NCTPS I SE MI circle Boiler Maintenance Division Annual Overhaul works for the year 24 25 Specification No 67 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 nd 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.

Renewal of DE Bearing: The Work involves arrangement of fixtures 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 DE 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. (The Required Material will be supplied by TANGEDCO)

Renewal of NDE bearing: Work involves lifting and locking of shaft, arrangement of fixtures, removal of housing and bearing. Heating of new bearing in the oil/Induction heating to 120degree and soaking and mounting. Including drawl, devolution and transportation. Including cost of consumables and T&P's. (The Required Material will be supplied by TANGEDCO)

Charges for removal of worn out wear plates from impeller (11 Nos) of ID fan by heating the bolts or gas cutting, cleaning the area of impellers, drawl of new wear plates and counter sunk bolts from central stores, mounting of new wear plates in impellers using counter sunk bolts. Removal of worn-out wear plates in one ID fan. Including cost of consumables and T&P's. (The Required Material will be supplied by TANGEDCO)

Mounting of new wear plates in impellers of ID fans. Including cost of consumables and T&P's. (The Required Material will be supplied by TANGEDCO)

Opening of voith coupling oil tank cover, drain the working oil, cleaning and checking the internals and closing the cover and renewal of working oil including cleaning the oil filters. 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.

Renewal of impeller radial seal: Work involves removal of existing eroded radial seals (L&R) by loosening of bolts, and fixing of new radial seal bolting and tack welding. Adjusting the radial seal for required clearance. Including drawal, devolution, transporttion. 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 fabfrication and fixing of MS 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)

Charges for one coat of painting the Fan housing, Lub oil lines, coolers, Voith, Acw Lines and all inspection door with enamel paint (including cost of paint), Including cost of consumables and T&P's

KAARTHIKEYAN ENTERPRISES (BID ID -1066083)