MTPSI TM I Unit III Annual Maintenance work in Main Turbine its Auxiliaries and Overhauling of Pennwalt Centrifuges 3A 3B during 2025 26

Dismantling, overhauling and assembling of HP & IP Control Valve Columns. Dismantling the control valve columns after loosening the bolts, dismantling its liners, spring assembly liner sliding pin, dismantling the roller bearings, cleaning the above items, inspection of liner key way and measuring the dimension, welding and grinding to the dimension required, greasing the bearing, assembling the dismantled parts and setting the roller clearance as per the direction of engineer in charge.

Dismantling, Inspection and changing of HP & IP Control Valves: Cutting the spindle leak off lines, heating the cap nut of steam chest by gas, dismantling the control valve assembly from steam chest, cleaning of all parts removal of steam strainer and cleaning spare valve and valve seat lapping and checking blue matching, steam chest flange lapping and blue matching, checking valve stem and liner clearance, valve stem DYE penetrant checking etc., Assembling the spare valve with steam chest and tightening the cap nut etc., checking Idle lift connecting the spindle leak off lines and welding as per the direction of the Engineer-in- charge.

Drilling the hole in the stem for providing spilt pin, providing the split pin, checking the washer clearance, checking valve lift etc.

Dismantling, overhauling and assembling of HP & IP Cam Shaft arrangement: Dismantling the cam shaft arrangements from its plumber blocks. Inspection of all bearings, changing the damaged bearings, metal building and machining if required in the bearing seating area, cam inspection and changing the damaged cam. Greasing of all bearings and assembling.

Overhauling of Governing System: Dismantling front pedestal cover, overhauling of main oil pump, intermediate pilot valve, Speed load control assembly, Differentiator, EGPV, turbine trip switch, CVSM feed pack pilot Control pilot & over speed striker. Dismantling of front bearing pedestal top cover, disconnecting the oil pipe lines, dismantling the gear coupling inspection & rectification dismantling of main oil pump, rotor float checking, side and top oil clearance checking. Inspection of impeller, wear ring clearance checking inspection of bearings and doing correction works, replacement of bearings, gear coupling if required. MOP & HP rotor alignment checking and correcting the same and assembling the gear coupling and MOP cover. Dismantling the MOP NRV, lapping and blue matching and assembling, Dismantling, cleaning, inspection and assembling of follow pilot, summation pilot, load/speed control pilot, speeder gear assembly, EGPV, intermediate pilot, differentiator, CVSM feedback pilot etc., Speed governor sleeve to nozzle, EGPV lever to over speed striker to rubber.

Dismantling the Bearing cover, checking the Bearing Interference and assembling after C & I work: Dismantling the bearing cover by loosening the cap nuts, checking the bearing to cover Interference attending correction if any and assembling after cleaning the parting plane and after completion of C & I works.

Dismantling, overhauling and assembling of Barring Gear assembly: Dismantling of barring gear assembly, oil pipe lines, hand wheel assembly, semi coupling of motor, worm cover, worm of barring gear, worm wheel cover, worm shaft lever, removing and inspection of bearings, correction of key ways in worm shaft, inspection and renewal of pressing bush, gland bush and renewal of oil seals, bearings, assembling and coupling alignment etc.

Checking the hot governing characteristics and adjusting the valve openings as per the instruction of Engineer in-charge including tools and tackles.

MOT Filter Cleaning: Charges for main oil tank filters cleaning including dismantling of filter cover plate, lifting of filters, cleaning of filters by air, inspection of Filters and assembling of Filter Cover plate, cleaning of spillage oil in and around the Main oil tank.

Inspection and cleaning of ESV/IV Pilot valve: Checking the necessary clearances in the pilots with liners and assembling with renewal of wornout spares.

Renewal of LPT diaphragm: Removal of old gasket, cutting new gasket to the existing contour and renewing the new gasket and complete tightening of outer rings.

Inspection and Cleaning of MOT: Draining the oil to clean oil tank through centrifuge, Removal of MOT strainers, Cleaning the tank after removing the slag, Drawl of new oil and devolution of empty barrel, Topping up of oil from clean oil tank through centrifuge.

CENTRIFUGE OVERHAULING–PENNWALT: a) Charges for Dismantling of inlet and outlet oil lines connected to oil pumps and heater tank & cleaning etc.,

b) Charges for dismantling of Suction pump assembly, cleaning all internals, renewal of Bearings, oil seals, oil gaskets and assembling etc.,

c) Charges for dismantling of discharge pump assembly, cleaning of internals, renewal of Bearings, oil seals, oil gaskets and assembling etc.,

d) Charges for Dismantling Centrifuge Belt guard, centrifuge Bowl assembly, bottom feed nozzle assembly, idler arm assembly, bearing complete assembly, cleaning, inspection, renewal of bearings, gaskets, bushes and assembling work etc.,

e) Charges for renewal of existing oil line valves, gaskets and assembling of oil lines etc.,

Charges for Consumables and T&P’s item for Sl.No:1 to 17