SY/T 6769.2-2010 Specifications for the disign,construction and acceptance of non-metallic pipelines.Part 2:Steel framed polyethylene composite pipes (English Version)
2018SY/T 6769.2-2018 Specifications for the design, construction and acceptance of non-metallic pipelines Part 2: Steel skeleton reinforced polyethylene composite pipes
2010SY/T 6769.2-2010 Specifications for the disign,construction and acceptance of non-metallic pipelines.Part 2:Steel framed polyethylene composite pipes