safety spring
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钻工取下安全弹簧和大钳销子换上合适尺寸的钳头以匹配钻杆或管子的尺寸。
The Floormen remove the safety latch springs and the tong pins and change the tong jaws to match the size of the pipe or tubular to be made up.
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司钻要确保大钳销钉上的安全锁定弹簧被放到原位。
The Driller ensures that the safety latch springs are replaced on the tong pins.
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