dismantling fabrication erection of boiler tubes work.-2 dismantling, fabrication and erection of roof tube, size 70mm od x 4 .06 mm thickness for 30 ton / hr capacity boiler no. 3 with hydrolic testing at 36 kg / cm2 and with satisfactory trial. ( new tube will be supply by mill ) . 3 dismantling, fabrication and erection of screen tubesize 70mm od x 4 .06 mm thickness for 20 ton / hr capacity wil make boiler no. 1 with hydrolic testing at 36 kg / cm2 and with satisfactory trial ( new tube will be supply by mill ) . 4 dismantling, fabrication and erection of screen tube tube, size 70mm od x 4.06 mm thickness for 30 ton / hr capacity boiler no. 3 with hydrolic testing at 36 kg / cm2 and with satisfactory trial ( new tube will be supply by mill ) . 5 replacement of both side wall ( bottom ) header of 20 ton boiler no.2 with hydrolic testing at 36 kg / cm2 and with materials size of header 8 material type- nbxsch.100 lenth-7 metre each header ( all materials in your scope ) 6 fabrication of fin type economizer tube of 20 ton boiler withhydrolic testing. tube size- 101.6mm od x 4.06mm thickx5 mtr long ( new tube will be supply by mill ) . ( fabrication of fins with material in your scope. )