... 12-32mm, 16-50mm, 25-76mm, 32-89mm... diameter welded pipes. straight welded pipe production line: to produce 8-20mm, 12-32mm, 16-50mm, 25 ... -76mm, 32-89mm diameter welded pipes, with wall thickness as ... straightener →→Flying saw under computer-control →→ Run-out table. High Frequency Straight Welded Pipe Production Lines