SPL REPAIRS/ REPLACEMENT OF BER AC PLANT OF MISSAR MINE WORKSHOP AT NAD TROMBAY

DISMANTLING & REMOVAL OF EXISTING EQUIPMENT Dismantling all the parts and components of existing central AC plant of following capacity and consisting of following major components & relocation in the Premises/storeyard as allocated by Engr-in-charge. Scroll chillers Chilled Water Pumps Cooling Water Pumps Pipes and valves Cooling Towers Main Chiller Panel, cabling and wiring etc AHUS & ducting (a) 150/160 TR Note - Capacity mentioned above are approximate. - After dismanteling the plant room and other building structure damaged or disturbed so, shall be made good and duly prepared including all civil works as may be equired for installation of new air conditioning plants and machineries as per given scope of work here under.

CENTRAL AIR CONDITIONING SYSTEM Supply, Install, testing, balancing and commissioning of central air-conditioning plant as per scope of work given in the following items and sub items of work to maintain design temperature of 22 ± 2°C and humidity of 55 ± 5% at the given building and as shown on Annexure-'A' in Misser Mine, NAD Mankhurd and based on other conditions as given in the User Data sheet and all as required as per the standard code of practice in the given field. Care has been taken to include all items as per below given detail however in case any item of work civi or electrical or mechanical not specifically specified but essentially required for successful and efficient completion and commissioning of air conditioning system shall be procured and fitted in the system to achieve the targeted and optimum performance, the cost of which is deemed included in the quoted tender rates against each item and as a whole of the system. WATER-COOLED INVERTER SCROLL TYPE CHILLER UNIT AHRI CERTIFIED Supply, installation, testing and commissioning of INVERTER SCROLL AHRI CERTIFIED, factory designed, pre-fabricated and floor-mounted hermetically sealed Inverter scroll type water cooled chiller machine of at least TR as mentioned in below nominal capacity and complete with scroll compressors having independent refrigerant circuits & automatic stepless capacity control, water-cooled type condenser, horizontal flooded type evaporator with MS shell and seamless copper tubes with elastomeric insulation, suitable numbers of herrmatically sealed Inverter compressor/s, lubrication system as per manufacturer's design required for smooth and trouble-free operation of the chiller package, common base frame, interconnected copper refrigerant piping along with elastomeric insulation, fittings, valves, expansion valves and accessories to interconnect compressor, condenser, chiller and expansion valve, microprocessor based control panel comprising of controls including sensors and equipped with a keyboard, LCD touchscreen min 7" access input system, protection and monitoring devices to perform control functions, wiring, vibration isolators, gauge panel, automatic safety controls, flow switch at evaporator and condenser and ozone friendly, CFC-free refrigerant R- 410A/R407A all complete as specified and directed by the engineer-in-charge and accessories complete to maintain inside condition as under : Temp - 22 ± 2°C RH - 55 ± 5 % Air changes - As shown in Annexure-'A' Operational period Annexure-'A' and comprising of the following :- - Restrained Spring Isolators Vibration Isolator Of Approved Make and specifications - Spring elements shall have a lateral stiffness greater than 1.2 times the rated vertical stiffness and shall be designed to provide a minimum of 50% overload capacity. Non-welded spring elements shall be polyester powder coated, and shall have a 1000 hr rating when tested in accordance with ASTM B-117. Springs shall be deflections as per operating load design of equipment. The chiller shall conform to the following requirements / specifications: [i] Chilled water inlet/outlet temperature: 12/7 ˚C [ii] Evaporator fouling factor: 0.000018 ⁰Fft²hr/Btu [iii] Condenser water inlet/outlet temperature: 32/37 ˚C [iv] Condenser fouling factor: 0.000044 ⁰Fft²hr/Btu [v] Refrigerant (Ozone friendly type): R410A/R407C [vi] Test standard: In Accordance with ISEER / AHRI / ARI / As per OEM NOTES: [i] Mapping shall be required for all critical points displayed on the chiller control panel. The chiller shall be BMS compatible and shall have RS485 / RS232 serial communication protocol. [ii] The unit shall be suitable for 3- Phase, 415 V ± 10%, 50 Hz AC electric supply,with a built-in microprocessor based control panel. - Single Arch Rubber Bellow for Chillers as per requirement complete with Control Guide Assembly - Initial / first charge of refrigerant gas & compressor - Necessary civil work viz. foundation for placement of chillers, etc. shall be deemed to be included in the scope of work. Make: BLUESTAR / VOLTAS / CARRIER / DAIKIN / KIRLOSKAR

Actual Min Capacity - 50 TR x 3 Nos (2W+1S)

CTI CERTIFIED Induced Draft COOLING TOWERS Design & Supply, installation, testing & commissioning of FRP construction, Induced Draft, Cross flow Cooling Towers (single / multicell as mentioned below), complete with FRP basin, honeycomb design PVC fill, drift eliminators, hot water distributors, low noise adjustable pitch propeller type fan of FRP & Belt Driven along with casing, coupled with TEFC Squirrel cage induction motor weather-proof with cowl for outdoor installation. Basin shall be provided with accessories like quickfill, makeup & drain pipes, Pvc construction float valve, overflow pipe etc. Motor shall be suitable for 415V ± 10%, 50Hz ± 5%, 3-phase AC supply. Motor shall be suitable for VFD operation i.e. motor suitable for any low voltage & low frequency range due to speed variation through VFD without heating and noise generation. Separate motor shall be provided in each cell in case of multi cell towers. The fan / fan motor shall be isolated from the cooling tower structure . Each tower/ each cell shall be complete with its suitable HDG Steel ladder with safety cage as per specifications. The cooling tower shall be certified for test procedure as per CTI STD-201. Motors shall be TEFC, Squirrel cage induction motors, IP 66, Class F insulation. Motor Effeciency shall be as per ECBC 2017: ECBC: IE4 Cooling Towers Efficiency: As per Table 5.18 of ECBC-2017 The maximum allowable sound power at a distance of 3m from the equipment shall not be more than 75 dB(A) without sound deflector cowls. Necessary civil work such as cooling tower foundations & steel structural work for placing of cooling towers on terrace are excluded from the scope of work. But necessary foundation nuts / bolts & vibration isolation compression gasket between fan housing & FRP casing to be provided. Each Cell of the tower shall have HDG Steel ladder with safety cage . Cooling Tower Type 1: Weather conditions of site location (NAD Mankhurd) Mumbai as mentioned  below: *Summer DBT / *Summer WBT: 110°F | 75°F *Monsoon DBT /* Monsoon WBT: 95°F | 83°F Wet bulb temp. to be considered for cooling tower sizing: 83°F Cooling Tower Approach: 7°F Condenser water OUT (Leaving Water Temp.) LWT: 89.6°F (Considered WBT + Cooling Tower Approach) Condenser water IN (Entering Water Temp.) EWT: 89.6°F Chiller capacity: As per Sl Item 1.1 to 1.8 Cooling Tower capacity: As mentioned below Condenser water flow rate: 4 USGPM X TR of Chiller Capacity Cooling tower's capacity should be adequate for total heat rejection, which shall be the total chiller capacity (TR) plus the BHP of chiller motor (IKW of motor) i.e. motor heat. Cooling Tower as described above. Make : ADVANCE / PHARPUR / MIHIR

Not less than 480 USGPM / 120 TR

CHILLED WATER PUMP Supply, Installation, Testing and Commissioning of Centrifugal pumps of End Suction Back Pull out design coupled with TEFC squirrel cage induction motor, factory mounted on a common base frame. Pump set shall be provided with bronze impeller, CI Body, mechanical seal & cushy foot mounts for vibration isolation. Motor shall be suitable for 1440 RPM, 415 ± 10% volts, 50 ± 5%Hz, 3 phase AC supply. Pumps shall be selected for following performance characteristics as mentioned below: Motors shall be TEFC, Squirrel cage induction motors , IP 55, Class F insulation. Motor Effeciency shall be as per ECBC 2017: ECBC: IE3 Pump Mechanical Efficiency: As per ECBC: 2017: As per ECBC: Not less than 80% Motor for VFD driven pumps shall be suitable for VFD operation with higher grade of winding insulation to take care of heating due to operation at lower frequencies & lower voltages. Make : Grundfos / WILO / Armstrong / KIRLOSKAR

Not less than 130 USGPM / 30-35 M Head (2W+1S)

CONDENSER WATER PUMP Supply, Installation, Testing and Commissioning of Centrifugal pumps of End Suction Back Pull out design coupled with TEFC squirrel cage induction motor, factory mounted on a common base frame. Pump set shall be provided with bronze impeller, CI Body, mechanical seal & cushy foot mounts for vibration isolation. Motor shall be suitable for 1440 RPM, 415 ± 10% volts, 50 ± 5%Hz, 3 phase AC supply. Pumps shall be selected for following performance characteristics as mentioned below: Motors shall be TEFC, Squirrel cage induction motors , IP 55, Class F insulation. Motor Effeciency shall be as per ECBC 2017: ECBC: IE3 Pump Mechanical Efficiency: As per ECBC: 2017:As per ECBC: Not less than 80% Motor for VFD driven pumps shall be suitable for VFD operation with higher grade of winding insulation to take care of heating due to operation at lower frequencies & lower voltages. Make : Grundfos / WILO / Armstrong / KIRLOSKAR

Not less than 240 USGPM / 20-24M Head (2W+1S)

Supply, Installation of Inertia BASE suitable for pump size including of MS Frame, Spring Isolator, Rubber PAD, filling with Plain cement concrete Make : Resistoflex, Easyflex