NCTPS I SE MI circle Boiler Maintenance Division Annual Overhaul work for the year 25 26 Specification No 242 25 26

Amount

Opening all the manhole doors in 7.5 mtr. and roof top of ESP, Mechanical cleaning and water washing the fields in ESP including collecting plates, emitting electrode rapping mechanism and structures inside the ESP and ESP hoppers, and closing all the manhole doors including the cost of asbestos ropes for doors completely. Including consumables and T & P's.

Overhaul inspection of Collecting Electrode Rapping Mechanism (A & B Streams): This work includes inspection of CERM rapping shaft, inner & outer arm, plain bearings, set rings and gear box assembly and its clutch & coupling, shock bar, attending minor repair works in the CERM. Renewal of gear box oil. Including consumables and T & P's.

Overhaul inspection of Emitting Electrodes Rapping Mechanism (A & B Streams): The work includes inspection of EERM shaft insulators, vertical and horizontal shaft, pin wheel, plain bearing, thrust bearing, inner and outer arm and attending minor repair works. Cleaning and inspection of shaft insulator with C.T.C. Renewal of gear box oil. Including consumables and T & P's.

Rectification of Emitting electrode suspension frames in ESP field: Work involves complete inspection at height of 13.5 mtr of emitting coil hook frame, cleaning of eroded and damaged portion of hockes, rectification of damages by welding and strengthening of frames as directed by Engineer in charge, Including cost and consumables.

Rectification of inspection ladder in ESP field: Work involves complete inspection up to height of 13.5 mtr of ladder, cleaning of eroded and damaged portion of ladder rectification of damages by patch welding and strengthening of ladder as directed by Engineer in charge. Including cost and consumables.

Reconditioning / Renewal of pocking pipes: Work involves cutting and removal of damaged pocking pipes, gauching, edge preparation, erection of new pocking one. Including drawal& devolution, Including cost and consumables. (The Required material will be supplied by TNPGCL)

Replacement of ESP inspection door: Work involves disconnecting the handle lever and dismantling the inspection door and fixing of new inspection door, bolting the handle lever and clamping. Including consumables and T & P's. (The Required material will be supplied by TNPGCL)

Fabrication and fixing of corroded & damaged shaft insulators inspection door frame: Work involves cutting and removal of corroded and damaged shaft insulator inspection door frame, edge preparation, fabrication of new frame & fixing and complete welding, Including consumables and T & P's.

Charges for renewal of support / shaft insulators: Work involves locking the field frame, releasing of lock nut and support insulator. Fixing of new insulator, bolting, releasing field and aligning. Including consumables and T&P's. (The Required material will be supplied by TANGEDCO)

Checking the condition and measuring the thickness of collecting electrodes per field. Including consumables and T & P's.

Charges for checking, replacing/Reconditioning of worn out/bent shock bar guides both front and rear wherever necessary, Including consumables and T & P's.

Charges for checking, replacing worn out shock bar after providing necessary scaffolding arrangements. Including consumables and T&P's.

Charges for checking, replacing of wornout pin wheel assembly. Including consumables and T & P's.

Charges for checking, replacing of worn out plain bearing in CERM and EERM horizontal shafts etc. Including consumables and T & P's.

Checking the condition and measuring the thickness of emitting electrodes per field. Including consumables and T & P's.

Checking the rapping mechanisms both emitting and collecting replacing/re-conditioning of eroded tumbling hammers. Including consumables and T & P's.

Reconditioning the collecting electrodes by patch welding etc., completely. Including consumables and T & P's. (The Required material will be supplied by TNPGCL)

Charges for bend removal by hot correction including cutting gas, labour, scaffolding arrangements etc.,8 Nos. collecting electrodes should be hot correction per shift. Including consumables and T & P's.

Charges for strengthening of eroded ESP internal structure and transporting Angles from Central Stores / NCTPS, cutting into required size leading lifting, positioning and welding. Including consumables and T & P's. (The Required material will be supplied by TNPGCL)

Charges for dismantling EERM grip coupling, bearing housing, shaft, bearing & checking the bearing, bush, shaft, and renewal of worn-out bearing, reconditioning / replacing shaft, re-assembling. Including consumables and T & P's.

Charges for one coat of painting the gear boxes and all inspection door with enamel paint. (Including cost of paint). Including consumables and T & P's.

Charges for cleaning ash deposit in support / shaft insulators inside the ESP, Including consumables and T & P's.

Charges for cleaning the accumulated ash inside the ESP hoppers, Including consumables and T & P's.

Charges for renewal / reconditioning of 1 No. flange at bottom of hopper, man hole doors, poking hole, heating chamber, provided & removal of working platforms on hopper and related equipment including the cost of welding electrodes. Including consumables and T & P's.

Charges for Overhauling of man hole door assembly in Boiler / ESP by cleaning, inspection of pins, studs, bolt & nuts, lever, operation freeness, replace the sealing asbestos rope etc., and rectification of defects if any, Including consumables and T & P's.

Charges for renewal / reconditioning of fallen Deflection plates over the primary / secondary screen plates. his work involves providing scaffolding arrangements leading and positioning and fixing the deflection plates. Including consumables and T & P's. (The Required material will be supplied by TNPGCL)

Charges for dismantling, renewal of bearings & Gears and internals, reassembling of CERM gear boxes. Including consumables and T & P's.

Charges for replacing the worn out CERM /EERM shafts with structure, tumbling hammers, plain bearings with necessary scaffolding arrangements. Including consumables and T & P's.

Renewal of Collecting Electrode Shock Bar pad: Work involves cutting and removal wornout shock bar pad and erection new one and bolting with shock bar. Including drawal& devolution. Including consumables and T & P's. (The Required material will be supplied by TNPGCL)

Charges for cleaning & Water washing the boiler ESP ground floor area during overhauling of Boiler ESP. Including consumables and T & P's.

Charges for shifting of eroded / damaged ESP collecting electrodes & emitting electrodes from 23M elevation to ESP '0' mtr elevation and cutting into 4 to 5 pieces and loading it to the vehicle and devolution to central stores.

Reconditioning of damaged ESP collecting electrodes by gas cutting and remaining of damaged bottom portion up to 1 to 1.5mtrs length, connecting of new / good condition ESP collecting electrode upto 1 to 1.5mtrs length in place of damaged portion removed from existing collecting electrode in service and maintaining 13.5mtr height by using with fasteners, this work involves 2 nos slots cutting for positioning arresting by fasteners at the bottom and 2 nos corner square portion removal as like in original collecting electrodes.

Rectification of defective CERM gear box: Work involves dismantling of gearbox assembly completely. Replacing the worn out pinion gear, main drive gears, bearings and oil seal; Reconditioning of 1st stage, 2nd stage, 3rd stage gears and its shafts assembling completely and painting. Including the cost of gears, consumables, T&P’s and transporting charges etc.

LOKESH ENGINEERING (BID ID -1520299)