MTPS I TM Unit I Overhauling of Valves in Feed Water Main Condensate Extraction Steam Auxiliary steam and Drain Water lines during Boiler License Renewal Work 2020 21

Amount

Overhauling of GV 250 /250 ATA III Gr. MO with Bypass Valve: Dismantling the valve, cleaning all the parts, checking the actuator bearings, seating surfaces. Lapping the gate and seat for perfect blue matching, reassembling the valve with new self sealing ring and gland packing. Checking and cleaning the actuator thrust base bearing and lubrication to the bearings. (Tag No: BFP Discharge valves 1A,1B and 1C -3 Nos. Total –3 Nos)

Overhauling of GV 10"/1500 Class HO and PNRV 250 / 250 ATA , SCNRV 300 /150 Class, GV/GLV 10 “/150 class, 12 “/150, 300 class. Dismantling the valve, cleaning all the parts, Checking the seating surfaces. Lapping the gate/seat & flap/disc for perfect blue matching. Reassembling the valves with new self sealing ring and bonnet gaskets and gland packing rings. (Tag No: BFP Suction valve 1A, 1B & 1C - 3 Nos. and BFP Discharge NRV- 1A , 1B & 1C – 3 Nos. Total – 6 Nos)

Overhauling Of GV 100/250 ATA IX Gr M.O, GLV 4” Class 2500 M.O. Dismantling the valve, cleaning all the parts, checking the seating surfaces and actuator bearings. Lapping the gate and seat for perfect blue matching, Reassembling the valve with new self-sealing ring and gland packings. (Tag No. MSSV By Pass Regulation & Isolation Valves - 4 Nos.)

Overhauling of GLV,50mm,1500class FAS,SW,HO/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 No: DW - 9,10,11,12, BFP RC Isolation A, B, C, BFP RC NRV- A,B & C, AS- 7, 8, 42 -3 Nos –Total-13 Nos)

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-5,6,Total– 2 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: MC- 11,12- Total -2 Nos.)

Overhauling of GV / GLV 2" class 800, 1500, 2500 HO/MO valves Dismantling the valve, cleaning all the parts, Lapping the gate, disc with seat, for perfect blue matching. Reassembling the valve with new bonnet gasket and gland packings. (Tag No: MSL Drain: 2 Nos., HRH Drain: 2 Nos., CRH Drains: 4 Nos, ES-20 & 21- 2 Nos, HPT Transfer pipe drains- 4 Nos –Total 14 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: Drain line valves in MSL lines, HPT Transfer pipe lines, MSSV to ESV lines, BFP Discharge lines and header, HP Heaters Feed water inlet and outlet lines, HP Heaters coil vents- 20 Nos)

Changing of CRH (Left and Right) line flange and dummy flange gaskets. a) Providing the scaffolding arrangements. Disassembling the CRH line flange studs and dummy flange bolts. Removing the spacer flange for inspection. b) Cleaning the spacer flange at both sides and mating surface of the line flange, Dummy flange. Providing the gaskets and positioning the spacer flange, Reassembling the CRH line flange and dummy flange by tightening the studs / bolts without any leak.