Clean devices which cannot stand washing and the pipe section which may have dirt and sundries left after washing such as filters or dirt separators.
对不能经受冲洗的设备和冲洗后可能存留脏物、杂物的管道段，如过滤器及除污器等，要进行清理。
Lead and backup tong-men should not stand between the two pipe tongs while the driller is making up or breaking out pipe or collars.
当司钻正在上卸钻杆和钻铤时，内外钳工不要站在两个大钳之间。
The backflow preventer must be supported and is not designed to carry full weight of the stand pipe.
防回流阀必须有所支撑， 不能用于承载立管的全部重量。
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