NCTPS I ES Circle EM I Division S Dn V Generator Maintenance Annual Overhaul works of Generator and it auxiliaries in Unit I II III for the year 2024 25

Amount

I. Hydrogen Gas System Works Purging of H2 gas in TG casing.

Conducting Air Tightness Test and attending minor leaks of H2 gas system. (Before purging & after filling H2 gas).

Filling of H2 gas in TG casing.

Drying out the stator winding by circulating hot air and puffing work

Revisioning of hydrogen gas dryer (Both East dryer and West dryer)

Revisioning of Turbo Generator Bottom manhole cover & inside side covers and inspection & cleaning of inside casing bottom.

II. Brush Gear Assembly Works Dismantling brush gear cable, removing the carbon brushes, brush holders, releasing the brush gear assembly and cleaning the same.

Re-fixing the brush gear assembly, aligning the radial clearances, re-fixing the brush holders, carbon brushes and brush gear cable.

III. (A) Stator Water System Works Dismantling lifting and loading the polishing unit from 4.5 Mtr. Area to DM plant for regeneration of the resin, dismantling of outlet flanges, cleaning of the mesh and reassembling with new gaskets, and back to its original position including required material charges and hire charges for tools and plants.

Revisioning of Expansion Tank.

Complete cleaning of Expansion Tank Float Valve.

Revisioning of Stator Water Filter

Revisioning of Magnetic Filters

III. (B) Stator Water Pump Charges for stator water pump overhauling

Supply of shaft for KSB pump, IS 5517 for stator water pump, part. No.210

Supply of shaft protection sleeve for KSB pump ltd, IS 5517 for stator water pump

Supply of spares for EBI mechanical seal, type P01, d20 as per drawing No.K006/D3199-11/R1 for stator water pump (Motor CPK-CM-50 200)

Supply of NU 305 bearing make:SKF

Supply of 7209 bearing make:SKF

Stator water pump and motor & stator water vacuum pump and motor alignment.

IV. Seal Oil System Work Annual maintenance work in seal oil tank & filter dismantling of top cover and inside fixtures in SOT, cleaning of the tank, checking the float valve assembly, refixing the inner fixtures and assembly of top cover dismantling of filters, cleaning the simplex and duplex filter elements, reassembling the filters complete.

Dismantling of top water box, lifting the tube nest cleaning of top and bottom water box & outer shell, cleaning of all flange seating areas, positioning the tube nest and hydraulic testing of tube nest & providing new oil and water gaskets, assembling and tightening of all parts.

V. Valve Overhauling Dismantling, Rectification, overhaul and reconnecting one number (25NB/ 40NB/ 50NB) Globe valve /NRV.

Dismantling, Rectification, overhaul and reconnecting one number (80NB / 100NB) Globe valve/NRV.

VI. Electrical Panel Work Cleaning of all the modules with IPA, cleaning & healthiness checking of power Contactor tips and replacing if necessary, terminal tightness of all components, and refixing the modules in the respective panels.

Consumable

GV ELLAIYAN CONTRACTORS