NF A49-721-3/A1*NF EN ISO 21809-3/A1:2020
石油和天然氣工業 管道運輸系統中使用的埋地或水下管道的外部涂層 第3部分:現場接縫涂層 修正案 1:引入網狀涂層系統
Petroleum and natural gas industries - External coatings for buried or submerged pipelines used in pipeline transportation systems - Part 3 : Field joint coatings - Amendment 1 : introduction of mesh-backed coating systems