bids are invited for operation and maintenance power house / power plant - complete overhauling calibration testing and re- commissioning of pressure diff pressure flow level transmitters with termination of cable at both end with proper ferruling and dressing , operation and maintenance power house / power plant - complete overhauling calibration testing and re-commissioning of pressure differential pressure vacuum switches with termination of cable at both end with proper ferruling and dressing , operation and maintenance power house / power plant - complete overhauling calibration testing and re- commissioning of pressure gauges , operation and maintenance power house / power plant - complete overhauling calibration testing and re-commissioning of level switches at site with termination of cable at both end with proper ferruling and dressing , operation and maintenance power house / power plant - overhauling and servicing of b-501 b-601 ss cock valve forged body union and isolating valves , operation and maintenance power house / power plant - complete overhauling cleaning and making them perfectly sealed by gasket and gland replacement of tb ferrule and lugs of junction boxes lir lie , operation and maintenance power house / power plant - cleaning, overhauling and testing of pa flow measurement system, differential pressure measurement system, inlet pressure measurement system in all 06 bowl mill including work in all impulse line.. , operation and maintenance power house / power plant - cleaning overhauling and testing of secondary air flow measurement systemleft right and fabrication of equalizing points if required , operation and maintenance power house / power plant - cleaning and blowing of tapping points of different pressure dp transmitters switches after opening it associated pipeline , operation and maintenance power house / power plant - complete overhauling of drum level hydra step system left 1