NCTPS I SE MI circle Boiler Maintenance Division Annual Overhaul works for the year 24 25 Specification No 243 24 25

Amount

Emitting Electrodes suitable for Type: FAA-6 x 37-5-2 x 96135-2 (Required Qty per ESP field = 1440 nos. Hence, Qty for 2 nos of ESP field = 2880 nos)

Removal of ESP outer casing roof plate by gas cutting, lowering it to "0" mtr and lifting the same to ESP top roof after renewal of collecting electrodes, refixing of outer casing roof plates by fit up, alignment and welding at 23 Mtr elevation. The opening is to be cut for enabling to remove the 750 mm width x 13.5 Mtr length electrode including consumables and T&P’s. (Required Qty per ESP field = 80 M2. Hence, Qty for 2 Nos of ESP field = 160 M2)

Removal of insulation from ESP top roof at 23 Mtr elevation. Cutting into required size and welding insulation hook, retainer plates applying double layer of insulation, fixing GI strips and binding with wires etc., Including consumables and T&P’s. (Required Qty per ESP field = 80 M2. Hence, Qty for 2 Nos of ESP field = 160 M2)

Cutting ESP inner casing roof plates and connected structural steel supports to the required size and leading it to ground level and providing necessary scaffolding arrangements of inner casing roof is to be cut & opened for enabling the removal of collecting electrode of size 750 mm width x 13.5 Mtr length, including consumables and T&P’s. (Required Qty per ESP field = 80 M2. Hence, Qty for 2 Nos of ESP field = 160 M2)

Lowering MS plate/ inner casing plates to zero meter, lifting the MS plates after renewal of collecting electrodes to ESP top 23 Mtr elevation, fixing of MS plates at inner casing roof in correct position and welding 3 M² area inner casing is to be refixed after replacing the 5 nos of collecting electrodes., including consumables and T&P’s. (Required Qty per ESP field = 80 M2. Hence, Qty for 2 Nos of ESP field = 160 M2)

Dismantling & removal of damaged/eroded/ wornout ESP collecting electrodes (plates) of sizes of size 750 mm width x 13.5 Mtr from ESP fields. These collecting electrodes are to be dismantled from shock bars by cutting the shock bar bolts, nuts, necessary scaffolding are to be erected at required elevation for lifting the 15 m long electrodes to the top of the ESP roof. Necessary Derrick/JIB crane arrangements are to erected at a suitable place. Data for 4 nos of collecting electrodes can be removed in 1 shifts. Including consumables and T&P’s. (Required Qty per ESP field = 160 Nos, Intermediate plate = 5 Nos. Hence, Qty for 2 Nos of ESP field = 325 Nos)

Transporting collecting plates of size 750 mm width x 13.5 Mtr length from central stores/from stock yard in NCTPS-I loading on the vehicle, transporting through Trailers and unloading with cranes at ESP ’0’ mtr level, including consumables and T&P's. (Required Qty per ESP field = 160 Nos, Intermediate plate = 5 Nos. Hence, Qty for 2 Nos of ESP field = 325 Nos)

Modification of 1 No collecting electrodes from 15 mtr to 13.5 mtr and making huck bolt holes by using trimming special tools suitable for ESP Type: FAA-6 x 37-5-2 x 96135-2 including consumables and T&P's. (Required Qty per ESP field = 160 Nos, Intermediate plate = 5 Nos. Hence, Qty for 2 Nos of ESP field = 325 Nos)

Reconditioning of damaged collecting electrode hooks: This works involves reconditioning of damaged / bent / sheared collecting electrode hooks by gas cutting, fabrication and refixing of new hooks to its original position and welding to complete, including consumables and T&P's. (Required Qty per ESP field = 50 Nos. Hence, Qty for 2 Nos of ESP field = 100 Nos)

Re-erection of ESP collecting electrodes of sizes of 750 mm width 13.5 Mtr length, this work involves additional support frames to be provided inside the ESP fields to guide and position properly in the guide bar assembly. The ESP collecting electrode are to be lifted (By Nos using specially fabricated Jigs/Fixtures) from ‘0’ M to the top of the ESP roof 23 Mtr level and lowered into the ESP fields through the ESP casing openings without bending / twisting / damage with the help of Derrick / JIB crane. The collecting electrode are to be bolted with the shock bar assembly including consumables and T&P’s. (Required Qty per ESP field = 160 Nos, Intermediate plate = 5 Nos. Hence, Qty for 2 Nos of ESP field = 325 Nos)

Renewal of wornout / elongated emitting electrode (Spring type coils) from its frame and fixing of new one using fabricated special stretching tools including consumables and T&P’s. (Required Qty per ESP field = 1440 Nos. Hence, Qty for 2 Nos of ESP field = 2880 Nos)

Shifting / transporting the dismantled and eroded / damaged ESP internals (such as shock bar, collecting / emitting electrodes, plain bearing, rapping shafts for casing plates etc.,) from ESP 23 Mtr to '0' Mtr and loading into vehicle, transporting and devoluting at NCTPS-I stores including consumables and T&P’s. (Required Qty per ESP field = 1 No. Hence, Qty for 2 Nos of ESP field = 2 Nos)

THIAGARAJAN ENGINEERING CONTRACTOR (BID ID -1250258)