Tubes are manufactured from mild steel strips slitted from H.R. coils confirming to IS: 10748-1984 and other national & international specifications. The strip passes through a series of driven forming and finrolls and is given the desired circular shape and is welded continuously by the passage of an electric current having a frequency of about 4,50,000 cycles/second at 11000 to 14000 Volts After the excess weld bead has been removed, the pipe passes through a set of sizing rolls where it is rolled to the correct outside diameter. The pipes are than cut into required lengths by automatic cutting machines. Then these go to automatic Galvanizing line. The uniform coating as per BIS 4736-1986 (over 400g/M2) on average is maintained. From here, the tubes travel to finishing line, where those are threaded, socketed & fitted with PVC protective rings and then packed in Bundles of 1 or 2 Tons & batch numbers given.