annual contract for operation mechanical and electrical maintenance of ahp stage i 2x300 mw sgtpp for 01 year , annual contract for operation and mechanical maintenance , electrical maintenance of ash handling plant ( dcips make ) , stage i ( 2x300 mw ) sgtpp . , mandatory job : mechanical maintenance work of ahp for 12 months , mandatory job : electrical maintenance work of ahp for 12 months , mandatory job : operation of ahp for 12 months , optional job : cleaning of economizer hopper ash by manual method ( including bagging & bag will be provived by the party ) or by water per hopper basis during shut down condition and disposal of ash at suitable location , optional job : cleaning of air-preheater hoper ash by manual method ( including bagging & bag will be provived by the party ) or by water per hopper basis during shut down condition and disposal of ash at suitable location , optional job : cleaning of clinkers , damaged refractory or resuadual ash from inside the bottom ash hopper during shut down condition and disposal of same at suitable location . , optional job : over hauling of ba clinker grinder including dismantling & reffiting of clinker grinder , chute , optional job : replacement of power cylinder for ba hopper feed gate , optional job : alignment of ba hopper feed gate during during shutdown condition . strengthening of different supports feed gate and if required replacement of guide rail , roller , wedge etc . , optional job : overhauling of vacuum pumps including dismantling & refitting of vacuum pump . , optional job : replacement of flushing apparatus including dismantling & refitting of flushing apparatus . , optional job : ht cable jointing work . , optional job : cable laying 185 sq . mm . 3core cu cable .