GAIL (India) Limited
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GAIL (India) Limited

GAIL (India) Limited GAIL (India) Limited

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13.07.2015 Views

3All the equipment shall be thoroughly tested and checked for leaks. All safety controlsshall be suitably set and a record of all setting shall be furnished to the Engineer incharge.4.0 SPLIT UNITS:Air cooled split unit shall be as per approved make, energy efficient scroll hermitically orsemi-hermitically compressor complete with vibration isolators & factory installedcontrols (like HP & LP cutouts, inter locking Fan & Compressor, Thermostat withselector switch etc) & accessories including wiring. Efficient cooling coil shall beselected for low velocity with 3/8"/1/2" OD copper tubing having extended aluminiumfins. Hydraulic expansion of tubes assures tight bonding between tubes & fins for highheat transfer. Tubes shall be arranged in a staggered design for best air contact thusgiving low bypass. The cooling coil circuits are fed with liquid refrigerant through thethermostatic expansion valve and a distributor. Blower of an evaporating unit shall bestatically and dynamically balanced and shall be selected to give required airflow asidentified in the drawings. Filters shall be minimum 25mm thick synthetic type orequivalent wire aluminium frame. Drain pan shall be of 18 gauges insulated withexpanded polyethylene sheet. Casing shall be heavy gauge factory painted to providebetter protection against rusting.Remote air cooled condensing unit shall have to be most efficient condenser coilsmade out of copper tubing with extended aluminium fins. Tubes shall be arranged in astaggered design for better efficiency. Condenser fans shall be selected to operatequietly for required CFM to keep condensing temperature low. The compressor may bein the indoor unit or with the outdoor unit, but, it should be capable of operatingcontinuously even at high ambient of 46 deg C (115 deg F). The condensing unit shall beinstalled with M.S. base frame, alongwith cushy foot mounting vibration isolation pads.Bolted and clamped with the system. The compressor for 1.5 & 2 Tr units shall behermetically sealed Rotary/Reciprocating.Interconnected refrigerant piping between outdoor unit & indoor unit shall be of heavygauge copper complete with thermostatic expansion valve, liquid line strainer, drier, shutoff valves, high & low pressure gauges including insulated suction line. 25mm thickneoprene rubber pads shall be supplied for each indoor/outdoor units. The units shall betested in accordance with IS: 1391. The power supply shall be provided at outdoor/indoorunit as per manufacturer's requirement.5.0 TESTING:Unit capacity in tons Refrigeration, shall be computed from the temperature readings andair-flow measurements. Flow measurements shall be preferably by a hot-wireanemometer or a velometer. Computed results shall conform to the specified capacitiesand the power consumption shall conform to the figures furnished by the manufacturer.6.0 PAINTING:Shop coats of paint that have become marred during transportation or erection shall becleaned off with mineral spirits, wire brushed and spot primed over the affected areas,then coated with two coats of enamel paint to match the finish over the adjoining shoppaintedsurfaces.

47.0 CONEENSATE & DRAIN PIPING:7.1 All pipes to be used for condensate drain shall be approved make and fittings as per BIS4736 or galvanized steel class B (medium class) conforming to relevant BIS codes.7.2 All jointing in the pipe system shall be by screwed fittings using non-hardening lubricant assealing material and/or by screwed flanges using 3mm 3 ply rubber gaskets. Pipe threadsand flanges shall be as per BS 534 and BS 45047.3 All pipe supports shall be mild steel, thoroughly cleaned and given on primary coat of redoxide paint before being installed.7.4 Fittings shall be galvanized steel 'Medium Class' malleable casting of pressure ratingsuitable for the piping system. Flanges shall be of approved make. Supply of flanges shallinclude bolts, washers, gaskets as required sufficient number of flanges and unions shall beprovided for future cleaning and servicing of piping. Tee-off connections shall bethrough equal or reducing tees. All equipment and valve connections, or connections toany other mating pipe shall be through unions/screwed flanges upto 50 mm dia andthrough screwed flanges for larger diameters, or as required for the mating connections.7.5 All condensate drain piping shall be insulated as per the section 'Insulation' Cold waterpiping within the building may also be insulated.7.6 After the piping has been installed, tested and run for atleast three days of eight hourseach, all piping and pipe supports shall be painted with one coat of red oxide paint & twofinish coats of 3 mils each of approved color of synthetic enamel paint conforming to IS23797.7 The direction of flow of fluid in the pipes shall be visibly marked with identifying arrow.8.0 REFRIGERANT PIPING:a. All refrigerant pipes and fittings shall be type L' hard drawn copper tubes and wroughtcopper fitting suitable for connection with silver solder phos copper or as perManufacturers recommendations.b. All joints in copper piping shall be sweat joints using low temperature brazing and/orsilver solder. Before jointing any copper pipe or fittings, its interior shall be thoroughlycleaned be passing a clean cloth via wire or cable through its entire length. The piping shallbe continuously kept clean of dirt etc. while construction the joints. Subsequently, it shallbe thoroughly blown out using carbon-dioxide/nitrogen.c. Refrigerant lines shall be sized to limit pressure drop between evaporator andcondensing unit to less than 0.2 kg per Sq.cm.d. Removable type combination drier and filter shall be installed in liquid line of therefrigeration system incorporating a three way valve bypass. After ninety days ofoperation, liquid line drier and filter cartridges must be replaced by contractor atactual cost to be borne by owner.

3All the equipment shall be thoroughly tested and checked for leaks. All safety controlsshall be suitably set and a record of all setting shall be furnished to the Engineer incharge.4.0 SPLIT UNITS:Air cooled split unit shall be as per approved make, energy efficient scroll hermitically orsemi-hermitically compressor complete with vibration isolators & factory installedcontrols (like HP & LP cutouts, inter locking Fan & Compressor, Thermostat withselector switch etc) & accessories including wiring. Efficient cooling coil shall beselected for low velocity with 3/8"/1/2" OD copper tubing having extended aluminiumfins. Hydraulic expansion of tubes assures tight bonding between tubes & fins for highheat transfer. Tubes shall be arranged in a staggered design for best air contact thusgiving low bypass. The cooling coil circuits are fed with liquid refrigerant through thethermostatic expansion valve and a distributor. Blower of an evaporating unit shall bestatically and dynamically balanced and shall be selected to give required airflow asidentified in the drawings. Filters shall be minimum 25mm thick synthetic type orequivalent wire aluminium frame. Drain pan shall be of 18 gauges insulated withexpanded polyethylene sheet. Casing shall be heavy gauge factory painted to providebetter protection against rusting.Remote air cooled condensing unit shall have to be most efficient condenser coilsmade out of copper tubing with extended aluminium fins. Tubes shall be arranged in astaggered design for better efficiency. Condenser fans shall be selected to operatequietly for required CFM to keep condensing temperature low. The compressor may bein the indoor unit or with the outdoor unit, but, it should be capable of operatingcontinuously even at high ambient of 46 deg C (115 deg F). The condensing unit shall beinstalled with M.S. base frame, alongwith cushy foot mounting vibration isolation pads.Bolted and clamped with the system. The compressor for 1.5 & 2 Tr units shall behermetically sealed Rotary/Reciprocating.Interconnected refrigerant piping between outdoor unit & indoor unit shall be of heavygauge copper complete with thermostatic expansion valve, liquid line strainer, drier, shutoff valves, high & low pressure gauges including insulated suction line. 25mm thickneoprene rubber pads shall be supplied for each indoor/outdoor units. The units shall betested in accordance with IS: 1391. The power supply shall be provided at outdoor/indoorunit as per manufacturer's requirement.5.0 TESTING:Unit capacity in tons Refrigeration, shall be computed from the temperature readings andair-flow measurements. Flow measurements shall be preferably by a hot-wireanemometer or a velometer. Computed results shall conform to the specified capacitiesand the power consumption shall conform to the figures furnished by the manufacturer.6.0 PAINTING:Shop coats of paint that have become marred during transportation or erection shall becleaned off with mineral spirits, wire brushed and spot primed over the affected areas,then coated with two coats of enamel paint to match the finish over the adjoining shoppaintedsurfaces.

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