REPAIR REWINDING OF CENTRAL AC PLANT IN ZONE J AT MIL STN AGARTALA

Amount

Material and labour for vacuuming complete system of central air conditioning plant at Signal Centre (2X12TR) with double stage vacuum pump of (-) 2Kg/cm² vacuum pressure after repairs to compressor or repair in refrigeration system, charging the dry nitrogen gas, and hold up to 24 hrs and rectifing the leakage if any by repairing the "O" ring and gland packing of service valve/ Oil seal including top up the compressor oil and charging R-22 the gas all as specified and directed by Eng-in-charge. Note :- Referigerant Gas R-22, Nitrogen gas and compressor oil will be measured and paid separately as supply only rates under relevant Items.Once charged the R - 22 gas it should hold in the system minimum six month, if the gas leaked from the system the contractor has to charged gas at his own cost.

Supply only of refrigerant gas R- 22 including testing against leakage complete all as directed.

Supply only of nitrogen gas for leak testing of central A/C plant system complete all as directed.

Material and labour for opening of foundations, nuts, bolts coupling and transportation of unserviceable mono block pump/centrifugal & motor, 5 HP, 3 phase, 415 volts, 50 Hz, 2880 RPM( Make: Jyoti Ltd.) up to repair workshop, dismantling all parts of pumps, motor, carryout repair work , re-assembling the mono block pump & motor, re-transportation and re-installation at its original location and testing for proper functioning all as specified and directed. NOTE : (a) Major spare parts required for repair shall be measured and paid separately as supply only. (b) Rewinding of motor will be measured and paid separately.

Material & labour for re-winding of induction motor, 5 HP by super enamelled insulated copper wire of existing gauge with same number of turns, providing insulated paper into the slots, varnishing and backing of winding complete all as specified and directed.

Supply only sealed ball bearing of existing size suitable to house into the existing housing of mono block pump

Supply only cooling fan made out of good quality plastic of existing size, suitable for existing mono block pump and motor

Supply only impeller made out of gunmetal, mixed flow pattern type suitable for existing mono block pump and motor

Supply only key impeller suitable for existing mono block pump and motor

Material and labour for opening of foundation nuts, bolts and removal of induction motor 10 HP, 3 phase, 415 volts, 50 Hz, 1450 RPM, from AHU, transportation to workshop, dismantling all parts, carryout repair work re-assembling the motor, re-transportation and install in the same position where directed including making necessary electrical connection complete, testing and commissioning upto the entire satisfaction of Engr-in Charge. NOTE : Rewinding of motor will be measured and paid separately.

Material & labour for re-winding of induction motor of 10 HP by super enamelled copper wire of existing gauge with existing number of turn in each phase, providing insulated paper in slots, varnishing and backing of winding complete all as specified and as directed.

De-watering of water collecting chamber of cooling tower 24 TR capacity and taking out of PVC fins (filters of cooling towers) and water sprinklers, carryout cleaning of each fins by pressure water, removing the rusted/dust layers for opening of ducts of fins, cleaning of water collecting chamber, segregating worn out PVC fins, re-assembling the serviceable fins, water sprinklers etc.and carryout testing for proper functioning all as specified and directed. Notes: (i)The cleaning be carried out once in three months. (ii) The worn out PVC fins or sprinklers will be replaced by new PVC fins and sprinklers which will be measured and paid separately as supply only under serial item No-7.01 & 7.02 here in after.

Supply only PVC fins of existing size as per sample suitable for 24 TR cooling tower as approved by AGE (I).

Supply only water sprinklers of existing size suitable for existing cooling tower as approved by AGE (I).

Supply, hoisting and fixing in proper position ISI marked three layered rotational moulded polyethylene water storage tank (cylindrical vertical with closed top), of capacity 1000 litres with and including 20mm bore PTMT float and ball valve set including providing necessary connections after disconnecting and dismantling of existing PVC tank complete all as specified and as directed by the Engr-in-Charge.

Removing end caps of tube type condenser 2 x 12 TR capacity by opening or cutting of nuts & bolts,etc, and Material & labour for de-scaling of condenser units by using wire brush and scaling dilution solution (Coil Shine in the ratio 1:3 i.e. one percent Coil Shine and three % of water), reassembling of end caps, etc. and testing against leakage for proper functioning complete all as specified and as directed. Notes: The de-scaling of condenser units be carried out once in three months.

Dismantling of unserviceable induction motor of 2 HP from the top of cooling tower, 3 phase, 415 Volt, 930 rpm having long shaft for getting coupled with fan blade assembly, transporting the same upto repair workshop, carryout repair work, re-assembling all parts and fitting at the top of cooling tower and testing for smooth functioning complete all as specified and as directed NOTE : Rewinding of motor will be measured and paid separately.

Material & labour for re-winding of induction motor, 2 HP by super enamelled insulated copper wire of existing gauge with same number of turns, providing insulated paper into the slots, varnishing and backing of winding complete all as specified and directed.

Supply and fixing brass NRV of size 35 mm bore complete all as specified and as directed.

Material and labour for painting the following machines and equipment of the AC plant with two coats of synthetic enemal paint to match with the existing after cleaning the body and old rusted paint complete all as directed. (a) Condenser unit - 02 Nos (b) AHU - 01 No (c) Cooling tower - 01 No (d) Compresser - 02 Nos

Material and labour for preparation of old decorated surface of steel and iron and applying one coat of synthetic enamel paint, first quality, to monoblock/ Centrifugal pump and motor of 2HP / 5 HP capacity after removing of old paint by rubbing emery paper/wire brush complete all as specified and directed.

Taking down, dismantling and opening of the compressor of capacity 12 TR for over hauling, cleaning, washing, machining and mechanical repair work etc. Checking of its all parts for serviceability/unserviceability and reassembling all serviceable parts all as per original, and replacement of defective parts as required for smooth functioning of the compressor and testing after erection in original position to the entire satisfaction of Engineer-in-charge complete all as specified and as directed by Engineer-in-charge. Note :- Gas charging, gas and compressor oil shall be measured and paid separately.

Supply only compressor oil suitable for existing compressor complete all as directed by Engineer-in-Charge.

Supply and fixing in replacement of copper pipe of refrigrant up to size 19mm bore complete all as directed by Engineer-in-Charge.

Supply and fixing in replacement of copper pipe of refrigrant up to size 35 mm bore complete all as directed by Engineer-in-Charge.

Supply and fixing in replacement of heating coil of 1.5 KW (to supply hot air in winter) complete all as directed by Engineer-in-Charge.

Supply and fixing in replacement of gun metal globe /gale valve of 19mm bore complete all as directed by Engineer-in-Charge.

Supply and fixing in replacement of gun metal globe /gale valve of 35mm bore complete all as directed by Engineer-in-Charge.

Supply and fixing in replacement of safety valve suitable for compressor complete all as directed by Engineer-in-Charge.

Supply and fixing in replacement of safety valve for condenser complete all as directed by Engineer-in-Charge.

M&L for replacement of pressure gauge 4" dia suitable for refrigerent R-22 including provision of copper pipe 35 mm bore, 80 cm Long with flair nuts/adapter at both ends,range of gauge (-)30 to 300 Psi complete all as directed by Engineer-in-Charge.

Supply and fixing in repair of pressure gauge range 0-10 kg/cm2 with PSI bottom entry complete all as directed by Engineer-in Charge.

Supply and fixing in repair of thermometer temp range 0 to 100 degree cetingrade complete all as directed by Engineer-in Charge.

Supply and fixing in repair of pressure relief valve for condensor 10 mm BSP threaded suitable for 300 PSI complete all as directed by Engineer-in Charge.

Complete rewiring and repair of AC LT Panel and starter installed for operation of AC Plant with suitable size of copper wire along with suitable size of lugs, bolts, nuts and washers complete all as directed by Engineer-in Charge. Note-Major spare parts required for repair shall be measured and paid separately as supply only

Supply only MCCB, 160 Amps, TP having braking capacity 16 KA, 415 Volt 'C' Curve complete all as directed by Engr-in-Charge.

Supply only start push button green complete all as directed by Engineer-in-Charge.

Supply only stop push button red complete all as directed by Engineer-in-Charge. .

Supply only motor ON indicating light green complete all as directed by Engineer-in-Charge.

Supply only motor trip indicating light yellow complete all as directed by Engineer-in-Charge.

Supply only contactor of capacity 20 Amp complete all as directed by Engineer-in-Charge.

Supply only thermal over load relay 0 to 32 Amp complete all as directed by Engineer-in-Charge.

Supply only time delay relay range 30 to 120 sec. complete all as directed by Engineer-in-Charge.

Supply only single phase preventer 415 volts complete all as directed by Engineer-in-Charge.

Materials and labour for earthing complete with galvanised iron earth plate electrode 600 mm x 600 mm x 6 mm thick, burried directly and preferably vertically in ground, earth pit not less than 2.25 Mtr deep below ground level with top edge of the plate not less than 1.5 m below ground level connetced with galvanised strip 25x4mm by means of nuts, bolts, check nuts and washers made of galvanised iron or steel earthing lead to be protected by galvanised iron pipe of 32mm bore (light grade) and other end connected to earthing test point or lightening arrestor or main controlling switch as directed including providing funnel with 20mm bore galvanised iron pipe (medium grade), wire mesh, charcoal or coke and common salt in alternate layer of 15cm (compacted thickness) all round the earth electrode, concrete earth pit in PCC (1:3:6) type C-1 (with 20mm graded aggregate), 50mm thick precast RCC (1:2:4) cover slab (re-inforced with 8mm dia TMT bar @ 15 cm C/C bothways and suitable handle made of 10mm dia) including necessary earth work in excavation, returning filling and removal of surplus earth upto a distance not exceeding 50 m etc all as shown on electrical plate No. 3 of MES Schedule Part-I(2009) including taking down old unserviceable GI plate and strip complete including testing on completion including testing on completion including taking out unserviceable earthing plate and accessories all as specified and as directed. (Note: The rate Earth strip upto 7.50 metere from earth plate shall be deemed to be included in quoted rate.)

Supply and connecting flat, water proof, PVC insulated, 4 Sqmm, PVC sheathed, 3 core, 1100 volt grade, multi stranded copper conductor cable, confirming to IS-694/1990 including taking down existing cable complete all as specified and as directed.

Servicing of air handling unit by removing prefilter and micron air filter, cleaning/washing the filter and reassembling including minor repair rectification of exhaust system, heating coil, cooling coil, heating / cooling recovery system, air filter chambers, sound attenuators, mixing chamber and dampers complete all as specified and directed. Notes: (i)The cleaning be carried out once in three months. (ii) Major spare parts required for repair shall be measured and paid separately as supply only.

Supply only air dampers as per existing size suitable for 24 TR AC plant complete all as specified and as directed.

Supply of AHU filter made of wire mesh for air filteration upto 15 microns suitable for 24 TR AC plant complete all as specified and as directed.

Supply only of cooling coil of exisiting size complete all as specified and as directed.

Supply only AHU blower motor belt of existing size complete all as specified and directed.

Supply only dryer of existing size complete all as specified and directed.

Supply only thermostate of existing size complete all as specified and directed.

Supply only expansion valve of exisiting size complete all as specified and as directed.

Supply and fix in replacement air diffusers of existing size complete all as specified and directed by Engr In Charge

S & F GI Sheet of 22/24 Gauge with TDF Flange as in Rectangular / Square Duct made out of 'L' shaped hollow profile, duly factory boxed, including all accessories such as corner, cleat, carriage bolt, gasket and appropriate sealant on longitudinal joints etc. including fabrication and erection complete all as specified and as directed.

M & L for Under Deck Insulation for metal roof with resin bonded fibre glass wool of density 24 Kg / Cu.m, 25 mm thick, suitably factory laminated with aluminium foil backed up by scrim and kraft paper packing with 50 mm projection for overlap and butting including 22 SWG GI Wire support for insulation complete all as specified and as directed: Note- Insulating material shall conform to BS-476, Part 4, 5, 6 & 7.

S & F GI water tubing of 50 mm bore, medium grade conforming to IS – 1239 [Part – 1] including all fittings such as bends, tees, short pieces, connectors, elbows, reducers, union, sockets etc fixed to walls, ceiling or laid on floors including testing including taking down of existing unserviceable GI tubing complete all as specified and as directed.

S & F GI water tubing of 63 mm bore, medium grade conforming to IS – 1239 [Part – 1] including all fittings such as bends, tees, short pieces, connectors, elbows, reducers, union, sockets etc fixed to walls, ceiling or laid on floors including testing including taking down of existing unserviceable GI tubing complete all as specified and as directed.

S & F GI water tubing of 40 mm bore, medium grade conforming to IS – 1239 [Part – 1] including all fittings such as bends, tees, short pieces, connectors, elbows, reducers, union, sockets etc fixed to walls, ceiling or laid on floors including testing including taking down of existing unserviceable GI tubing complete all as specified and as directed.

S & F in repairs Gun Metal Globe or Gate Valve of Class - I, Pressure Tested of 1.5 Mpa, 50 mm bore with iron wheel head, screwed both ends for iron pipe, conforming to IS, ISI Marked complete all specified and as directed.

S & F in repairs Gun Metal Globe or Gate Valve of Class - I, Pressure Tested of 1.5 Mpa, 63 mm bore with iron wheel head, screwed both ends for iron pipe, conforming to IS, ISI Marked complete all specified and as directed.

S & F in repairs Gun Metal Globe or Gate Valve of Class - I, Pressure Tested of 1.5 Mpa, 40 mm bore with iron wheel head, screwed both ends for iron pipe, conforming to IS, ISI Marked complete all specified and as directed.

S & F 32mm outer dia of pipe, 3–layer PP–R Polypropylene random copolymer] concealed pipes of SDR 7.4 [PN–16] UV stabilised and anti microbial fusion welded having thermal stability for hot & cold water supply including all PP-R plain & brass threaded polypropylene random fittings complete to walls, ceilings or in floors etc. including testing including taking down of existing unserviceable pipes complete all as specified and as directed.

S & F in repair PP-R Gate Valves [Brass Insert] suitable for 32mm outer dia complete all as specified and as directed.

Material & labour for minor leak repairs in copper tubes of various size with brazing, cleaning / flushing, checking any leakage and make good including testing at 300 PSI complete all as specified and as directed.

M/S SEWAK SINGH