REPAIRS / MAINTENANCE OF CENTRAL TYPE AC PLANT AT MH AND OTA CHENNAI UNDER GE STM

M&L for descaling of condensor unit and connected pipe lines of 2 x 75 TR capacity central AC plant installed at Auditorium by circulating dilute hydrochloric acid solution and cleaning the tube throughly with wire brush by removing the side cover and recirculating the fresh water after fixing the side cover with necessary gasket and bolts and nuts complete all as specified and as directed.

M&L for descaling of condensor unit and connected pipe lines of 3x 100 TR capacity central AC plant installed at GITC & Library by circulating dilute hydrochloric acid solution and cleaning the tube throughly with wire brush by removing the side cover and recirculating the fresh water after fixing the side cover with necessary gasket and bolts and nuts complete all as specified and as directed.

M&L for descaling of condensor unit and connected pipe lines of 3x 120 TR capacity central AC plant installed at MH & GC Mess by circulating dilute hydrochloric acid solution and cleaning the tube throughly with wire brush by removing the side cover and recirculating the fresh water after fixing the side cover with necessary gasket and bolts and nuts complete all as specified and as directed.

M&L for checking the leakages of entire refrigerant system like flare joints, valve glands using leak detection devices and soap solution and halide torch or electronic leak detector and arresting the leaks by welding, bracing works, binding with teflon tape as required at site and topping up the gas for required suction and discharge pressure of central AC plant 75 TR / 100 TR / 120 TR capacity complete all as specified and as directed. NOTE: Refrigerant gas shall be measured and paid separately under relevant item as a supply only.

M&L for vacuumising of central AC plant 75 TR / 100 TR / 120 TR capacity by using vacuum pump upto - 30 PSIG pressure and hold the same vacuum pressure upto 24 hours including necessary welding and bracing if required complete all as specified and as directed.

M&L for Leakage testing of central AC plant 75 TR / 100 TR / 120 TR capacity by using vacuum pump upto 300 PSIG pressure and hold the same vacuum pressure upto 24 hours including necessary welding and bracing if required complete all as specified and as directed.

M&L for dismantling of water cooled / air cooled central AC plant compressor upto 120 TR capacity, to clear the choked lines, overhauling of the same, arresting the leakages with necessary required welding / soldering, as required at site, and replacing the gasket and refixing back to the same in originl position and testing complete all as specified and as directed by Engineer-in-Charge.

M&L for dismantling of water cooled / air cooled package type compressor upto 5.5 TR capacity, to clear the choked lines, overhauling of the same, arresting the leakages with necessary required welding / soldering, as required at site, and replacing the gasket and refixing back to the same in originl position and testing complete all as specified and as directed by Engineer-in-Charge.

S & F in replacement of 12 set of bearing with gasket suitable for screw compressor 120 TR capacity complete all as specified and as directed.

Supply and charging / topping up the refrigerant gas R-22 into the system and testing as per standard procedure of central AC plant 75 TR / 120 TR capacity complete all as specified and as directed.

Supply and charging / topping up the refrigerant gas R-134A into the system and testing as per standard procedure of central AC plant 100 TR capacity complete all as specified and as directed.

S & F in repairs Gun metal nozzle of suitable size for cooling towers of capacity 240 TR / 200 TR / 150 TR complete all as specified and as directed.

S & F in repairs Filter set of three 75 C for drier of existing make, suitable size for central AC plant 75 TR / 120 TR capacity complete all as specified and as directed.

S & F in repairs Water pressure cut out type of existing make of suitable size, 250 Volts, AC, 15 Amps complete all as specified and as directed.

M&L for cleaning the compressor unit after draining out old compressor oil, overhauling / unloading system, refilling with new compressor oil to the required level including replacement of oil filter element and testing as per standard procedure complete all as specified and as directed.

S & F in repairs Actuator 3 way solenoid valve of existing make of suitable size complete all as specified and as directed.

S & F in repairs Pilot control valve with drier of existing make of suitable size complete all as specified and as directed.

S & F in repairs Low pressure, high pressure cut out of existing make of suitable size complete all as specified and as directed.

S & F in repairs Oil pressure cut out of existing make of suitable size complete all as specified and as directed.

S & F in repairs Industrial type pressure gauge with gun metal / brass valves adequately suppoted as per specifications complete all as specified and as directed.

S & F in repairs chilled Water NRV suitable for existing plant as per specifications as complete all as specified and as directed.

S & F temperature sensor/Transducer suitable for Central AC plant MCS -100 complete all as specified and as directed.

S&F pressure sensor/ Transmitor suitable for Central AC plant complete all as specified and as directed.

S&F digital Thermometer with Humdity meter specifications complete all as specified and as directed.

M&L for dismantling of cooling tower service panel, draining out water completely, cleaning of honey comb fills (drift eliminators), nozzles etc., by caustic soda and wire brush, cleaning of cooling tower tank by removing all algae from the basin, cleaning the GI pipes by removing the sediments, cleaning of sump suction filter - 01 No and pump side filter strainers - 2 Nos for cooling tower of capacity 240 TR complete all as specified and as directed.

M&L for dismantling of cooling tower service panel, draining out water completely, cleaning of haney comb fills (drift eliminators), nozzles etc., by caustic soda and wire brush, cleaning of cooling tower tank by removing all algae from the basin, cleaning the GI pipes by removing the sediments, cleaning of sump suction filter - 01 No and pump side filter strainers - 2 Nos for cooling tower of capacity 200 TR complete all as specified and as directed.

M&L for dismantling of cooling tower service panel, draining out water completely, cleaning of honey comb fills (drift eliminators), nozzles etc., by caustic soda and wire brush, cleaning of cooling tower tank by removing all algae from the basin, cleaning the GI pipes by removing the sediments, cleaning of sump suction filter - 01 No and pump side filter strainers - 2 Nos for cooling tower of capacity 75 TR complete all as specified and as directed.

M&L for dismantling of cooling tower service panel, draining out water completely, cleaning of honey comb fills (drift eliminators), nozzles etc., by caustic soda and wire brush, cleaning of cooling tower tank by removing all algae from the basin, cleaning the GI pipes by removing the sediments, cleaning of sump suction filter - 01 No and pump side filter strainers - 2 Nos for cooling tower of capacity 11 TR complete all as specified and as directed.

S & F in repairs PVC honey comb fills (drift eliminators) of suitable size for cooling tower of capacity 75 TR / 200 TR / 240 TR complete all as specified and as directed.

S & F in repairs Rectangular / round ducting, fabricated from GSS sheet metal, 24 gauge, including neoprene rubber gaskets, insulation of resin bonded glass wool 25mm thick, of density 32 kg / cum, 25mm x 25mm x 1.25mm, GI sections complete all as specified and as directed.

S & F in repairs Plain galvanised iron sheet, 24 gauge, inside of AHU including necessary welding / bracing complete all as specified and as directed.

M & L for Dismantling, overhauling AHU, assembling and testing completeall as specified here-in-after and as directed. Note:- (a) Inspection of absolute filters, remove and cleaning vacuum cleaners and refix back in place (b) Clean cooling coil, fins by using caustic soda and water pressure method, applying grease for all motors, check and adjust belt tension as required, check condition of blower shaft, scroll, impeller and bearings, check tightness of all electrical terminations, clear water line strainers, check proper balancing system, check for noise and vibration (c) Check healthy operation of controls and safety devices.

S & F SPA "V" belts suitable for AHUs of 150 TR, 200 TR and 240 TR capacity AC plants complete all as specified and as directed.

S & F in repairs Bearing suitable for AHU blower and motor for 75 TR / 200 TR / 240 TR capacity AC plants complete all as specified and as directed.

S & F in repairs Limit switch Type-LSR with diecast cover with roller lever for AHU door complete all as specified and as directed.

M & L for Servicing LT AC plant panel board of any size including connected AHU starter panels and wirings, cleaning of panel board internally and externally, tightening all screws and nuts and bolt, replacing minor parts like screws, washers, lugs etc, checking the serviceability of all switchgears complete all as specified and as directed. Note:- Switchgear if required during servicing shall be measured and paid separately under relevant item.

S&F in repairs Electronic timer 240 V, 50 Hz, 3-30 sec for star delta starter complete all as specified and as directed.

S&F in repairs MNX 18 W contactor assembly, AC - 3, 415 V, 16 Amps complete all as specified and as directed.

S & F in repairs MNX 25 W contactor assembly, AC - 3, 415 V, 25 Amps complete all as specified and as directed.

S & F in repairs MNX 40 W contactor assembly, AC - 3, 415 V, 40 Amps complete all as specified and as directed.

S & F in repairs Contactor combination (Relay) 2 NO + 2 NC, 415 V, 10 Amps complete all as specified and as directed.

S & F in repairs MCB 40 Amps, TPN, 415 Volts, 50 Hz, AC supply, "C" curve, with breaking capacity of 10 kA complete all as specified and as directed.

S & F in repairs the following MCCB's including studs and cable lugs in existing LT panel, with fixed thermal and fixed magnetic setting with protection for overload and short circuit and conforming to IEC60947 / IS 13947 (Pt-II) 1993 (Latest version) and with Ics = 75% of Icu having spreader links and barriers as standard feature of manufacturer fixing complete all as specified and directed. Make : Havells/Legrand/ABB/L&T

MCCB 100 Amps 16 KA, 3 Pole

MCCB 160 Amps 25 KA, 3 Pole

MCCB 200 Amps 25 KA, 3 Pole

MCCB 250 Amps 25 KA, 3 Pole

MCCB 400 Amps 36 KA, 4 Pole

S & F in repairs Standard universal LED indicators, of colour RYB complete all as specified and as directed.

S & F in repairs MCB, single pole, 6-32 A, 230 Volts, 10 kA, "C" series complete all as specified.

S & F in repairs MCB, triple pole, 6-32 A, 415 Volts, 10 kA, "C" series complete all as specified.

S & F in repairs Single phase preventor complete all as specified.

M & L for Disconnecting the pumpsets with motor or AHU blower motor from base plate and transporting from site to workshop for repairs and and return back to site, refixing the pump and motor on base plate, coupling the motor and pump as required, connecting the suction pipe and delivery pipe lines, connecting to electric supply etc. and testing and commissioning inclusive of providing new mild steel nuts and bolts as required complete all as specified and as directed. Note:- Repairs as required for the motors and pumps shall be measured and paid separately.

M & L for Dismantling mono block pump motor, rewinding with super enamelled copper winding of appropriate gauge and quality and insulated with varnish after removal of burnt out winding from slots with emery paper, including replacement of worn out bush, bearing, shaft metalling / grinding, reassembling and testing upto 20 HP capacity complete all as specified and as directed. Note:- Spares as required shall be measured and paid separately

M & L for Dismantling induction motor of AHU / cooling tower, rewinding with super enamelled copper winding of appropriate gauge and quality and insulated with varnish after removal of burnt out winding from slots with emery paper, including replacement of worn out bush, bearing, shaft metalling / grinding, reassembling and testing upto 15 HP capacity complete all as specified and as directed. Note:- Spares as required shall be measured and paid separately

M & L for Dismantling induction motor of AHU / cooling tower, rewinding with super enamelled copper winding of appropriate gauge and quality and insulated with varnish after removal of burnt out winding from slots with emery paper, including replacement of worn out bush, bearing, shaft metalling / grinding, reassembling and testing for 1.5 to 5 HP capacity complete all as specified and as directed. Note:- Spares as required shall be measured and paid separately

Supply only ball bearing as per existing complete all as specified and as directed.

Supply only bearing sleeve as per existing complete all as specified and as directed.

Supply only pulley bearing for AHU complete all as specified and as directed.

Supply only motor bearing for AHU complete all as specified and as directed.

Supply only mild steel metal shaft complete all as specified and as directed.

Supply only gasket suitable for any size and capacity complete all as specified and as directed.

Supply only cast iron impeller with nuts of suitable size complete all as specified and as directed.

Supply only gland rope (graphite rope) 1/4" size, 1/2" size and 3/4" size any capacity complete all as specified and as directed.

Supply only mild steel bolts, nuts and washers with suitable flange any size any capacity complete all as specified and as directed.

Supply only mild steel foundation bolts, nuts and washers with any size any capacity complete all as specified and as directed.

S & F in repairs Butterfly valve, wafer type, Class PN 1.6, with SG iron body and disc, suitable for 150mm bore of pipe with necessary fixing arrangements such as fasteners, nitriles or EDPM rubber lining, stainless steel pins, ring, bolts and nuts etc complete all as specified and as directed.

S & F in repairs GI Volume control dampers of 18 gauge including necessary gasket, nuts and bolts and accessories etc., as required complete all as specified and as directed.

S&F Canvas cloth on duct with provision of zips for both inlet and outlet of AHU complete all as specified and as directed.

S & F in repairs Balancing valve with built in measuring facility with cast iron body, Class PN 1.6 rating, flanged construction, with EDPM coated disc with long pitch protected out pipe insulation for chilled water circulation of size 100mm dia in the chilled / plumbing duly insulated to the same specifications as the connected pipeline and adequately supported as complete all as specified and as directed.

S & F in repairs Balancing valve with built in measuring facility with cast iron body, Class PN 1.6 rating, flanged construction, with EDPM coated disc with long pitch protected out pipe insulation for chilled water circulation of size 40mm dia in the chilled / plumbing duly insulated to the same specifications as the connected pipeline and adequately supported as complete all as specified and as directed.

M & L for Earthing complete with galvanised iron earth plate electrode 600mm X 600mm X minimum 6mm thick, with and including 32mm x 6mm GI strip protected by 40mm dia GI pipe light grade upto a length of 7.5m. The plate shall be buried directly in ground vertically to a depth not less than 2.25 metres below ground level with top edge of the earth plate at a depth not less than 1.5 metres below ground level, connected to earth lead as described here-in-before by means of bolts, nuts, washers and checknuts made out of galvanised iron or mild steel, earthing lead protected by as described here-in-before and connected to main switch board or main control board or electric pole all as shown on electrical plate No.3 of MES Sch Part-I including necessary earth work and excavation in any type of soil, plain cement concrete 1:3:6, type C1 chamber, reinforced cement concrete cover slab with locking arrangement and handle of 10mm dia MS round bars 450mm long, 1:2:4 type B1, 50mm thick with 8mm dia TMT bars at 140mm centre to centre both ways, GI pipe of bore 20mm medium grade for watering with funnel, wiremesh, salt, charcoal, lugs including testing complete all as specified and as directed.

M & L for Preparation of surface by removing dust, emery paper, tinkering, applying metal putty wherever necessary and painting with one coat of synthetic enamel paint of existing shade / colour on outer side of Chiller unit, Compressor unit of central AC plant 2 X 75 TR / 3 X 100 TR / 3 X 120 TR capacity complete all as specified and as directed.

M & L for Preparation of surface by removing dust, emery paper, tinkering, applying metal putty wherever necessary and painting with one coat of synthetic enamel paint of existing shade / colour of condensor pipe line, inlet and outlet (length upto cooling tower basin) and chiller pump pipe line inlet and outlet (length upto plant room wall) including marking and numbering complete all as specified and as directed.

M & L for preparation of surface by removing dust, emery paper, tinkering, applying metal putty wherever necessary and painting with two coats of synthetic enamel paint over a coat of red oxide zinc chrome primer of existing shade / colour on inner side and outer side of cooling tower of 75 TR / 200 TR / 240 TR capacity complete all as specified and as directed.

M & L for preparation of surface by removing dust, emery paper, tinkering, applying metal putty wherever necessary and painting with two coats of synthetic enamel paint existing shade / colour of mono block pumpset with motor / induction motor of AHU / cooling tower complete all as specified and as directed.

S & F in repairs Wire netting of galvanised steel wire 0.91mm dia, size of mesh 12mm fixed with tinned tacks of wire staples complete all as specified and as directed.

S & F rolled mild steel as in joists, channel, angle or tee sections, fixed independently, without connecting plates etc., (cut to ordinary lengths i.e within 20mm of the length indicated) of Fe-410-W (Gde E-250 quality A) complete all as specified and as directed.(For fixing AHU motor base and Duct support)

M & L for dismantling existing rusted /leakage duct & taken as shedule of credit and Supply, fabricating, installation, testing and commissioning of GI sheet metal ducting, Zinc coated complete with standard accessories, GI hardware, self adhesive elastomer foam gasket, support etc of 22 gauge as per IS 655 and particular specification complete all as specified. Note :- (a) The supports such as threaded roads, flanged joints braces, shall be galvanized as per IS655. (b) the items required for completion of ducting work have been considered above. However, if any items not mentioned above but required for smooth functioning and successful operation of duct shall be included into quoted rates of above items.

M&L for thermal insulation of duct using adhesives and FG crown-150 factory laminated covered with aluminium foil of 50 mm thickness complete all as specified.

S & F Fire Extinguisher Carbon dioxide (CO2) extinguishers consisting of welded M.S. cylindrical body, light weight squeeze lever discharge valve fitted with pressure indicating gauge with internal discharge tube, discharge nozzle suspension bracket of capacity 4.5 Kg as per IS: 2878 complete with holding accessories including taking down old unserviceable one complete all as specified & directed.

S & F Fire Extinguisher Carbon dioxide (CO2) extinguishers consisting of welded M.S. cylindrical body, light weight squeeze lever discharge valve fitted with pressure indicating gauge with internal discharge tube, discharge nozzle suspension bracket of capacity 6.0 Kg as per IS: 2878 complete with holding accessories including taking down old unserviceable one complete all as specified & directed.

S & F in replacement of HEPA Filter 0.6 micron of size 600X600X305mm box type, as per existing specifications complete all as specified and as directed.

S & F in replacement of PCB Display Board suitable for 120 TR capacity Bluestar Plant of auxillary supply 8V & 12 V as per specifications complete all as specified and as directed.

S & F in replacement of AHU Blower Set of fan pulley :106x 1 Spa of speed 1230 RPM and Motor pulley 90X 1Spa as per existing specifications complete all as specified and as directed.Make Zeco

S & F in replacement of AHU drier core as per exisitng specifications complete all as specified and as directed.

S & F in replacement of Temperature sensors complete all as specified and as directed.

S & F in replacement of current transducer complete all as specified and as directed.

S & F in replacement of pressure transducer complete all as specified and as directed.

S & F in replacement of EXV driver board complete all as specified and as directed.

S & F in replacement of Oil level sensor switch optical type complete all as specified and as directed.

S & F in replacement of Voltage protection relay complete all as specified and as directed.

S & F in replacement of Motor protector relay complete all as specified and as directed.

S & F in replacement of Condenser motor bearing complete all as specified and as directed.

S & F in replacement of compressor star delta timer complete all as specified and as directed.

S & F in replacement of compressor contactor 90A complete all as specified and as directed.

S & F in replacement of condenser motor contactor complete all as specified and as directed.

S & F in replacement of compressor oil heater complete all as specified and as directed.

S & F in replacement of solenoid coil for compressor complete all as specified and as directed.

Taking out PCB of Package type AC plant of capacity 5.5 TR Supply and fix new in replacement checking, adjusting and updating with software configuration complete all as specified and directed.

S & F in replacement refrigerant accumulator suitable for package type AC Plant complete all as specified and directed.

S & F in replacement drier Filter suitable for package type AC Plant complete all as specified and directed.

S & F in replacement of nozzle for cooling tower as per existing at the site complete all as specified and directed.

M&L for servicing of indoor and outdoor unit of package type AC plants including oiling greasing of fan motor replacement of synthetic filter & checking of electric circuit 22 TR capacity compressor for smooth functioning of complete circuit all as specified and directed.

Supply and providing acoustic insulation with open cell nitre rubber complete all as specified and as directed

Supply and installation of supply air & return air grills with SA dampers complete all as specified and as directed

S & F in replacement expansion valve as per site requirement suitable for 5.5 TR capacity package unit complete all as specified and directed.

S & F in replacement of scroll type compressor of capacity 5.5 TR capcity for package type AC plant complete all as specified and directed.

Supply, laying, jointing, welding & testing MS Pipe (Heavy duty class 'C') 6mm thick laid in trenches or on floors for connections to centrifugal pump sets for suction, pump to header and to connect out going water main CI/DI/MS pipe line in and including suitable flanges complete and taking down old unsv MS pipe any size complete all as directed by Engineer-in-Charge.

100 mm bore

150 mm bore

M & L for Taking down old feeder pillar box outdoor and supply, installation, testing and commissioning of LT Feeder pillar box suitable for 415V, 3 phase, 4 wire, 50 Hz AC supply, outdoor type factory made powder coated dust and vermin proof made out of 3.15 mm thick CRCA steel mounted on 50x50x6mm mild steel angle iron with water proof top canopy , ventilated side louvers, twin leaf doors at front and rear side with suitable locking arrangement, sheet steel enclosed bus bar chamber with door, cable entry detachable bottom plates erected on and including provision of PCC 1:3:6 type C1 (using 20mm graded stone aggregate) as in pedestals of suitable size, with and including the following complete all as specified and directed.:- Incoming:- (a) ON Load Change Over Switch 800A- 01No (b) 4 Pole ACB with Microprocessor Release (IPR 1+ ) -01 No

Attending the complaints of AC Plants due to non functioning of compressor, blower motor, chiller pump, CT fan, Electric panel and any other complaints of AC plant at any location, and rectified the same by deploying experienced AC Electrician / Technician / Mechanic with requisite tools and machineries as required for finding the faults auch as multimeter, tester, spanner, cutting blade, tapes etc. and rectify the compliants and make the Ac plant functionable in all respects complete all as specified and directed. Note :- (a) Complaints should be attended immediately within one hour and to be rectified on the same day or at the earliest without affecting services. If the contractor fails to repair and rectify the defects / complaints within the time limit as given by Engineer-in-Charge , penalty / recovery will be made from the contractor w.r.t contract provision, and further complaints shall be attended/repaired / rectified through other agency and necessary charges shall be recovered from the contractor. The decision of the Accepting officer in this regard shall be final concluding and binding on the contractor. (b) All spare parts as required for rectifying the complaints shall be measured and paid seperatly under relavant items. (c) Recttified complaints shall only be measured and paid under this item.

S & F in repairs Cast iron non return sluice valve suitable for 150 mm bore of pipe with flanged ends drilled with holes, Class PN 1.6 (conforming to IS 14846) with brass spindle and checknut, rubber gasket 3mm thick, nut, bolts and washers, necessary machining works complete all as specified and as directed.