overhauling / servicing of h.p. valves and actuators including replacement of h.p. drip / drain line pipes of unit-ii of 3x210 m.w., atps, anpara- 1 servicing of feed line gate / control valves / nrv size nb- 300mm np-250 kg. / cm² 2 servicing of low load line gate & control valves size nb- 200mm np-250kg / cm² 3 servicing of pneumatically operated s / h, r / h attemperation control valves & rh spray block valves. 4 servicing of main isolating valve bf-61 at the inlet of sh spray station, size: nb- 150mm, np-250kg / cm² 5 servicing of main isolating valve of main steam line ( l&r ) m.s.-29 & m.s.-30, nb-350mm, np-250kg / cm² 6 servicing bypass valves of main steam valves –ms-29a, and ms-30a, nb-25mm, np-250kg / cm² 7 servicing of bypass valves of feed station, low load line valve and main isolation valve of inlet to sh-nb-25mm, np-250kg / cm². 8 servicing of boiler drum safety valves and safety valve on main steam line on right hand side of boiler at 52meter elevation. 9 servicing of electromagnetic relief valve ( implies safety valve ) .maximum working parameters:-pr.-160.0kg / cm², temp.540ºc size-2½” / 2” / 4”. 10 servicing of safety valves installed on hot reheat and cold reheat line at about 50meter elevation.maximum working parameters:-i ) crh sv ( r-5 ) pr.-45kg / cm², temp. -345 ºc, size- 6”&8”.ii ) crh –sv ( r-6 ) pr.46kg / cm², temp. . -345 ºc, size 6”&8”.iii ) crh –sv ( r-11 ) pr.45kg / cm², temp.-345 ºc, size 6”&8”.iv ) hrh –sv ( r-20 ) pr.42.5kg / cm², temp.-540 ºc, size 6”&8”. 11 servicing of safety valve on soot blower line at 52mtr elevation.maximum working parameters:-sr –sv ( se-7 ) pr.42kg / cm², temp.-360 ºc, size-2½” / 2½” 12 servicing of high-pressure valve & nrv’s at different elevation from ‘0’meter level to 54meter level nominal bore may vary from ø10mm to ø100mm. 13 replacement of h.p. valves of sizes-nb-10 / 15 / 25mm ( h / o ) at different floors from ‘0’meter level to 54meter level and at dearator floor by cutting of damaged valve and welding of new valve after its revisioning. 14 servicing / replacement of hydra motor valves of oil station at ab / cd / ef elevation. 15 servicing of oil line valves and nrv’s of oil station at ab / cd / ef elevation of boiler. 16 servicing / overhauling of pneumatic operated dia150mm / dia 250mm valves on aux. prds line and deaerator. 17 servicing / overhauling of electrically drive steam valve dia 100mm to 250mm on aux. prds line. 18 servicing / overhauling of electrically driven nb- 400mm gate valve at dearator. 19 servicing / overhauling of electrically drove nb- 50mm valves on aux. prds line. 20 servicing / overhauling of pneumatic operated control valve size 50 to 100mm 21 servicing / overhauling of hand operated valve / nrv’s of size 150 to 250mm. 22 servicing / overhauling of hand operated valves / nrv’s of size 300mm and above. 23 servicing and revisioning of steam valves & nrv’s of aux. prds line and dearator. 24 changing flange gaskets of valves & flange at different elevation of boiler. 25 replacement of gland packing with new one from valves leaking from glands. 26 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.note: -rates should be quoted on the basis of per cm / per cm thickness of welded seen, which should be inclusive of cutting, grinding, putting new spools / bends if required and h.p. welding. 27 servicing / overhauling of pneumatically operated actuators of valve. size dia 40 to 100mm. 28 servicing / overhauling of pneumatically operated actuators of valves size dia 200 to 300mm 29 fabrication of h.p. drip line bends out available pipe by cutting, grinding & h.p. welding. 30 servicing / overhauling of safety valve of aux. prds 31 servicing / overhauling of safety valves of dearator. 32 blanking of hot reheat and cold reheat nrv by blanking device & normalizing the same. 33 replacement of h.p. valves / nrv of 100 mm valve / nrv at dearator floor by cutting and welding with new / repaired valve / nrv after its revision 34 replacement of h.p. valves / nrv of 150 mm valve / nrv at dearator floor by cutting and welding with new / repaired valve / nrv after its revision 35 replacement of h.p. valves / nrv of 200 mm valve / nrv at dearator floor by cutting and welding with new / repaired valve / nrv after its revision 36 replacement of h.p. valves / nrv of 250 mm valve / nrv at dearator floor by cutting and welding with new / repaired valve / nrv after its revision 37 replacement of h.p.valve / nrv of 200 to 350 mm 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 38 replacement of start up vents ( r / h & s / h ) , at 54-mtr elevation. 39 replacement of high pressure valves ( motor operated / pneumatic operated / hand operated ) of critical piping of boiler of size: nb-40mm to 65mm 40 replacement of pneumatic actuators of valve size up to nb-300mm at different elevations. 41 replacement of h.p. drain pipes of size nb-200mm, thickness- 6mm, material- carbon steel per joint 42 replacement of h.p. drain pipes of size nb-150mm, thickness- 8mm, material- carbon steel per joint 43 optional work 44 replacement of various safety valves of critical piping such as boiler drum, super heater, crh, hrhetc . 45 replacement of 150mm prds control valve 46 replacement of 100mm prds control valve