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iso3183 l450 psl2 line pipe Ministry of Commerce of the P.R.China - China Commodity Net
ANSI/AWWA C104/A21.4 American National Standard for Cement-Mortar Lining for Ductile-Iron Pipe and Fittings for Water ISO 21809 Petroleum and natural gas industries -- External coatings for buried or submerged pipelines used in pipeline transportation systems DIN 30670 Polyethylene coatings of steel pipes and fittings