OCTG, which including tubing, casing, line pipe, etc.

石油专用管，包括油管、套管、管线管等。

To install static electricity arresters on the line pipe;

在管路上安装静电消除器；

The results are significant to safety design for X70 line pipe.

研究结果对X70管线钢的安全设计具有重要意义。

This final operation is the"pullback"and installs the line pipe under the river.

这最后的操作叫“拖管”，它使管道就位于河床下面。

It introduces characteristic and kinds of line pipe for petroleum and natural gas transmission.

简要介绍了石油天然气输送用管线钢管的种类及其特点。