MAINTENANCE AND REPLACEMENT OF UNSERVICEABLE SPARES OF UPTO 30TR CENTRAL AC PLANTS INCLUDING CERTAIN MISC WORKS AT NAVAL DOCKYARD VISAKHAPATNAM UNDER GE (I) (DM) VISAKHAPATNAM

Amount

Repairs, overhauling and servicing of following AC Plant compressor by stripping out both end covers, cylinder head, cylinders, connecting rod, crank shaft, oil pump, side covers, bush bearings etc.,and refrigerant taking the cylinder for reuse (if available) of unserviceable worn out parts in the compressor, cleaning the system with CO2/Nitrogen gas for leak detection for minimum 24 Hrs, after flushing out the system, vacuumization and charging with refrigerant gas & compressor oil and testing the unit on no load and full load conditions all as specified and directed. Note:- Supply only refrigerant gas, compressor oil and spare parts for the compressors will be measured and paid under relevant items of Schedule ’A’.

SMC 6-65 of Make ‘Accel’ 20TR

5F-20 of Make ‘Carrier’ 15TR

Supply only following spare parts suitable for SMC 6-65 of 'ACCEL' make

Bushing with collar standard

Shaft seal assembly

Bearing bushing

Gear wheel

Single frame (unload -65)

Rocker for unload mechanism

Bearing cup

Spring holder

Spring

Cup washer

Crank shaft

Half section of bearing standard

Bush for piston pin

Castie nut

Split pin

Piston with pin & rings

Cylinder liner

Unloading ring with pin

Tension spiral

Suction valve ring plate

Valve spring

Suction valve retaining plate

Discharge valve seat

Discharge valve ring plate

Oil pressure regulating valve

Safety valve assembly

Set of gasket

Set of neoprene “O” Ring

Set of dowty rings

Set of sealing rings

Supply only following spare parts suitable for 5F-20 of Make ‘Carrier’ 15TR

Crank shaft

Connecting rod

Piston

Piston pin

Piston lock

Suction reed

Discharge reed

Suction valve springs

Discharge valve springs

Discharge valve assembly

Valve plate

Spring lifter pin

Gasket set

Collecing rod bearings

Oil pump assembly with bush

Shaft seal assebly

Pump end bearing

Seal end bearing

Thrust washer

Cylinder liner

Piston ring and oil ring

Supply only R-22 gas. Make:-Refron 22/Floron 22/Mafron 22

Supply only compressor oil. Make:-Servo/N-68 of HPCL

Material and labour for descaling of 10 TR to 25 TR condensers by using HCL acid with continuous circulation method using circulation pump, finally neutralizing with fresh water, opening both end covers of shell and tube condensers, cleaning of copper tubes manually by using nylon brushes, re-fixing the end covers with new neoprene rubber gaskets, commissioning after complete performance test of the system all as specified and directed.

Material and labour for checking the complete refrigeration system of the AC plant of capacity 10 - 30 TR, leak testing with CO2 gas under constant pressure of 250 PSI after complete transfer of refrigerant gas from the entire system, rectification of leakages including cutting and brazing the refrigeration pipes wherever required, replacement of "O" rings, teflon washers of valves, copper tubing, flare nuts etc., neutralizing after the pressure hold good for at least 24 hours vacuumization of system, testing and commissioning of air conditioning plants: Note : Refrigerant gas shall be measured and paid separately

Material labour for taking out defective shaft seal assembly, supply and fix new shaft seal assembly suitable for the following capacities of compressors all as specified and directed:

SMC 6-65 ‘Accel’ make compressor

610-18-00 SMC 4-65 ‘Accel’ make compressor

Material and labour for preparation of surfaces by scrapping and removing rusted portion with wire brush and applying one coat of synthetic enamel paint for complete refrigeration system, in-let/out-let pipe lines, compressor unit, condenser pump set, control LT panel board duct covers, cooling tower stand including lettering & numbering and applying one coat of white/colour wash to chiller pipe line all as specified and directed

Material and labour for complete checking, servicing/ rectification of electrical circuits for all units and control wiring showing phase sequence with proper lugging of AC plant control panel including replacement of fused indication lamps with new ones, cleaning of all power contacts, rectification of minor defects in Ammeters and Voltmeters, testing and commissioning all as specified and directed. Note :- Material such as indication lamp, ammeter, voltmeter shall be measured and paid separately.

Material and labour for replacement of suction reeds, discharge reeds, piston rings, oil rings and replacement of gaskets complete all as specified and directed by Engr-in-Charge. Note : - Refrigerant gas charging/ Pressure testing shall be measured and paid separately under relevant items of Schedule ’A’.

Supply and fix pressure gauge for suction/discharge refrigerant lines and water lines of square/round type 2"/4" dial for the following ranges for Package/Central type AC plants including taking down old unserviceable pressure gauge complete all as specified directed Make -Air Master/Febig/Scientific

0-150 PSI for refrigerant line

0-300 PSI for refrigerant line

0-12 Kg./cm2 for water line

Material and labour for taking out the following defective pressure cut-outs of any range and model and supply & fix new pressure cut-outs, connecting the pressure lines / control wiring, leak testing and commissioning all as specified and directed Make:-Indofoss/Danfoss/Ranco

HP/LP pressure cut-out MP-15

Oil pressure cut-out MP-55

S&F for VVE-70 model expansion valve of Sporlon make with necessary modification, brazing, lead testing and commissioning including taking out old unsv expansion valve complete all as specified and directed.

All as per item No. 14.00 above but for VVE- 52

All as per item No. 14.00 above but for VVE- 16

All as per item No. 14.00 above but for VVE- 20

Material and labour for monthly cleaning of entire indoor substation buildings inside wall, ceiling, floor and outside wall, plinth protection with suitable brush/broom/wiper, removing wild vegitation around substation building complete all as specified and directed.

Supply only indication lamps (LED type) red, yellow and blue in colours of 22.5 mm dia to monitor on LT panel board suitable for 240 V AC supply and taking down unserviceable indication lamps all as specified and directed. Make:- Siemens/C&S/schneider/ABB

Taking down existing corroded/ unserviceable portion of MS flat/angle iron supports/ channels of various sizes fitted in electrical panels in AC plants and supply & fix MS flat/ angle iron including necessary bolting/ welding etc., all as as specified and directed.

Supply and fix suction, discharge valves seatings, copper lines, angle valves of suitable sizes required for suction, discharge, oil pressure and cutouts suitable for 10 TR to 25 TR complete including necessary removal, recharging of refrigerant gas and nitrogen testing all as specified and directed.

Supply and fix in repairs pilot solenoid valve to the refrigerant system, reconnecting the refrigeration piping including leak testing, brazing/flaring to the pipe line whererever required all as specified and directed. Make :- Sporlon/Donfos

Supply and fix in repairs loading solenoid valve to the refrigerant system, reconnecting the refrigeration piping including leak testing, brazing/flaring to the pipe line whererever required all as specified and directed. Make :- Sporlon/Donfos

Supply & fix HMI display board with micro processor controller touch pad for 26 TR ductable AC plant (Model No : - 30RBS80S Make - Carrier) including taking out old unserviceable one complete all as specified and directed.

Supply & fix NRCP board for 26 TR ductable AC plant (Model No. CEBD 430335 - 16 - RB, Make : - Carrier) including taking out old unserviceable one complete all as specified and directed.

Supply & fix EXV board suitable for 26 TR ductable AC plant (Make - Carrier ) including taking out old unserviceable one complete all as specified and directed.

Supply & fix suction gas temperature tranduger (LP) for 26 TR ductable AC plant (Make - Carrier) including taking down unserviceable complete all as specified and directed.

Supply & fix discharge gas temperature tranduger (HP) for 26 TR ductable AC plant (Make - Carrier) including taking down unserviceable complete all as specified and directed.

Supply & fix entering/leaving water temperature sensor for 26 TR ductable AC plant (Make - Carrier) including taking down unserviceable one complete all as specified and directed.

Supply & fix outside temperature sensor for 26 TR ductable AC plant (Make - Carrier) including taking down unserviceable one complete all as specified and directed.

Supply & fix HP switch for 26 TR ductable AC plant (Make - Carrier) including taking down unserviceable one complete all as specified and directed.

Supply & fix LP switch for 26 TR ductable AC plant (Make - Carrier) including taking down unserviceable one complete all as specified and directed.

Supply & fix sub cooler sensor for 26 TR ductable AC plant (Make - Carrier) including taking down unserviceable one complete all as specified and directed.

Supply & fix electronic expansion valave suitable for 26 TR ductable AC plant (Make - Carrier) including taking down unserviceable one including charging/dishcharging of refrigerant gas alongwith necessary brazing work and pressure testing complete all as specified and directed

Material and labour for repair/maintenance of 26 TR ductable AC plant by leak testing with N - 2 gas under constant pressure of 250 PSI (17 Kg/cm2) after complete transfer of refrigerant gas from the entire system, rectification of leakage by cutting and brazing the refrigeration system wherever required, replacement of 'O' rings, teflon washers of valves, copper tubing, safety valves, flare nuts etc. neutralising after the pressure holds, good for atleast 24 hours, vaccumization, charging the system with refrigerant gas, performance test and commissioning complete all as specified and directed. Note : - Gas charging shall be measured and paid separately)

Material & labour for 26 TR ductable AC plant complete checking, servicing / rectification of electrial circuits for all units and control wiring showing phase sequence with proper lugging of AC plant control panel including replacement of fused indication lamps with new ones, cleaning of all power contacts, rectification of minor defects in Ammeter and Voltmeters, testing and commissioning complete all as specified and as directed.

Material and labour for replacement of suction lines, oil pressure lines, HP/LP lines and cut out lines with existing size copper tubing including necessary brazing, flaring alongwith pumping down, and recharging after complete replacement of copper tubing, neutralizing after the pressure hold good for at least 24 hours vacuumization of system, testing and commissioning of air conditioning plants. Note : - Refrigerant gas shall be measured and paid for separately as supply only and pressure testing by replacing old flare nuts complete.

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