NCTPS I SE MI circle Boiler Maintenance Division Annual Overhaul works for the year 24 25 Specification No 160 24 25

Amount

Disconnecting the gear couplings at motor and fan ends, opening of all man hole doors. Water washing the impeller, suction, spiral casing and delivery chamber. Cleaning the gear coupling, inspecting and replace the wornout bolts. Opening the bearing housings, taking radial clearance of bearings and its condition. Cleaning the housing, end cover, bolts, base bolts, replace the wornout bolts and provide a new gaskets. Dismantle the labyrinth seal and renew the gaskets. Checking the condition of the shafts at bearing seating area. Di-penetrate test at welding joints. Including cost of consumables and T&P's.

Inspection of ID Fan shaft impeller mounting flange weldings by opening the conical cover plate : Work involves gas cutting of cover plate, loosening of bolts of conical cover plate, dismantling of conical cover plates, cleaning of ash & rust at shaft flange weldings, DPT of weldings, remounting the conical cover plate, bolting and providing cover plate and welding, normalizing. Including cost of consumables and T&P's.

Overhaul of Lub oil Lines: Drain the working oil, dismantle the oil lines. Draining oil from coolers, opening the end covers. Dismantle the NRVs in AOP and MOP end inspection, cleaning and refixing. Boxup the oil lines with proper gaskets after completion of all works and fill the working oil. Trial run of AOP. Including drawl, devolution, transportation. Including cost of consumables and T&P's.

Charges for cleaning and dismantling of ID fan Coolers. Including cost of consumables and T&P's.

Charges for assembling of ID fan Lub oil coolers. Including cost of consumables and T&P's.

Charges for hydraulic testing of ID fan lub oil coolers @ 15 Kg/Cm2 pressure for 30 minutes in the presence of Board Engineer. Including cost of consumables and T&P's.

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.

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. (The Required Material will be supplied by TANGEDCO)

Lifting, leading and erecting the overhauled voith coupling in its location in ID Fan and connecting its accessories lub oil lines etc. Including cost of consumables and T&P’s.

Alignment of ID fan to Voith Coupling / Voith Coupling to Motor. Including cost of consumables and T&P’s.

Removal of existing radial seals (L & R) by loosening of bolts and renewal of new radial seal / existing removed radial seal (after reconditioning) and bolting, adjusting the radial seal for required clearance and tightened and tack welding. Including cost of consumables and T&P’s. (The Required Material will be supplied by TANGEDCO)

Rectification of damaged portions in ID fan casing: This work includes complete cleaning of casing patch up by fabrication and fixing of M.S. plate required size at damaged portions in fan casing and welding. Including cost of consumables and T&P's. (The Required Material will be supplied by TANGEDCO)

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 torgue tightening of all bolts. Paint outside the voith. Including cost of consumables and T&P's.

KAARTHIKEYAN ENTERPRISES (BID ID -1136719)