NCTPS I Operation circle CA Dn CWPH and its fore bay Unit I II and III Overhauling of B stream cooling water Pumps 1B 2B and 3B BHEL Make Model CW1Q Vertical pump Capacity 16500 m3 per hr Per pump respective Discharge side Butterfly valves Size

Amount

Overhauling of 1 set of Pump Pull Out Assembly of CWP, by removal of flexible coupling, taper coupling, bearing housing with all internals, Motor stool stuffing box, lubricating water line and air vent line; dismantling of bush, seating, drive shaft, spiders, deflector, intermediate shafts, enclosing pipes, muff couplings, pump shaft, delivery taper, pump casing, impeller and cone lock nut; cleaning of all the pump parts, all fasteners; renewal/replacement of new/old rectified spare(s) and reassembling the Pump Pull Out Assembly intact and satisfactory commissioning, including provision of all consumable and Tools and plants

Overhauling of 1 Set of CWP Outer Column Piping assembly upto Bell mouth, by dismantling the Top Support, discharge line spool piece with delivery branch assembly, intermediate pipe supports, bottom column pipe support and bell mouth; Cleaning of all flange spigots and holes; renewal/replacement of new/old rectified spare(s); aligning and reassembling of CWP Outer Column Piping assembly upto Bell mouth and delivery side spool piece, in any one of the CWP 1B/2B/3B, intact and satisfactory commissioning, , including provision of all consumable and Tools and plants complete.

Renewal of rubber Seal in 1600 mm Butterfly valve in Cooling Water pump, renewal of seal clamping pad, rethreading of worn-out threads in the seal mounting disc and clamping the seal with the disc. Checking the open / close operation of 1600 mm butterfly valves of Cooling Water pump. (Rubber seal will be supplied by NCTPS-I/TANGEDCO).

Removal of crank lever from its position by heating, arresting the BFV disc; removal, overhauling and refixing of shaft and sleeve of BFV and reassembling crank lever intact, very hard to operate butterfly valve of any one of the CWP 1B/2B/3B, , including provision of all consumable and Tools and plants and satisfactory commissioning for free operation.

Renewal / replacement of 1 No. of new / old released discharge line spool piece assembly either on BFV side or delivery branch side in any one of CWP 1B/2B/3B, by supporting, dismantling & removal of bolts & nuts; cleaning the matching surfaces and holes; aligning, reassembling of new/old rectified spare(s) on BFV side and tightening of all bolts and nuts, , including provision of all consumable and Tools and plants

Air blasting and cleaning of heavy marine growth in the stop log gate lowering side wall grooves by using air compressor and cleaning the entrapped heavy silt accumulation in order to facilitate free operation of stop log gate within grooves, , including provision of all consumable and Tools and plants , such as, air compressor, Diving regulator, diving spins, cylinder regulator, diving mask, diving dress, weight belt, manila rope, etc., in the fore bay of CWP 1B/2B/3B.

Lifting, leading and lowering the stop log gate, arresting the water (up–o - 11 m) lifting the trash rack, cleaning the debris and lowering the dewatering pump, dewatering and cleaning the slurry; Alignment checking of TWS & bell mouth and lifting the dewatering pump from suction bay; lowering the rectified trash rack in the suction bay, Cleaning, painting of released Stop Log Gate and the TWS cover in any of the forebay of CWP 1B/2B/3B, including provision of all consumable and Tools and plants complete.

Chipping and complete removal of hard Burnacles, silt, sand, etc... found inside the chamber of entire suction bay and discharge line walls upto bend at tunnel end; thorough cleaning and collection of removed debris, proper disposal of all collected debris, by shifting the collected debris to the repair bay by suitable means, transporting suitably and unloading at a remote low lying area within NCTPS-I, as directed by the field Engineers, including provision of all consumable and Tools and plants scaffolding, debris lifting arrangements complete, in any of the CWP 1B/2B/3B.

Overhauling of any one of the Travelling Water Screen assembly in TWS 1B/2B/3B, by complete dismantling upto foot sprockets and plummer blocks, cleaning, related required rectifications, renewal / replacement of new / rectified spares, refixing of foot sprocket with integral tooth and support angles, reassembling intact in any one of the fore bay of CWP 1B/2B/3B. and satisfactory commissioning including provision of all consumable and Tools and plants complete.,

Lifting the trash screen from fore bay for cleaning and rectification in the Trash screen and renewing the damaged part of Nylon Screen rope suitably, by using SS materials and spare nylon rope of same size, after rectification lowering the trash screen in fore bay including cost of SS welding electrodes, cutting electrodes, Nylon rope, consumables and hire charges for T & Ps, in any one of the Trash Screen Assembly of CWP 1B/2B/3B. (Required SS materials will be supplied by TANGEDCO Ltd. Required other consumables such as, SS and Cutting electrodes, Nylon rope are under Contrac’or's Scope of supply to the actual requirement).

Overhauling of a TWS Gear box, by removal of Gear box assembly from its position, after draining the lubricant, dismantling, cleaning, checking of all internals and chain link assembly, renewal/replacement of new/old rectified spare(s), replacement of worn o“t”"O" rings, Oil seals, reassembling, lubricating the chain link assembly, topping up of gearbox lubricant and satisfactory commissioning, including cost of oil seals’ O' rings, consumables and hire charges for T & Ps (Bearings will be supplied by TANGEDCO Ltd., to the actual requirement).

Thorough cleaning and epoxy coal tar painting over all the outer column pipes (both inner and outer surfaces) and other pump parts such as, pump casing, Delivery Taper, Delivery Branch assembly, all spiders and Top support in any of the CWP 1B/2B/3B, including cost of epoxy coal tar paint, including provision of all consumable and Tools and plants complete.

Dismantling existing Rubber expansion bellow by loosening of flange bolts, after applying rust remover or heating by cutting gas, dismantling the Rubber expansion bellow assembly and bring it to the floor. Size 1600 mm size

Cleaning all the loosened bolts and nuts of Rubber expansion bellow with kerosene, cleaning the top and bottom flanges and allied works.

Loading the new expansion joint to the position, providing tie rods, bolts, nuts and tightening all the bolts mounting bolts , nuts and retention plates properly and other allied works.

Drawl of new bellow from stores and devolution of retrieved bellow at Central Stores

Renewal of worn out studs in Top support for CWP seating area & Motor Stool seating area welding removal of existing damaged studs,drilling and tapping and fixing of new studs (SS 316 M30*140mm Studs), metal filling and grinding the welded surface including provision of all consumable and Tools and plants complete.

Removing of rust in the CWP Motor Stool in 1B,2B & 3B area with one coat of protective coating of self priming Epoxy primer (DFT100+10% microns) and two coats of Epoxy HB coal tar paint (DFT 125+10% microns per coat) (Total 350+ 10% microns) using different shades after thorough scrapping with emery sheet with manual labour and as per the direction and satisfaction of the Engineer in charge, the rate including provision of all consumable and Tools and plants complete.

Providing and placing RCC 1:1½:3 using 6MM HBG metal including cost of all materials, lead, lift labour,LWF, vibrating charges and mixing charges excluding the cost of reinforcement etc. complete for damaged concreate of inner surface for discharge line spool piece DB side, BFV side & discharge pipe up to air release valve

MASSVIL ERECTORS