NCTPS I SE MI circle Boiler Maintenance Division Repair and Maintenance works for the year 24 25 Specification No 164 24 25

Amount

Dismantling the wornout ID fan ‘2A’ shaft & Impeller: 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, consumables and T&P’s.

Renewal of shaft, Impeller & conical cover plate assembling: 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, consumables and T&P’s.

Charges for renewal of worn out wear plates from impeller of ID fan ‘2A’ by mounting of new wear plates in impeller using counter sunk bolts. Including consumables and T&P’s.

Charges for levelling the shaft at Drive End, Non Drive End and impeller side and correcting the levels for perfect alignment including consumables and T&P’s. (ID fan 2A)

Charges for blue matching of 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. 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 2A the work involves: 3mm 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 2A impeller with shaft assembly for balancing purpose from NCTPS-I to Ambattur after balancing Ambattur to NCTPS-I

Charges for Arrangement of fixtures to dismantling of DE gear coupling and dismantling of bearing housing, lifting, shifting and placing of hydraulic unit to convenient place for removing the coupling and bearing. Removal of DE side fan bearing and sealing collars etc. and supporting the shaft assembly on the wooden sleepers. Checking the bearing mounting area, measuring, rectifying the minor defects and polishing, mounting of existing DE bearing / new bearing after heating in the oil / Induction heating to 120 degree and soaking. Mounting of gear coupling to the shaft after heating in the oil bath, assly of sealing collars and oil rings etc. Assembling of bearing housing, resetting of hydraulic unit and positioning of coupling with shaft. Including cost of consumables and T&P’s. (ID fan 2A)

Charges for Loosening the bed bolts for NDE bearing housing and lifting and locking of shaft, arrangement of fixtures, dismantling and removal of housing and bearing checking the bearing mounting area, measuring, rectifying the minor defects and polishing, mounting of existing NDE bearing / new bearing after heating in the oil / Induction heating to 120 degree and soaking and mounting. Including cost of consumables and T&P’s. (ID fan 2A)

Charges for De-coupling / coupling of ID fan motor with voith coupling (Primary side) Including cost of consumables and T&P’s. (ID fan 2A)

Charges for De-coupling / coupling of ID fan motor with voith coupling (Secondary side) Including cost of consumables and T&P’s. (ID fan 2A)

Overhaul of voith coupling 1150SVNL21-18,5.3: Work involves loosening of all mounting bolts, removal of top housing, removal of runner assembly, disassemble the internals, removal of 6 Nos bearings, primary & secondary wheel, inspection & resonance test of blades, replace the wornout parts, reassemble the runner with mounting of 6 Nos bearings, end housing, leading, positioning the runner in the housing. Complete cleaning of oil sump, overhaul of MOP & AOP, scoop tube assembly, renew the ‘O’ rings, remounting the top cover with proper sealing compound and torque tightening of all bolts. Paint outside the voith. Including cost of consumables and T&P’s. (ID fan 2B)

Alignment of ID fan to voith coupling / voith coupling to motor. Including cost of consumables and T&P’s.

KAARTHIKEYAN ENTERPRISES (BID ID -1134257)