给大钳装上与钻杆接头或钻铤相匹配的钳头，再装上安全锁簧。
Fit the rig tongs with the correct jaws for the drill pipe tool joint or the drill collar. Re-install the safety lock springs.
推导出气瓶圆筒段、封头、接头和内衬的设计计算公式。
Calculating formulae for design of cylinder, dome, joint and liner of natural gas cylinder are derived.
在拧卸钻杆时为了保护动力头钻杆接头，防止其磨损，通常的做法是在该接头处联接一个保护接头。
A protecting joint is added at power head rod joint in order to prevent power head rod joint abrasion when rod is screwed or unscrewed.
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