All rig personnel should not energy to tighten or loosen unions or other connections of pipe under pressure.
任何井队人员都不能在带压力的情形下松紧由壬或其他管线的连接。
All rig personnel should not attempt to tighten or loosen unions or other connections of pipe under pressure.
任何井队人员都不能在带压力的情况下松紧由壬或其他管线的连接。
This pressure must be under control, and we control it by means of the mud which we circulate down the drill pipe.
这种压力必须加以控制，我们让泥桨顺着钻杆向下循环，用这种方法来控制压力。
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