Augmentation of HVAC Plants in IIT Guwahati with 600TR centrifugal chiller and associated works

Amount

PART-A: Equipment

WATER-COOLED CENTRIFUGAL CHILLING UNIT (600 TR) Supplying, Installing, testing & commissioning of water cooled Positive/Negative pressure Centrifugal Type water chilling machine with unit mounted 2 stage factory fitted Variable Frequency Drive control console, with inbuilt Passive Harmonic filter having THDv <= 5% (at chiller level) having a capacity of 600 TR (Minimum) at chilled water inlet / outlet temperature of 53.6 deg.F / 44.6 deg.F with suitable chilled water circulation rate and condenser water inlet / outlet temperature of 88 deg.F / 97 deg.F with suitable circulation rate, suitable for stepless continuous capacity from 100% to 20% at Constant Condenser Entering Temperature of 88 degF without surging , envelope stablity control & hot gas bypass , for operation on refrigerant R134a/Chlorine Free HFO Based. each comprising of the following complete as per specifications and as required. Maximum power consumption including VFD loss and loss due to passive harmoic filter at 100 % load (Kw/TR) ≤ 0.54 (at AHRI Condt.) & ≤ 0.58 (at Design Condt.) and NPLV : ≤ 0.35., COP≥ 6.5 Fouling Factor for Evaporator & Condenser shall be 0.0005 & 0.001 FPS unit as per following specifications (from sr.no. 1.03 to 1.23). Condenser pressure drop : 8.5 m WC Evaporator pressure drop: 8.5 m WC

Suitable no.& capacity of Open/Semi Hermatic Centrifugal Two stage compression system compressor complete with automatic capacity control, safety switches, forced feed lubrication system etc. as per manufacturers specifications.

Suitable no & capacity squirrel cage induction motor totally enclosed refrigerant / air cooled type. Necessary insulation suitable for operation on 415± 10% volts, 50 ± 3% Hz , AC power supply.

Suitable number & capacity unit mounted Variable Frequency Drive with active harmonic filters suitable for compressor motor complete with ammeter with CTs, over load protection, under voltage protection against phase reversal and independent single phase preventors, timer control & trip circuit with sensing elements for HP/LP/Anti-Freeze, winding overload protection, thermistor and control etc complete as required as per manufacturer standard. THDi of the VFD shall be within 5% as per IEEE-519

Necessary drive arrangement

1 Set- Lubrication device consisting of automatic electric oil pump, oil cooler, head tank, oil strainer, automatic pressure regulating valve, oil heater, oil heater themal switch etc, as per specifications.Provision of forced lubrication of all parts during startup, running & shutdown of compressor as required as per manufacturer standard.

1 Set-Matching shell & tube water cooled condenser (shell side refrigerant and tube side potable water) of M.S/C.S shell and integrally finned copper tubes complete etc as required as per manufacturer standard.

1 Set- Matching shell & tube, flooded or falling film type chiller for centrifugal type units of MS/CS shell and integrally finned copper tubes complete etc as required as per manufacturer standard.

Lot-Refrigerant piping, fittings, valves and accessories, intercooler/economizer complete to inter connect compressor, condenser, chiller and expansion valve complete etc as required as per manufacturer standard.

Lot- Microprocessor based control panel unit mounted complete with accessories as per standard practice of manufacturer & specifications as required as per manufacturer standard.

Lot- Refrigerant line accessories comprising of safety valves, angle valve, liquid line indications, liquid level control to interconnect compressor, condenser, chiller and expansion valve. etc. as required as per manufacturer standard.

Lot- Water flow switches at inlet and outlet of condenser and chiller, water drain & air purge valves wherever required as per manufacturer standard.

Lot- Insulation in Suction line and chiller with minimum 25 mm thick polyvinyl nitrile rubber insulation at compressor suction/low temperature side

Lot- MS Frame work (including victaulic couplings at the inlet & outlet of evaporator & condenser; & painting of all components) for mounting the chilling unit with accessories viz. condenser, chiller, compressor and motor with base plate complete as required as per manufacturer standard.

Lot- Initial / first charge of refrigerant gas R134a/Chlorine Free HFO Based & compressor oil.

Lot- RCC /Cement concrete foundation for the chilling unit complete as per requirement of manufacturer.

Lot-Shock and vibration isolation for seismic zone-5. range of standard deflection of vibration isolator-20 to 30 mm

Chiller Sound Pressure level of chiller at all loads, 100%-20% at 1 M as per AHRI Standrad (575-08) shall not be more than 85 dBA, at 88 deg F

Cost of Chiller inclusive of first charge of refrigerant of Refrigeration capacity : 600 TR (Minimum) [INCLUDING CUSTOM DUTY and PRICE LOADING OF MACHINE CONSIDERING NPLV]

Country of Origin - Europe/USA/India/South Korea/Malaysia

PART-B: LOW SIDE

PRIMARY CHILLED WATER PUMP Supply, installation, testing and commissioning of End Suction centrifugal Back Pull out Type primary chilled water pump with CI casing, Bronze Impeller, Sleeve mechanical seal along with TEFC pump motor, 4 pole 1450 RPM for the following capacities, mounted and aligned on a common MS base and, drain assy, vibration isolators complete in all respects with insulation and shall be suitable for operation on 415 +/- 10% Volts, 50 Hz, 3 Phase AC power supply etc. complete as required as follows.

Flow - Min 1600 USGPM and 15 M Head

SECONDARY CHILLED WATER PUMP WITH VFD Supply, installation, testing and commissioning of End Suction centrifugal Back Pull out Type Secondary variable flow chilled water pump consisting of adjustable frequency drives (AFD) with CI casing, Bronze Impeller, Sleeve mechanical seal along with TEFC pump motor, 4 pole 1450 RPM for the follwoing capacities, mounted and aligned on a common MS base and, drain assy, vibration isolators complete in all respects with insulation and shall be suitable for operation on 415 +/- 10% Volts, 50 Hz, 3 Phase AC power supply etc. Head to be calculated as per site condition etc. complete as required as follows.

Flow - Min 1600 USGPM and 35 M Head

CONDENSER WATER PUMP Supply, installation, testing and commissioning of End Suction Back Pull Out Type Chilled Water recirculating pump with CI casing, Bronze Impeller, Mechanical Seal along with TEFC pump motor, 4 pole 1450 RPM for the following capacities complete mounted and aligned on a common MS base and, drain assy., vibration isolators complete in all respects and shall be suitable for operation on 415 +/- 10% Volts, 50 Hz, 3 Phase AC power supply. Head to be calculated as per site condition etc. complete as required as follows.

Flow - Min 1864 USGPM and 20M Head

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.

CHILLED WATER PIPE INSULATION Providing and fixing of chilled water piping by duly insulated with 75 mm thick inside building/75 mm thick outside building TF quality expanded polystyrene foam in pipe section 16 kg/cum density covered with a layer of vapour barrier and covered with 12 mm thick sand cement plaster on GI chicken wire mesh etc. complete as required as per specifications.

CONDENSER WATER PIPING Providing and fixing of MS heavy class ERW pipe for CONDENSER WATER CIRCUITcut to required length and installed with welded joints complete with in accordance to IS-1239 and IS 3589 standards (for pipe sizes above 150 mm NB). including providing necessary qunatities of flanges, fittings, bends, elbows, gasket, nut-bolts etc of following sizes and quantities etc. complete as required as follows:

Pressurization Unit SITC of Pump pressurization unit complete with mounting base frame, pressure switch, pressure gauge, isolating valves, check valves, Y-stainer, mouting arrangement, all accessories as per sepcifications and any other item reuired to make the system complete

Multistage centrifugal pressure pump of 0.75 Ltr/sec (1w+1s) @180kPa complete with all electrical panel, valve, pipes & accessories for close expansion tank. Specification: 0.85 HP, 0.55kW, RPM:2900/min

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

100MM NB with hand lever operated

50MM NB with hand lever operated

BALANCING VALVE Providing and fixing in position of following Water line Balancing - Valve as per following categories, sizes and qunatities complete with providing flanges, nut-bolts, gasket and welding arrangements: The valves shall be designed for PN 16 rating as per standard. The valves of sizes 32 mm to 65mm dia. shall be of gun metal / cast iron construction with screwed ends angular design hand wheel with locking facility. Whereas valves of sizes 80mm and above shall be of cast iron construction with internal parts of SS 410 and EPDM / nitrile seat with flanged ends. The test cocks should be long enough to protrude out of valve insulation etc. complete as required as follows.

NON RETURN VALVE Providing and fixing in position of following Water line Non Return - Valve as per following categories, sizes and qunatities complete with providing flanges, nut-bolts, gasket and welding arrangements: The dual plate check valves shall be used for horizontal / vertical run of pipes & shall conform to PN 16 rating as per standard. The valves shall have cast iron body, and SS 410 plates, SS 410 Shaft & Nitrile Seat etc. complete as required as follows. .

Y-STRAINER MS Providing and fixing in position of following Water line Y-Strainer as per following categories, sizes and qunatities complete with providing flanges, nut-bolts, gasket and welding arrangements: Y-strainer shall be fabricated out of Mild Steel, flanges as per BS 10 shall be provided at inlet and outlet of the connection. The body shall be pressure tested at 10 Kg/cm² and shall be hot dip galvanized. Permanent magnet shall be provided in the body of the strainer to arrest MS particles. Filter element shall be of non-magnetic 20 gauge SS sheet with 3 mm perforation etc. complete as required as follows.

350 MM dia

Providing and fixing in position of Pot Strainer with flange below of the following sizes etc. complete as required as follows.

FLEXIBLE BELLOW Providing and fixing in position of Rubber flexible bellow of the following sizes need to be installed in the pump to absorb the unwanted vibration of the pipe line suitable for handling the system working pressure etc. complete as required as follows.

Providing and fixing in position of GATE/BALL VALVE below of the following sizes need to be installed etc. complete as required as follows.

Providing and fixing in position of AUTO AIR VENT below of the following sizes need to be installed etc. complete as required as follows.

ELECTRICAL WORK

ELECTRICAL PANEL AS PER BELOW MENTIONED DETAILS

Design, fabrication, assembling, wiring, supply, installation, testing and commissioning of floor Mounted Electrical LT Panel Board made from 14 gauge thick CRCA sheet steeel in cubical formation with reinformcement of suitable size angle iron and channel T iron flats. All steel material used in the construction for panel shall undergo seven tank process before painting as per standadrs with 2 coats of red oxide primer and final approved shade of enamel paint. A solid basbar shall be provided at the bottom of the panel with two connecting eyes for termination. the boards shall be suitable for 415± 10% volts, 50 ± 3% Hz, 3 phase, 4 wire supply system. All the hardware used in the fabrication of the panel shall be galvanized with zinc passivation. The panel shall be compartmentalized to accomodate one feeder in each compartment. A verticabl cable alley of suitable width shall be provided to serve one or two vertical feeder sections. Also the opeing between the busbar cahmber and feeder section shall be shrouded with bakelite/hylam sheet with min. 3 mm thickness etc. complete as required as follows. The panel drawing shall be approved before taking up the fabrication

Design, fabrication, assembling, wiring, supply, installation, testing and commissioning of Secondary Pumping System Panel with VFD for 3 Pumps (50 HP- 2 Nos. & 25 HP – 1 No.) & Controller & DP Sensor etc. complete as required as follows.

Logic Controller for the pumps DP sensor for Variable Pumping application Signal cabling between DP Sensor to Pump Controller complete with protection Variable Frequency Drive of suitable capacity

POWER AND CONTROL CABLING

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

3.5 Core 400 sqmm XLPE Ar. Al Cable

4 Core 240 sqmm XLPE Ar. Al Cable

3 Core 95 sqmm XLPE Ar. Al Cable

3 Core 50 sqmm XLPE Ar. Al Cable

3 Core 35 sqmm XLPE Ar. Al Cable

3 Core 25 sqmm XLPE Ar. Al Cable

3 Core 16 sqmm XLPE Ar. Al Cable PP

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.

Witness testing of the chiller unit at factory at 4 different load points to be carried at design condition. All related cost for the testing including fooding, lodging, boarding, flight fare,VISA fair all inclusive for two persons from IIT side need to be borne by the bidder.Testing should be done on AHRI/Eurovent certified test bed.

DIAL TYPE PRESSURE GAUGE Providing and fixing in position following Water line PRESSURE GAUGE as per following categories, sizes and qunatities complete with providing flanges, nut-bolts, gasket and welding arrangements: Bourden type pressure gauges of 100mm dia of suitable range shall be provided.The water pressure gauge shall be made of stainless steel grade SS304. The dial plate shall be powder coated with white colour base & the calibration shall be done in black colour. All the pressure gauges shall be complete with ball valves & SS Siphon and confirming to IS:3624 etc. complete as required as follows.

DIAL TYPE THERMOMETER Providing and fixing in position following Water line INDUSTRIAL TYPE THERMOMETER, as per following categories, sizes and qunatities complete with providing all fixing accessories: The V form thermometer shall be made of aluminium die casting with golden colour anodizing. The thermometer shall have a V groove in the body to protect the refill from the damages during the installation. The refill shall be filled with blue colour mercury. The thermometer shall be complete with brass well & the calibration of temperature shall be in Celsius & Fahrenheit etc. complete as required as follows.

Supply & Fixing of GI CABLE trays made of GI slats 100 mm high and 2.6 mm thick complete with clamps and suspension arrangement comprising of MS rods (10 mm dia etc.) duly painted with polyurethane paint as per width of following sizes:

600 mm LADER TYPE

450 mm LADER TYPE

375 mm Perforated Type

300 mm Perforated Type

225 mm Perforated Type

150 mm Perforated Type

Chemical Earthing with copper electrode including accessories, and providing masonry enclosure with cover plate having locking arrangement etc. complete as required.

Supplying and laying 25 mm X 5 mm copper strip at 0.50 metre below ground as strip earth electrode, including connection/terminating with nut, bolt, spring, washer etc. as required. (Jointing shall be done by overlapping and with 2 sets of brass nut bolt & spring washer spaced at 50mm)

Supplying and laying 25 mm X 5 mm G.I strip at 0.50 metre below ground as strip earth electrode, including connection/terminating with G.I. nut, bolt, spring, washer etc. as required. (Jointing shall be done by overlapping and with 2 sets of G.I. nut bolt & spring washer spaced at 50mm)

Supplying and laying 6 SWG G.I. wire at 0.50 metre below ground level for conductor earth electrode, including connection/ termination with GI thimble etc. as required.

CONDENSATE DRAIN PIPING ( GI MEDIUM CLASS) Providing and fixing in position of Drain piping with GI B Class pipes with fittings duly insulated with 25 MM THICK "TF" qulaity (16 Kg/CuM density) EPS section, Vapour barrier and covered with sand, cement and plaster with GI chicken wire mesh along with necessary quantities of supports, flanges, bends, elbows, fittings, nut-bolts, gaskets etc. complete as required as follows:

DIPSAN UDYOG

Unity Engineers