GB/T 26255.2-2010 Mechanical fittings for polyethylene piping systems for the supply of gaseous fuels—Part 2:Metal fittings for pipes of nominal outside diameter greater than 63 mm

Scope

This part of GB 26255 specifies the terms and definitions, symbols and abbreviations, materials, general requirements, performance requirements, test methods, marking and labeling, and packaging, transportation, and storage for mechanical fittings used to connect PE pipes to metal pipes or fittings in gas polyethylene piping systems that meet the requirements of GB 15558, where the nominal outer diameter of the PE pipes is greater than 63 mm.
This part applies to steel-plastic conversion fittings, where the bearing component is a metal part. It specifies their end load-bearing capacity. This part stipulates that steel-plastic conversion fittings be used with PE pipes in gas transmission systems, including steel-plastic direct fittings, elbows, flanges, and three-way steel-plastic conversion fittings, with the joints being either permanent or detachable. Steel-plastic conversion fittings and metal pipes or fittings can be assembled using flange or welded connections.
The working temperature range for the steel-plastic conversion fittings specified in this part is -20 ℃ to +40 ℃.
The purpose of the performance requirements in this part is to ensure the sealing performance and load-bearing capacity of the connection joints between steel-plastic conversion fittings and PE pipes, so that when the mechanical joints are subjected to tensile or pressure loads, the PE pipes will yield first and not be pulled out.

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