Mechanical Specs for Pool

Y Tower – Reem Island, Abu Dhabi Volume III – Mechanical Specification Plot C20 – C21�

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Apr 2016 Project No: 25002 Page 33 of 222

2.7 Hot Water System

All network pipe material shall be PPR type.

All pipe within Pump room shall be copper.

2.7.1 General

Under this section of the specification, the contractor shall supply and install a complete hot water system, generally as shown on the drawings. The system shall include, but not be limited to the following:

2.7.2 Electric Water Heater/Horizontal Type (where applicable)

Heater Type: cylindrical glass type storage type, comprising inner tank, outer jacket, immersion type electric heating elements, thermostat, electric control box, pressure and temperature relief valve, water connections and sturdy floor mounting legs or wall brackets suitable for the type of heater used. It is to have a magnesium anode rod to protect against electrolytic corrosion. Inner Tank: heavy gauge submerged-arc electric welded steel, designed for a working pressure of 10 bars and hydrostatically tested to 20bars at the factory and to be glass lined. Inner Tank: to have stainless steel cold water dip tube to carry incoming cold water to tank bottom, and anti-siphoning opening at top. Tank to have 20mm drain connection with 20mm drain valve at bottom, 20mm relief valve connection at top insulated complete with piped connection to nearest drain outlet and water inlet and outlet connections. Outer Jacket: heavy gauge steel, rust proofed with two coats of anti-rust paint inside and outside and smoothly finished with durable baked-on high gloss enamel. Space between tank and jacket to be filled with blanket type glass fibber insulation of adequate thickness. Combination Temperature and Pressure Relief Valve size 20mm to be fitted at the factory. Relief valve to be self-closing, lever-operated type, with thermo-bulb expansion, factory set at 125 psig and 99 °C, and directly immersed in the water.

Heating Elements: to be immersion type at least two in number, fitted into tank with forged steel adapters. Elements to be removable without draining the tank. Each element to have separate contactor and high limit temperature control. Elements to be controlled by one adjustable immersion type thermostat with a range of adjustment not less than 32 to 87.8 ° C. Electric Control Box : to be mounted on the heater at factory. It is to contain the contractors, thermostat, necessary transformer and junction block, and is to be fully wired and tested at the factory ready for installation with simple connection to the power supply.

Isolating valves, non-return valve and flexible connections to be used for Electric water heater installation.

Relief valve will be installed on the cold water line shall take a pressure of 8 bars.

2.9 Swimming Pool, Jacuzzi, Steam Room And Sauna (Infrastructure)

2.9.1 General

This section cover infrastructure connection of drainage and make-up cold water shall be provided to all pools, Jacuzzi, Steam rooms and Saunas connections shall include pipework, fittings and necessary valves. There shall


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be a chiller water pipe connection provided for swimming pool cooling if required.

2.9.2 Swimming Pool Specialist Equipment

Swimming pool specialist equipment recirculation pumps, filteration system, chemical dosing and heat exchanger (if required) by the specialist contractor and shall be covered in this scope.

2.10 Identification

All valves, plant and equipment installed shall be suitably identified. The identification system shall be agreed in detail with the Engineer, but shall broadly meet the following requirements:

A. Valves

Identification shall be provided on the valves by means of laminated plastic labels securely attached to each valve. The label shall be engraved with a number indicating the service and the area isolated or regulated by that valve. Each valve number shall be noted on the record drawings and record valve chart.

B. Plant and Equipment

Each item of plant and equipment (e.g. pumps, water heaters, etc), shall be provided with an identification plate giving complete identification of the equipment in English and Arabic.

2.11 Final Tests and Commissioning

The Contractor shall start-up and operate the whole installation for a period of not less than 48 hours, during which time all valves, pumps, heaters, fixtures, etc., shall be operated as would occur in the normal operation of the installation for the full period of this test. At the conclusion, the whole of the system shall operate to full satisfaction of the Engineer. Testing generally shall be in accordance with BSCP 310:1965.

2.11.1 GRP tank testing

All the tanks operating at atmospheric pressure shall be tested under “tank full” condition for tightness and structural soundness.

After installation tanks shall be filled with water and subjected to standing water test for 48hours.

Carefully examined all the joints.

No leakage shall be observed.

On completion of leak test, the tanks shall be flushed out twice using maximum water pressure available and all extraneous matter removed including water during the operation.

2.11.2 Pipework Pressure Testing

All pipework services shall be subjected to a test of 1000 KN/m or one and a half times working 2 pressure whichever is the greater, for not less than 12


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Apr 2016 Project No: 25002 5 of 222

hours.

Where pipework is tested in sections, all valves shall be blanked off temporarily using plugs or blank flanges. The valve wedge shall not be used to retain the water. The pipework services shall be charged with water allowing all air to escape and avoiding shock or water hammer. The test pressure gauge shall be mounted within the pipework system with a loop and cock and shall be calibrated such that the test pressure falls above its mid-range.

The Contractor shall carry out his own test first to ensure there are no leaks prior to requesting the Engineer to witness the test. The witnessed test shall be maintained for a minimum of one hour without measurable loss and without further pumping.

Pipework main laid in ground shall be tested for 24 hours and leakage shall be measured by the quantity of water pumped into the main under test. Leakage shall not exceed five litres per 25mm of pipe diameter per 1750 metre length of pipe for 33 metres head pressure in a period of 24 hours.

The Engineer shall witness all pipework tests. The Contractor shall give the Engineer a minimum of 24 hours notice of all tests. The contractor shall also provide test sheets set out in an agreed manner for each pipework section to be tested.

2.11.3 Proving Tests

Prior to fixing on site, all cisterns and storage tanks shall be re-tested for water tightness ensuring damaged equipment is not installed.

Each water service shall be cleaned down and thoroughly flushed out to remove all dirt within the pipework system.

After the particular water service has been flushed out, refilled and pressure tested, each tap and draw-off fitting shall be checked for satisfactory rate of flow. Particular attention shall be given to groups of sanitary fittings to ensure satisfactory flow with a number of taps open, also that is not drawn into any of the remaining taps or fittings when opened.

2.11.4 Sterilisation of Water Services

All pipework, fittings and storage tanks shall be sterilized starting with the external water supplies storage tanks and finally the water distribution system.

No sterilisation shall be carried out until the system has been flushed out and approval received in writing from the Engineer to commence sterilisation.

The following procedure shall be adopted for sterilisation of the water distribution systems:

Flush out all tanks, pipework, etc

Recharge all water systems adding sufficient sterilisation chemical at the roof tank of a concentration shall be confirmed by using a measuring instrument approved by the Water Department.

Starting with the draw-off point nearest the cold water storage tank, each draw-off point shall be opened until chlorine odor is present at each draw-off.


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When all draw-off points have discharged chlorinated water, the cold water storage tanks shall be recharged adding sufficient sterilisation chemical to give the correct concentration of 1-2 parts per million of chlorine. The system shall then remain charged for a minimum period of one hour.

The water shall then be chemically analysed.

-End of Section-


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Section 20 – DRAINAGE WORKS FOR BUILDINGS

3.1 General

3.1.1 General specification

This section covers the supply, installation testing and commissioning of sewage, storm water drainage systems and includes internal and external drainage systems in accordance with this specification and the requirements of section 20 of the QCS and shall be installed to BS 8301 and BS 12056

3.1.2 Scope of Works

The scope of works consists of furnishing, installing, commissioning and testing the complete sewage, waste and storm water drainage systems along with all associated manholes, kerbs and duct drains and soakaways as indicated on the Contract Drawings.

The Contractor shall provide all supervision, labour, materials, equipment, machinery and any other items necessary to complete the systems in all respects.

• The drainage system shall include the following:

• Above and underground UPVC soil, waste, vent cowls with insect screen all as shown on the drawing and as specified elsewhere.

• Stainless steel floor drains covers, S.S clean out covers, floor gullies, gully traps, shower drain with Trap.

• S.S cover, overflows, bottle traps, as shown on drawing and specified elsewhere.

• UPVC rain water pipes complete with rainwater outlets as shown on drawings.

• Extra strength vertified clay pipes between manholes as shown on drawings.

• Rain water soakaways with heavy duty ductile manholes covers shall be provided by Infrastructure contractor.

• Drain pipes connections for Jacuzzi and swimming pool mechanical rooms.

• UPVC condensate drain pipes for fan coil units, air handling units etc.

• accoustic lagging of all drainage pipes to prevent any flow noices

• Other works and materials to make the system complete and functional.

3.1.3 Storage and Handling

Storing and handling including taking delivery, loading and unloading of pipes, valves, fittings and other equipment shall be carried out by the Contractor in such a manner as to avoid breakage, distortion, denting or other damage. Stacking of materials shall be done in such a manner as to prevent to the pipe or coatings to the satisfaction of the Engineer.


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Plastic pipes and fittings shall be stored under cover and out of direct sunlight at all times. Pipes shall be supported throughout their entire length and free flow of air around them maintained. Generally, all pipes shall be handled using canvas slings not less than 250mm wide. The use of chains or wire slings will not be permitted.

All valves and fittings shall be stored under cover on hard standing until required for fixing. Uncrated valves and fittings shall not be stacked.

Pipes and fittings damaged during handling or storage shall be set aside and the Engineer informed. If in the Engineer’s opinion the damage is such that the pipe or fitting has been permanently impaired it shall be removed from site.

No repairs shall be started without the approval of the Engineer.

3.1.4 Transport and Stacking of Pipes on Site

The Contractor shall take every care to ensure that no damage whatsoever results to the pipe from transport and stacking. All truck s, wagons, stacking methods and devices shall have the approval of the Engineer but his approval shall in no way relieve the Contractor of his responsibilities under the Contract.

Pipe shall not be allowed to drop or strike objects which may damage the pipe, but shall be lifted or lowered by suitable approved equipment. Hoister and buildings of approved type shall be used on all vehicles used for the transport of pipe.

The Contractor shall ensure that all pipes with special or of different diameter, wall thickness and manufacture are stacked separately. Successive tiers of spigot and socket pipes shall have sockets protruding at opposite ends of the stack.

All pipes shall be stacked on flat level ground and in such a manner as to prevent damage to the pipework or coating. Pipes shall not be placed on the ground but raised on timbers with bedding of straw bags or similar approved by the Engineer. The timber shall in no case be less than 200mm wide and 75mm thick.

Pipes shall be stacked in accordance with manufacturer’s recommendations but not to a greater height than 4 tiers.

Approved bedding shall also be placed between each tier of pipes.

3.1.5 Inspections

Written notice on prescribed form shall be given for the purpose of inspection, measurement and testing for each of the following cases:-

• Setting out completed

• Excavation complete

• Beddings laid

• Drainage laid and ready for testing

• Drainage bedding cover complete and compacted


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Backfilling complete and compacted with ground level finish complete ready for final testing

3.2 Pipes and Fittings - Materials

3.2.1 General

All UPVC pipes and fittings shall be manufactured under a BS 5750 Quality system and shall comprise the whole range of integrated system of same manufacturer allowing the easy plumbing of an installation.

Drainage pipes passing through occupied areas and or exposed areas shall be acoustically lagged by a proper and approved way by Engineer to prevent and isolate the sound. these pipes shall be sound isolated

The system shall comply with appropriate British Standards and where applicable, bear the Kitemark.

All risers and pipes shall be acoustically lagged and perfectly isolated to prevent any sound and noice

3.2.2 Soil, Waste and Overflow Systems

Reference should be made to the following Codes and Standards:

BS 274-1 Waste fittings for sanitary appliances

BS 4514 Unplasticised PVC soil and ventilating pipe fittings and accessories

BS 1451-1 Plastic piping systems for soil and waste discharge within building structure.

BS 5255 Plastic waste pipe and fittings.

BS 12056 Gravity drainage systems inside buildings

CP312: Part 1 & 2 Plastic pipework (Thermoplastic material)

Materials and Colour: pipes and fittings shall be UPVC, in grey or rustic brown.

Socketed fittings shall be solvent-welded with plain ended pipes. Seal ring expansion joints shall be provided where required.

The system shall be compatible with buried drain system. Weathering Apron (solvent-weld socket) shall be solvent-welded to the soil, waste, vent pipes for weather flashing around pipe at roof.

Seal ring socket type PVC caulking bush shall be used to connect PVC pipes to sockets of other material if applicable.

Adjustable, plastic coated steel holder bats shall be used to support pipes or secure fittings. Galvanised mild steel support bracket with packing piece shall be used for horizontal pipes. Smaller pipes and fittings shall be secured to wall by zinc-plated steel brackets.

Floor gully covers and cleanout covers shall be in UPVC with stainless steel covers.


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UPVC Buried Drain System

The UPVC pipes and fittings shall comply with BS 4660 and BS 1401, comprising complete drainage system, compatible to soil waste and rainwater system and where appropriate shall bear the Kitemark.

Materials and Colours: buried drain system pipes and fittings shall be UPVC with polypropylene seal retaining caps. Underground fittings shall be coloured golden brown, approximately to BS 381 C: number 414. Seal retaining caps and seal rings are black. Rodding eyes shall be provided where required.

UPVC solvent weld socket seal/lip and lip seal/lip seal shall be used.

The contractor should take into consideration to have acoustically isolated horizontal and vertical pipes in a proper way to prevent any such noises and by any mean of accoustic isolation and approved by engineer

Where necessary, lip seal/lip seal slip couplings shall be used.

Transition from higher dia. to lower one shall be made by using level invert taper. Special adaptors and caulking bush shall be used to join UPVC channels in manhole connections to drainage system.

UPVC Puddle flanges shall be provided where pipework passes through the walls or roofs or structural slabs.

3.2.3 Solvent Cements

Solvent cements should comply with either BS 6209 for non-pressure pipework or BS 4346: Part 3 for pressure pipework.

3.2.4 Sealing Rings

Sealing rings should be made from natural or synthetic rubber complying with BS681.

3.3 Pipes and Fittings – Workmanship

All drainage pipes shall be insulated with 50 mm fibre glass insulation of 48 kg/m3 density.

3.3.1 Pipe Supports, Brackets and Hangers

All pipework shall be adequately supported in such a manner as to permit free movement due to expansion contraction, vibration or other changes in the system. Supports shall be arranged as near as possible to joints and changes in direction. Spacing of supports shall sanitary pipework.

Vertical stacks shall be adequately supported at the base to stand the total weight of the riser. Under no circumstances shall branches from vertical rising pipes be the means of support for the vertical pipework.

High temperature PVC waste pipework 32mm, 40mm and 50mm shall be supported using stand off two piece clips screwed to the wall using round head zinc plated wood screws. Pipe clips shall be plastic coated galvanised mild steel where exposed to view and galvanised mild steel where concealed.

UPVC soil and ventilation pipework 82mm, 110mm and 150mm shall be


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supported using two piece holderbats screwed to the wall using round head zinc plated wood screws.

Brackets shall be galvanised steel and be rigid. Where soil and ventilation pipes are suspended from the underside of slab, they shall be held rigid in position. Single angle iron supports may be used for pipework up to 500mm from underside of slab. Double angle iron supports shall be used for pipework 500mm-1000mm from the underside of the slab. All supports shall be proprietary brand and manufactured from galvanised steel. Double angle iron braces shall be installed on the both single and double angle iron supports at 6 metre centres for vertical and horizontal runs of pipework and anchored as necessary.

3.3.2 Rodding Eyes

Rodding and cleaning eyes shall be provided as indicated on the contract drawings and as required. Covers for rodding eyes in corridors to be from the same tiles of the corridors.

3.3.3 Roof Termination

All soil ventilation pipes shall terminate 300mm above the point of exit from the services duct.

3.3.4 Jointing

Joints of UPVC and high temperature PVC shall be “O” ring and solvent welded. Prior to jointing, all pipework, fittings and accessories shall be thoroughly cleaned. Pipework shall be cut square, end chamfered and swarf and dust removed. Prior to jointing, pipes and fitting should be checked for correct position and alignment and marked to ensure accurate assembly.

Where “O” ring joints are to be used pipes shall be marked for insertion depth, “O” ring placed in ring seal prior to application of small quantity of lubricant or petroleum jelly around the chamfered spigot end. The pipe shall then be inserted into the sock et joint and finally adjusted to the correct insertion depth.

Where solvent joints are to be used, special care shall be taken to ensure both spigot and socket are free from all dirt, grease and swarf. Solvent cement shall then be applied liberally and evenly to both socket and spigot prior to inserting spigot into socket. The joint shall immediately be cleaned for surplus solvent with a dry cloth around newly formed joint.

Joint UPVC to cast iron shall be by means of cast iron caulking bush with sealed ring joint for expansion. This fitting shall have rubber seal ring for connecting to PVC and spigot for connecting to cast iron.

Jointing of W.C. outlet to UPVC pipework shall be by means of either a straight or bent connector as required complete with rubber seal ring and suitable connection for W.C. spigot outlet.

3.3.5 Laying Plastic Pipe

All operations involving the laying, bedding, jointing, backfilling etc. of pipes plastic materials shall be strictly in accordance with the manufacturer’s recommendations subject to the approval of the Engineer.

3.3.6 Marker Tape


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Marker tape shall be laid 150mm above all sewerage and effluent pressure pipelines. The marker tape shall be red, non-biodegradable plastic and inscribed with the words “DANGER-NON POTABLE WATER”, in both English and Arabic and shall be of a type approved by the Engineer. Where specified in the Contract Documents blue marker tape as above shall be laid above potable water mains and inscribed with the words ‘WATER MAIN” in both English and Arabic.

3.3.7 Setting Out and Pipe Alignment

All pipes and pipelines shall be laid to the lines and depths shown on the drawings or as otherwise directed by the Engineer.

All pipelines shall be laid accurately to line and gradient so that, except where otherwise specified, the finished pipeline is in a straight line in both horizontal and vertical planes. Where shown on the drawings or otherwise permitted by the Engineer shallow changes of direction shall be achieved by deflection at joints within the maximum permitted by the manufacturer. Where the angle of the bend required is greater than that obtainable by joint deflection then manufactured bends of the appropriate degree shall be used. Manufactured bends shall only be used where shown on the drawings or where otherwise permitted by the Engineer.

All pipelines forming part of a drainage system shall be laid to the specified lines and levels so that every pipeline lies in a straight line in both horizontal and vertical planes between successive manholes on the line. No bends will be permitted other than at manholes.

Every pipe shall be placed in position individually and shall be set out accurately to the line and level required. All setting out to line and level of both pipelines and individual pipes shall be achieved by methods approved by the Engineer.

Where pipelines of constant gradient are to be laid, the Contractor shall provide, fix and maintain at such points as may be directed by the Engineer properly painted sight rails and boning rods of pre-determined measurements for the boning in of individual pipes to correct alignment. The sight rails shall be situated vertically over the line of pipes or immediately adjacent to and there shall at no time be less than three sight rails in position on each length of pipeline under construction to any one gradient.

If the Contractor wishes to propose an alternative method of controlling pipeline alignment, he shall submit his proposed method to the Engineer for approval.

3.3.8 Concrete Protection to Pipelines

All underground drainage pipework shall be surrounded with 150mm thick Grade SRC 20 sulphate resisting concrete, along its entire length, in the following locations:

1. All drainage below buildings or structural elements.

2. All drainage with less than 600mm cover


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3. Drainage with a cover of between 600mm and 1200mm, where there is vehicular traffic over the ground above the drain line.

4. Elsewhere as indicated on the Contract Drawings.

The required depths of concrete bed and height of concrete backfill shall be as indicated on the Contract Drawings.

Where a concrete bed and surround is specified, a minimum of 75mm binding of concrete Grade 25 shall first be laid over the full width of the trench.

The pipes shall be laid, jointed and supported on precast concrete blocks which shall be separated from the barrel by 25mm thick timber packing.

After the pipeline has been tested and approved by the Engineer the top of the concrete bed shall be thoroughly cleaned and additional concrete Grade SRC 20 carefully placed and compacted under and around the pipe to a height of at least 150mm above the crown of the pipe.

Where pipes with flexible joints are to be surrounded, 13mm thick fiberboard or polystyrene sheets shall be fixed at the pipe coupling joint extending for the full cross section of the remaining concrete bed and surround and accurately cut to fit the profile of the pipe.

3.3.9 Granular Bedding Material for Rigid Pipes

Granular bedding material for rigid pipes shall consist of gravel or broken stone and shall be suitable “all in” ballast or stone.

For pipes up to 1200 millimetres nominal bore the material shall be graded 12 millimetres to 5 millimetres all passing 12 millimetres and not more than 20 percent passing 5 percent millimetres B.S. sieve.

The minimum thickness of granular material below the barrel of the pipe shall be as follows:

150 millimeters for pipes up to 600 millimetres nominal bore.

200 millimetres for pipes ov er 600 millimetres nominal bore and up to 1200millimetres nominal bore.

300 millimetres for pipes ov er 1200 millimetres nominal bore.

In rock or mixed soils containing rock, boulders, large flints or stones or other irregular hard sports the thickness of granular fill shall increase by 100 millimetres.

3.3.10 Granular Bedding for Plastic Pipes

Granular bedding material for flexible pipes shall consist of coarse graded sand up to 10mm and shall not contain particles with sharp edges which could cause damage to the pipes. The minimum thickness of sand around the barrel of the pipes shall be 100mm.

3.3.11 Backfilling Excavation

After compaction of the granular bed and surround or completion of concrete


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surround, the trench shall be backfilled using selected excavated material free from all rocks, large hard on objects and builders debris of greater than 40mm. Backfilling shall take place immediately after the specified operations preceding it has been completed and shall be layers of 150mm, each fully compacted over the full width of the trench. Power rammers and vibrators shall be used to compact backfilling when the cover over the crown of the pipe exceeds 0.5 metres.

3.3.12 Above Ground Sanitary Drainage Installation

Pipe Sleeves

Pipework sleeves shall be compatible with the pipes they protect and non-combustible.

The inside diameter of sleeves shall be such as to allow an 8 mm minimum gap between the finished surface of an insulated pipe and the internal surface of the sleeve. The length of the sleeve shall be limited to prevent the sleeve protruding beyond the finished building surface. Void between pipe and pipe sleeve shall be packed with mineral wool and sealed at both ends with approved mastic sealant.

Floor, Ceiling And Wall Cover Plates

Floor, ceiling and wall plates shall be plastic and selected to suit the pipework size and material with which they are to be used.

Floor Trap (FT)

The floor drain type FT shall be stainless steel floor gully with 110 mm dia., both bottom outlet and UPVC-P-trap, top socket, three side inlet sockets.

Each side inlet socket shall be 50 mm dia. Blanked off and must be cut out of inlet used.

Floor drain cover shall be 150x150 mm stainless steel screw down slotted grating.

Coated cast iron body with bottom outlet, combination invertible membrane champ and adjustable collar with seepage slots. Outlet size to suit connected pipework. 150 x 150 mm polished, nick el bronze, adjustable level grating.

Solid hinge cover shall be provided where required by Engineer.

Balcony Drains (BD)

Cast iron body with bronze flashing clamp and bronze top secured with brass screws with bottom or side outlet. Outlet size to suit connected pipework.

Grating with mesh screen secured in place by bolts.

All balconies shall be provided with at least one balcony drain.

Roof Drains (SWO)


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Coated cast iron body with bottom outlet, combination invertible membrane clamp and adjustable collar. Outlet size to suit connected pipework.

Domed, cast iron, 300 mm diameter grating with securing bolts.

Roof Scupper Drain (If Required)

Dura- coated cast iron body with plain bronze grate with integral membrane clamp and horizontal outlet.

Cleanouts

Cleanouts shall be installed to provide access to waste and soil pipes for inspection or cleaning, all cleanouts types shall be CI body with stainless steel grade 316 cover.

Cleanouts shall be provided as shown in the drawings, at or near the foot of every vertical stack and no long horizontal pipe runs at every 15 m intervals.

Cleanouts on horizontal pipes (not buried) shall be UPVC access cap fitted with screw cap and washer complete with PTFE tape to seal thread.

Cleanouts on horizontal and vertical pipes (not fitted to the fittings), shall be made by access pipe with 75 mm dia. Opening for access and sealed with screwed cover.

All fittings used for the connection between horizontal pipe and vertical pipe (not buried) shall be fitted with access doors secured by two SS-316 and captive nuts.

Wall Type Cleanouts (If Required)

Coated cast iron body with gas and water light ABS tapered thread plug, and nickel bronze secured square, smooth wall access cover and frame.

Outlet size to suit connected pipe work with dia. 100 mm.

Kitchen Drain Channels (If Required)

Stainless steel grade 316. 300 mm wide channel with integral slope & trap, 200 mm min. depth, load class A electro polished anti-slip mesh grating and trapped gully outlet.

Grease Traps

The Construction of grease traps shall be in accordance with British Standard BS 8007. All cement shall be Sulphate resisting and comply with British Standard BS 4027. All reinforced concrete base slab walls and cover slab shall be cased in situ using grade 25 concrete and comply with British Standard BS 8110.

Traps shall be constructed to take into account the ground conditions, strictly in accordance with the structural Engineer’s details.

Each grease trap shall be painted internally and externally with one coat of bituminous emulsion and two coats of bituminous paint. Two 900 mm x 900 mm access manholes shall be provided, one for each chamber, with heavy duty manhole covers as detailed in the schedule of manholes. The grease


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trap inlet and outlet shall be cast iron and have a puddle flange located within the wall.

A scum board shall be located in the first chamber as detailed on the drawings and a v ent shall be provided from the second chamber with internal vent connection between the two chambers.

Traps

All traps in wash basins, sinks and floor drain, etc. shall have 75 mm water seal. All traps shall have the same bore throughout the trap, connection to the buildings fixed drain shall be v ia an “O” fittings.

Roof Vent Cowl

Roof vent cowl shall be provided for all vent pipes as shown on the drawings.

Roof vent cowl shall be UPVC with screened cap and connected to the vent pipe by solvent welding.

Water Hammer Arrestors

Water hammer arrestors shall be fitted as shown or as required. Water hammer arrestors shall be type ‘K’ copper with brass threaded adapter. Opening shall be equal to the pipe diameter at the point of connection.

Installation

All floor drains and floor cleanouts shall be installed square to the building and surrounding finishes. The Contractor shall ensure that floor drains are co-ordinated with the tiling layout.

3.4 Manholes

3.4.1 General

The Contractor shall provide manholes at the locations and to the sizes shown on the drawings. Manholes shall be constructed in accordance with the detailed drawings and as described in this specification. However, the final location of the manhole at site shall be coordinated with Landscape Architect.

Manhole chambers shall be constructed in Sulphate resisting concrete blocks of minimum strength 3.5 n/mm sq. laid in bond and joined with a 3:1 sand and Sulphate resistant cement mortar and set on a 150 mm thick concrete base.

The block courses shall be laid even and uniform and broken blocks are not to be used except for snap headers. Block cavities shall be filled with concrete and finished smooth with face rendering.

3.4.2 Concrete Manholes

The pre-cast concrete manhole units shall be constructed in accordance with B.S. 556 and QCS 2007. The manholes shall be provided in accordance with the drawings to the invert and size shown. The Sulphate resisting cement where required shall be of approved manufacture and shall comply with B.S. 4027.


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On manholes over 1 M deep galvanised step irons shall be built into the block wall as work proceeds at 300 mm horizontal and 225 mm vertical centres down to within 225 mm of the benching.

An insitu concrete cover shall be constructed over the block chamber to the size and thickness shown on the drawings with a clear opening to suit type of cover specified. The opening being located to afford direct access onto the deep irons

Half channels with three quarter section bends shall be laid in the bottom of the manhole with flexible joints on the drains immediately outside the manhole wall.

Concrete benching shall be formed to a fall of not less than 1 in 5 to the channel and finished smooth with 12 mm thick 2 : 1 sand and cement mortar trowelled with all angles rounded.

All manholes constructed shall be tested for water tightness by filling with water before backfilling of the excavations is completed. After a reasonable period has elapsed, the water level shall be made good by adding further water as required. This water level shall be maintained for half an hour without adding further water.

External faces of structures shall be kept clear for inspection until they have been approved by the Engineer.

Concrete for reinforced concrete manhole slabs shall be 1 : 11/2 : 3 mix. Aggregates shall conform to B.S. 882. The strength of reinforced concrete shall be 21 mN/m sq. at 28 days.

Reinforcing bars shall be 12mm diameter, high tensile, or 16 mm mild steel fixed at 100 mm centres with 25 mm cover from the underside of slab. The minimum thickness of slabs shall be 150 mm.

3.4.3 Manhole Covers

All manhole covers shall comply with BS124 of the sizes and types indicated on the drawing. The internal manhole covers shall be of Heavy duty with double seal. The manholes located in the paved and road areas shall be heavy duty.

3.4.3.1 Medium Duty

All manholes installed external to buildings, but not in roadways or trafficked areas, shall be medium duty to BS 124 Grade B1.

The cover and frame shall be of ductile iron and the cover shall be either rectangular or circular as specified in the Manhole Schedule. Such manholes shall incorporate a single seal between cover and frame. Following flushing out and testing of the drainage system, the sealing groove shall be filled with grease to provide an airtight seal.

3.4.4 Precast Manhole Rings (if provided)

These shall be of lightly reinforced Type 1 cement concrete class C 300. Rings shall be of one meter internal diameter, 15 cm (6 inch) thick and suitable


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lengths. They shall be boxed on the manhole shaft and jointed with cement and sand mortar (1:3) and the external walls shall be treated with three coats of liquid asphalt to a thickness of not less than 2 mm.

3.4.5 Cast Iron Accessories for Manholes

Manhole covers and frames: Cast iron covers for manholes shall be heavy duty, round, single seal type with closed key holes or medium duty, square, single seal, recessed type with closed key holes. They shall be of sound manufacture and free from projections or voids and shall be treated with two coats of an approved tar compound (Inertol thick L or approved equal). Frames shall be single seal, square type according to the dimensions conforming in general to local manufacturer. The covers shall be fixed on to the previously installed frames after filling the seal grooves with a mixture of grease and sand.

Step irons shall be of galvanised cast iron conforming to BS 1247. The weight of the step iron shall not be less than 3.20 lbs and shall be 10 inch (250 mm) long and 6 inch (150 mm) wide.

Two nos. prising and lifting bar of approved design shall be supplied by the Contractor for the project.

3.4.6 Steelwork

Structural steel shall comply with the requirements of BS 15. Dimensions and properties of beams, bars etc. shall comply with the requirements of BS 4.

Bolts, nuts, etc. shall comply with the requirements of BS 916 or BS 1768 whichever is applicable.

Welding shall be carried out by approved welders in accordance with the requirements of BS 1856 or BS2642, whichever shall be applicable and BS 2645. Electrodes shall fulfill the requirements of BS 639.

Unless otherwise specified, structural steel work shall be rust protected in general conformance with BS 5493 and as follows. After erection all rust and scale and loose paint shall be removed by means of sand blasting or by steel wire brush or other approved means. All surfaces shall immediately thereafter be coated with two coats of bituminous paint, thick Inertol 49 or similar approved product. The coating shall be applied in dry weather. Prior to the second coating, the first coating shall be absolutely dry.

3.4.7 Setting Out and Excavation of Trenches for Below Grade Mains

Trenches shall be excavated only after completion of site development work like backfilling, if any. Care shall be taken to ensure that no heavy equipment shall be worked or moved over piping, which is not designed to take up such loads.

Clear the existing ground levels along the line of all mains, particularly at all manholes, building connections etc.

Where long lengths of piping mains are to be laid in trenches at slight slope, sight rails should be fixed across the trench at intervals of at least 5 meters at a height equal to the length of the boning rod to be used above


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the required invert level of the drain or sewer at the point where the sight rail is fixed. There shall be not less than two sight rails in position on each length of the main under construction.

The trench shall be excavated to the actual required depth such that the pipe shall bear uniformly on undisturbed ground at every point between joint holes.

The Contractor shall examine any unfitting or weak ground material which may be found below the pipe laying level and report the same in writing to the Engineer, before laying any pipe. In such cases, the unsuitable material shall be removed and made up by backfilling, at additional cost to the Employer.

3.4.8 Installation - Particular for Below Grade Mains

Handle pipes with utmost care so as not to subject the pipes to shocks which may crack or break the internal lining, if any. Cement lined pipes which are cut to length on site shall be tapered at their spigot ends by a grinder and a fast drying coal tar coat applied at the uncoated areas.

The pipes shall be laid directly on the undisturbed bottom of the trench with special recesses made for the joints or placed on a concrete bed. The pipes must be aligned carefully both in line and level.

Wooden supports must not be placed under the pipes. Precautions shall be taken to prevent dirt from entering the pipe.

Ductile iron pipes shall be wrapped up with polyethylene sleeving before laying. Adhesive tapes shall be used to secure the sleeving at socket and spigot ends. Plastic coated wire shall be used to secure the encasement at every one third length of the pipe. After jointing is done and testing completed, encasement shall be pulled to close the whole joint and be secured with plastic coated wire strapping.

The pipes shall be laid with the folded part of the polyethylene encasement on the crown of the piping. Piping shall be protected against the ingress of foreign material before the pipe is placed in the trench. If the case is such that the pipe cannot be laid, in the trench and in place, without getting earth into it; each end shall be covered with a heavy, tightly woven canvas bag of suitable size before lowering the pipe into the trench. The bag shall be left there until the connection is to be made to the adjacent pipe.

When jointing pipes, a mark shall be made to check the position of the end of the barrel.

Leave a gap of 5 to 10mm between the ends of the pipes, for piping with flexible joints.

The joints shall be left exposed until the line is pressure tested and approved by the Engineer.

Deviations from given levels may not be greater than + or - 1 cm at any point and gradients not greater than 1/20 of the given value.

3.4.9 Installation of Manhole Accessories

Frame of manhole cover shall not be cast in together with roof slab of


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manhole.

Covers and frames shall be fixed in such a way to match adjacent surface levels with tolerance not exceeding + or -3mm. Before the Defects Liability Period expires, check all manhole covers and readjust them if they are in excess of above mentioned tolerance.

Fix all cast iron accessories to concrete manholes using cement and sand mortar (1:3)

3.4.10 Step Irons

Step irons shall be manufactured from galvanised malleable cast iron and shall comply with BS 1247 and be of the general purpose or precast concrete manhole pattern as applicable.

The tail length shall be 230mm for both manhole types.

3.5 Storm Water System

3.5.1 Pipework and Fittings

Pipework and fittings for storm water system shall be UPVC to B.S. 4514. All pipework, fittings and accessories shall be installed strictly in accordance with manufacture’s recommendations. The Contractor shall ensure that the UPVC used is of a sufficiently high temperature rating to withstand the environmental conditions.

3.5.1.1 Rainwater Outlets

Storm Water outlets shall be of PVC material with mesh, and shall be set in steel structural U channels at roof level, sample shall be provided to the Engineer/Consultant for their approval.

3.5.2 Pipework Installations

During installations of the storm water system, the Contractor shall make due allowance for the expansion of the pipework and fittings during normal working conditions. Further allowance shall be made for solvent weld joining of the above materials with regard to temperature and humidity.

The bores of all pipework shall be smooth and free from all burns or obstructions; bends wherever possible shall be of the long radius types.

All connections between pipes and Rain water outlets shall be made with approved connectors.

All rainwater shall be free discharge at Ground floor level or as indicated on drawings

3.5.3 Protection of Works

The installation shall be adequately protected against damage and deterioration when handed over, the installation shall be in a clean and sound condition. Particular care must be taken during the course of construction to seal all open ends of pipe work, gullies and soakaway with a temporary cover. Wood shavings or paper will not be accepted for this purpose.


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3.5.4 Testing and Commissioning for Drain Pipes

The Contractor shall provide all equipment necessary for testing. Generally, the whole installation shall be tested in accordance with the requirements of AD municipality

Before any test is carried out the Engineer shall be given 24 hours notice. All defects located shall be corrected before further work proceeds and the whole of the section of work affected shall be re-tested.

No section of pipes shall be back-filled before it has been tested.

3.5.5 Test for Storm Water

Testing shall be carried out before any pipes are haunched or surrounded with concrete. All joints shall be ex posed.

Storm water should be tested in section. Short branches connected to main runs shall be tested at the same time.

The length to be tested shall be subjected to a static head pressure of not less than 1.5 M at the highest point of the section being tested. After sufficient length of time has been allowed for, the absorption of water into joints, the section under test shall be ‘topped-up’ and the head maintained without apparent loss for not less than one hour.

3.6 Commissioning And Testing

3.6.1 General

All drain pipes shall be tested in accordance with the requirements of BS 8301

The Engineer shall witness all drainage tests. The Contractor shall give the Engineer a minimum of 24 hours notice of all tests. The Contractor shall also provide test sheets set out in an agreed manner for each drain section to be tested.

The Contractor having ensured that water, electricity and other necessary supplies are available shall set to work the completed work s or part thereof, at the instruction of the Engineer, and make the necessary adjustments to ensure correct functioning.

After the installation or part thereof has been set to work and adjusted, the Contractor shall demonstrate its operation at a time selected by and to the satisfaction of the Engineer. Tests shall be in accordance with British Standards BS 6700.

The test shall demonstrate:

a. That equipment provided complies with the Specification in all particulars and is of adequate capacity for its full rates of duty.

b. That all items of plant and equipment operate quite sufficiently to meet the specified requirements.

c. That all instruments, protection and control devices, etc., are correctly calibrated and accurate.


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d. That all drainage runs satisfy the required water tests.

The details of method of carrying out the recording of tests shall be agreed with the Engineer. The Client’s representative and the Engineer shall be at liberty to be present at tests and to participate in the tests. This shall not relieve the Contractor of his responsibilities f or carrying out the tests satisfactorily.

The Contractor shall make all the records during the tests and on completion thereof shall provide the Engineer with a test report and record, both in triplicate. The Contractor shall also provide all test instruments together with skilled supervision and adequate labour for carrying out the tests.

3.6.2 Proving Tests

All under slab, underground drainage, soil and waste system shall be cleaned down and thoroughly flushed out to remove all dirt within each pipe work system.

After each system has been flushed and each draw off fitting opened and the drainage, soil and waste system shall be checked for satisfactory flow rate. Particular attention shall be given to groups of sanitary fittings to ensure satisfactory flow when a number of fittings are flushed and air not drawn into the system via any trap.

3.6.3 Water Test

All drains shall be tested before backfilling, immediately after the drain has been properly laid on the correct trench bed and after joining materials has had time to set. A water test pressure of 1.3m head above the soffit of the drain shall be applied at the high end, but not more than 2.4m head at the low end.

The test shall be carried out on lengths of drain not less than half the distance between manholes, all to be agreed with the Engineer on site. The lower end of the drain shall be plugged and the higher end shall have a standpipe not less than 1.2m high. The drain shall be filled, taking care to eliminate trapped air.

After repair of leakage due to defective pipes, joints and plugs, the drain under test shall be left for one hour to allow water absorption by pipe and fittings.

The loss of water over a period measuring vessel at intervals of ten minutes and noting the quantity of water required to maintain the original level in the stand pipe. For drains up to 300mm diameter, the water quantity added shall not exceed 0.06 litre per hour per 100 linear metres per millimetre of nominal bore of the drain under test.

All drains shall be tested for a second time as described above after correct bedding cover and selected backfill have been consolidated and the finished surf ace complete.

3.6.4 Air Test

A gauge in the form of a “U” tube shall be connected to the plug fixed at one end of the length to be tested and all junctions and connections to the sewer on drain shall be plugged.


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Air shall then be pumped in from the other end of the drain under test until a pressure equal to 100mm of water is indicated on the gauge. Without further pumping, the pressure shall not fall more than 25mm during a period of five minutes.

Air tests shall be carried out after 3 pm and all pipework shall be shaded from the sun at all times. Should an air test fail, a water test shall be carried out as described in this Specification.

3.6.5 Profile Test

A hardwood ball, of an approved profile, shall be drawn through all foul drains from manhole to manhole and through branch foul drains before soil pipes, gullies and W.C.’s are filled. The diameter of the ball or profile shall differ from the nominal internal diameter of the pipe by not more than 6mm or by not more than 4% of the nominal internal diameter of the pipe, whichever is the greater difference.

During commissioning, all manhole cover shall be removed and water flow tests shall be carried out to ensure that the drains are flowing at their designed capacity and that they are free of debris.

3.6.6 Manhole Test

All manholes shall be tested in accordance with the requirements of BS 8301

The Engineer shall witness all manhole tests. The Contractor shall give the Engineer a minimum of 24 hours notice of all tests. The Contractor shall also provide test sheets set out in an agreed manner for each manhole to be tested.

All concrete manhole cast in situ and precast concrete manholes shall be water tested by plugging all necessary connections and filling the manholes with water to a minimum height of 600mm above the top of the benching. Water shall be added at ten-minute intervals until absorption has ceased. No change of water level shall occur for an uninterrupted period of three hours.

3.7 Spare Parts and Tools

After completion of the Works and during the specified maintenance period the Contractor shall be responsible for the supply and installation at the fixed time recommended by the manufacturers of al spare parts and components, required f or the ideal running of all engineering services installation, all subject to the approval of the engineer.

In addition the contractor shall procure and store the recommended spare parts which needed for proper preventive maintenance program. The contractor shall allow to enlarge this list based upon the recommendations of the equipment suppliers.

3.78 Spare Parts Information & Tools

1. Spare Parts information: The Contractor shall furnish spare parts information for all equipment furnished under this contract. The information shall be complete, legible, organized, and submitted by system in two (2) copies, and shall include:

• A list of spare parts, special tools, and supplies, for each item of


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equipment, which are either normally, furnished a no extra cost with the purchase of the equipment, or specified hereinafter to be furnished as part of the contract.

• A complete list of spare parts and supplies recommended by the manufacturer to assure efficient and continuous operation of each item of equipment for a period of two (2) years after completion and acceptance of entire work under this contract.

• The list shall show the recommended minimum stock level for reordering and shall identify all long lead items. A long lead item is defined as any item of equipment, which cannot be ready for delivery in less than six months after receipt of order. The lists shall include the following information for each recommended spare part:

Manufacturer's Part Name

Manufacturer's Name and Address

Manufacturer's Part Number

Manufacturer's Drawing Number Showing Part

Next Higher Assembly

Equipment Symbol Keyed to Contract Drawings

Recommended Number of Spares

Net Unit Price

Quantity installed per Assembly

Lead Time

Shelf Life

Peculiar Life

Peculiar cleaning, calibration, packaging and preservation requirements.

Name and address of the authorized spare parts representative and spare parts stocking source nearest to the project site.

Alternate sources of procurement.

Special Tool and test Equipment List:

Furnish to the Engineer two (2) copies of recommended list of all special tools and test equipment. The special tools and test equipment shall cover all items required for the successful operation and maintenance during a ten year equipment life. In compiling the special tools and test equipment list, the Contractor shall indicate all special tools and test equipment items that require calibration, including frequency and method. Necessary standards shall be listed immediately after each item that requires calibration, and they must be traceable to the National Bureau of Standards or other reference satisfactory to the engineer. Tool lists shall include all tools required.


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Test equipment lists shall include all equipment required for acceptable testing and calibration. The Contractor shall supply two (2) copies of all vendor-supplied catalogues and instructions for operation and maintenance of the tools and test equipment furnished under this contract.

Submission of Preliminary Parts List:

Submit one (1) copy of the preliminary parts list with recommendations f or spares within the time frame set forth above. This list is subject to the Engineer review and written approval. The Consultant may revise the listing as to quantities of recommended spares as a condition of approval. The Consultant reserves the right to order all, none or any portion of additional spare parts from the manufacturer's complete parts list and the preliminary Parts List.

Re submittals: Any re submittals or additional submittals of equipment lists, spare parts lists or associated information shall be made within thirty (30) calendar days from notice by the Engineer and all costs associated with the submissions shall be borne by the contractor.

Final Parts List: The final list shall be submitted not later than one hundred twenty (120) calendar days prior to contract completion date, in five (5) copies and shall be annotated "Final" on each sheet.

3.9 Training of Engineering Staff

Allow for training of technical staff as nominated by the client

Trainers must be qualified and certified by manufacturers. Certification of the trainers must be furnished for engineers’ approval.

Training session shall include operation, testing, commissioning and maintaining of all

Engineering services.


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Section 22 – AIR CONDITIONING, REFRIGERATION AND VENTILATION

4.1 Outdoor Design Conditions

Summer 48°C DB/30°C WB

Winter 10°C DB/90% R.H.

Indoor design condition

Main Building 22°C ±1 DB/50% ±10 R.H.

Health club Areas 24°C ±1 DB/50% ±10 R.H.

Staff and Guard areas 23°C ±1 DB/50% ±10 R.H.

Equipment shall be capable of operating satisfactorily without tripping or overheating at a maximum ambient/outside temperature of 50°C Dry Bulb.

4.2 Fresh Air Ventilation

To be in accordance with ASHRAE Standard 62.1- 2007 “Ventilation for acceptable indoor air quantity” 10 l/s per person.

4.3 Noise Levels

Occupied Area 25 – 30 dBA

Unoccupied Areas: 40 – 45 dBA

4.4 Information to Be Provided

Provide detailed dimensioned drawings in ample time for accurate positioning of:

• all openings

• all pipe sleeves

• all other anchorage and/or fixings required

• all required external louvres

• all permanent access openings in ceiling and walls for adjustment and maintenance of equipment

• all air diffusers, registers, grilles and louvres

• all floor wastes

• all plinths, curbs and bases.

4.5 CHILLED WATER PLATE HEAT EXCHANGER SPECIFICATION

GENERAL

Subject to compliance with requirements, manufacturers offering products that may be incorporated into the work include:


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The contractor/consultant shall make sure that the manufacturer and country of origin strictly comply to the preferred vendor list provided above to ensure the best quality of the units. The plate heat exchanger manufacturer shall not subcontract or purchase for resale the plates. They shall press their own pattern of plates.

The plate heat exchanger shall consist of pressed type, AISI 316 stainless steel plates so as to provide the required heat transfer area to meet the operating conditions specified. Each heat transfer plate shall have one piece moulded Nitrile gaskets. They should be glueless type with strong rubber buttons, which really ensures that the gaskets will be fixed in the groove. The gasket will be placed in the totally protected gasket groove and no part of the gasket should be visible on the assembled heat exchanger. Gaskets shall have relieving grooves to prevent intermixing of fluids and cause leak to flow to outside of unit.

Each heat transfer plate to be with herringbone corrugations to optimize heat transfer with nominal pressure losses. Corrugations to be designed to provide support to adjacent plates at evenly distributed support points to allow pressurization of each circuit to a full differential of 1.3 times the design pressure without buckling or deformation of the heat transfer plates.

The plate heat exchanger shall be designed to perform the capacities and pressure drops as shown on the schedule. Plates to be AISI 316 stainless steel with BA (Bright Annealed) finish and tapered gasket grooves.

Each heat transfer plate shall have a built in self-aligning system to accurately locate the plates in the frame assembly and prevent lateral plate movement and maintain maximum gasket contact under pressure. The plate shall have a line contact on the carrying bar to ensure alignment and the gaskets will have alignment tabs which ensure that there is no chance of mis-alignment of plate pack. Plate and frame should be designed so removal of an individual plate is possible without having to remove any plates in front or back of that particular plate.

The heat exchanger shall have suitable frame assembly. The unit cover plates shall be of sufficient thickness for the design pressure and code requirements and shall have no welded reinforcements or stiffeners. All steel surfaces shall be thoroughly cleaned and prepared for painting; painting over mill scale is not acceptable. All steel components shall be coated with a two-part alphatic acrylic polyurethane or epoxy blue paint. Provide lifting lugs designed to allow lifting of entire unit’s flooded weight.

The frame assembly shall have steel roller on moveable cover for ease of movement without additional rigging or handling equipment.

Bolts shall be provided with rolled threads to reduce galling and minimum high width hexagonal nuts to adequately distribute the load, plus ball bearing boxes at all critical closing bolts. To avoid leakage on port area, studded port design should be provided.

The complete assembly to be factory assembled and tested in accordance with PED pressure vessel code requirements or equivalent European pressure vessel code requirements or equivalent European pressure vessel code and furnished with a certification for the stated design pressure for both circuits.


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4.6 Air Handling Equipment

4.6.1 General

A. This Section of the Specifications covers air handling units. Air handling units shall be completely factory assembled by a reputed manufacturer.

B. Each unit shall be of suitable size as shown on equipment schedule

Each unit shall incorporate the following:-

The recirculating AHU should allow minimum fresh air as specified on the equipment schedule and drawings to allow ventilation requirements to the space it’s serving to.

A name plate shall be permanently affixed to every unit listing air volume, fan static pressure, coil duties.

Lifting rings shall be provided on all individual components of 35 kg mass and above for maintenance removal.

All bearings shall be supplied fully lubricated.

Spare drive belts shall be provided, in sets where applicable, for each drive in the assembly to a total of one complete change per drive.

Air Handling Units shall not exceed the overall maximum dimensions specified by ±15%.

The automatic control equipment required shall be supplied by the controls manufacturer and fitted by the equipment manufacturer, unless otherwise instructed.

Where serpentine averaging thermostat sensors required a full support system shall be provided.

All access doors shall be insulated to the same standard as the unit casing open towards the high pressure side.

All construction and applications shall comply with the requirements of BS8313 with respect of precautions against fire.

All components shall be inherently non-flammable or be made permanently so by suitable treatment.

Any viscous liquid used shall have a flash point in excess of 177ºC.

All components shall be tested in accordance with the appropriate BS, ARI or Type Test certificated as described in this specification.

All electrical items of equipment cabling, wiring, and works shall comply with the latest edition of IEE Wiring Regulations & Electricity at Work Regulations or to equivalent UL requirement. All AHU shall be double skin

Test Points shall be provided to enable comprehensive air side and water side tests to be made on each air handling unit.


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4.6.2 Air Handling Plant Construction

A. The air conditioning plants for the different areas in the plant shall comprise the individual components as shown in attachments, given at end of this section.

4.6.3 Air Handling Plant Casing

A. The unit casings shall be made of insulated double panels built into a post frame.

B. Each section of a unit shall have a post framework constructed of multi angle formed members measuring 50 mm. x 50 mm with 50 mm. deep return edge and 50 mm. seating flange fabricated from insulated aluminium for units. Corners shall be formed from mitered joints welded to form a rigid strong joint cleaned off smooth.

C. Frame posts and cross members shall be constructed to incorporate 25 mm. nominal thickness of injected polyurethane insulation which shall be sealed in position with an additional angle member riveted or spot welded in place.

D. All frameworks shall be painted for protection against corrosion after manufacture. Lifting eye bolts shall be provided on the corners of the sections and shall be removed after installation, the holes being plugged off with suitably sized flush fitting brass plugs.

E. Insulation materials shall be tested to and shall comply with BS4765 part 7 and achieve class 1 ratings.

F. Insulation shall have a thermal conductivity not greater than 0.036 W/mºC and have a minimum thickness of 50mm.all AHUs shal be double skin

G. Insulates incorporating CFCs polyurethane in their manufacture, woodwool slabs, polystyrene and urea formaldehyde shall not be used.

H. If mineral fibers material is used the density shall not be less than 48 kg/m3 and provisions shall be made to ensure that no settling in materials occurs

I. Panels shall be formed from two sheets of 1.2 mm. thick aluminium hav ing 25 mm. returned edges riveted together. Internal shall be of aluminium 1.0 mm.

J. The insulated top and bottom panels of the units shall be designed to withstand the weight of a man and the necessary equipment for maintenance purposes, by forming the inner metal surface in a number of tray pieces which fit inside the complete outer panel section.

K. Panels shall be adequately stiffened and braced to prevent flexing and drumming and as necessary to maintain rigidity.

L. All panels shall be of the bolted in removable type: panels fitting


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flush into frames and corner posts to give smooth external faces.

M. Joints between panels and framework shall be sealed air tight with non hardening plastic ribbon seal seating strip.

N. The completed air handling unit casings shall be designed and installed to reduce the fans sound power level radiated into the plant room, or roof level, by the amounts as specified in Schedule S3.01. The density and type of thermal and acoustic insulation to be sandwiched within the panels shall be selected to achieve the panel attenuation specified in Schedule S3.01.

Schedule 3.01

Frequency HZ 63 125 250 500 1K 2K 4K

Power Loss dB 22.5 28 27 30 35 27.5 29

O. Framework and panels shall be constructed so that bare metal bridges linking inside to outside will not occur. The units shall be designed to prevent condensation from occurring from any cool surface of the unit.

P. Individual panel sizes shall not be greater than 3.5m by 1.75 m. where sections are dimensionally larger, more than one panel shall be used.

Q. All panels and section framework shall be of manageable proportions for transportation and shipment.

R. The air handling plants shall be painted at the manufacturer's works before dispatch and shipment internally with a complete corrosion resistant paint finish.

S. The air handling plants shall be decoratively painted externally in accordance with the painting and decorating Clause of the Building Specifications.

T. Air handling units which are installed externally shall be provided with rainwater hood completely extended above the air handling unit. The unit shall be decoratively painted with final two coats suitable for the weather conditions that prevail in Abu Dhabi

U. All units intake and exhaust shall be provided with rain water hood as well as birds screen.

V. Doors in access (empty) sections and fan sections shall be suitably sized for man access into and for easy maintenance of the equipment. Each door shall be of double skin construction with an infill of thermal and acoustic insulation to provide acoustic properties equivalent to the unit panels.

W. Doors shall be designed to be an airtight fit and match the unit panels. The doors shall be double hinged to ensure a good seal onto the gaskets and shall include chromium plated handles, seals and fasteners to hold the neoprene seals in compression.


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X. All doors shall be openable from outside and inside the section and shall be provided with door locks, which can be locked from outside the unit but which can still be opened from the inside.

Access doors shall be provided on both sides of each unit in access sections and fan sections.

4.6.4 Filters

4.6.4.1 Bag Filters

A. Where indicated in the Equipment schedules sheets, bag filter sections shall be incorporated.

B. These can comprise a composite section of the air handling unit which shall be arranged to enable side withdrawal of the filter media from the unit.

C. Holding frames shall be constructed from aluminium sheet steel with suitable seals provided to prevent air bypass around the filters.

D. The filter media shall consist of high density glass micro fibre media with individual dust holding compartments, reinforced with a backing to form a lofted filter blanket. The filter media shall have an average arrestance efficiency of not less than 95 % and atmospheric dust spot efficiency 80- 90 % on ASHRAE test Standard 52-76 or to EU grade (EU-7).

E. The configuration of the dust holding compartments shall be controlled by means of progressive link stitching. The stitching shall be such that it forms a supported compartment resulting in uniform velocities in the passages of the air exit side of the filter.

F. The dust holding compartments shall be equipped with a minimum of 516 support points per square meter of the filter media.

G. All stitching points shall be sealed with a hot melt adhesive.

H. Each filter bank shall be fitted with an inclined tube manometer connected at the works by the manufacturer.

4.6.4.2 Panel Filters (Prefilters)

A. The filter media shall be natural, synthetic or glass fiber or fabric fibrous material shall be covered with a final scrim backing. They shall be replaceable filter elements in either mat or pad form, suitable for attachment to the upstream face of the bag filter banks.

B. They shall be fixed in permanent holding frames, and clips to ensure quick and easy removal of pre filters. The arrangement of the prefilters shall not impair access to and serviceability of the bag filters. All frames and clips shall be of aluminium .


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C. All filter elements shall be bedded firmly into permanent frame seals and pressed firmly and continuously onto face of bag filter frame by a cam operated mechanism or a series of accessible clips for front withdrawal type to prevent air by passing.

D. Panel filter assemblies shall be 50 mm. thick unless otherwise specified and have efficiencies of not less than those given below for various types of media when tested, to BS 2831 Test Dust No. 2, or ASHRAE 52-76 test.

Typical performance requirements:

Media Nominal Initial

Volume Face Velocity PD Efficiency at Design

Type m/s Pa BS2831 - ASHRAE 52-76

1 2.0 70 92 83

2 2.0 80 96 86

Media No. Typical Construction

1. Laminated two stage glass filament media.

2. As type 1 followed with a synthetic scrim.

E. The filter media shall provide a normal servicing frequency of 4 months with a rise in pressure drop from clean to dirty of not more than twice the initial pressure drop.

F. Each filter bank shall be fitted with an inclined tube manometer connected at the works by the manufacturer.

Panel Washable Type Filters

A. The filter media shall be combined of expanded and slit aluminum, bonded together in various patterns to form a unique baffle design. This rust-proof aluminum should be easily washed.

4.6.5 Air Handling Units Dampers

A. Air regulating dampers in air handling plant sections shall be assembled from individual dampers bolted together to form a multiple unit. The dampers shall be of the multi leaf opposed blade type.

The assembled unit shall be bolted to angle and channel galvanized iron frame work built into the unit casings.

B. The multiple damper unit shall be sized for the full air handling unit area, without blanking plates.

The face velocities shall be not greater than 5.08 m/sec. (1000 f.p.m.). Closed blade leakage should be <10 m3/h.m2 with a 100 Pa pressure differential.

C. Complete damper assemblies shall be operated in vertical


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banks across the width of the unit or the adjustment of vertical banks damper regulators with locking quadrants shall be installed inside the unit casing integral with the vertical bank. Damper regulators shall be marked to indicate the damper position.

D. Dampers shall be designed, selected and installed such that they do not whistle, whine or produce any recognizable pure tone. The regenerated noise from dampers shall not exceed the induct sound power level at that point of the ductwork system, also the regenerated noise when combined with the induct sound power lev el at that point must not exceed the criterion in any room over which the duct passes subsequently or in a room which is subsequently served by that ductwork system.

E. Damper frames shall be fabricated from mild steel channel with all four corners of the frame braced, and shall be electro galvanized after manufacture.

F. Damper blades shall not be greater than 250 mm. in width. Blades made from aluminum extruded sections. The blades shall have interlocking edges and cross connecting brackets. Each blade shall have neoprene edging inserted along its length to ensure an airtight seal and whistle free operation.

G. Damper sections shall be built to size using the lowest practicable number of equal width blades inter-connected on every other blade. Any resulting small air gap top and bottom between blades and channel frame shall be blanked off. Damper blade side stops shall be overlapped and designed to contact blade edges and reach the blade axles.

H. Damper blade axles and push rods shall be of the blind end type with the bearings mounted flush with the inside face of the damper frame. The bearing shall be pre packed with grease and the open end sealed with a rubber '0' ring seal to prevent air leakage. The opposed blades action only, via gears, made from special anti-static plastic (ABC), temperature resistant to 100 C. Bearing seal achieved using a plastic elastomer on rear of gears between case and gear. Material: Perbunan.

I. Multizone air handling units shall include mixing dampers for each individual zone. The dampers shall provide optimum control of temperature by modulating the mixing air dampers. The damper sexton shall be extended to full width of the units. The dampers blades shall securely mounted on a common steel rod and positioned at 90 degree angles in relation to each other.

4.6.6 Air Cooling Coils

A. Air cooler batteries contained within air handling plants shall be sectionalised. The whole air cooler battery shall be made up of individual cooler batteries.

B. The coolers shall be bolted onto a steel channel and angle iron framework built inside, and bolted to the unit. The framework


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shall be protected against corrosion and all nuts and bolts shall be cadmium plated.

C. Airtight blanking plates shall be provided to seal the remaining portions of the cross sectional area of the air handling unit when the cooler battery is less than the cross sectional area of the unit. Sufficient space shall be left between the battery assembly and the top and bottom of the units for bolting the individual batteries in position in situ.

D. Each cooler battery flow and return connection shall be extended through the unit side casings with puddle type aluminium extension flanges ending to match flange pipe joints within the units. Where two cooler battery sections are mounted end to end across the width of the unit, the primary flow and return connections shall be handed so that the coil can be connected to the service mains at each side of the unit.

E. Each air cooler battery shall be manufactured in accordance with the following

Specification. Cooling battery coils shall be constructed from 16 mm. 0/D solid drawn copper tube mechanically expanded into collar spaced ribbed and punched aluminum fins of maximum density 400 fin/meter (10 fins/inch) connected to copper. The fin and tube matrix shall be treated after manufacturing with corrosion protective layers such as acrylic coatings or other approved materials. Coating shall be suitable for disinfects and cleaning chemicals.

F. Each air cooler battery shall be provided with a stainless steel drip tray at the base of each section of the battery. Each drip tray shall be tanked and sealed into the assembly. Each drip tray shall be fitted with air deflectors and 25 mm pipe drain. Each intermediate drain pan shall be connected with a drain pipe feeding into the main air handling unit drain pan as specified in Section 3.13.

Drain pans shall be designed to minimize the risk of legionella.

The air velocity across the cooling coil shall not exceed 2.5 m/sec.

Accessories

Each coil shall be provided with the following accessories:-

• Isolating valve

• Balancing valve with by-pass globe at the main return.

• Modulating control Valve

• Self-Seating Plugs

• Strainer

• Air Vent


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4.6.7 Electric Heating Coils (where applicable)

Install heating terminals as indicated and drawings, in accordance with equipment manufacturer’s written instructions and with recognized industry practices, to ensure that heating terminal equipment fulfills requirements. Comply with applicable installation requirements of Electrical Code.

Air heating batteries shall be manufactured in compliance with National Electrical Code (NEC) all controls, and ancillary electrical equipment shall be constructed in accordance with Underwriters Laboratories (UL) Standard.

All electric heating coils ancillary electrical components shall be listed and labeled by Underwriters Laboratories (UL).

The contractor shall submit ladder-type wiring diagrams for power and control wiring required for final installation of electric heating coils and controls. Clearly differentiating between portions of wiring that are factory-installed and portions to be field-installed.

The coil shall be manufactured to the following: -

General: Voltage, size, kW, steps and control voltage shall be as scheduled.

Electric heating coils sections shall be integral with indoor unit.

Heaters shall be UL listed for zero clearance and meet all Electrical specification requirements.

Multi-stages electric heating coil shall be mounted on mill galvanized steel tracks for slide out slide in service. Heating elements shall be 80% nickel and 20% chromium.

Heaters shall be arranged in steps to prevent stratification when operating at less than full capacity.

Element terminals shall be manufactured from stainless steel; insulators and bracket bushing of non-porous ceramic. Machine crimp elements to terminals.

Frame shall be constructed from heavy gauge galvanized steel with galvanized steel brackets. Spot-weld stiffening ribs and gussets to the casting.

Terminal box construction shall be spot welded with solid, hinged cover which is totally enclosed without louvers or grilles as per UL Standard 1096.

Heaters shall be provided recessed terminal box, when coils are installed in ducts with internal obstruction greater than 25 mm.

Heaters shall be interchangeable for horizontal left or right or vertical up airflow except when position sensitive mercury contactors are built in. In these cases airflow direction shall be as scheduled.

Primary and secondary safety devices shall be provided for over


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temperature protection. These shall be disc-type automatic reset thermal cutout for primary protection. For secondary protection, provide sufficient number of replaceable cutouts in the power lines which shall de-energize elements if the primary cutout fails. These safety devices shall be serviceable through the terminal box without removing the heater from the indoor unit.

A wiring diagrams shall be furnished for each heater. Diagram shall include recommended supply wire gauge per electrical specifications and fuse sizes. Typical wiring diagrams are not acceptable.

Each electric heater shall be provided with built-in components, which shall include the following:

1. Safety interlocking disconnect switch.

2. Disconnecting break magnetic contactors.

3. Transformer with primary fusing per UL.

4. Pressure - type airflow switch set at 17.5 N/m2.

5. Supplementary circuit fuses.

6. Separate load and control terminal blocks to accept conductors.

In addition to the above provide the following special features:

Special Construction:

• Dust-tight Terminal Box

• Rain-tight Construction (non-removable flange)

• Over-temperature Protection:

• Manual Reset thermal Cut-out in control circuit in series with automatic.

• Switching Devices and Controls:

• Door interlock switch (to break control circuit)

• Step Controller(s):

Input: Electronic Time Delay Relay

Comb out damaged fins where bent or crushed before covering elements with enclosures to maintain the noise lev el and heating capacity.

Clean dust and debris from each heating terminal as it is installed to ensure cleanliness.

Coordinate with Electrical work, including wiring/cabling work, as necessary to interface installation of heating terminals with other work.

Testing: Upon completion of installation of heating terminals test heating terminals to demonstrate capability and compliance with


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requirements

4.6.8 Silencers (Sound Attenuators)

The degree of silencing for any fan and ductwork system is determined by the amount of silencing required to obtain the specified noise levels given as N.C. levels.

Silencers installed on the supply ductwork system side of fans shall include for the effects of regenerated noise, duct breakout noise, noise emanating from diffusers and noise from any other ventilation systems serving the area.

Silencers installed on the atmosphere connection side of fans and air handling equipment shall include for the effects of regenerated noise in the silencer and noise from other fans drawing or exhausting air to or from the atmosphere.

Silencers shall be of the splitter type, protected to ensure that erosion of the attenuating element does not occur. The materials and construction shall prevent carryover or migration of the material into the air conditioning distribution system. The regenerated noise of all silencers shall be predicted and shall not increase the induct sound power lev el at any point (i.e. shall be more than 10dB below the induct sound power level).

The regenerated noise, when combined with the induct sound power level at that point, shall not exceed the criterion in any room over which the duct subsequently passes, or in a room which is served by that ductwork system.

Prefabricated unit silencers shall be constructed with the silencer splitters inserted into unit casings secured by cadmium plated bolts through retaining angles.

Main air handling unit silencers shall be constructed with the silencer splitters in galvanized sheet steelcasings constructed with a profiled galvanized steel frame bolted to angle frames with in the air handling unit casings. All retaining angles and framework shall be adequately protected against corrosion.

Noise levels within the conditioned space shall be no greater than those set out in Schedule below.

In his final assessment of conditioned space noise levels the Contractor shall make due allowance for the additive effect of all point sources of noise.

4.6.9 Air Handling Units Fans

A. Supply air fans and re-circulation air fans mounted within air handling unit sections shall be centrifugal casing type designed and manufactured as specified herein.

B. Fans shall be double inlet, double width centrifugal forward curve air fare or backward curved, with high efficiency.

C. Fans shall be suitable for indirect drive by matched vee belts


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and pulleys.

D. Fans shall be selected for slow speed running low sound level and high efficiency. All fans shall be selected to be operated by at least 10% in capacity over the design volume specified (As per schedule).

E. Fan casings and scrolls shall be fabricated from heavy gauge mild steel plate adequately stiffened and supported. Fan casings shall be rigid and completely free from vibration and drumming and capable of with standing the pressures involved without leakage or distortion. Fan casings shall be continuously welded construction split as required to pass through available unit access doors.

F. Fan casings shall be bolted construction for ease of installation, the number of sections being dependent upon the size of the fan and access available for future removal and replacement.

G. Bearing blocks shall be carried on opposite sides of the fan casing on bearer bars forming a part of a rigid fabricated steel structure integral with the casing.

H. Fan tip speed shall not exceed 10 m/s.

4.6.10 Fan Drives And Guards

A. Fan drives for centrifugal fans shall be multiple vee belts and variable pitch pulleys.

B. Pulleys of the taper lock type may be used for drives up to 30 KW output. The pulleys shall be keyed to the shafts after commissioning.

C. Alternatively, and where drives are above 30 KW out-put, the pulleys shall be secured to the fan and motor shafts by fitting into machined keyways. Keys shall be easily accessible so that they can be withdrawn or tightened and shall be accurately fitted so that the gib head does not protrude beyond the end of the shaft.

D. Each fan set shall be supplied with initial sets of pulleys and drives to give the duties as designed.

E. Fans with standby motors if require shall be provided with two sets of pulleys, one on each side of the fan.

F. Vee belt drives shall comply with BS.3790 and shall be capable of transmitting not less than the rated wattage output of the motor with one belt removed.

G. Machined bolts, nuts and washers shall be used for the assembly of fans: all bearing surfaces for the heads of bolts of washers shall be counter-faced.

All fan casings shall be fitted with bolted on air-tight inspection door and a drain plug.


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H. Fan casing shall be fitted with flanged outlets for duct connections and shall have rigid spigot inlets truly circular and free from dents.

I. Inlet cones shall be manufactured to close tolerances to avoid turbulence at the air entry to the impeller. All internal and external ex posed casing surface shall be zinc sprayed for protection against corrosion.

J. The fan impeller wheel and blades shall be robustly constructed from mild steel sheet with fabricated steel or cast iron boss with back plate when required. The boss shall be bored and keywayed for the shaft. Impellers shall be zinc sprayed against corrosion.

K. Impellers shall be rigidly braced to ensure concentricity and eliminate vibration and shall be certified as being statically and dynamically balanced on their shafts at the manufacturers works.

L. Fan driving shafts, of ample section for the loading, shall be of high tensile mild steel, precision turned, ground and polished.

Key ways shall be provided for securing the impeller and riving pulley.

M. All fans shall be fitted with sealed life lubricated ball or roller bearings mounted in cast iron plumer blocks.

No fan drive shall be fitted with less than two belts.

N. All vee belts shall be of the anti-static type suitable for operation in temperatures likely to prevail in the plant rooms.

O. Guards shall be provided for all open unprotected air inlets to centrifugal fans, for vee belt drives and pulleys whether within unit casings or not.

P. For v- belt drives the guards shall be of galvanized steel wire not less than 2.5 mm. diameter formed into a mesh not greater than 25 mm. attached to a rigid galvanized steel framework of rods not less than 10 mm. diameter.

Q. Drive and pulley guards shall be made to be readily removable to permit belts to be changed.

R. Adequate access panels shall be provided in the guard to allow tachometer readings of the shafts to be taken and the belt tension to be tested.

S. Allowance shall be made in the dimensions of the guard and the size and position of access panels for the adjustment of the motor on its side rails. Fans with standby motors shall be provided with two guards one on each side of the fan.

4.6.11 Fan Motor

A. Electric motors shall be continuously rated of metric frame construction and shall comply with BS.5000 and BS.2048.


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B. Each motor shall be rated at 130 percent (%) of the fan's rating when running at the duties as designed. Fan motors shall be squirrel cage, total enclosed, fan cooled type wound for 415 volts, 3 phase, 4 wire, 50 hertz electrical supply. Motor insulations shall be to Class F. Thermistor type overheating cut outs shall be provided in the motor windings.

C. All motors shall be suitable for horizontal foot mounting and be complete with slide rails and belt adjusting bolts.

D. Standby motors, when required, shall be complete as for duty driving motors with slide rails and shall be permanently mounted and wired within the air handling units so that in the event of failure of the duty motor the standby motor can be started without any belt changing, etc.

E. Each fan and motor assembly including standby motors shall be mounted on a fabricated and welded rolled steel channel iron base frame, suitably drilled for mounting upon anti-vibration mountings within the air handling unit fan section casing.

4.6.12 AntiVibration Treatment

A. All equipment containing moving parts generating noise or vibration shall be mounted or placed upon specially designed isolators. All connections to such equipment shall be fitted with flexible connectors to prevent transmission of such noise and vibration to the structure or to other areas of the building or to other pieces of equipment.

B. Each centrifugal fan and motor channel base frame shall be mounted on anti-vibration mountings as specified herein.

C. The resilient material of the anti-vibration mounting shall be rubber or neoprene for static deflections of less than 12 mm. and steel spring for deflection of greater than 12 mm. Steel springs shall contain a series of rubber or neoprene pads to contain and isolate the structural borne noise component. Anti-vibration mounting shall be adjustable in height to lev el the machine foundation except where the static deflection of the mount is less than 6 mm.

D. Where practicable, anti-vibration mountings shall be removed for shipment. Where impracticable anti vibration mountings must be provided with transit bolts and nuts to hold them rigid to the frame of the machine.

Flexible joints shall be provided on fan inlet and outlet connections as required.

E. Flexible joints and material shall be of, or be protected by, material having a fire penetration time of not less than fifteen minutes when tested in accordance with BS476, Part 1, Section 3.00. The material shall be of the glass fiber cloth ty pe and waterproof. Canvas material will not be permitted.

F. The width of the joints from metal edge to metal edge shall not


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be less than 100 mm. and not greater than 250 mm.

G. All flexible joints shall be between flanged ends. The flexible material flange shall be backed by an angle or flat iron flange and the flexible material held securely between the metal faces of the steel section.

H. All electrical conduits and connections in contact with fans, bases, motors or supports shall be fitted with flexible sections to avoid nullification of the anti-vibration treatment provided.

I. Flexible conduit shall be watertight, PVC sheathed, spiraled metal type. The conduit shall be terminated at boxes and equipment with compression glands. An additional PVC insulated stranded tinned copper earthing conductor not less than 6 mm. diameter shall be drawn into flexible conduits and connected to the earth terminals at each end of the flexible run.

4.6.13 Dehumidifier for AHU serving to Swimming Pool

1. The dehumidifier shall be factory installed in built in the air handling unit.

2. It shall include a factory installed reheat to control temperature during dehumidification.

3. It shall be two or three stage electrical heating and shall be controlled by unit controller.

4. The electrical reheat coil shall be low watt density, stainless steel fin tubular construction, protected by thermal safety switches.

It shall have rating as indicated in drawings and schedules.

4.6.14 Tests and Performance Certificates

A. The Contractor shall submit for approval before placing his order for the AHU's the following information:

a) A description of the actual test procedures used by the fan manufacturers.

b) A laboratory test sheet showing results of a test for fans typical of the types that will be ordered.

c) A fully documented list of total sound power levels in each of the second octave bands between the frequencies of 63 Hz and 4 KHz for each fan.

d) The Contractor shall provide fan performance certificates for each fan tested in accordance with the requirements of B.S.848, Parts I & II.

e) The characteristics of each fan's performance shall include curve relationships of volume, pressure, efficiency and power absorbed at constant speed.

Mechanical Specs for Pool

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