procurement of 450nb ms erw pipe and 250 nb ms erw pipe of 9.52 mm thick for overhauling of unit 4 and unit 2 ahp-mm, stg-i and ii, sgtpp. , procurement of 450nb & 250 nb ms erw pipe ( 9.52 mm thk ) for overhauling of u#4, & u#2 ahp-mm, stg-i & ii, sgtpp. , pipe ms erw black pipe450 nbx9.52 thk. for ash slrry system ofsgtpp. is:3589 , grade fe 410 ; pipe length 06 to 12.0 mtrs ; make: sail / tata. ( both ends of the pipe will be bevel ends, tolerance + / -5% on total length, make: sail / tata / jindal / rinl ) , pipe erw 250 nb 9.52 thk # 250 nb 9.52 thickness x ( standard ) o.d.273 mm o.d of erw pipe as per is-3589 grade fe 410 of m.s pipe length=6 mtrs.each. ( make:sail / tata / jindal / rinl )