bids are invited for repair and overhauling service - dismantling febrication and erection of sidewall tube size 76 point 20 mm od; dismantling febrication and erection of sidewall tube size 76 point 20 mm od; no; service provider premises , repair and overhauling service - dismantling febrication and erection of roof tube size 70 mm od; dismantling febrication and erection of roof tube size 70 mm od; no; service provider premises , repair and overhauling service - dismantling febrication and erection of water relief tube size 76 point 20 mm od; dismantling febrication and erection of water relief tube size 76 point 20 mm od; no; service provider premises , repair and overhauling service - dismantling febrication and erection of super heater coils size 44 point 45 mm od; dismantling febrication and erection of super heater coils size 44 point 45 mm od; no; service provider premises , repair and overhauling service - replacement of nipple of bolier no 06 tubular type economizer coil size 38 point 10 mm; replacement of nipple of bolier no 06 tubular type economizer coil size 38 point 10 mm; no; service provider premises - dismantling febrication and erection of sidewall tube size 76.20 mm od , dismantling febrication and erection of roof tube size 70 mm od , dismantling febrication and erection of water relief tube size 76.20 mm od , dismantling febrication and erection of super heater coils size 44.45 mm od , replacement of nipple of bolier no. 06 tubular type economizer coil size 38.10 mm