annual major mechanical maintenance and overhauling of wtp equipments . , maint . & o/h of clarifier lift pumps . , as per scope of work . , o/h of cooling tower make up pumps . , as per scope of work . , o/h of service water pumps . , as per scope of work . , o/h of filter supply pumps . , as per scope of work . , o/h of smelter supply pumps . , as per scope of work . , o/h of d . m . plant supply pumps . , as per scope of work . , o/h of drinking water pumps . , as per scope of work . , o/h of sludge disposal pumps . , as per scope of work . , o/h of ind . recycle pumps . , as per scope of work . , o/h of sludge disposal pumps . ( npit&idwri , as per scope of work . , o/h of horizontal centrifugal pumps , as per scope of work . , o/h of horzontal pumps ( stp ) , as per scope of work . , o/h of metering pumps ( ch . h/reg . room ) , as per scope of work . , o/h of metering pumps ( nptp/idwrs ) , as per scope of work . , o/h of flash mixer stirrers , as per scope of work . , o/h of alum/sod . carbonate/brine , as per scope of work . , o/h of gravity filter blower , as per scope of work . , o/h of degasser air blower , as per scope of work . , o/h of mixed bed blower , as per scope of work . , o/h of tc-50 compressor , as per scope of work . , clarifloculator wheel repair , as per scope of work . , repair/repl of paddle gb/driving gb , as per scope of work . , replacement of pully/v-belts , as per scope of work . , repair/repl of paddle shaft/plumber bloc , as per scope of work . , alignment of bridge , as per scope of work . , rail alignment , as per scope of work . , rail replacment , as per scope of work . , driving/carriage wheel replacement , as per scope of work . , guide wheel repair/replacement , as per scope of work . , repair/replacement of main drive gear , as per scope of work . , fabrication of rail foundation box , as per scope of work . , positioning & alignment of rail foundati , as per scope of work . , top resin strainer repair/replacement , as per scope of work . , side resin strainer repair/replacement . , as per scope of work . , man hole cover opening/box up . , as per scope of work . , resin trap repair/replacement , as per scope of work . , orifice plate removal &refixing . , as per scope of work . , rep . & o/h of 900mm butterfly valve , as per scope of work . , rep . & o/h of 700mm butterfly valve , as per scope of work . , rep . & o/h of 600mm butterfly valve , as per scope of work . , rep . & o/h of 500mm butterfly valve , as per scope of work . , rep . & o/h of 350mm butterfly valve , as per scope of work . , rep . & o/h of 300/250mm butterfly valve , as per scope of work . , rep . & o/h of 200/150mm butterfly valve , as per scope of work . , o/h of 750/600mm gate valve , as per scope of work . , o/h of 350/300/250mm gate valve , as per scope of work . , o/h of 200/150mm gate valve , as per scope of work . , replacement of gate valve of all sizes . , as per scope of work . , o/h of sluice gates 750mm & 1050mm , as per scope of work . , o/h of sluice gates 1200mm & 1500mm , as per scope of work . , o/h of sluice gates 1400mm ( zero dish . ga , as per scope of work . , repl . of 25/40/50/80mm diaphragm/saunder , as per scope of work . , repl . of 100/150mm diaphragm/saunders va , as per scope of work . , repl . of 200/250mm diaphragm/saunders va , as per scope of work . , o/h of 25/40/50/80mm diaphragm/saunders , as per scope of work . , o/h of 100/150mm diaphragm/saunders valv , as per scope of work . , o/h of 200/250mm diaphragm/saunders valv , as per scope of work . , repair/repl . of arv ( size 25/50/80mm ) , as per scope of work . , repair/repl . of arv ( size 100/15/200 ) , as per scope of work . , repair/repl . of foot valves at n-pit , as per scope of work . , repair/replacement of foot valves at stp , as per scope of work . , dismantling of msrl/ms pipes 200nb , as per scope of work . , erection of msrl/ms pipes 200nb , as per scope of work . , dismantling of ss pipes 200nb , as per scope of work . , erection of ss pipes 200nb , as per scope of work . , erection of moving equipments . , as per scope of work . , erection of static equipments . , as per scope of work . , dismantling of moving equipments . , as per scope of work . , dismantling of static equipments . , as per scope of work . , mild steel welding , as per scope of work . , ss welding , as per scope of work . , ms / ss cutting , as per scope of work . , erection of scafolding , as per scope of work . , o/h of crane at iph , as per scope of work . , o/h of crane at c . l . p . h . , as per scope of work . , o/h of crane at cwph , as per scope of work . , o/h of crane at fph , as per scope of work . , o/h of crane at pre/post chlo . room/idwrs , as per scope of work . , o/h of alum lifting hoist , as per scope of work . , o/h of hoist at sludge ph/d . m . plant/ f/f , as per scope of work . , o/h of chain pully block ( 5t-15t ) , as per scope of work . , o/h of chain pully block above 15t , as per scope of work . , o/h of chain pully block up to 5t , as per scope of work . , attending gland lkg . of vert . & hor . p/p , as per scope of work . , chlorine cylinder conn . / disconnection , as per scope of work . , repl . of chlo . cylinder flexible connector , as per scope of work . , asst . in pm of all vertical pumps , as per scope of work . , asst . in pm of all horizontal pumps , as per scope of work . , asst . in pm of all metering pumps , as per scope of work . , asst . in pm of allcompressors & blowers , asst . in pm of all stirrers , as per scope of work . , asst . in pm of clarifloculator . , as per scope of work . , asst . in oil seal repl . of gb of stirrer , as per scope of work . , asst . in repl . of view glasses , as per scope of work . , asst . in repair/repl . of level indicator , as per scope of work . , asst . for thickness measurement . , as per scope of work . , asst . for pipeline lkg . outside plant , as per scope of work . , asst . for mat . handling from stores , as per scope of work . , pipeline support , as per scope of work . , o/h of rain water harvesting p/p , as per scope of work . , maint/o/h of exit pit pump , as per scope of work . , ere/fab of 100 mm ms pipe , as per scope of work . , ere/fab of 150 mm ms pipe , as per scope of work . , ere/fab 200 mm ms pipe , as per scope of work . , ere/fab 250 mm ms pipe , as per scope of work . , ere/fab 300 mm ms pipe , as per scope of work . , ere/fab 500 mm ms pipe , as per scope of work . , ere/fab 600 mm ms pipe , as per scope of work . , supply of hydra , as per scope of work .