Augmentation of New HVAC Plant in IIT Guwahati with 2X300TR air cooled screw chiller and associated works

Amount

PART-A: Equipment

Air cooled Chiling machine multiple semi-hermatic type horizontal twin-screw Compressor

Supplying, Installing, testing & commissioning of Air cooled chilling machine (AHRI certified) with multiple semi-hermatic type horizontal mono/twin-screw Compressor, multiple refrigerant circuits, VFD, Refrigerant Cooled Motor, Evaporator Flooded / Falling Film/DX type insulated chiller with ASME 'U'/PED Stamping, Air cooled condenser with low noise fans, Integral refrigerant piping, automatic controls & accessories etc. all mounted on steel frame as per specifications. Compressor make must be from OEM only for better service during the entire tenure of chiller. Each unit shall have minimum two independent refrigerant/ power/ control circuit such that in case of failure of one compressor, second circuit shall be able to run. No third party compressor will be acceptable. Motor shall be of high efficiency suitable for 415± 10% volts, 50± 3% Hz, 3 phase AC supply. Controls shall be suitable for hookup to BMS, compatible with BacNet / Modbus. The chiller should have in built programmable card for soft integration with BMS. The chiller should having a capacity of 300 TR (Minimum) at chilled water inlet / outlet temperature of 54.0 deg.F / 44.0 deg.F with suitable chilled water circulation rate, for operation on refrigerant R134a/Chlorine Free HFO Based. each comprising of the following complete as per specifications and as required. Vendor to submit AHRI Certified performance sheet for the same.

(i) Air cooled condensers (ii) Chillers should be with Copper tube and Aluminium finned air cooled condenser with corrossion resistive coating for all kinds of environmental corrosion . (iii) Chiller must be having latest BEE 5-Star rating. The model quoted must be reflecting in the BEE website for 5 Star rating. (iv) Chiller shall have complete first charge of refrigerant & oil. (v) Chiller shall have Micro-processor based controls with graphical / alpha-numeric display in English for all operating parameters such as supply voltage, frequency, load current, chilled water inlet, chilled water outlet & operating pressures etc. Victaulic couplings / connection flanges at the Chiller inlet and outlet shall be supplied along with the chiller package. The display of the chiller should have protective enclosure in order to avoid any water ingress during monsoon. Spring isolators to be provided along with chiller package. Quoted Prices shall be inclusive of vibration isolation. (vi) The electrical control panel shall be factory fabricated, unit mounted type, complete with suitable rated incomer power disconnect switch / breaker (MCCB / ACB) and with all safeties, interlocks & protections such as over load, short circuit and single phasing prevention. Main control panel should also display output frequency and voltage to the motor. (vii) Chiller shall be complete with Panel mounted VFD for all the Compressors (free standing VFD & Compressor mounted VFD is not acceptable): (viii) Chiller shall be tested at 4 Points (100%, 75%, 50%, 25%) loads at AHRI Certified Test Bed at factory & the same shall be witnessed by customer/consultant. (ix) Evaporator Water flow rate: 700 USGPM (x) Evaporator Pressure Drop: 11 Ft (xi) Condenser type : Copper tube aluminum fins (xii) The chiller operating parameters shall be : (xiii) Chilled water IN 54ºF (12.2ºC) (xiv) Chilled water OUT 44 ºF (6.7ºC) (xv) Operating Ambient Temperatur 104 °F (40°C) (xvi) Chiller Fouling Factor 0.0005FPS (xvii) Referigerant R134a (xviii) COP @ AHRI conditions > 3.40 (xix) IPLV @ AHRI conditons > 5.80 (xx) IKW/TR at Design: Not exceeding 1.26 IKW/TR (xxi) 300 TR actual capacity @ above conditions. (xxii) The cost should include design and make suitable foundation with Shock and vibration isolation for seismic zone-5 for above Chiller as per OEM guidelines. (xxiii) Country of origin - Europe/USA/India/Thailand

PART-B: LOW SIDE

Centrifugal Pumps:

SITC of Centrifugal type pumps complete with motor, factory fitted mechanical seal, common base frame for pump and motor, coupling & coupling guard, foundation bolts, vibration isolators, insulation (if applicable), all accessories as per specifications mentioned in Technical Data sheet A & B and any other item required to make the system complete.

Duty: Primary Chilled Water Pump Flow Rate (without any negative tolerance): 700 USGPM Head: 80 ft WG Type: End Suction Back pull Out Long Coupled Motor Rating in KW (Maximum): 11.00 Power Supply: 415V, 3 Phase, 50 Hz Working + Standby: 1 + 1

Duty: Secondary Chilled Water Pump Flow Rate (without any negative tolerance): 967 USGPM Head: 129 ft WG Type: End Suction Back pull Out Long Coupled Motor Rating in KW (Maximum): 37 Power Supply: 415V, 3 Phase, 50 Hz Working + Standby: 1 + 1

Variable Speed Pumping Systems:

SITC of Variable Speed Pumping System complete with One adjustable frequency drive for each secondary pump (including standby pump), one dedicated microprocessor based pump controller (with parallel pumping software for each zone downloaded), minimum 2 sensors/transmitters per zone, power/control cabling/wiring between the controller, VFDs, Sensors/Transmitters etc., mounting arrangements/ frames/ supports etc., all accessories as per specifications and any other item required to make the system complete (Variable Speed Pumping System for Secondary Chilled Water)

VFDs shall be supplied loose in IP-20 (Minimum) Degree of Protection. All VFDs shall be mounted in a separate panel as per the schedule of electrical panels.

Master Controllers shall be supplied loose in IP-20 (Minimum Degree of Protection) and shall be mounted in a separate panel as per the schedule of electrical panels.

VFDs shall not be provided with any bypass starter in the electrical panels - whether specified in general specifications or not.

Master Controller with all required hardware and software

Sensors/ Transmitters with complete as req.

Miscellaneous all other items including but not limited to control wiring between the sensors, controller and variable frequency drives

Variable Frequency Drives of Rating, in KW: 37.00

CHILLED WATER PIPING

Providing and fixing in position of the following nominal sizes MS Heavy class chilled water piping, cut to required length and installed with welded joints complete with all necessary fittings, supports, bends, elbows, flanges, vibration isolators, insulation etc. The pipes shall be as per IS 1239 and IS 3589 standards (for pipe sizes above 150 mm NB) etc. complete as required as follows.

Dismantling & Miscellaneous Works:

Dismantling of Mild Steel Piping:

Dismantling of Existing MS Heavy Class Chilled Water Piping complete with fittings (elbows, tees, reducers, sockets etc.) in existing trenches including cutting of pipes and shifting of all dismantled materials to the site store. Nominal Diameters of Pipes in mm x Thickness in mm as indicated below:

125 x C Class

Insertion of Dead Plates in Existing Mild Steel Piping:

Cutting of Existing MS Heavy Class Chilled Water Piping in existing trenches and insertion of 7.00 mm thick dead plates in them including cutting & welding of pipes and SITC of dead plates. Nominal Diameters of Pipes in mm as indicated below:

WATER LINE VALVES, STRAINERS & ACCESSORIES

Providing and fixing in position of Following Water line Valves, Stariners and accessories as per following categories, sizes and qunatities complete with providing flanges, nut-bolts, gasket and welding arrangements etc. complete as required as follows:

BUTTERFLY VALVE

Providing and fixing in position of following Water line Butterfly-Valve as per following categories, sizes and qunatities complete with providing flanges, nut-bolts, gasket and welding arrangements: Butterfly valve shall be of PN 16 rating as per standard. Valves of sizes 32 mm and above shall be made out of Cast Iron body, SG iron disc with Nylon coated, SS-431 Stem, EPDM integrally moulded liner with hand lever/Gear Box. Valves up to 150 mm NB shall be with detachable hand lever operation whereas valves above 150 mm NB shall have warm gear operation etc. complete as required as follows.

350 MM NB with Gear operated

300 MM NB With Gear operated

250 MM NB With Gear operated

200 MM NB With Gear operated

SITC of following Valves/ Strainers/ Pipe Flexible Connectors/ Gauges / Thermometers etc. complete with fittings/flanges, nuts, bolts, gasket, supports, all accessories as per specifications and any other item required to make the system complete. Nominal Diameters in mm as indicated below:

Wafer Type Dual Plate Check Valves:

Gun Metal Body Gate Valves:

Neoprene Rubber Type Flexible Pipe Connections with Metal Retaining Rings and Control Rods:

Brass Body Auto Air Vent Valves:

Insulation Works:

Thermal Insulation on various pipes using Fire Retardant (TF Quality) Expanded Polystyrene Insulation of 20 kg/ m3 density complete with accessories as per specifications and finaly covered with chiken wire mesh and 10 mm thick sand cement plaster in two layer and two coat of approved brand of painting on the pipes. Nominal diameter of Pipes and insulation thickness in mm as indicated below:

Finish: Sand Cement Plaster

Thermal Insulation of Valves:

Thermal Insulation on various Valves using Insulation material & Finish as that of the connecting Pipes complete with accessories as per specifications. Type of Valves and Nominal diameter of Valves in mm as indicated below:

Insulation of Butterfly Valves:

Insulation of Dual Plate Check Valves:

Insulation of Gate Valves:

Electrical Works:

HVAC Electrical Control Panels:

Power and Control Cabling:

SITC of Power / Control cabling including supply of cables & cable trays, supports, installation, saddles, cable ties, cable tags, ferrules, cable glands, lugs, nuts/bolts/hardware etc. complete in all respects as per specifications and any other item required to make the system complete.

3.5C x 240 Sqmm Aluminium

3C x 25 Sqmm Aluminium

2C x 2.5 Sqmm Copper

Earthing:

SITC of GI Earthing including supply of bare GI strips/ wires, supports, installation, saddles, ties, tags, ferrules, terminations, lugs, nuts/bolts/hardware etc. complete in all respects as per specifications and any other item required to make the system complete.

75 x 6 Strip

25 x 3 Strip

6 SWG Wire

Supply and Laying of 1.1KV Gr. XLPE armourd Copper Cable with termination glands and GI earthing, identification tags, clamps. Saddles etc. complete as required as per following sizes:

3 Core 1.5 sqmm Cu Control Cable.

2 Core 1.5 sqmm Cu Control Cable.

Carrying out Minor Civil Works including supply of all materials required to carry out the job, including Making and Dressing of Openings in Masonry Structure (excluding the RCC structures) for running Ducts / Pipes / Cables etc.

Supplying, fixing, testing and commissioning of following valves, strainers, gauges in the chilled water plumbing duly insulated to the same specifications as the connected piping and adequately supported as per specifications.

BUTTERFLY VALVE (MANUAL) with C | body SS Disc, Nitrile Rubber Seal & O-Ring PN 16 pressure rating for chilled water/hot eater circulation as specified

200 mm dia

150mm dia

80mm dia

65mm dia

50mm dia

40mm dia

BALANCING VALVE WITH BUILT IN MEASURING FACILITY with CI body flanged construction with EPDM coated disc with long pitch with protected out pipe insulation & PN 16 pressure rating for chilled /hot water circulation as specified.

200 mm dia

150mm dia

125mm dia

100mm dia

NON - RETURN VALVE with duel plate of C I body SS plates vulcanized NBR seal flanged end & PN 16 pressure rating for chilled /hot water circulation including insulation as specified.

200 mm dia

150mm dia

125mm dia

100mm dia

Y-STRAINER of Ductile CI Body flanged ends with stainless steel strainer for chilled / hot water circulation including insulation as specified

200mm dia

150mm dia

125mm dia

100 mm dia

Pressure Gauges:

Industrial Type 100 mm Dial Pressure Gauges complete with syphons, gauge cocks, fittings, all accessories as per specifications and any other item required to make the system complete.

Thermometers:

Industrial Stem Type (150 mm Length) Thermometers complete with thermo wells, fittings, all accessories as per specifications and any other item required to make the system complete.