Tender For supply of isi marked galvanizedsteeltubes screwed with one end (isi marked) socketed, other e nd protected with plastic thread protect. class : b, bore size (nominal) in mm : 50, outside diameter b etween 59.7mm - 60.8mm, wall thickness 3.60mm, confirming to is : 1239 (part i) 2004, and both end ed threaded confirming to is : 554 : 1954 make : tt swastik, prakash surya, tata or jindal or similar n ote : each pipe to be required in 6 meters of length . a certificate that material has been purchase from the oem/authorized dealer of oem along with the materials by the firm with 30 months warramty/ guar antee. [ warranty period: 30 months after the date of delivery ]