ISO 21809-1-2011
石油和天然氣工業.管道運輸系統用埋設或水下管道用外部涂層.第1部分:聚烴烯涂層(3-層聚乙烯和3-層聚丙烯)
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)