... /Gas steel pipe machine 1.Pipe size: 219-2800mm 2.Patent product 3.API - 5L,GB9711.1,GB9711.2 Standards Oil/Gas steel pipe machine ... Swing Short Machine Unit inWelding Tractor style with continuous production capability. Diameter range of final pipe line products could ... GB9711.1, GB9711.2 Standards.Our company also assists pipe line manufacturing firms in layout, planning and design of products ...