bids are invited for repair, maintenance, and installation of plant/ systems/equipments (version 2) - thermal power plant; repairing of duct (eco to aph inlet secondary air) during oh-4; service provider - repairing of secondary air duct of furnace wind box (left/right). , servicing/revisioning of secondary air d ers of wind box. , servicing / revisioning of hand/ motor operated flue gas/ primary air/ secondary air d ers. a. disconnecting the d er link by taking out the link pin.b. removal of gland bushes & packings, filling of new gland packings to arrest leakage if any.c. repairing of gland bushes if found eroded.d. making the d er free for smooth operation. , repairing/ replacement of eroded flaps of various flue gas/ p.a/ s.a. d ers by providing m.s plates, which shall be provided by the department free of cost. , repairing of stainless steel shafts of by-plane d ers by welding/ filling of weldments on eroded portion by s.s. welding electrodes and providing stainless steel sleeve over there. , repairing of flue gas/ primary air/ secondary air duct by providing m.s plate over eroded portion and their welding. , welding of various ducts to arrest leakage of air/ gas. , repairing/ replacement of damaged bracing pipes of various flue gas ducts. , repairing/ replacement of eroded beam of duct of section 150 mm and above. , chequering of plate in the straight/ slant zone of duct above flue gas inlet d ers below economiser or any other section of boiler & its spares by sequence welding of 10 cm sq. chequer.