BS EN ISO 21809-1:2018
石油和天然气工业 管道运输系统中使用的埋地或水下管道的外部涂层 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. Polyolefin coatings (3-layer PE and 3-layer PP)