GE/ALP (8599) KOLKATA OF 2025-26

OLD OT COMPLEX Comprehensive operation and maintenance of (12X 24 ) TR capacity air-cooled central AC plant, including regular servicing, preventive and corrective maintenance of all equipment and accessories such as air-cooled condensers, compressors, evaporator/coils, motors, fans, refrigerant piping, control panels, electrical wiring, safety devices, VFDs/starters, vibration isolators, refrigerant charging, microprocessor-based control system, and associated auxiliaries through OEM Only Scope of work includes: 1-Routine inspection, servicing, lubrication, and alignment of all rotating equipment. Cleaning of condenser coils, evaporator coils, air filters, strainers, and cooling circuit for optimum heat transfer. 2-Checking and tightening of electrical connections, preventive maintenance of MCC/Control Panel. Testing and calibration of safety controls – HP/LP cut-out, thermostats, pressure switches, overload relays, etc. 3-Attending breakdowns, fault finding, and replacement/repair of defective parts. 4-Gas charging/top-up of refrigerant as required, leak detection and rectification. 5-Maintaining logbooks of operating parameters (pressure, current, voltage, temperature, superheat, sub-cooling, oil level, etc.). 6-Ensuring continuous, efficient, and safe operation of the plant to maintain designed cooling capacity. Includes: All spares, consumables, refrigerant, oil, tools, manpower, and transportation during the contract period.

Following spares for AC Plant of (12X 24 ) TR. Make - Blue Star

Repair & Maintenance of upto 1.0 HP gear Motor

Re- winding of motor of capacoty 7.5 HP

Re- winding of motor of capacoty 10 HP

Supply and fixing of upto 3.0 HP gear operating Motor suitable for AHU

Supply and fixing of 5.0 HP gear operating Motor suitable for AHU.

Supply and fixing of PCB for Chiller

Supply and fixing motor for Chiller

Supply and fixing of Fan Blade for Chiller

Supply and fixing of contractor for Chiller

Supply and fixing of V-Belt with following size- A-69, A-56,A-56,A-50,A-42,A59,A-39,A-60,A-79 .

Material and labour for HEPA filter of EU 13 normal flow, media construction microscopic fiber glass + aluminium sepeartor of 99.99% efficiency, particals to be filtered down to 0.3 mircon, initial pressure drop 25mm of water gauge, final pressure drop 60mm of water guage including dismentaling of existing old HEPA filter complete all as specified and directed.

Supply and fixing of AHU air filters .5 micron suitable for AHU complete all as specified and directed.

Supply and fixing of AHU pre air filters .5 micron suitable for AHU complete all as specified and directed.

Supply and charging refrigerant 134A/ 410 A complete all as specified and directed.

Supply and fixing of in repair Carbon water seel for condenssor pump complete all as specified and directed.

Descaling and cleaning of AHU coils from outside and cooling tubes from inside by flowing suitable chemical in the tubes for removing all foreign material deposited in the coil and tubes in every 6 months or as and when ordered by Engineer-in-Charge. [Note: Rates quoted by contractor deemed to be inclusive of necessary arrangement viz. necessary water jet pumps, coil cleaning chemicals, tools etc]

Supply & fixing in repair canvas cloth suitable for AHU including taking down old canvas complete all as specified and directed.

Material and labour for painting with one coat of red oxide primer Epoxy Zinc Phosphate and two coats of PU Full Gloss Enamel paint including preparation old/ new surface of steel of any description complete all as specified and directed.

Material and labour for dismantling of old butterfly valves and fixing of new Butterfly valve of make: C&R/ Kartar/ Pelicon or equivalent in other approved make all as specified and as directed suitable for the following sizes of pipe:

40/ 50 mm bore

80 mm bore

100 mm bore

M & L for PN 1.6 rated air vent valve having brass body, cover, adopter, disc assembly & cap, stainless steel strainer, plastic float and 20 mm screwed threaded ends suitable for maximum operating temperature 100 °C installed on all high points in the water piping system to automatically remove the trapped air with necessary accessories all complete as specified and directed. Make: Emerald, Rapid Cool, Sant

S & F of 6" dual scale (°F / °C), lower mount (radial), bimetal thermometer having 0.5 NPT process connection, Grade A accuracy class as per ASME B40.200, stem diameter 6.35 mm, laminated safety glass window, stainless steel 304 case, steam, process connection & joint, aluminium dial & pointer, IP67 protection, scale range 0- 60 °C with necessary accessories all complete as specified and directed. Make: FIEBIG, General, H GURU, TSI, WIKA, WAREE

S & F of 4" bourdon tube pressure gauge conforming to EN 837-1, having copper alloy process connection & pressure element, plastic black pointer & case, plastic crystal-clear window, snap-fitted in case, accuracy class 2.5, scale range 0- 25 bar with necessary accessories all complete as specified and directed. Make: FIEBIG, General, H GURU, WIKA, WAREE

S & F of 32 mm thick flexible closed-cell elastomeric thermal insulation (in tubular form) made of elastomeric foam based on synthetic rubber (NBR / PVC), tested for maximum service temperature 100 ºC as per ASTM C534 & minimum service temperature -50 ºC as per ASTM C534, thermal conductivity λ ≤ 0.037 W/mK at mean temperature θm = 24 ºC as per ASTM C518 / C177, ASTM C335, water absorption by volume ≤ 0.2% as per ASTM C 209 / C1763, flame spread index (FSI) & smoke development index (SDI) 25/50 as per ASTM E84, flammability HB, V-0 as per UL 94, fungi resistance as per ASTM G21/C1338, mould growth resistance as per ASTM E2180-18 / UL 181 and ozone resistance as per ASTM D 1149-18 along with self pre-covered self-adhering, UV treated glass cloth of thickness 7 mm / 200 GSM adhesives and other necessary accessories complete all as specified and directed. Make: Armacell, K Flex, Kaimann Flex, Vidofle

M & L for chilled water piping including necessary fittings viz. flexible connections, bends, tees, reducers, flanges, air purge valves, drain valves, structural support, necessary clamps, vibration isolators, etc. including painting and supporting / fixing the pipe in excavated trenches or on floor / wall / ceiling with clamps, hangers, angles, channels (using anchor fasteners) with necessary accessories, duly insulated complete all as specified and directed. Make: BST, Jindal Star, MSL, SAIL, Surya, Tata

M & L for PN 1.6 rated 'Y'- type strainer, certified for 300 psig Hyd. body test pressure and 150 psig working test pressure, having cast iron (CI) Gr. FG 200 body & cover conforming to IS 210: 2009, AISI304 plug, AISI304 stainless steel screen trim having 1.2 mm perforation, bolted cover, compressed asbestos fiber gasket, flanges as per BS 10 Table F undrilled, duly insulated with elastomeric thermal insulation complete with necessary accessories all as specified and directed. Make: Advance, Emerald, Honeywell, Leader, Rapid Cool, Sant NOTES: [i] Insulation shall be measured and paid for separately.

M & L for CL#125 two-piece design cast iron (CI) straight pattern ball valve, conforming to IS 9890: 1981 and having FG 200 cast iron body conforming to IS 210: 2009, AISI 410 stem, stainless steel AISI 304 ball, renewable PTFE seat & gland packing and screwed female BSP parallel threaded ends conforming to BS 21 with necessary accessories all complete as specified and directed. Make: Advance, Audco, Honeywell, Leader, Sant ,Karter,

S & F of black flexible closed-cell elastomeric thermal insulation made of elastomeric foam based on synthetic rubber (NBR / PVC), tested for maximum service temperature 1

25 mm thick thermal insulation

M &L For Monthly Cleaning of AHU Filters – Work includes removal of AHU filters of mother and child Plant contains 5 Nos AHU (pre-filters, fine filters, or bag filters as applicable), thorough cleaning using vacuum cleaner/air pressure washing/water jet (depending on type), drying and refitting in proper position. During cleaning, filters shall be checked for damages, clogging, or deterioration of media, and defective filters shall be reported for replacement. Filter holding frames and sealing gaskets shall also be cleaned to prevent dust bypass. After refitting, AHU shall be run to check air flow, pressure drop across filters, and overall performance. Cleaning shall be carried out once every week as preventive maintenance to ensure hygienic indoor air quality and energy-efficient AHU operation.

supplying, installation, of aluminium air diffuser / grille made of extruded aluminium sections, with powder-coated finish, suitable for ceiling / wall mounting as required. The diffuser / grille shall be complete with collar adaptor, volume control damper (VCD) made of aluminium sheet with locking arrangement for air balancing, and all necessary fixing accessories. The diffuser / grille shall be of flush type / step type / double deflection type as per approved drawings and direction of Engineer-in-Charge. It shall be fixed to the ductwork with proper airtight connection using nuts, bolts, and gasket tape.

Fabrication, supply, and installation of air-conditioning ducts made of 22 gauge (0.8 mm thick) G.I. sheet, conforming to IS:277 with zinc coating not less than 120 g/m², fabricated as per IS:655 / SMACNA standards, including straight ducts, bends, elbows, reducers, offsets, transitions, and other fittings, complete with TDF/TDC/S & drive joints, gaskets, corner pieces, bolts & nuts, mastic sealant, supports/hangers with angle/channel/rods, vibration isolation pads, access doors where required, and testing for air tightness, complete as per drawings and engineer-in-charge direction.

M &L For Overhauling of Electric Motor/punps of capacity upto 10 HP including Bearing Replacement – The work shall consist of complete dismantling of the motor from its foundation, disconnecting electrical and mechanical connections, opening of end covers, removal of rotor, fan, and terminal box. Thorough cleaning of all motor parts such as stator, rotor, fan cover, and housing using air pressure and solvent/kerosene wash to remove dust, dirt, oil, grease, and carbon deposits. Inspection and testing of stator winding for insulation resistance with megger, cleaning. Replacement of worn-out bearings with new heavy-duty sealed bearings of approved make (SKF/FAG/NTN), ensuring proper seating, lubrication, and alignment. Dynamic balancing of rotor (if required) to reduce vibration and improve efficiency. Reassembly of motor with correct alignment of rotor, shaft, coupling/pulley, and tightening of all fasteners with proper torque. Final testing and commissioning of motor at site under no-load and load conditions, checking current consumption, temperature rise, vibration, and noise level, ensuring smooth, vibration-free, and efficient operation complete all as specified and directed.

Supplying, installation, testing and commissioning of Air Curtain of size 4 feet (1200 mm) suitable for mounting above entrance door, designed for commercial/industrial use. The unit shall be constructed in powder-coated mild steel body, equipped with high-speed dual blowers and heavy-duty motor for continuous operation. Air velocity at outlet not less than 15–18 m/s, coverage height up to 8–10 feet, operating on 230V AC, single phase, 50 Hz supply. The unit shall include all accessories, mounting brackets, power cable connections, vibration isolators, and commissioning at site complete as directed by Engineer-in-Charge. Make: Cross Air (Model: As per site requirement / approved equivalent)

Supplying, installation, testing and commissioning of a humidity control system consisting of an electrical strip heater bank of suitable capacity capacity suitable for operation on 230 V AC, single phase, 50 Hz supply. The system shall include stainless-steel (or GI) finned strip heaters mounted in a suitable dust-proof enclosure, complete with thermostatic/humidistat control for automatic regulation of humidity in the conditioned space. The assembly shall include all accessories such as temperature & humidity sensors, control relay/contactors, indicator lamps, power wiring, terminal blocks, mounting hardware, interconnections to the control panel, and complete commissioning at site as directed by the Engineer-in-Charge.

Providing, installation, testing and commissioning of Industrial Type Dehumidifier having water extraction capacity of 50 litres per day at 30°C and 80% RH, suitable for continuous duty operation in high humidity areas. The unit shall be complete with hermetically sealed rotary compressor, air filter, evaporator and condenser coils of copper with aluminium fins, automatic humidistat control, condensate collection tank with auto shut-off . The body shall be made of corrosion-resistant steel or powder-coated metal, mounted on castor wheels for easy movement. The unit shall have digital humidity and temperature display, washable filter, and operate on 230V, single phase, 50Hz AC supply. All necessary wiring, accessories, and controls shall be provided to make the equipment fully functional and ready for operation as per the direction of the Engineer-in-Charge.

00 ºC as per ASTM C534 & minimum service temperature -50 ºC as per ASTM C534, thermal conductivity λ ≤ 0.037 W/mK at mean temperature θm = 24 ºC as per ASTM C518 / C177, ASTM C335, water absorption by volume ≤ 0.2% as per ASTM C 209 / C1763, flame spread index (FSI) & smoke development index (SDI) 25/50 as per ASTM E84, flammability HB, V-0 as per UL 94, fungi resistance as per ASTM G21/C1338, mould growth resistance as per ASTM E2180-18 / UL 181 and ozone resistance as per ASTM D 1149-18 along with self pre-covered self-adhering, UV treated glass cloth of thickness 7 mm / 200 GSM adhesives and other necessary accessories complete all as specified and directed.