overhauling maintenance of ducts and dampers of boiler of unit no. 06 of 2x500 mw, dtps, anpara- 1 servicing of medium / large size gates in id, fd, pa, hot / cold air ducts, flue gas ducts & rectification of defects, if any. 2 servicing & repairing of discharge / suction dampers of id, fd, pa air and flue gas dampers. 3 cutting, welding & patch work in flue gas duct, secondary air duct / primary air duct including dampers flap, baffle plates and hopper etc.welding 4 cutting, welding & patch work in flue gas duct, secondary air duct / primary air duct including dampers flap, baffle plates and hopper etc.cutting 5 cutting, welding & patch work in flue gas duct, secondary air duct / primary air duct including dampers flap, baffle plates and hopper etc.patch work 6 replacement / repair of damaged and eroded bracing pipe with new bracing pipe of hot air duct / cold air duct / flue gas duct 7 repairing of expansion joints 8 flue gas ducts cleaning / inspection: ( for ducts of one unit to be considered as one job ) pa fan discharge to aph inlet 9 flue gas ducts cleaning / inspection: ( for ducts of one unit to be considered as one job ) pa cold air discharge duct: from pa fan discharge to cold pa dampers of all mills ( a-k ) 10 flue gas ducts cleaning / inspection: ( for ducts of one unit to be considered as one job ) pa hot air discharge duct : from aph outlet to hot pa dampers of all mills ( a-k ) 11 flue gas ducts cleaning / inspection: ( for ducts of one unit to be considered as one job ) pa ducts: from hot / cold air dampers of mills to mill assembly of all mills ( a-k ) 12 flue gas ducts cleaning / inspection: ( for ducts of one unit to be considered as one job ) fd fan discharge to aph inlet 13 flue gas ducts cleaning / inspection: ( for ducts of one unit to be considered as one job ) flue gas duct: from esp outlet gate to id fan suction damper 14 flue gas ducts cleaning / inspection: ( for ducts of one unit to be considered as one job ) flue gas duct: from id fan discharge damper to chimney 15 fabrication / repairing of duct emtying chute meant for disposal of ash. 16 complete insulation of ducts ( primary air, secondary air, flue gas ) covering entire area from pa fans ducting, fd fans ducting upto aph inlet, esp outlet gates to id fans upto chimney:-when new cladding is to be provided with 20-24gauge g.i. / aluminium sheet. work includes fabrication and fixing of cladding structure, when more than one layer of mineral wool blankets / pads , are provided / fixed at site 17 complete insulation of ducts ( primary air, secondary air, flue gas ) covering entire area from pa fans ducting, fd fans ducting upto aph inlet, esp outlet gates to id fans upto chimney:-when old / removed cladding sheets to be fixed with the help of self tapping screws and more than one layer of mineral wool blankets / pads , are provided or the old / removed but usable are provided / fixed at site 18 replacement / refixing of old / new gi / ai sheets with the help of self tapping screws 19 fabrication / erection of temporary platforms for working at different heights on ducts ( the job includes disassembling of platform after completion of work ) as mentioned below:erection of platform of height upto 10 mtr. 20 fabrication / erection of temporary platforms for working at different heights on ducts ( the job includes disassembling of platform after completion of work ) as mentioned below:erection of platform of height upto 15 mtr. 21 fixing the scaffolding pipes from 0 mtrs. to elevated duct area ( above 20 meters ) & dismantling the same after completion of work and thereafter shifting the pipes to site store for complete insulation of ducts ( primary air, secondary air, flue gas ) covering entire area from esp outlet gate to id fans inlet & id fans outlet upto chimney ( only vertical & elevated duct areas )