1·Do not stand behind rig tongs while they are in use.
上卸扣时，不能站在大钳的后边。
2·Rig tongs must be kept clean to ensure proper operation.
大钳必须保持清洁确保正确操作。
3·Connect the makeup line (s) and snub line to the rig tongs.
连接猫头绳和钳尾绳到大钳上。
4·The rig tongs must be kept clean at all times and kept well lubricated.
任何时候钻具大钳都应该保持干净和良好的保养。
5·The Floormen remove the rig tongs and tie them back safely out of the way.
钻工打开大钳，放置到安全位置并拴牢。
6·Snub lines for the rig tongs must be inspected at regular intervals and be in good working condition.
必须定期检查大钳尾绳，使其处于良好的备用状态。
7·Hanging lines for the rig tongs must be inspected at regular intervals and be in good working condition.
必须定期检查大钳悬吊绳，使其处于良好的备用状态。
8·Install the make-up line (s) and snub line to the rig tongs. The snub line should be at least twice the size of the tong line.
装上大钳锚头绳和钳尾绳，钳尾绳的外径至少是大钳锚头绳的两倍。
9·Fit the rig tongs with the correct jaws for the drill pipe tool joint or the drill collar. Re-install the safety lock springs.
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。
10·The rig tongs hinge pin, latch lock and springs must be inspected at regular intervals and changed out if excessive wear is encountered.
必须定期检查大钳的折页销子，扣合头和弹簧，如果出现磨损超标，就更换。