MTPS I TM I Breakdown Maintenance work in Main Turbine and its Auxiliaries in Unit I to IV during 2020 21 for the period of 120 Days

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: 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., a). 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, 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 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

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

CENTRIFUGE OVERHAULING –ALFA LAVAL: a) Dismantling of oil inlet and outlet pipe lines to centrifuge, dismantling of motor, break drum, bowl assembly and pump assembly. Cleaning, inspection, Renewal of damaged spares, bearings, oil seals and assembling, successful commissioning of the centrifuge.

b).Cleaning of Oil line, renewal of oil line gaskets and painting etc

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 all 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.,

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 includes checking the necessary clearances in the pilots with liners and assembling with renewal of worn out spares.

Flushing of ESV/IV cooling water hoses and checking leakages if any.

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 of coupling, Bearing and mechanical seal in AC lub Oil/ DC/ AC/DC seal oil pumps pump. Dismantling of bearing and mechanical seal assembly and renewal if required and assembling.

NELLAI ENTERPRISES