MTPS I TM I Unit III Annual Maintenance work in Main Turbine and its Auxiliaries during Boiler license renewal 2020 21

Amount

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: a). 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. b). 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.

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.

Turbine Lub Oil Cooler - Attending Tube Puncture: a).Dismantling of top water box, cleaning of all tubes, lifting & hydraulic testing of tube nest, plugging of punctured tubes, cleaning of top and bottom water box, cleaning of all flange seating areas, providing new oil and water gaskets, assembling and tightening of all parts. b).Draining of oil from TLOC, shifting oil barrels, top up oil to MOT through centrifuge etc.

Seal Oil Cooler - Attending Tube Puncture: a). Draining of oil from SOC, shifting oil barrels, after attending hydraulic testing of tube nest top up oil to MOT through centrifuge etc. b). Attending tube puncture in seal oil coolers. Dismantling of top water box, brush cleaning of all tubes, hydraulic testing of tube nest, plugging of punctured tubes, cleaning of top and bottom water box, cleaning of all flange seating areas, providing new oil and water gaskets, assembling and tightening of all parts and charging of oil & water side etc.

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.