handling of materials at bhel / clients stores / storage yard and transportation to site erection, testing, assistance for commissioning & trial operation including supply & application of final painting and handing over of flue gas desulphurization system ( fgd ) erection and commissioning of ducting works from unit 4, 5 & 6 including tapping for bypass dampers up to booster fan inlet gate, erection of common systems incl. acwsystem for fgd auxiliaries, dmcwsystem for fgd auxiliaries, instrument air piping, service air piping, acw pumps, esw pumps, self cleaning strainers, conical strainer, phe, control valves, flow orifices, rotameters, electric hoists, single girder crane, wet ball mill & aux, chemical dosing system, fire protection system, naoh system, gypsum de-watering system, bag filter at top of ls day silo, air canon / air blaster, 2 nos dg sets at 3x200mw + 3x500 mw ntpc ramagundam, stage- i & ii, telangana