REPAIRS AND PERIODICAL MAINTENANCE OF CERTAIN CENTRAL TYPE AC PLANTS AT AFA HYDERABAD

Amount

M&L for servicing/overhauling to Central type AC Plant for overhauling and servicing whole plant (ie chiller units), blowing out the dust, rectifying the minor problems, checking of interlock of safety/control device, checking of all electrical connections/fuse in unit & panel, checking refrigerant/ water pipe lines, cleaning of plant, servicing of chiller / condencer pumps, replacement gland packing in pumps, plant as per existing specification of the following capacities of Central type AC plants complete all as specified and as directed.

Air cooled, chilled water type 3 x 56 TR Capacity

Water cooled, chilled water type 3 x 37 TR Capacity

Air cooled, chilled water type 3 x 22.7 TR Capacity

Air cooled, chilled water type 3 x 24 TR Capacity

Air cooled, chilled water type 2 x 22 TR Capacity

Air cooled, chilled water type 3 x 22 TR Capacity

Water cooled chilled water type 3 x 20 TR Capacity

M&L for de-scaling the shell tube condenser and chiller water line complete upto AHU by circulating diluted hydrochloric acid (HCL) at the appropriate ratio depend upon the scale deposits till removal of all scale inside the copper tubes & shell of the condenser by forced feed method, removal of end covers, brushing with the nylon brush, removal of all scale and degreasing with caustic soda, flushing out thoroghly, refixing the end covers with new gasket packing and nuts and bolts, connecting the inlet/outlet water connection, checking of water leakage, testing all the following capacities of Central type AC plants complete all as specified and as directed. Note : All equipments such as pump set, pipes & chemical has to be arranged by contractor . No extra charge has to be paid by the department on that account.

Air cooled, chilled water type 3 x 56 TR Capacity

Water cooled, chilled water type 3 x 37 TR Capacity

Air cooled, chilled water type 3 x 22.7 TR Capacity

Air cooled, chilled water type 3 x 24 TR Capacity

Air cooled, chilled water type 2 x 22 TR Capacity

Air cooled, chilled water type 3 x 22 TR Capacity

Water cooled chilled water type 3 x 20 TR Capacity

M&L for leak testing of the total refrigerant system of AC plants by pumping down the refrigerant to cylinder (evacuation of gas from the sysytem into the empty cylinders), flushing out the entire system arrest all leakages by replacing the damaged flare nuts, teflon washers, brazing, gaskets, o rings etc and leak test by supply and charging with Nitrogen gas (N-2) under constant pressure of 250 - 350 PSI , watching the pressure for 24 Hrs for confirmation, flushing out the system vacuumising and recharge / charge the required qty of refrigerant and lubricant testing and commissioning the system complete all as specified and as directed for the following capacity compressor of AC plant :- Note: Refrigerant & compressor oil shall be measured and paid separately for maintained the level under respective items

11 to 13 TR Compressor

20 TR Compressor

M&L for repairs and servicing of FRP cooling towers of any capacity by disconnecting all connection, thorough cleaning of FRP casing header, PVC fins, replacement rusted nuts, bolts, washers and greasing/oiling of fan motor and fan bushes/bearing, checking fan assembly, replacement of existing perished filter screen of out-let connections, arresting leakage for all joints by applying FRP compound complete all as specified and as directed.

M&L for replacement of pvc fins of FRP cooling towers of any capacity by disconnecting all connection, replacement rusted nuts, bolts, washers and greasing/oiling of fan motor and fan bushes/bearing, checking fan assembly, replacement of existing perished filter screen of out-let connections, arresting leakage for all joints by applying FRP compound complete all as specified and as directed.

M&L for servicing the Air handling units dismantling sheet metal parts, blowing out the dust, chemical cleaning by spraying the organic based scale removing agent at the appropriate ratio till removal of complete dust & scale deposits in the fins area of cooling coil, flushing through for proper air flow across the coil, checking of the electrical connection, cleaning of air filters, greasing of blower motor, repair of blower shaft, replacement of un serviceable bearings, tightening of V-belts, clearing of water drain lines, renewal of rusted sheet metal screws and testing the unit complete all as specified and as directed for the following capacity AHU :-

AHU Capacity 22400 CFM (02 Nos) at Moolgavkar Hall

AHU Capacity 32 TR,19 TR, 7 TR,4 TR (each one) & 6 TR (02 Nos) Capacity at BTA Simulator II & III

AHU Capacity 22 TR (02 Nos) at PC 7 Simulator I

AHU Capacity 15000 CFM at SD Simulator

AHU 11806 CFM at WT, CRRW & 14 AFH

Water cooled chilled water type 3 x 20 TR Capacity at Kiran Simulator

M&L for preparation of surfaces by scrapping and removing rusted portion with wire brush and applying one coat of zink chromemetal primer and two coats of synthetic enamel paint by spray method for complete AC plant i'e compressor units, chiller unit, condenser unit, inlet/outlet pipe lines with connected valve, chiller & condenser pumps set, channels, one coat of white wash/colour wash to plinth of plant as per site requirement complete as per direction complete all as specified and as directed for the following AC plants :-

Air cooled, chilled water type 3 x 56 TR Capacity

Water cooled, chilled water type 3 x 37 TR Capacity

Air cooled, chilled water type 3 x 22.7 TR Capacity

Air cooled, chilled water type 3 x 24 TR Capacity

Air cooled, chilled water type 2 x 22 TR Capacity

Air cooled, chilled water type 3 x 22 TR Capacity

Water cooled chilled water type 3 x 20 TR Capacity

M&L for taking down unserviceable hermetically sealed compressor after disconnecting the suction/delivery lines and Supply & fixing hermetically sealed compressor of following capacities as per existing make, model & specification, including pressure testing, vacuumising and charging of refrigerant, testing and commissioning complete all as specified and as directed. Make : Copeland / Danfoss / kirloskar / Blue star / Voltas (As per site requirement) Note: Refrigerant shall be measured and paid separately under respective items.

20 TR Capacity

13 TR Capacity

12 TR Capacity

11 TR Capacity

M&L for taking down unserviceable liquid line filter drier and S&F new filter drier as per existing same make & specification and suitable size to fixing with existing refrigerant line for 11 TR to 13 TR capacity compressor of AC Plant complete all as specified and as directed.

M&L for taking down unserviceable liquid line filter drier and S&F new filter drier as per existing same make & specification and suitable size to fixing with existing refrigerant line for 20 TR capacity compressor of AC Plant complete all as specified and as directed.

Material & labour for repairs and overhauling of mono block pump sets (chiller/condenser pump sets) by disconnecting and taking out from position, dismantling and re-building the shaft at worn out places, machining to it’s original size, replacement of worn out bush/ball bearings, re-conditioning the impeller and gland bushings, replacement of packing, stud bolts etc., applying insulating varnish on the stator and rotor re-winding of burnt 415 V, 3 phase motors of following capacities with new super enameled copper wire of same gauge and same number of turns as existing, drying up and re-assembling the pump set, installing at it’s original location, connecting up all connections, testing and commissioning complete all as specified and as directed for the following capacities :-

upto 3.0 HP

Removing the unserviceable hand shut off valve (brass) from the refrigerant line after cutting the liquid line and S&F hand shut off (brass) valve of following sizes with necessary welding / brazing etc complete all as specified and as directed.

Material and labour for taking out the defective high/low pressure cut-outs of any range and model and S&F new high/low pressure cut-outs of following sizes connecting the pressure lines/control wiring complete all as specified and as directed.

HP/LP pressure cut-out MP-15

Water pressure cut-out IPS-70

Low pressure cut-out MP-1

High pressure cut-out MP-5

Oil pressure cut-out MP-55

S&F Digital type temperature and humidity sensors metering sytem wall mounted suitable for Central AC plant AHU Room including fixing on wall & electrical connections and removing the existing unserviceable ones complete all as specified and as directed.

M&L for repair/servicing programable microprocessor based control panel with touch screen display including repair all equipment protection devices etc. & replace wornout u/s single/three phase controllers, fuses, internal wiring as per existing same model & specification and suitable size to chiller unit central type AC Plant of 22 TR to 56 TR capacity, complete all as specified and as directed.

M&L for replacement of programable microprocessor based control panel with touch screen display including repair all equipment protection devices etc. internal wiring as per existing same model & specification and suitable size to chiller unit central type AC Plant of 22 TR to 56 TR capacity, complete all as specified and as directed. Make:- Suitable for Voltas / Bluestar AC plant (as per OEM recomended & site requirement)

Removal of the unserviceable air filters and S&F new air filters as per existing type of the following sizes for the AHU complete all as specified and as directed.

600 x 600 x 45 mm with 10 Micron

600 x 300 x 45 mm with 10 Micron

M&L for taking down unserviceable blower motor V Belt of any size and S&F blower motor V Belt as per existing model & specification and suitable size to fixing with existing system for AHU of central type AC Plants complete all as specified and as directed.

M&L thermal insulation with aluminium faced nitrile rubber 12 mm thick for duct/AHU as per existing density and thermal conductivity including packing material for the AC plants complete all as specified and as directed.

Material and labour for Thermal insulation cover with aluminium cladding sheet for 50 & 80mm dia chiller pipe line complete all as specified and as directed.

Removing unserviceable PVC water tank from humidifier system of plant and S&F new Loft mounted water storage tank LOFT type of 100 Ltrs capacity suitable for existing humidifier system of central type AC Plants, complete all as specified and as directed.

M&L for taking down old u/s chilled water storage water tank and S&F new Rotational moulded polyethylene water storage tanks double layer (cylindrical vertical with closed top) hoisted of 500 ltrs capacity including connections, flot valve and PCC/plaster work for heat protection insulation to PVC chilled water tank as per existing same complete all as specified and as directed.

M&L for rigid PVC conduit (medium grade) size 40 mm dia for pumps drain water out AC plant, laid on walls, ceiling, in floors with clamping / fixing mtrls complete all as specified and as directed.

Supply and filling / topping up / charging of Refrigerent gas R-407 for Central / Package type ACs complete all as specified and as directed.

S & F in replacement as per existing type MCCB 200 Amps ,415 volt ,36 kA Breaking capacity, thermal magnetic release 4 pole incl all terminals, fitting etc complete all as specified and as directed.

S & F in replacement as per existing type MCCB 100 Amps ,415 volt ,25 kA Breaking capacity, thermal magnetic release 4 pole incl all termnials, fitting etc complete all as specified and as directed.

S & F in replacement as per existing type MCCB 63 Amps ,415 volt ,25 kA Breaking capacity, thermal magnetic release 4 pole incl all termnials, fitting etc complete all as specified and as directed.

S&F MCBs C Series TPN 32/40 Amps 415V 10 kA incl all termnials, fitting etc complete all as specified and as directed.

S&F MCBs C Series SPN 6 to 40 Amps 415V 10 kA incl all termnials, fitting etc complete all as specified and as directed

S&F MCBs C Series SP 6 to 40 Amps Amps 415V 10 kA incl all termnials, fitting etc complete all as specified and as directed.

S&F in replacement for the following unserviceable spare parts for AC plants of any make & model complete all as specified and as directed for the following :-

Contactor rated current AC 3 Ph, 9 to 22 Amps, coil voltage 415 V AC, 50Hz, capacity as per existing specification.

Over Load Relay of range 7 to 25 Amps.

Control Relay of range 10-12 Amps as per site requirement.

LED Indicator lamps of colors R / Y / B.

Push button with element for starter.

S&F in replacement PVC Connectors 25 to 50 Sqmm.

S&F in replacement Chiller Sensors suitable for Blue Star / Voltas Central type AC Plant same as per at site.

S&F in replacement Chiller Thermometer for Central Type AC Plant same as per at site requirement.

S&F in replacement Condenser relief valve of Cap 350 PSI for Central Type AC Plant same as per at site.

S&F in replacement PCB Transformer 240 Volts for Central Type AC Plant same as per at site.

S&F in replacement of Air cooled condenser fan with blade & motor same as per at site.

S&F Single phase preventer same as per site requirement.

S&F Pressure gauges with syphon & cock and isolation valve etc., complete all as specified and as directed.

S&F Dial type Thermometers 0 to 50 degree Centigrade with syphon & cock and isolation valve etc. complete all as specified and as directed.

S&F Humidistat and Digital thermostat including control wiring complete all as specified and as directed.

S& F Fin type strip heater bank 20 KW capacity with control panel fixing in side, the duct fixed on insulators for each AHU, complete all as specified and as directed.

Supply, install, testing and commissioning of 3-way motorised valves 100mm dia with rapid control actuator for chilled water as per specification along with thermostat control, complete all as specified and as directed.

Supply, install, testing and commissioning of 3-way motorised valves 80mm dia with rapid control actuator for chilled water as per specification along with thermostat control, complete all as specified and as directed.

Supply, fixing, testing and commissioning of extruded aluminium grills/diffuser made out of powder coated aluminium sections all as per manufacturers instructions, complete all as specified and as directed.

M&L for GI Perforated type cable tray, 150 mm wide, 100mm depth including cover made out of 2mm thick GI sheet, including MS supports / threaded rods and anchor fasteners whereever required as per site conditions complete all as specified and as directed.

Removing the existing unserviceable butterfly valve of any size and supply and fix PP-R butterfly valve of following sizes including replacing of nuts, bolts, washers and packing and testing complete all as specified and as directed.

50 mm dia.

63 mm dia.

Supply & Laying, jointing & testing of XLPE UG LT cables, insulated, PVC sheathed aluminium conductor multi stranded armoured heavy duty 1100 Volt grade laid in trenches/ducts/along poles/through pipe under road etc with new aluminium lugs for the following cable sizes complete all as specified and as directed.

6 sqmm 4 core

10 sqmm 4 core

16 sqmm 4 core

25 sqmm 3.5 core

35 sqmm 3.5 core

Supply & fixing of chiller Water Piping of MS "C" Class cut to required length and installed with welded joints including all necessary fittings such as elbows,tees,bends, short pieces etc and conforming to the specifications and painting with one coat of red oxide primer and two coats of synthetic enamel paint, complete including providing necessary steel supports, also including pipe insulation with 30mm thick PUF with 26 gauge alluminium gladding sheet complete all as specified and as directed. The pipes shall be of the following sizes:

100 mm dia

65 mm dia

Supply and fixing Butterfly balancing valves of size 100 mm dia complete with companion flanges, nuts ,bolts, washers and gaskets etc., conforming to relevant IS complete all as specified and as directed.

Supply and fixing Butterfly balancing valves of size 65 mm dia duly insulated, complete with companion flanges, nuts ,bolts, washers and gaskets etc., conforming to relevant IS complete all as specified and as directed.

Repair & servicing of existing pump starters in the LT control panels of any rating/ type and any capacity, Replacing unserviceable components such as meters, cable lugs, Push buttons and CT coils etc including necessary wiring for DOL and Star- Delta starters using FRLS copper conductor of size not less than 1.5 Sqmm and necessary feruls and casing capping required to secure the wiring complete all as directed testing and commisioning to the entire satisfaction of the Engr-in-charge complete all as specified and as directed.

omsai thermax engineers (BID ID -3125273)

Universal refrigeration and Engineering Company (BID ID -3125142)