dismantling, fabrication and erection of boilers tubes as per our drawings/simple , dismantling fabrication and eration of boiler tubes. , dismantling, fabrication & eretion of riser tube, size 76.2mm od x 6779 mm. with hydraulic testing at desired pressure of boiler no- 01 , dismantling, fabrication & erection of drum to drum tube, size 63.5mm od x 7845mm with hydraulic testing at desired pressure of boiler no--2 , fabrication of 101.6mm od x 4.06mm thick grilles type economizes tube (note-; party will be supplies m.s fins and machining of our old flanges with fitting.) , dismantling, fabrication and erection of riser tube, size 76.2mmod x 6779 mm with hydraulic testing at desired pressure of boiler no--3.