MTPS I TM Unit IV Overhauling of Valves in Feed Water Main Condensate and Extraction Steam lines during Annual Overhauling work 2023 24

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.

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.

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.

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.

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.

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.

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.

Overhauling of NRV 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.

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

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.

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 du mmy flange by tightening the studs / bolts without any leak.

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.

Cleaning and painting:- Cleaning and painting of Main Condensate lines from hotwell to Gland Cooler-I.(Bus Green-Paint Under contractor scope)

Enamel paint.

Champion Make Style – 54 Super Metallic Compressed Asbestos fiber Jointing sheet confirm to IS 2712/1998, Grade W/1, Size 2000 x 1500 x 4mm for CRH (L&R) Flanges & Dummy flanges and ES -4, MC-36 & 37 valve bonnet

Pure Graphite Die molded Gland Packing Rings to with stand 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 for Feed water and Steam line 1” HO/MO drain line valves.

Pure Graphite Die molded Gland Packing Rings to with stand 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: 55.6 – 27 – 13.5 mm for Feed water, Steam line 2” HO/MO drain line valves.

Consumables and T& P Charges For Item Sl.No: 1 to 14

SRI VAITHEESWARA CONSTRUCTIONS