... station pipelines, heating system pipelines, general-purpose pipelines, vessels manufacturing, mechanical engineering and instrumental engineering. Process ERW (Electric Resistance ... and SeamlessDIN 2458 WELDED STEEL PIPES AND TUBESAPI 5L Line Pipe Coating StandardANSI/AWWA C104/A21.4 American National ... cut and torch cut);beveled for welding (All line piping is square cut to the tolerance specified and ...