关于海底管道补口规范里面的两句话，哪位大侠帮忙翻译翻译呀

Coating applied in a factory to individual pipe lengths is often referred to as “linepipe coating” (or “factory coating”), see DNV-RP-F106. In this document, “parent coating” is sometimes used synonymous with linepipe coating.


其中，让我最不明白的就是“linepipe coating”是管线管涂层吗，是个什么意思呀，还有“parent coating”是个什么涂层呢，这是关于海底管道补口的一个规范里的内容，文章中总是出现，实在是混不过去了，求各位大侠帮助，谢谢谢谢