Routine and break down maintenance of HP LP valves and safety valves of Unit 8 and 9 DTPS Kasimpur

Amount

Servicing of feed line gate / control valves / NRV size NB- 350 mm, NP-280 Kg./cm² valves covered are E-1, E-2, FD- 13, 14, 15, 16, 17, 18.

Servicing of low load line gate & control valves size NB-200mm NP-280Kg/ cm² valves covered are FD-19, 20, 21

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

Servicing of main Isolating valve SD-1, SD-10 at the inlet of SH spray station, size: NB- 150mm, NP-280Kg / cm².

Servicing of main isolating valve of main steam line (L&R) M.S.-123 & M.S.-124, Nb-300mm, NP-280Kg/ cm².

Servicing bypass valves of main steam valves –MS-125, 126, 127, 128, Nb-50mm, 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 SLSV Type at 56 meter elevation of boiler. MAXIMUM WORKING PARAMETERS: - Pr.-182.5 Kg/cm², Temp. 357ºC (SV1), size-3"/6" Pr.-186.2 Kg./cm², Temp.357ºC (SV 2), size-3"/6" Pr.-188.0 Kg./cm², Temp.357ºC ( SV 3), size-3"/6"

Servicing of electromagnetic relief valve (implies safety valve). MAXIMUM WORKING PARAMETERS:- Pr.-164.6 Kg/cm², Temp.540ºC size-2.5"/4".

Servicing of safety valves installed on hot reheat and cold Reheat line at about 56meter elevation. MAXIMUM WORKING PARAMETERS:- i) CRH SV-8, Pr.-47Kg/ cm², Temp.-345 ºC, size-6"& 8". ii) HRH SV-9 & SV 10, Pr.43.8 Kg/ cm², Temp.-540 ºC, size-6"& 8". iii) HRH SV -11& SV 12, Pr.45.9 Kg/ cm², Temp.-540 ºC, size-6"& 8".

Servicing of safety valve on soot blower line at 56 mtr. elevation. MAXIMUM WORKING PARAMETERS:- SV -15, Pr.-40Kg / cm², Temp.-333 ºC, size-1.5"/2.5"

Servicing of high-pressure valve’s & NRV’s at different elevation boiler from ‘0’meter level to 56 meter level nominal bore may vary from Ø 10mm to Ø100mm.

Servicing / replacement of Pneumatic / manual valves of oil station at AB /CD/ EF Elevation.

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

Servicing of pneumatic operated NB 150mm / 300 mm valves on Aux. PRDS line.

Servicing of electrically drive steam valve NB 100mm to 300mm on Aux. PRDS line.

Servicing of electrically drive Nb- 50mm valves on Aux. PRDS line

Servicing of pneumatic operated control valve size NB 50 to 100 mm at different floors of boiler from ‘0’meter level to 56 meter level.

Servicing of hand operated valve/NRV of size NB 150 to 250mm at different floors of boiler from‘0’meter level to 56meter level.

Servicing of hand operated valves /NRV’s of size Nb 300 to 350mm at different floors of boiler from‘0’meter level to 56 meter level. The

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

Changing flange gaskets of valve’s & flange at different floors from ‘0’meter level to 56 meter level of boiler and at PRDS floor. 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.

Attending leakages of pipeline & headers etc. of main boiler, and aux. PRDS of 250 MW by cutting grinding and H.P. welding of damaged portion putting new spools/bends if required.

Servicing of safety valve of Aux. PRDS size NB 150-200mm.

Replacement of Pipe dia. 10 mm to 40mm.

Attending minor leakage from pipe, bend etc at different place of boiler side ‘0’ meter to ‘54’ meter.

Replacement of gasket of Manhole of Boiler drum

Routine maintenance of HP/LP valves, Safety valves, PRDS valves in general shift.

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