bids are invited for external and internal cleaning of both boiler 1 - external cleaning of boiler no 1 and 2 20 ton per hr ijt make boilers , external and internal cleaning of both boiler 2 - internal cleaning of both boilers tubes drum to drum tubes screen tubes roof tubes , external and internal cleaning of economiser - external internal cleaning of economiser tubes grill type 100 psi hydraulic at 36 kg cm2 , external and internal cleaning of wet scruber - external internal cleaning of wet scrubber of both boilers , external and internal cleaning of air heater - internal cleaning of air heater tubes by brush thoroughly , external and internal cleaning of head stock - cleaning of all head stock by caustic soda and water , external and internal cleaning of mill house - washing of mill house by pipe and pump pressure , external and internal cleaning of white washing of mill house - cleaning of mill gallery and white washing of mill house gallery total quantity : 10