This part of GIS/PL2 applies to equipment for butt jointing polyethylene (PE) pipes, 90 mm to 630 mm inclusive nominal diameter, conforming to GIS/PL2-2 or GIS/PL2-8.It specifies general requirements for automatic butt fusion machines including specific design features of the chassis and clamps, the interface force transmission, the trimming tool, the heater plate and the application of automatic control. This Gas Industry Standard also gives guidance on ancillary equipment, and specifies testing and acceptance procedures and maintenance schedules to ensure that high quality equipment is available for butt fusion jointing.