preventive routine maintenance and general upkeep of c . w . system of 2x500 mw , btps , anpara , part- ( a ) , preventive routine maintenance and general upkeep of c . w . pumps , lub . water pump , piping , valves , nrvs , tanks , etc . of unit 4 & 5 . , operation up-keeping routine maintenance of of eot crane of c . w . pump house in general shift . from ( 8 . 30 hrs . to 17 . 30 hrs ) including one hour lunch time . , operation of eot cranes besides above hrs . in emergency , during holiday and sunday on overtime basis as per site requirement . , part- ( b ) , rectification / replacement of butter-fly valve sheet ( rubber gasket ) without repair / replacement of retaining ring as per scope of work . , rectification / replacement of butter-fly valve sheet ( rubber gasket ) with repair / replacement of retaining ring as per scope of work . , servicing of gearbox of butterfly valves of c . w . pumps . , decoupling , alignment , coupling of pump with its motor in addition to o / h of pump as and when required ( on request of electrical maintenance division )