rate contract for maintenance of bowl type coal mill of unit 5 and 6 at stps , wbpdcl , rate contract for maintenance of bowl type coal mill of u#5 & 6 under m/m ( b&a ) dept . , santaldih t . p . , wbpdcl , repairing/replacement of bowl hub skirt with necessary works . , dismantling , replacement/readjustment of upper air seal with all necessary work after proper cleaning of leaked coal from labyrinth seal , dismantling , replacement/readjustment of lower air seal with all necessary work including application of belezona , if required after proper cleaning of leaked coal from labyrinth seal , one no . rja replacement with grinding roll replacement , necessary work , roller setting and box up . , servicing of one no . rja with one set new bearing & roller fitting including checking of bearing clearance , cleaning and servicing journal shaft , journal head , trunion , caps & bushing and replacement of upper journal housing liner by spares or by fabrication from m . s . plate . repairing/replacement of welding plug , if required . , servicing of one no . rja without replacement of journal bearing & roller fitting including checking of bearing clearance , cleaning and servicing of journal shaft , journal head , trunion and caps & bushing and replacement of upper journal housing liner by spares or by fabrication from m . s . plate . repairing/replacement of welding plug , if required . , removal , servicing and refitting of rja stop bolt with all necessary work . , replacement of one no . seal air supply flexible hose . , schedule maintenance of mill ( as per scope of work ) , rejection passage cleaning , scrapper checking & minor repairing , pa fan inlet duct checking & cleaning . , replacement of one no . scrapper assembly either by spares or by fabrication from m . s . plate . , cutting & placement of ms plate in pa duct at mill inlet to prevent hot air entry due to passing of had/hag and normalization after work . , scrapper door repairing , patch work of mill bottom side liner ( scrapper zone ) , static part gap repairing /part replacement of airport assembly , replacement of one no classifier deflector blade , adjustment of link for classifier blade opening , servicing and adjustment of all links for proper opening of all classifier blades , checking , dismantling & replacement of one no complete spring assembly with replacement of damaged spares if required with subsequent spring compression load checking/adjustment & roller setting of mill including box up . , mill internal checking for removal of foreign materials including roller setting . , repairing / replacement of rejection chute , box , pipe & expansion joint between rejection port outlet and rejection box . , repairing / replacement of separator grating inside rejection box after proper cleaning . , dismantling & servicing or replacement of knife gate before rejection box with complete fittings after proper cleaning , dismantling & servicing or replacement of rejection box outlet gates with complete fittings . , rejection passage chockage cleaning by poking & hammering from out side and freeness checking of knife gate before rejection box . , patch work on drop pipe and mpo/mdv body after proper cleaning of mill top . , feeder to mill chute replacement after proper cleaning of mill top . , feeder to mill drop pipe replacement ( both upper & lower ) with necessary works , replacement of one no . gasket/seal of victaulic coupling/dresser coupling at mill top . , cleaning of coal and clinker from grinding zone of coal mill , application of m-seal/belzona/grease packing on mpo/mdv/coal pipe . , coal mill ( xrp 883 ) overhauling work , replacement of damaged air port assembly including static assy . with necessary works . , replacement of insulation cover plate at rejection passage with all necessary work , repairing/replacement of mill body liner , air port assembly , upper journal liner plates and other mill internal after removal of 3 nos rja assembly . roller setting and mill box up , replacement/servicing of trunnian bush with roller setting , coal cleaning from mill-top & mill floor , repairing/replacement of mill upper journal liner assembly and skip roller guard plate , repairing of journal head assembly by hard facing , fabrication of mill upper journal liner plate complete set by 8 . 0mm ms plate , reclamation job of coal feeder outlet chute