bids are invited for repair, maintenance, and installation of plant/ systems/equipments (version 2) - thermal power plant; overhauling of flue gas air duct including gate/d er replacement of bracing pipe fabrication/repairing of diversion post and other associated wo.. - overhauling of flue gas duct and air duct , repair of flue gas duct/air duct by patching / grafting , replacement of beams / channels inside ducts , gas cutting of ms / sail hard/ steel plate (3.15 to 20mm) , welding of ms / sail hard/ steel plate ( 3.15 to 20mm) , overhauling of gate /d er of duct and replacement of bracing pipe & fabrication/ repairing of diversion post and other repairing/patching work of associated gate/d er , overhauling of primary outlet gas distribution d ers of after aph of flue gas path, 500mw 4th unit , replacement of primary outlet gas distribution d er flap with new one , overhauling of secondary outlet gas distribution d ers of after aph of flue gas path, 500mw 4th unit , replacement of secondary outlet gas distribution d er flap with new one , servicing of discharge/suction d er of fd/pa and primary, hot / cold air d er , replacement of flap of discharge/suction d er of fd/pa and primary, hot/cold air d er with new one , overhauling / servicing of guillotine gate 500mw , repairing of side wall, roof & floor of primary/ secondary gas distribution area from aph to common duct of primary/secondary (from 3.15 mm to 20 mm plate) , steel fabrication & erection of diversion post / plate form etc. , dismantling of steel structure of duct , replacement of bracing pipe / protective angle (up to 6 meter)