supply and delivery of isi marked 40 mm. dia galvanised miled steel tube medium conforming to is 1239 part1 2004 sixth revision with latest amendment under rajarhat store for different ws scheme under of wbphed. , supply & delivery of isi marked 40 mm. dia nb galvanised miled steel tube ( medium ) conforming to is: 1239 ( part-i ) / 2004 ( sixth revision ) with latest amendment. , supply and delivery of following dia isi marked galvanised mild steel tube ( medium class ) electric resistance welded ( erw ) / high frequency induction welded ( hfiw ) conforming to is: 1239 ( part-i ) / 2004 ( sixty revision ) with amendment no. 1 to 4 screwed at both ends as per is: 554 / 1999, socketed at one end and other end protected with plastic thread protector, the socket conforming to is; 1239 ( part-ii ) / 1992 ( forth revision ) with amendment no. 1 to 3 in random length of 4 to 7 mtrs. in the following nominal bore size. 40mm. dia g.i. pipe ( medium class ) [ jindal / utkarsh / nezone / bst infratech ltd / bansal ( skipper ) or any other non tata phe approved brand ]