MTPS I TM Unit IV Overhauling of valves in Heater Drain Pegging Steam to Deaerator Condenser air Auxiliary steam and Drain Water lines in Unit IV during AOH 2020 21

Amount

Overhauling of GV 200 / 64, 40, 16 ATA GV 150/ 250 ATA MO Dismantling the valve, cleaning all the parts, checking the gate / seat surfaces, Lapping the gate/seat for perfect blue matching. Reassembling the valve with new self sealing ring, gland packing’s rings without any leak, Checking the Actuator thrust base bearing and apply lubrication. ( Tag No. HD- 46, 47 – 2 Nos. AS - 39, 40 – 2 Nos. & BFP ACW I/L-3 Nos, Total – 7 Nos)

Overhauling of GV 100 / 250 ATA III Gr. HO, GV 65 /250 ATA III Gr. MO/HO, GV 2.5”, 4" 2500 Class HO/MO valves Dismantling the valve, cleaning all the parts, checking the seating surfaces. Bearings. Lapping the gate and seat for perfect blue matching, Reassembling the valve with new Self Sealing ring and gland packings Tag Nos. (Tag Nos. VDAS 122,123, AS- 7, 8, 9, 10, 11, 12, 42 -9 Nos.)

Overhauling of GV 150/64, 40, 16 ATA HO, GV 6 "/ 600, 300, 150 class HO, GLV 150 /40 ATA , GLV 6 ” / 300 class HO/MO, SCNRV 200/40, 16 ATA. Dismantling the valve, cleaning all the parts, checking the seating surfaces, bearing, yoke bush etc., Lapping the gate/seat/disc/flap for perfect blue matching. Reassembling the valve with new gland packing rings and bonnet gaskets without any leak. Checking the Actuator thrust base bearing and apply lubrication. (TAG No. HD 16, 17, 18, 19, 20, 21, 48, 50, 51, 53 -10 Nos. CA- 05, 06 - 2 Nos., AS - 31-1No, Total – 13 Nos.)

Overhauling of PNRV 100/250 ATA , GLV 100 /40 , 16 ATA,GLV 4” / 600, 300 class HO / MO,SCNRV 150/ 40, 16 ATA, SRV 2.5 ” X4 ” / 300 Class, GV 350/125 class & GV 300/125 class, SCNRV 350/125 class Dismantling the valve, cleaning all the parts, checking the seating surfaces, bearing, yoke bush etc., Lapping the gate/seat/disc/flap for perfect blue matching. Reassembling the valve with new gland packing rings and bonnet gaskets without any leak. Checking the Actuator thrust base bearing and apply lubrication. (TAG Nos. HD-49,52-2 Nos,DW–13, 73, 74 - 3 Nos, , TLOCBP I/L & O/L Valves - 4 Nos, H2CWBP I/L & O/L valves - 4 Nos Total- 13 Nos)

Overhauling of GV 65 / 300 class, GV 50 / 64, 40 ATA, GLV 2" / 800, 1500, 2500 class HO / MO, SCNRV 100 / 16 ATA and GV, GLV 200 / 125 class. Dismantling the valve, cleaning all the parts, checking the seating surfaces, bearing, yoke bush etc., Lapping the gate/seat/disc/flap for perfect blue matching. Reassembling the valve with new gland packing rings and bonnet gaskets without any leak. Checking the Actuator thrust base bearing and apply lubrication. (TAG No: CA-7, 8, 9– 3 Nos, DW 72, 75 - 2 Nos., AS-52, 53, VHCS- 59 - 3 Nos,. TLOC CW I/L & O/L Valves - 6 Nos., Total – 14 Nos.)

Overhauling of Control valve 6"x 6", 4”x4”, 2.5”/2.5” /150, 300 class. Dismantling the valve, cleaning all the parts, checking the seating surfaces of Gate/seat/ disc/ flap, bearing yoke bushes thrust base of the actuator etc.. Lapping the seating surfaces of gate/ seat/disc / flap for perfect blue matching. Reassembling the valve with new gland packing rings and bonnet gaskets without any leak. Checking the Actuator thrust base bearing and apply lubrication Tag No: HD-6, 14, 15, D/A Pressure control valve – 4 Nos.)

Overhauling of GV/GLV 1" / 800, 1500, 2500 class HO/MO. Dismantling the valve, cleaning all the parts, checking the seating surfaces and actuator bearings. Lapping the gate / seat /flap for perfect blue matching, Re-assembling thevalve with new bonnet gaskets and gland packings. (Tag No: Drain line valves in Heater Drip to Flash Tank, Heater Drip Cascading lines, Extraction Steam lines to Flash Tank, Auxiliary steam to Ejector lines and GC-1 Header, HP Heaters Shell drains and Shell vents – 25 Nos.)

Cutting the man hole 500 x 600 mm in the Flash Tank No. I&II for easy access to inspect the inner side of FT –1&2 and attending to cracks & welding joint leak inside the Flash Tank No.1&2 a) Cutting the man hole (500 x 600 mm) in the Flash Tank – I & II for easy access to inspect the inner side of FT-I &II. b) Cleaning the Flash Tank- I & II grinding the cracked portion inside the tank bottom and middle welded joint and nozzle header joints etc. as per requirement and making ‘V’ grooves and welded the portion. c) Grinding the manhole edge of the plate and Flash Tank- I & II closing the manhole and welding after cleaning the inner side of the Flash Tank- I & II (Tag No: flash tank-1No)