NCTPS I SE MI circle Boiler Maintenance Division Annual Overhaul works for the year 24 25 Specification No 189 24 25

Amount

Dismantling of wornout ID fan shaft & Impeller for 3A & 3B: Work involves Loosening of all the bolts and removal of all bolts and nuts, gas cutting if necessary and dismantling the top quadrant portion of casing, dismantling the seals, removal of shaft and impeller assembly by proper slinging and placing over the stand. Removal of shaft with impeller assly after loosening all the bolts and gas cutting of conical cover plates and thin bolt covering disc plate. Including devolution and transportation, Including cost of consumables and T&P’s.

Renewal of shaft, Impeller & conical cover plate assembling for 3A & 3B: Work involves Refixing the new shaft into the impeller hub by proper matching, torque tightening of impeller bolts, tack welding the bolts with the shaft, mounting the conical cover plate, bolting and torque tightening the cover plate bolts and welding of bolt head cover plate inserting the entire shaft impeller assembly without damaging, edge preparation in the flanges and refixing the top quadrant portion of casing, seals, refixing of all bolts, renewal of asbestos rope in casing flanges and tightening of all flange bolts and normalizing Including drawal, devolution, transportation, cost of consumables and T&P’s.

Charges for renewal of worn out wear plates from impeller of ID fan 3A & 3B by mounting of new wear plates in impeller using counter sunk bolts. Including consumables and T&P’s.

Charges for 3A & 3B leveling the shaft at Drive End, Non Drive End and impeller side and correcting the levels for perfect alignment including consumables and T&P’s.

Charges for blue matching of ID fan 3A & 3B Drive end and Non Drive end bearing with shaft and assembling. Then mounting the outer casing from ground level to top of shaft assembly. Including consumables and T&P’s.

Charges for dynamic balancing of shaft assembly for 3A & 3B: Work involves shaft assembly is loading to balancing machine and thoroughness checking, and taking initial vibration and analyse the unbalance of shaft assembly, bring down the vibration level to the satisfactory operation at the rate of speed 900 RPM by adding trail and actual weight and welding. Including consumables and T&P’s.

Charges for fabrication of radial seals of ID fan 3A & 3B the work involves: 3 mm plate cutting, grinding, making holes and bending to suit radial seal fixing frame at both DE / NDE side required materials issued by TANGEDCO at free of cost. Including consumables and T&P’s.

Charges for transporting of ID FAN 3A & 3B impeller with shaft assembly for balancing purpose from NCTPS-I to Ambattur after balancing Ambattur to NCTPS-I

KAARTHIKEYAN ENTERPRISES (BID ID -1187188)