JIS G3469-2002 聚乙烯覆层钢管 1. Scope This Japanese Industrial Standard specifies the external poly ehylene coated steel pipes, hereinafter referred to as the "coated steel pipe s", mainly used for underground(1) services transporting gas, oil, water, et c. Note(1) The underground referred to herein includes the bottoms of ri ver, sea, etc. Remarks The standards cited in this Standard are as follows.