Preventive/Breakdown maintenance of H.P. Valves

Amount

Servicing of feed line gate control valves NRV size NB- 300mm NP-250 Kg./ cm² valves covered are E-1, E-2, BF-29, 30,33,34,37&BF-38.

Servicing of low load line gate & control valves size NB-200mm NP-250Kg/ cm² valves covered are BF-31, 32,35,36,39 & BF-40

Servicing of Pneumatically operated S/H, R/H attemperation control valves & RH Spray block valves.

Servicing of main Isolating valve BF-61 at the inlet of SH spray station, size: Nb- 150mm, NP-250Kg / cm²

Servicing of main isolating valve of main steam line (L&R) M.S.-29 & M.S.-30,Nb-250mm, NP-250Kg/ cm²

Servicing bypass valves of main steam valves, MS-29A, and MS-30A, Nb-25mm, NP-250Kg/ cm²

Servicing of bypass valves of feed station, low load line valve and main isolation valve of inlet to SH-Nb-25mm, NP-250Kg/cm².

Servicing of boiler drum safety valves and safety valve on main steam line on right hand side of boiler at 52meter elevation

Servicing of electromagnetic relief valve (implies safety valve).

Servicing of safety valves installed on hot reheat and cold reheat line at about 50meter elevation.

Servicing of safety valve on soot blower line at 52mtr elevation

Servicing of high-pressure valve & NRV’s at different elevation from ‘0’meter level to 54 meter level, in dozing hall nominal bore may vary from Ø10mm to Ø100mm.

Replacement of H.P.Valves/NRV of sizes-Nb-10 / 15 / 25mm (H/ O, M/O) at different floors from ‘0’meter level to 54meter level, Dozing hall and at Dearator floor by cutting of damaged valve and welding of new valve after its revisioning.

Servicing/replacement of hydra motor valves of oil station at AB / CD / EF elevation

Servicing of oil line valves and NRV’s of oil station at AB / CD / EF elevation of boiler

Servicing/overhauling of pneumatic operated dia150mm/dia 250mm valves on Aux. PRDS line and Dearator.

Servicing /overhauling of electrically drive steam valve dia 100mm to 250mm on Aux. PRDS line

Servicing/overhauling of electrically driven Nb- 400mm gate valve at Dearator

Servicing/overhauling of electrically drove Nb- 50mm valves on Aux. PRDS line.

Servicing/overhauling of pneumatic operated control valve size 50 to 100mm

Servicing/overhauling of hand operated valve/NRV’s of size 150 to 250mm

Servicing /overhauling of hand operated valves /NRV’s of size 300/350 mm.

Servicing and revisioning of steam valves & NRV’s of Aux. PRDS line and Dearator. Rate to be quoted per mm basis.

Changing flange gaskets of valves & flange at different elevation of boiler. Rate should be quoted on per MM basis

Replacement of gland packing with new one from valves leaking from glands. Rate should be quoted on per MM basis.

Replacement of various safety valves of critical piping such as Boiler Drum, Super Heater, CRH, HRH , etc

Replacement of 150 mm Motorized Valve (PRDS(BIG), BF-61 and similar Valves)

Replacement of 100 mm Motorized Valve (PRDS (small) and similar Valve )

Attending leakages of pipeline & headers etc. of main boiler, Dearator and aux. PRDS of 3x210 MW by cutting grinding and H.P. welding of damaged portion putting new spools/bends if required.

Servicing/overhauling of pneumatically operated actuators of valve. Size dia 40 to 100 mm.

Servicing/overhauling of pneumatically operated actuators of valves size dia 202 to 300 mm

Fabrication of H.P. drip/drain line bends out of available pipe by cutting, grinding & H.P. welding.

Servicing / Replacement/overhauling of safety valve of Aux. PRDS.

Servicing/Replacement/overhauling of safety valves of Dearator/CBD Tank/Pegging Line.

Blanking of hot reheat and cold reheat NRV by blanking device & normalizing the same

Replacement of H.P. valves /NRV of the following sixes at Dearator floor by cutting of damaged valves/NRV by welding with New/repaired valve/NRV after its revision.

a) 100 MM valve / NRV

b) 150 MM valve / NRV

c) 200 MM valve /NRV

d) 250 MM valve/NRV

Replacement of H.P. valve (H/O, M/O, Pneumatic)/NRV of the following sizes at Dearator floor of flange end Type by opening Nut and Bolts of flange and installation of new /repaired valves/NRV on it properly after replacement of gasket and servicing of valve. size 200 / 250mm valve / NRV

Replacement of start up vents (R /H & S / H) at 54-mtr elevation

Replacement of high Pressure valves (motor operated / hand operated/Pneumatic) of critical piping of Boiler of size:Nb-40mm to 65mm

Replacement of Electrical / Pneumatic actuators of valve size up to Nb-300mm at different elevations;

Replacement of H.P. drain/drip pipes of size Nb-200mm, Thickness- 6mm, Material- Carbon Steel.

Replacement up to three joints shall be considered as one job.

Rate per joints beyond above

Replacement of H.P. drain/drip pipes of size Nb-150mm, Thickness- 8mm, Material- Carbon Steel.

Replacement up to three joints shall be considered as one job

Rate per joints beyond above

M/S BIHAR CONSTRUCTION CO.