bids are invited for custom bid for services - refractory mesonery in boiler - after dismantling the arches, walls, and roof vassels of boiler no. 1, a 20-tonne capacity furnace, as per instructions, repair them accordingly and give a satisfactory trial by shutting off all flue gas from the boiler , after dismantling the arches, walls, and roof vassels of boiler no. 2, a 20-tonne capacity furnace, repair them accordingly and give a satisfactory trial by shutting off all flue gas from the boiler , after dismantling the arches, walls, and roof vassels of boiler no. 3, a 30-tonne capacity furnace, repair them accordingly and give a satisfactory trial , dismantling the outer and inner wall tiles of boiler no. 3 as per instructions, as well as dismantling and reinstalling all flue gas diversion valves and other fittings, and conducting a satisfactory trial , dismantling the roof and walls of boiler no. 3 as per instructions for replacing the super heater coil, and reinstalling and conducting a satisfactory trial