Power tongs and control system

Details Power tongs and control system Power tongs and control system

E - Fixed Constructions

21

B

166/60

E21B 23/00 (2006.01) E21B 19/16 (2006.01)

Patent

CA 1237664

ABSTRACT A control system for power tongs comprises two tongs torque limiters, one of which limits tongs torque to a very low (hand-tight) level; the other limits torque at full makeup to, for example, 2000 ft. lb. The hand-tight torque limiter is manually or automatically disabled after the hand-tight level is reached. The system enables the operator to verify that the threads are properly engaged before applying full torque to the connection. The tongs have a very high reduction ratio, so that torque rises very slowly and can be more accurately controlled.

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