Additionally, have put forward the Suggestions in protectingcasing, saving workover fee, reducing costs and increasing economic benefits.
为今后如何进一步保护好套管，节省大修费用，降低成本，提高经济效益等方面提出了建议。
2
All devices for switching, protecting and controlling are installed on a base plate installed in a separate steel sheet casing.
所有的开关，保护，控制装置皆分别装置在各控制盘上。
3
The different protecting methods for the carrier pipes prevented with casing pipes from corroding during 1970s -1990s in the northeast China oil pipeline are respectively introduced.