EN ISO 21809-1:2018 石油和天然气工业.管道运输系统中使用的埋设管或海底管道外涂层.第1部分:聚烯烃涂层(3层PE和3层PP)
Petroleum and natural gas industries - External coatings for buried or submerged pipelines used in pipeline transportation systems - Part 1: Polyolefin coatings (3-layer PE and 3-layer PP) (ISO 21809-1:2018)