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This part of GB 26255 specifies terms and definitions, symbols and abbreviations, materials, general requirements, performance requirements, test method, mark and labels, packaging, transportation and storage for gas polyethylene pipe systems for connecting, to polyethylene (PE) pipes, a metal pipe or fitting, conforming to GB 15558, of nominal outside diameter greater than 63 mm. It is applicable to mechanical fittings in which all load-bearing elements of the joint are metal and specifies the anti-load capability at the end. This part specifies the fittings intended for use with PE pipes, including metal straight joint, elbow, flange, tee metal converter, these fittings producing either permanent joints or joints which can be dismantled. If it is intended for assembly with a metal pipe or fitting, such connections may be flanged or welded connections. This part is applicable only to mechanical fittings with normal operating-temperature limits between -20℃ and +40℃. It is the purpose of this part to provide performance requirements that will ensure full sealing and loading capacity of metal fitting and PE pipe connection joint so that the PE piping will yield rather than pull out of the mechanical joint when subjected to tensile forces or pressure.