procurement of gi pipes and fittings required for renovation of compressed air pipelines and interconnection of stage i and ii chp mm department sgtpp wbpdcl , procurement of gi pipes & fittings required for renovation of compressed air pipelines & interconnection of stage i & ii, chp-mm department , sgtpp / wbpdcl , pipe, gi, 40nb, min length 6 mtr ( pipe, gi, 40nb, min length 6 mtr; thickness-4.0 mm, is-1239 ( part-i ) , heavy duty, make: :sail / tata / jindal ) , pipe gi 32 nb of spray water line system thickness-4.0mm, is 1239 ( part-i ) , heavy duty ( pipe gi 32 nb for compressed air system; thickness-4.0 mm, is-1239 ( part-i ) , heavy duty, make: :sail / tata / jindal ) , pipe, gi, 20nb, 3 / 4inch ( thickness-3.2 mm, is-1239 ( part-i ) , heavy duty< ( >, < ) > make:sail / tata / jindal ) , socket 40mm dia g i # ( heavy duty, threaded ) , g.i.socket size 32 mm ( heavy duty, threaded ) , socket gi 20nb total length: 40mm g.i.socket size: 20nb total length: 40mm both side thread ( heavy duty ) , socket gi 15nb total length: 40mm g.i.socket size: 15nb total length: 40mm both side thread ( heavy duty ) , elbow, threaded, galvanized, 40 nb # ( heavy duty ) , g.i. union size 40 mm dia ( heavy duty ) , tee, gi tee, 32x32x32mm nb # ( tee unequal size: 32x32x20 mm, heavy duty, threaded ends ) , elbow, gi 90 $for air line sgtpp ( elbow, 20 nb, g.i. 90 deg, heavy duty, screw end ( bsp thread ) ) , ball valve, ss, 40 mm ( 3 piece ) bdk engg industries class: 600, bore: full, material: cf8, seat: reinforced ptfe, end screwed ( material: ss, threaded ends ) , nrv for compressed air line size: 40nb # ( swing type , body : ci, flange end )