Also all safety relief valve line branch line and tubing line for instrument will be dried and purged.
此外，所有安全卸压阀、支线和仪表管线应进行干燥和吹扫处理。
The layout of a new process line for tubing threading is introduced in the paper.
介绍了加工油管螺纹的一种新的工艺线的布置方式。
A device used on a sand line in the tubing of an oil well to scrape the wax off the tubing.
用捞砂绳下入油井的油管中以刮去油管壁上的结蜡所用的装置。
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