MTPS I TM Unit III Overhauling and gasket renewing of Valves in Feed Water Main Condensate Heater drain drain water and Auxiliary Steam during Unit III AOH 2025 26

Amount

Overhauling of GV 300/250 ATA III gr. MO/HO valve with Bypass valve. Dismantling the valve, cleaning all the parts, checking the seating surfaces, Lapping the gate and seat for perfect blue matching, Reassembling the valve with new self sealing ring and gland packings. Checking and cleaning the actuator thrust base bearing and lubrication to the bearings. (Tag No: FW -11,12 & 19- 3 Nos, VDAS-55-1 No Total– 4 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 surface, Bearings, Lapping the gate and seat for perfect blue matching, Reassembling the valve with new self-sealing ring and gland packings. ( Tag No: DW -9,10,11,12,14 -5 Nos, BD Isolation Valve-1No, AS-9,10,11,12- 4 Nos, Total- 10Nos)

Overhauling of GV 200 / 250 ATA M.O, GV 200 / 600 Class M.O, SCNRV 400,600mm/ 150 Class GV 500,600mm/ 150 Class. Dismantling the valve/NRV cleaning all the parts checking the seating surfaces and actuator bearings, Lapping the gate / seat / flap for perfect blue matching, reassembling the valve with new self sealing ring / bonnet gasket and gland packings. (Tag No: ES – 5 Total – 1 No )

Overhauling of GV, GLV 200 / 40 ATA, HO/MO, SCNRV 250 / 300/ 40 ATA, Control valve 6" x 6" / 300 class, GV 250 / 40 ATA H.O, 2.5”, 4” / 150, 300 class. 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 the valve with new bonnet gaskets and gland packings. (Tag No: MC- 14, 15, 16, 17, 25, MC NRV at Deaerator floor -6 Nos, ES-4 -1No, HD-6, 12, 13 -3 Nos,Total – 10 Nos.)

Overhauling of GV 300/ 16 ATA MO, GV 300/40 ATA HO, GLV 200/ 40 ATA MO, Control valve 10 ” x 10" / 300 class Dismantling the valve, cleaning all the parts of the valve, checking the seating surfaces and actuator bearings. Lapping the gate / seat / disc / flap for perfect blue matching. Reassembling the valve with new bonnet gaskets and gland packings. (Tag No: ES -12 - 1No, MC-21,29,39,40 - 4 Nos, Total – 5 Nos.)

Overhauling of control valve size 4”x2.5”/ 1500 class Dismantling the valve, cleaning all the parts, checking the seating surfaces Reassembling the valve with new Tech seal Bonnet, Tech seal for body, Stack, Gauge and gland packing. Checking and cleaning the Pneumatic actuator and lubrication to the bearings, fixing the actuator on the valve. (Tag No: BFP RC Valve- 3A,3B,3C, Total-3 Nos)

Overhauling of GV/ GLV 1" class 800/1500/ 2500 HO/MO. Dismantling the valve, checking the seating surfaces. Cleaning all the parts. Lapping the disc with seat for perfect blue matching. Reassembling the valves with new gland packings and bonnet gaskets. Tag No: 1) Auxiliary steam to Ejector line drains -2Nos ,2) Auxiliary steam to Gland steam header drain line valves -2Nos, 3) Auxiliary steam to Gland Cooler I line drains- 3 Nos ,4) After HD-34,44&46 line drain -3Nos, 5)BFP A,B & C Discharge and after NRVS - 12 Nos, 6)BFP Discharge vent line - 6 Nos , 7)BFP Discharge header drain - 2 Nos, Total-30 Nos

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- 44,45, 46, 47 – 4 Nos, AS - 39, 40 – 2 Nos. & BFP ACW I/L-3 Nos, Total – 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. Re-assembling 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, 34, 44, CA 5,6, AS - 31-1No & D/A Drain – 1 No. Total – 12 Nos.)

Overhauling 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, GV150/64 ATA HO, 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 No: MC-3, 28, 49 & 50 – 4 Nos, AS- 32 ,54-2 Nos, DW – 13 -1No, VDAS 123, D/A Over flow – 2 Nos , TLOCPB NRV – 2 Nos, TLOCPB I/L & O/L VALVES - 4 Nos, H2CWBP I/L & O/L - 4 Nos. H2CWBP NRV – 2 Nos., Total- 21 Nos)

Overhauling of GV 65 / 300 class , GLV / 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 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: CA 7, 8, 9, 21, 22 –5 Nos DW 72,73,74,75,51- 5 Nos. AS -33, 41, 52, 53,VHCS 59 - 5 Nos, ACW O/L for BFP A, B & C – 3 Nos. TLOC CW I/L & O/L Valves - 6 Nos., Total– 24 Nos.)

Changing the eroded pipe HPH Air Vent line (Orifice plate) Cutting the eroded and punctured pipes with orifice plates line HPH-5, 6 & 7 air evacuation line to FT(1) header line for a length of 400 mm removing the pipes of both sizes of the orifice plate connecting the orifice plate by welding and machining providing the pipes at both sides of the orifice plate and then with the lines by welding and replace orifice plate if necessary.

Cutting the man hole 500 x 600 mm in the Flash Tank No.1 for easy access to inspect the inner side of FT –I and attending to cracks & welding joint leak inside the Flash Tank No.I. a) Cutting the man hole (500 x 600 mm) in the Flash Tank – I for easy access to inspect the inner side of FT-1.

b) Cleaning the Flash Tank 1 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-1 closing the manhole and welding after cleaning the inner side of the Flash Tank-1.

Cleaning and painting:- a) Cleaning and painting of Main Condensate lines from Hotwell to Gland Cooler-I. b) Cleaning and painting of Cooling water and Auxiliary cooling water lines in Turbine area. (Paint Under contractor’s scope)

Cost of Enamel paint

Pure Graphite Die molded Gland Packing Rings to withstand a pressure of 200 Ksc and Temperature of 600oC density between 1.4 - 1.6 gm/cc and carbon content minimum 99.5 % ( Full Ring ) size: 41.3 – 17.2 – 12 mm

Cost of welding electrodes For Item Sl.No.13,14&15

Cost of Cutting Gas for cutting the man hole in the Flash Tank No.1 and Cutting the eroded and punctured pipes with orifice plates line HPH-5, 6 & 7 air evacuation line to FT (1) header.

Consumables and T& P Charges for Item Sl.No: 1 to 15

NEW SRI VENKATESWARA ENGINEERING WORKS (BID ID -1492839)