bids are invited for maintenance of hsd fired hot water generators - maintenance (including the cost of consumables, cleaning material (oil, grease, duster, cotton waste etc) of complete heating system including existing 3 no. of 400000 kcal and 02 nos. 200000 kcal hsd fired hot water generators and accessories i.e. heating pipe line including fcus installed at airport, as recommended and instructed by engineer-in- charge for maintaining the system in acceptable, operational and serviceable working condition for following complete all as required. (a mandatory weekly visit in airport by deployment of a technician for preventive maintenance and attending any number of breakdowns) , overhauling of existing 3 no. of 400000 kcal hsd fired hot water generator - one time overhauling service of existing 3 no. of 400000 kcal hsd fired hot water generators including the work of tube and burner cleaning, fuel pump, diesel pipe, filter, generator, motors, nozzle and photocell repair/replacement complete as required as per the site conditions, item cost shall include cost of repairing/replacement, if required. , over hauling of existing 2 no. of 200000 kcal hsd fired hot water generator - one time complete repairing and over hauling service of existing 2 no. of 200000 kcal hsd fired hot water generators including the work of tube and burner cleaning, fuel pump , diesel pipe, filter, generator, motors, nozzle and photocell repair/replacement complete as required as per the site conditions, item cost shall include cost of repairing/replacement of parts, if required. , overhauling of fcus and hot water pipe line - one time complete repairing and overhauling of fcus & hot water pipe line including the work of descaling if required, condensor repairing, arresting leakages in pipe line including welding/modification/rectification/ replacement with all necessary spares and part etc complete as required as per site conditions. , class o nitrile rubber elastomeric insulation - providing