Repair/Maintainance of central AC plants at AF Stn Mamaura

Amount

Material and labour for de-scaling and cleaning of chocked pipes of water circulating lines including service valves, condenser (heat Exchanger) to cooling tower by circulating concentrated de-scaling solution (concentrated hydrochloric acid) mixed with water in suitable proportion till the complete deposits/scale is removed but min 24 hours whichever is later & as ordered, circulating through pump, servicing of valves, cooling tower, water spray assembly, cleaning with suitable size of drill rod, wire brush including dismantling and connecting all dismantled components in proper position after servicing/ overhauling/greasing etc. replacement of packing gasket 3mm thick, nuts, bolts with washer, testing of water line for leakage, complete all as specified and directed by Engineer-in-Charge for central AC plant central AC plant 2x37.5 TR capacity. Note: De-scaling of one condenser/ Chiller will be consider as one job.

M&L for painting the interior and exterior parts of cooling towers with epoxy seal paint as per the manufactures specifications including prepairing the surface of cooling towers afters removing all the PVC fills, nozzles, ID fan and cleaning the water collecting tray for algae free surfaces using necessary detergent chemicals complete sealing the leakage on the body if any while apply the epoxy sealing paint complete to the entire satisfaction of Engr-in-Charge.

M&L for taking out the damaged insulation portion of existing refrigerant line/ chiller water pipe line/ hot water pipe line on any sizes and cleaning the pipe and insulation with thermocol of pipe section TF quality wrapped around pipe and fixing it with GI wire mesh including wrapped with SS sheet and site clearance of old debris complete all as specified and directed by Engr-in-Charge.

Fixing only existing GI shed of AC ducts with appropriate anchors bolt with making necessary arrangement of scaffolding to fecilitate the fixing of the loose shed on wall complete all as per direction by Engr-in-Charge

M&L for carrying out pressure leak test by nitrogen gas of the system of AC plant 2x37.5 TR for leak proof valve joints, seal & other connected contracts etc. including identifying and rectifying of leakage (if any) and maintaining constant pressure of 160 PSI on lower side and 300 PSI on higher side for 24 hours, complete all as directed by EIC. Note : T&P and nitrogen gas shall be arranged by the contractor at his own cost.

Cleaning of cooling tower of central AC plant of cap 2X37.5 TR by applying the suitable chemical and removing al the deposited dust, forign material, cleaning of filter and servicing of CT fan motor, sprinklers and PVC arms complete all as specified and directed.

Taking out the filter from AHU up to 12000 CFM cleaning the cooling coils/hot water coils/inside layers of modular AHU panel with suitable chemical and jet of water pressure with pump and remove all the scale and foreign material deposited in side coil followed with air pressure to sweep up all the paticles and ensure through flow of air over the cooling coils including cleaning of blower section/stainless steel drain pan with all drain GI pipes complete as specified and directed and refixing the air filter after cleaning of central AC plant 2x37.5 TR complete all as specified & directed.

M&L for charging of refrigerant gas (R-407C) in 2x37.5 TR central AC plant & 3x11 TR AC plant plant including provision of all T&P as required at site complete all as specified & directed.

Replacement of AHU Pre filter of 50 mm thick washable type with filter element made out of synthetic non woven media supported by HDPE mesh on both side including stitching in diamond pattern complete including frame and suitable for efficiency 90% down to 10 micron EU-3 type complete all as directed & specified,of 2x37.5 TR central AC plant complete all as specified & directed.

Replacement of AHU secondary dry type cleanable and easlily maintainable air filter in 2x37.5 TR central AC plant, suported by GI wire and folder to form accordion plate having an efficiency of 95% down to 5 micron EU-5 type complete all as directed & specified.

M&L for Painting with two coats of synthetic enameled paint over one coat of red oxide primer of all steel pipes / AC Plant structures, as per the standard colour coding including painting of refrigerent/water pipe lines & mark indication aeromark in the central AC Plants of Aauditoriumm/signal section.complete all as directed in Engr -in-Charge.

M&L for replacement of PVC fills of size 825mmx300mmx300mm.complete all as specified & directed.Make: - MIHIR/SUVIDHA/ AVIRATS.

M&L for replacement of PVC fills of size 1200mmx600mmx100mm.complete all as specified & directed.Make: - MIHIR/SUVIDHA/ AVIRATS.

Supply & Fixing in replacement fan belt for cooling tower fan of central AC Plant of cap 2x37.5 TR as per site requirement and as per sample complete all as specified & directed. Make : DUNLOP/FENNER/ECODRIVE

Dismantling and taking out existing unserviceable pressure gauge of any description and in any position and Supplying and fixing Freon gas pressure gauge of range 0 - 150 PSI, 150 mm dia complete all as specified & directed. Make : Fibig /ACCEL/WAAREE/WIKA/MAHAVEER

Supply & Fixing in replacement water temperature guage fitted in water circulation cicuit, Range- 0 to 50 deg/0 to 30 deg centigrade 0 to 120 deg/0 to 20 deg faranheat) complete all as specified & directed. Make - IEBIG/GURU/GLUCK

Supply & Fixing all thimble with nut and bolt of various size as per site requirement and all as specified and directed.

M&L for complete overhauling of 5HP water pump (Make Kirloskar/ Pump Nos-A6ZCL000066,A6ZCL000032,AZALY0354) cleaning, oiling, greasing and replacement of ball bearing and other worn out/unsv parts of pump if required complete all as directed & spd by Engr-in -Charge.

M&L for complete overhauling of 7.5 HP water pump (Make Kirloskar/ Pump Nos-D12010758226,A6ZCL000032,A6ZCL0000324) cleaning, oiling, greasing and replacement of other worn out/unsv parts of pump if required complete all as directed & spd by Engr-in -Charge.

Taking out unsv/damaged scroll compressor from Chiller unit in central AC Plant of cap 2x37.5 TR and Supply & Fixing scroll compressor 25 TR capacity, cooling capacity 147100 Btu/h, suitable for low ODP refrigrant like R407C including initial compressor oil filling to appropriate level complete all as directed by Engr-in- Charge as well as testing and commissioning as per the entire satisfaction of Engr-in-Charge. Make: Denfoss, Model:SZ 185S4RC

Material and labour for de-scaling and cleaning of chocked pipes of water circulating lines including service valves, condenser (heat Exchanger) to cooling tower by circulating concentrated de-scaling solution (concentrated hydrochloric acid) mixed with water in suitable proportion till the complete deposits/scale is removed but min 24 hours whichever is later & as ordered, circulating through pump, servicing of valves, cooling tower, water spray assembly, cleaning with suitable size of drill rod, wire brush including dismantling and connecting all dismantled components in proper position after servicing/ overhauling/greasing etc. replacement of packing gasket 3mm thick, nuts, bolts with washer, testing of water line for leakage, complete all as specified and directed by Engineer-in-Charge for central AC plant 3x20 TR capacity.

M&L for carrying out pressure leak test by nitrogen gas of the system of AC plant 3x20 TR for leak proof valve joints, seal & other connected contracts etc. including identifying and rectifying of leakage (if any) and maintaining constant pressure of 160 PSI on lower side and 300 PSI on higher side for 24 hours, complete all as directed by EIC. Note : T&P and nitrogen gas shall be arranged by the contractor at his own cost.

Dismantling liquid line strainer from the 3x20TR AC Plant and refixing after cleaning the same with petrol including replacement of bolts, nuts, gaskets all as specified and directed.

M&L for charging of refrigerant gas (R-22) in central AC plant 3x20TR capacity including provision of all T&P as required at sitecomplete all as specified & directed.

M&L for replacement of PVC fills of size 600mmx300mmx150mm.complete all as specified & directed.Make: - MIHIR/SUVIDHA/ AVIRATS.

Supply & Fixing in replacement sprinkler of cooling tower of central AC Plant of cap 3x20 TR of make as per site requirement or as per sample complete all as specified & directed.

Supply & Fixing in replacement CT fan blade for CT motor of cooling tower of central AC Plant of cap 3x20 TR of make as per site requirement or as per sample complete all as specified & directed.

Replacement of AHU Pre filter of 50 mm thick washable type with filter element made out of synthetic non woven media supported by HDPE mesh on both side including stitching in diamond pattern complete including frame and suitable for efficiency 90% down to 10 micron of make as per site requirement or as per sample ,in 3x20 TR central AC plant complete all as specified & directed.

Replacement of AHU secondary dry type cleanable and easlily maintainable air filter in 3x20 TR central AC plant, suported by GI wire and folder to form accordion plate having an efficiency of 95% down to 5 micron of make as per site requirement or as per sample.complete all as specified & directed.

Disconnecting and removing existing unserviceable interconnecting wiring and connections of electric control panels of Central AC Plants after thorough checking and inspections at site and material & labour for repairs of electric control panel & its interlocking system by using PVC insulated and unsheathed stranded copper conductor cable, single core,1.5 Sqmm size, 1100 Volts grade cable for making functional controls of the compressor, condenser water pump, Air handling unit, cooling tower fan, LP/HP/Differential oil, pressure switch, solenoid valve, capacity control valve, thermostat, humidistat, heater, auxiliary contactor, push buttons, indicator, amps meter, volt meter complete as required at site for functioning of central AC plant, all as specified and directed by Engineer-in-Charge. Note :- i) Disconnecting, Taking down and replacement of defective/unserviceable parts/spares/ accessories with new one & its connection shall be measured and paid for separately under appropriate item of Schedule `A' here-in-after.

Material and labour for servicing indoor/outdoor unit/de-scaling and cleaning of chocked pipes of water circulating lines including service valves, by de-scaling solution (concentrated hydrochloric acid) mixed with water in suitable proportion till the complete deposits/scale is removed but min 24 hours whichever is later & as ordered, circulating through pump, servicing of valves, cleaning with suitable size of drill rod, wire brush including dismantling and connecting all dismantled components in proper position after servicing/ overhauling/greasing etc. replacement of existing packing gasket , nuts, bolts with washer, testing of water line for leakage, complete all as specified and directed by Engineer-in-Charge for 3x11TR AC plant. Note: Servicing of complete indoor/outdoor unit/de-scaling of condenser will be consider as one job.

M&L for carrying out pressure leak test by nitrogen gas of the system of 3x11 TR AC plant for leak proof valve joints, seal & other connected contracts etc. including identifying and rectifying of leakage (if any) and maintaining constant pressure of 160 PSI on lower side and 300 PSI on higher side for 24 hours, complete all as directed by EIC. Note : T&P and nitrogen gas shall be arranged by the contractor at his own cost.

Replacement of AHU pre filter as per existing sample, efficiency -90% down to micron, in 3x 11TR AC plant complete all as directed.

M&L for replacement of compressor oil for AC plant complete all as directed.Make: HPCL,Indial Oil, Servo-Friz

M&L for replacement of control solenoid valve for central AC plant complete all as directed

Dismantling the burnt Squarrel cage induction motor of capacity 25 HP (Make of motor: kirloskar/ Ser Nos T6LAA4811,T7AAA4836 ) and rewinding motor by using super enamelled copper winding wire of same gauge as existing and replacement of gun metal bush, bearing,other worn out/unsv part if necessary and refitting the same, testing and commissioning as per the entire satisfaction of Engr-in-Charge.

Dismantling the burnt condenser pump motor (Make of motor: Kirloskar) of capacity 5 HP and rewinding motor by using super enamelled copper winding wire of same gauge as existing and replacement of gun metal bush, bearing,other worn out/unsv part if required and refitting the same, testing and commissioning as per the entire satisfaction of Engr-in-Charge.

Dismantling the burnt cooling tower motor (Make of motor: Kirloskar) of capacity 3 HP and rewinding motor by using super enamelled copper winding wire of same gauge as existing and replacement of gun metal bush, bearing,other worn out/unsv part if necessary and refitting the same, testing and commissioning as per the entire satisfaction of Engr-in-Charge.

Supply and fixing of pump impeller suitable for 3 HP pump or as per sample.

Supply and fixing of pump impeller for 5 HP pump or as per sample.

Supply and fixing of pump impeller 7.5 HP pump or as per sample.

Dismantling of the expansion valve and servicing the same thoroughly & refixing the same in existing position.

Dismantling the burnt motor (Make of motor: Kirloskar) of capacity 7.5/10 HP and rewinding motor by using super enamelled copper winding wire of same gauge as existing and replacement of gun metal bush, bearing,other worn out/unsv part if necessary and refitting the same, testing and commissioning as per the entire satisfaction of Engr-in-Charge.

M&L for replacement of V belt B-98. Make : DUNLOP / Fenner.

S&F in repair u/s HP / LP cut off switch as per existing capacity and make : Danfoss or equivalent.

All as per item No. 45here-in-before but oil pressure cut off switch.

All as per item No. 45 here-in-before but humidity control switch.

All as per item No. 45 here-in-before but differential temperature thermostat switch with capillary sense. Make :- Honey well/Reco or equivalent

M&L for replacement of Shaft seal assembly for 20 TR compressor make:- VOLTAS.

M&L for replacement of V fan belt A-62. Make : DUNLOP / Fenner.

S&F Electronic timer for star-delta starter of series ETR 550. Make : L&T/Havells

M&L for maintenance / repair, testing and commissioning of open type reciprocating compressor 20 ton capacity including dismantling and disconnecting suction and discharge refrigerant lines, other controls and accessories, loading transporting for repairs to contractor's workshop, replacement / renewal of minor items not covered in the succeeding items but essentially required for completion of the job e.g. gasket kits, cut washers, valve springs, castle nuts etc. and returning back to plant room after necessary repairs and re-installation in its position, all as specified and directed. Note : Items required for replacement of worn out parts will be measured and paid separately under respective items here-in-after.

Supply only for replacement of the following spare parts of compressor 20 ton :-

Pump end cover bush

Seal end bearing

Connecting rod bearings

Compressor rings

Compressor oil rings

Gasket set

SV Disk

DV Disk

SV Spring

DV Spring

Oil seal assembly

Connecting rod

Piston pin

Seal end bearing washer

Seal end thrust washer

Pump end bearing washer

Valve lifter pin

Valve lifter spring

Seal cover plate

Lock ring

Felt filter

Nyloc nut

Oil pump package

Service valves

Cylinder sleeve

Piston

Ball Bearing (bearing No 6311)

Disconnecting unserviceable contactor and Supply, fixing & testing complete contactor ML-1/ML-1.5 type, three pole power contactor with 2 NO + 2 NC auxiliary contacts for AC circuit with AC coil voltage 220 Volts grade, 50 Hz having current rating (AC3) of 25 Amps at 415 Volts, 50 Hz. Make : L&T cat part No. SS91851 or equivalent )

Disconnecting unserviceable contactor and Supply, fixing & testing complete contactor ML-2 type, three pole power contactor with 2 NO + 2 NC auxiliary contacts for AC circuit having current rating (AC3) of 32 Amps at 415 Volts, 50 Hz. confirming to IS/IEC 60947-4-1. Make : L&T Cat Part No SS90701 or equivalent in BCH, Siemens.

Supply and fixing in replacement strip heater element SP 220 V 50 Hz of 3 KW cap of length from 1.5 to 2.0 ft and as per site requirement including wiring and connection complete all as specified and directed. Make :- DASSPASS/RECOLD

M & L for replacement of U/S thermal over load relay of various ranges as per existing make and model starting from 9 Amps to 42 Amps complete all as specified & directed.

M & L for replacement of U/S single phase preventer, auxiliary volts 415 volts complete all as specified & directed.

DUWELL CONTROL PANELS

FUTURE Inc.