84204/E8 SPECIAL REPAIR / REPLACEMENT TO CENTRAL AC PLANT AT AF STATION JORHAT UNDER GE (AF) JORHAT

Supply, Installation, Testing, Balancing and Commissioning of Central Air-Conditioning plant and air conditioning systems working on environment friendly R 407C refigerant gas as per scope of work given in the following items and sub items of work to maintain design temperature of 23±5°C and humidity of 60±5% at the given buildings and all as required as per the standard code of practice in the given field. Note: Care has been taken to include all items as per below given scope of works, however in case any item of work civil 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 targetted and optimum performance, the cost of which is deemed to be included in the quoted tender rates against each item and as a whole for the air conditioning of given buildings in this tender. (i) SITC of water cooled scroll chiller Capacity 25 TR - 3 Nos (2 working & 01 stand by) Evaporator leaving temperature 6 degree Centrigrade Evaporator entering temperature 12 degree Centrigrade Cooler fouling factor 0.0001 F.ft2.hr/ BTU (ii) Floor mounted AHU with two blower motor (01 working + 01 spare) as per spec with minimum 20000 CFM - 01 No

(iii) SITC of primary chilled water pumps Centrifugal back pull out, End Suction, Flexible coupled supplied with cast iron housing Bronze Impeller & shaft seals with TEFC motor suitable for 3 phase, 415 V + 10%, 50c/s, AC Power supply mounted on common base frame etc. having spring type isolator primary pump - 12 m head, 120 USGPM - 2 Nos (01 working + 01 standby ) (iv) SITC of condenser water pumps Centrifugal back pull out, End Suction, Flexible coupled supplied with cast iron housing Bronze Impeller & shaft seals with TEFC motor suitable for 3 phase, 415 V + 10%, 50c/s, AC Power supply mounted on common base frame etc. having spring type isolator primary pump - 12 m head, 200 USGPM - 2 Nos (01 working + 01 stand by ) (v) Duct heater of 10 KW (3x3KW+01KW) - 01 No. (vi) SITC of Induced draft FRP Cooling tower with other fittings and Accessories of capacity 65 TR - 01 Set (vii) SITC of chilled water piping with insulation MS Class "C" piping of bore 80 mm & 65 mm with 19 mm thick nitrile rubber insulation with 7 ml thick GC - 40 RM

(viii) SITC of Condenser water piping MS C- class Condenser water piping of bore 100 mm & 65 mm - 50 mtr (ix) SITC of Expansion tank with 6 mm thick MS construction with 6 mm thick XLPE insulation and 0.63 mm aluminium sheet cladding with all valves and accesories connections as per approved drawing of capacity 100 ltrs - 01 Job (x) SITC of HDPE makeup water tank of capacity 500 ltrs - 01 Job (xi) SITC of ball valves, balancing valves, strainers, thermometer, pressure gauge, butterfl;y valve as per requiremenyt at site as per approved drawing. - 1 Lot (xii) Drain piping - GI medium class with 13 mm thick closed cell nitrile rubber as per spec of size 40 mm - 10 RM (xiii) SITC for Air distribution & insulation GI ducting size faqbrication of 20 gauge - 20 Sqm (xiv) Thermal insulation & Accoustic insulation Thermal Insulation with 19mm thick XLPE insulation - 20 Sqm Accoustic insulation with 50 mm thick glass wool + tissue paper + perforated sheet - 20 Sqm (xv) GI Duct damper - 2 Sqm (xvi) Canvas connection - 01 No. (xvii) Fire damper with control panel - 01 No. (xviii) Ultrasonic humidifier - 01 No. (xix) Fresh air arrangement with dampers and louvers for AHU - 1 No.

Dismantling of 3x20 TR (2X 20 TR working & 1X 20 TR as stand by) central AC plant from work site except AC Duct and depositing to MES E/M store yard or any other place complete all as specified & directed.

Taking down old unserviceable LT panels of any size and capacity complete all as specified and directed.

Taking down old unserviceable LT UG cable of any size with bricks protection etc. complete all as specified and directed

Taking down old unserviceable earthing of any type complete all as specified and directed

Design, supply, erection, testing and commissioning KIOSK Indoor type LT feeder pillar box, platform mounted, suitable for 3 phase 4 wire, 500 volts AC supply and having 4 Nos Copper bus bar for distribution system and type tested at CPRI, fabricated in factory having modern fabrication and testing facility which includes seven (07) tanks pre treatment facility comprising of de-greasing, rinsing, de-rusting, rinsing, phosphating, rinsing and passivation followed by powder coated painting (thickness not less than 80 Micron) with approved shade of RAL 7032. The feeder pillar shall be provided with suitable Neoprene rubber gasket to make it completely dust and vermin proof and degree of protection not less than IP-55 and general construction conforming to IS : 13947. The feeder pillar shall be made out of 2.00mm thick CRCA mild steel sheet and 3.00mm thick gland plate duly compartmentalized for each control gear and bus-bar, front door (02 layer) and rear Door (01 layer) opening facility and 4 side slanting canopy type roof on top and mild steel channel (75 MC) base frame at bottom. The feeder pillar shall be provided with ventilation facility in the form of louvers for better heat dissipation. The feeder pillar shall be comprising of the followings (DB 20 AC plant ),

BUS BARS AND INTERNAL CONNECTIONS :- The bus bars shall be made of Copper,500 Amps rated, duly insulated with 1100 Volts grade standard colour coded PVC sleeves and rigidly mounted on suitable size 'F' class insulators of non hygroscopic non combustable, track resistant, high strength FRP/SMC/DMC material. All phase bars and as well as the neutral bars also shall be of required size as per MCCB capacity for all internal connections from main bus bars to switch gears shall be carried out with 1100 Volts grade FR PVC insulated copper wire of suitable size but not less than 1.5 times current carrying capacity of individual switch gears. The extended bars from switch gears to cable alley (for terminating the LT UG aluminium cables) shall be made of aluminium bars having suitable cross sectional area but not less than 1.5 times current carrying capacity of individual switch gears, they shall be duly insulated with 1100 volts grade standard colour coded PVC sleeves, 2 Nos Earthing terminating points shall be provided in the side wall as per standard practice. PROVISION FOR CABLE ENTRY :- The provision for cable entry/exit shall be provided in the bottom for both incoming and outgoing cables. CONTROL WIRING : All control wirings shall have to be carried out with 1100 volts rated FRLS grade PVC insulated multi-flexible type copper wire of cross sectional area 1.50Sqmm and shall be properly bunched, tied and dressed, ferrule marked for proper identification and crimped with suitable size and type of tinned copper lugs and shall be wrapped with PVC spring type tube near the door hinges. INCOMING : 4 pole MCCB having breaking capacity 36 KA of rating 320 Amps. - 01 No

OUTGOINGS :- (a ) 4 pole MCCB having breaking capacity 25 KA of rating 63 Amps. - 3 No (b) 4 pole MCCB having breaking capacity 25 KA of rating 32 Amps. - 8 No (c ) Push button - 16 Nos (d) Single phase preventer 3 Ph, 415 Volt, 50 Hz - 08 Nos (e) 3 Pole contactor 16 Amp AC3 rating, coil voltage 230 V - 24 Nos (f) Thermal overload relay 4-8 Amp - 8 Nos (g) RG indicator, 1 set - 8 Nos INSTRUMENTATION SYSTEM :- (a) Digital multi function panel meter with measuring parrameters VLL, VLN, A, Hz, PF, Var, Harmonics (b) Current Transformer (CT) having ratio 200 / 5, indoor, tape wound, ring type with rated burden 5.0 VA. - 03 Nos. (c) LED Pilot Lamp (for Incomers) suitable for 230/240 Volts AC supply complete with integral circuit & cluster LED of following colours:- (i) RED - 01 No, YELLOW - 01 No, BLUE - 01 No. (d) Danger Notice Plate duly written in Signal Red colour on Aluminium plate in English & Hindi language and of size not less than 150mm x 100mm - 02 No