate.

4 Cables, except those laid in ground, running in cable troughs or in ducts, shall be

firmly supported and fixed.

(a) Single runs of PVC sheathed armoured cables shall be supported using PVC cable clips. Multi-cable runs of PVC sheathed armoured cables shall be fixed onto heavy gauge hot dipped galvanised steel cable trays and supporting steelwork.

(b) Non armoured PVC cables shall be installed in conduits or trunking.

5 The trunking and perforated cable tray shall be selected to form a continuous support for cables. The trunking and tray shall be installed to form a complete, continuous system by the use of Manufacturers standard fittings and devices where there are any changes in direction, elevation or branches. The Manufacturer shall supply all cable trunking/tray risers fittings such as flat bends, equal and unequal tees, fourway cross pieces and offset reducers. Also any accessory items required such as dividers, brackets, clips, earth continuity connectors, flexible (expansion) couplers and covers shall also obtained from the same Manufacturer. Trunking is to be manufactured from either mild steel or PVC and shall confirm to BS 4678. Cable trays shall be manufactured from mild steel. Mild steel trunking and cable trays shall be hot dip galvanised.



Where the trunking or cable trays are cut, drilled or where the galvanising is damaged in any way the surfaces shall be adequately treated to restore them to the original galvanised standard. The number of cables installed in the trunking shall not exceed that recommended in BS 7671 (IEE Regulations), and the resulting space factor shall not exceed 45%. The fixing of trunking and cable trays and the installation of cables into or on trunking and cable trays shall be carried out using the manufacturer's approved accessories and fixings only. Such accessories and fixings shall be either manufactured from non-corrodible materials or supplied suitably coated to render them non-corrodible.

6 Conduits for occupied areas shall be concealed; conduit for unoccupied areas shall

be surface mounted. Conduits within buildings and structures shall be extra super-high impact heavy gauge uPVC conduit, installed with solvent welded joints and shall be installed with screwed fittings. Conduit systems shall conform to BS 4607, BS 4568 and BS EN 50086 as appropriate, and the number of cables installed shall not exceed those recommended in BS 7671 (IEE Regulations). The conduit system where it passes through the building structural expansion joints, suitably rated/sized expansion couplers shall be used in order to absorb the expansion/contraction. Fixings and accessories associated with conduit systems shall be either manufactured from non-corrodible materials or suitably coated to render them non-corrodible. No conduit shall be smaller than 20 mm diameter.

7 Cable runs shall be continuous throughout. Jointing shall not be carried out in

conduits or at drawing points under any circumstances. Draw-in boxes shall be spaced so that there is not more than two solid bends, or their equivalent, or more than nine metres of straight run between draw-in boxes.

8 Flexible conduits shall be provided for connection to mechanical equipment.

9 The Contractor shall be responsible for all work associated with cabling including

but not limited to trenching, ducting under roadways and backfilling of trenches. 10 Cables shall be laid at a depth of not less than 500 mm or not more than 1000 mm

below the surface of the ground. The bottom of the trench and the first 250 mm of backfill shall be fine sand free of stones or other sharp objects. Where cable trenches pass through stone fill, the cable shall be laid on an 80 mm thick bed of sand. After laying, the cable shall be covered by a further layer of sand to a depth of 80 mm above the top of the cable. Where sand is likely to leach away, a suitable membrane shall be fitted.



Interlocking PVC cable tiles shall be laid after backfilling a layer of sand at a depth of 400 mm from the finished ground level throughout the cable length and a continuous warning tape shall be laid over the width of the cable trench 250 mm below ground level. The tape shall be heavy gauge polyethylene marked 'CAUTION ELECTRIC CABLE BELOW', in English and Arabic. Cable route markers shall be installed at all changes of direction and at road crossings, and shall have their positions marked on the 'as installed' cable route drawings. Each marker shall be a block of concrete approximately 300 mm square by 150 mm, permanently marked 'ELECTRIC CABLES', in English and Arabic, with arrows showing the directions of the cable route. Cables laid under or through roadways, footpaths, structures or buildings shall be installed in ducts. 50% spare duct capacity shall be provided subject to a minimum of one spare duct, and a maximum of 5 nr spare ducts at each duct installation. Cable trenches shall be adequately supported and kept free of water whilst cable laying proceeds. Where cables pass from made up ground into a fixed structure, sufficient allowance shall be made to cater for subsidence and ground movement.

11 Cable ducts supplied under the Contract shall be rigid Class E uPVC pipe with

rubber ring joints and be not less than 100 mm diameter. Cable ducts shall be complete with nylon draw wires (min 1 kN). The draw wire shall be retained in the duct after installation of the cables. Cable ducts shall be sealed at both ends where they enter buildings in draw pits, or where the end of the duct is visible, using an expanding polyurethane foam impervious to water, gas and vermin on completion of the installation. The length of the foam plug shall be a minimum of 300 mm. Where cable troughs are provided they shall be shown on the cable routing drawings. The Contractor shall include for removing and replacing covers as necessary for the installation of the cables. On completion of the cable installation all entries and exits to the troughs shall be sealed using an expanding polyurethane foam. Cables shall be laid with suitable spacing. Cables and cable cores shall be identified at both ends by means of sleeve bands bearing the cable/core reference number which shall relate to the reference number shown on the drawings. Where multiple cables are laid in troughs, ducts, clipped on tray over long runs or laid in ground close together, intermediate markings to identify specific cables shall be applied. Where cables are installed in ducts, the cables shall be identified with the cable reference number within each cable draw chamber or at each end of the duct. Identification and markers shall be approved by the Engineer.

12 Armoured cables shall be terminated at plant and equipment items using brass

armour lock glands which conform to BS 6121. All glands shall be fitted with PVC



shrouds. For external applications all glands shall be type EIW and for internal applications type CW.

Where the above type of glands are not suitable for a particular application the requirements shall be as approved by the Engineer.

13 Fire Barrier All apertures and ducts to be sealed with approved fire-resistant filling.



Add new Part 24 as follows: PART 24 PLANT EARTHING 1 For the earthing of electrical systems, equipment and structures, each installation

shall have one common earth conductor connected to at least two groups of earth electrodes.

2 The earth resistance of the electrode shall be as low as is practicable but shall in

any event be such that the electrical resistance between the main earth grid and the general mass of earth shall not exceed 4 ohm when any one group of electrodes is disconnected.

3 The earth grid shall extend throughout the installation in the form of a main earth

ring with branch interconnections to the equipment and structures to be earthed. The earth connections shall comprise earthing conductors made up of wires of stranded copper with overall green/yellow PVC covering.

Earth electrodes shall be suitable material which guarantees low resistance and long life. Copper electrodes shall not be used in areas with impressed current cathodic protection.

4 The connections between electrode heads and conductors shall be so executed that

easy inspection and testing of the earth resistance of individual electrodes is possible.

5 All bare parts of underground earthing conductors shall be suitably protected against

direct contact with the soil so as to prevent electrolyte corrosion of plant equipment. All earthing terminations shall be made with compression-type cable lugs. Interconnections shall be directly clamped with compression-type branch connectors or 'cad-welded'.

6 The main earth conductor shall have a cross sectional area such that it can act as

the circuit protective conductor on all plant and equipment connected to it. At the point of electricity supply it shall be solidly connected to the earth terminal conductor or site earth terminal to achieve a TN-S system.

7 Electrical plant and equipment external to the Switchgear and Control Rooms shall

be connected to an extended main earth conductor. Cross bonding between extraneous metalwork, and metal supporting structures for the plant and equipment shall also be connected to this main earth terminal conductor.

The conductors from electrical plant and equipment to the main earth conductor shall be treated as circuit protective conductors as described in BS 7671 (IEE Regulations) as applicable. The cross bonding conductors shall be as described in BS 7671 (IEE Regulations) as applicable.

Subcircuit protective conductors (CPC's) and bonding conductors shall be continuous throughout their lengths wherever possible. Cable armouring and cable sheaths are not acceptable as the CPC where equipment is installed.



8 At each earth electrode, pre-cast chambers with removable cover and installed flush with the finished ground level shall be provided. These should be commercial quality and fitted around approved earth rods.

9 Joints from sub circuit protective conductors to the main earth/CPC shall be made

with compressed joints. Every joint shall have a warning plate securely attached which shall state, in English and Arabic: Safety Earth and Circuit Protective Conductor. Do Not Remove. Joints shall be readily accessible for inspection. Where cable troughs are used for installation of the CPC, the joints may be made within the trough. Where the cable installation and CPC are installed underground, CPC joints shall be made in above ground link boxes.

10 The minimum size of conductor for any external earthing connection i.e. outside of

an equipment enclosure shall be 6 mm2. 11 Metalwork within 2.5 m of any other metalwork, plant and equipment which can be

energised, or forms part of any other equipotential zone, shall be bonded to the CPC/Earth System, and shall have a warning notice securely fixed accordingly.

12 On test, supplementary bonding conductors may be required to ensure integrity of

the equipotential zones, the installation of which shall be agreed with the Engineer. 13 Special regard shall be made, where earthing of instrumentation, transducers and

transmitters is concerned, so that all installations are earthed to the Manufacturer's instructions.

14 Lightning protection units for shall be provided for outdoor instruments. A separate

earth to that of the panel and associated equipment shall be provided for the lightning protection units or suppressors as suitable.



Add the new Part 25 as follows: PART 25 LIGHTING 25.1 GENERAL REQUIREMENTS

1 The works under this section shall comprise the providing, fixing, wiring, suitably

supporting and connection of the whole of the lighting installation including all luminaires, lamps, outlet boxes, fixings, light switches, switch boxes, wiring, plug-in ceiling roses, etc., and all other items that may be required to complete the installation as indicated on the drawings and as detailed within this specification.

2 Luminaires shall be of the type and manufacture as detailed on the drawing. All

luminaires shall be supplied complete with the correct size and type of lamps and incorporate high frequency ballasts where applicable. All other luminaires shall be fitted with Polylux high efficiency, triphosphor, T5 high efficiency lamps.

3 The Contractor shall be responsible for the correct ordering of all luminaires. 4 Wiring for the lighting installation shall be PVC cables installed within conduits.

Where ever possible all conduits shall be cast in to slab or chased in to the block walls for a neat finish.

5 Luminaires shall incorporate the relevant high frequency regulating ballasts with all

such equipment being fitted by the luminaire Manufacturer. 6 Quick start fluorescent light fixture of 1500mm length shall be provided with

adequate service illumination for MCC room/control room and storage rooms. The lighting level shall be designed for 500 lux.

7 Bayonet type lampholders complete with lamp shall comply with BS EN 61184.

Wherever practical low energy lamps complete with non-flickering quick type starters shall be adopted throughout the Works.

8 Fluorescent lampholders complete with lamp/lamps and control gear shall comply

with BS 5042/BS 5101. 9 Where practical lights shall be controlled from a switch mounted adjacent to each of

the access doors or shall be door operated. 10 Plant room lights to be weatherproof and accessible for maintenance. Light fittings

shall be complete with lamps, suitable brackets, and control gear where required. 25.2 EMERGENCY LIGHTING 25.2.1 General Requirements 1 The Works to be executed by the Contractor under this section shall comprise the

providing, fixing, wiring and connecting of the whole of the emergency lighting system including all lumanaires, lamps, outlet boxes, key switches, switch boxes, wiring, supports, fixings, etc., as indicated on the drawings and detailed within this specification.



2 The installation of the emergency lighting system shall comply with BS 5266 Part 1: 1988, the General Electrical Specification, the relevant British Standards and this Particular Specification.

3 The Electrical Sub-contractor shall include for the supply and installation of 3 hour

maintained emergency lighting conversion packs as indicated on the drawing. 25.2.2 Final Circuit Wiring 1 The whole of the final sub-circuits shall be carried out using halogen free, low smoke

emitting cables with copper conductors type PVC to BS 6004 and B.A.S.E.C. approval.

2 Minimum cable sizes shall be 2.5 mm2 with the emergency lighting installation being

wired on a loop in principle. 3 Throughout the installation all phase conductors of all single-phase circuits and

conductors shall be coloured RED over their entire length.

All neutral conductors shall be coloured BLACK. 25.2.3 Luminaires

1 Emergency luminaires shall comprise a combination of specific and general mains

luminaires fitted with 3 hour self contained conversion packs and local hold-off relays.

2 Emergency luminaires have been designated as follows on the drawings:-

a. (Em) 3hr Self contained maintained conversion pack and hold-off relay fitted with the general mains luminaires

b. (E1) 3hr Self contained non-maintained external luminaires

c. (E2) 3hr Self contained maintained exit luminaires

3 All conversion modules shall be factory fitted by the emergency lighting system Manufacturer, and the Sub-contractor shall be responsible for liaising with the luminaire Manufacturer to ensure that the luminaires are supplied for conversion in adequate time to comply with the installation programme.

4 All emergency luminaires shall be provided with a permanent supply from the local

lighting circuit.

5 All general mains luminaires fitted with conversion packs shall be identified by means of a RED LED fitted to the body of the luminaire.

25.2.4 Emergency Lighting Test Facility

1 The emergency luminaires shall be tested via a local key operated switch installed

integrally as part of the grid lighting switch within each room which contains an emergency luminaire.



25.3 CERTIFICATION, TESTING AND COMMISSIONING

1 The Contractor shall include for commissioning the emergency lighting system. In addition to the above the Contractor shall complete, sign and handover a Certificate of Test and Inspection as referred to in Appendix A of BS5266: Part 1, 1988.



Add the new Part 26 as follows: PART 26 GENERAL POWER INSTALLATION 26.1 GENERAL REQUIREMENTS

1 The works to be executed by the Contractor under this section shall comprise the

providing, fixing, wiring and connecting of the whole small power installation including all socket outlets, spur units, double pole switches, cables, back boxes etc., and all other items required to complete the installation as indicated on the drawings and as detailed within this Specification.

2 The whole of the final sub-circuit power and ancillary power installations shall be

carried out using halogen free, low smoke emitting cables with copper conductors type PVC to BS 6004 and B.A.S.E.C. approval.

26.2 SOCKET OUTLET INSTALLATION

1 All socket outlets shall be the 13A switch type to BS 1363. 2 All socket outlet circuits shall be wired as ring circuits. 3 Where it is reasonably expected that socket outlets shall supply IT equipment/

instrumentation, these sockets shall be single sockets to meet the requirements of regulation 607 of BS7671 for sockets supplying IT equipment. Note: The circuit protective conductors of each ring circuit shall be separately clamped in the earthing terminal block of the relevant distribution board to meet the requirements of Regulation 607.

26.3 CONNECTION UNITS 1 The Sub-contractor shall allow for providing, installing and fixing fused connection

units in the positions indicated for items of fixed equipment. 2 Connection units supplying extraction fans shall be connected as part of the local

ring circuit. Connection units supplying air conditioning split units, water heaters etc shall be

connected as star circuit. 3 All connection units shall be fused DP switched type, unless indicated otherwise and

shall match the socket outlet installation. 4 Connection units shall be fitted with the appropriate size fuse for the equipment they

are supplying as recommended by the supplier of the equipment.



Add the new Part 27 as follows: 27 COMMUNICATION EQUIPMENT 27.1 GENERAL REQUIREMENTS

1 The works to be executed by the Contractor under this section shall comprise the

supply and installation of containment systems for Telephone and Data Installations. 2 The Contractor shall be responsible for including the installation of all cable

containment and management systems, and the provision of all other equipment and items required to complete the installations as outlined on the drawings and specification and in full compliance with the appropriate Qatar telecom standards and guidelines.

27.2 VOICE AND DATA INSTALLATION

1 The Contractor shall provide 2 No RJ45 outlet at each voice outlet shown on the

drawing. 2 The Sub-Contractor shall provide a network of suitably sized galvanised trunking

and PVC conduits between the distribution board and outlets for voice/data as shown on the drawings.

3 The trunking and conduits shall be provided with a PVC draw-in wire (1kN) for ease

of installation for future circuits 4 The wiring to the voice and data outlets points shall be carried out by Qatar telecom

during the course of the contract period. The Contractor shall be responsible for liaison and arranging the installation with Qatar Telecom to ensure a complete installation.

27.3 TELEPHONE DUCT

1 A 100 dia PVC duct with necessary manholes to Qatar Telecom requirements shall be laid from the control room to the site boundary in coordination with Qatar Telecom for bringing telecommunication to the site.



Add the new Part 28 as follow: PART 28 DE-SILTING EQUIPMENT 28.1 GENERAL

1 Provide vacuum recovery system comprising of 1 air powered pump, 1 silencer, 1

vacuum recovery tank, 1 Density Controller and all Camloc connectors and hoses as required supplied for compact assembly to remove grit and silt with unlimited moisture contents to be transported over 20m vertical and up to 40m horizontal distance to the following requirements.

2 The system shall be designed for removal of sludge, solids, abrasive materials and

concentrated slurries from underground tanks, sumps, culverts, etc. 3 The vacuum pump shall be powered by a 600CFM compressor (not in the scope of

supply) and use this energy to entrain the material to be vacuumed. 4 The pump shall have no moving parts, be simple in operation to be used by

unskilled labour. The pump shall be lightweight no more than 30kg and of small physical dimensions width no more than 30cm and suitable to be handled by one man in a confined space.

28.2 OPERATING PRINCIPLE 1 The pump forms the basis of a highly efficient materials handling system. The pump

takes a high energy stream in this case compressed air derived from a compressor and uses this to entrain the material to be vacuumed. The vacuum recovery system combines the standard pump, operating on compressed air, with a vacuum collection tank, designed to act as a separator which stores material for controlled discharge into a hopper. In this mode, the pump develops a continues vacuum up to 26 mercury (66cm Hg) together with high induced air flow. The system is to be used with a 600CFM compressor at 150PSI.

28.3 CONSTRUCTION 1 Casing shall be 316 stainless steel material complete with 50 mm branch inlet, 600

cfm air nozzle, air nozzle adaptor, Ni-Hard Cast 44mm mixer, Cast 102mm diffuser and vacuum connector.

2 Suction nozzle shall consist of a 4 density controller (gulper) and connector

compatible with the vacuum hose. 3 All connections shall be flanged to the standard compatible with external hoses to be

also supplied with the pump. 4 Hoses shall be heavy duty construction with necessary connectors wire whipped for

connection from pump to the vacuum tank. 50 mm dia compressed air hose shall be 300 psi rated.



28.4 ACCESSORIES 1 Provide 0.254m capacity vacuum tank, complete with counter balance door, tank

support and vacuum hose connections. 2 Provide pump silencer with connection 4 Table D to the pump body.

3 Provide compressed air and vacuum hoses with necessary connections as

recommended by the system manufacturer for required duty. 28.4.1 PAINTING 1 Painting shall be as per Qatar Construction Specification Section 8, Clause 8.

28.5 SPARE PARTS 1 Provide spare parts for 2 years operation as recommended by the system

manufacturer.

28.7 POLYURETHANE PIPES AND FITTINGS Material Polyurethane Jointing Flanged, grooved end clamp Lining None Coating None Pressure rating PN 10 Minimum wall thickness 10mm Hardness to ASTM D676-59T 75D Tensile strength ASTM D412-61T 9000 Elongation at break ASTM D412-61T 270% Abrasion index, NBS%, ASTM D1630 435

END OF SECTION

Section C (part2) - Section9 - M&E Equipment.pdf

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