Pneumatic power tongs control system

Details Pneumatic power tongs control system Pneumatic power tongs control system

E - Fixed Constructions

21

B

255/14.7

E21B 19/16 (2006.01) B23P 19/06 (2006.01)

Patent

CA 1211102

ABSTRACT OF THE DISCLOSURE The power tongs control systems described herein include a hydraulic load transducer in the tongs snub line, the transducer output controlling a shunt valve between the hydraulic lines leading to and from the tongs drive motor. At a predetermined threshold tongs torque, a switch means is actuated by a Bourbon tube connected to the transducer output. Actuation of the switch means results in opening of the shunt valve, thereby halting operation of the tongs. A delay device is provided to maintain the tongs in the disabled configuration for a period of time following initial cut off. Also disclosed is an adjustable choke valve in series with the shunt valve so that even following the opening of the shunt valve, substantial torque is maintained upon the pipe by the tongs.

452498

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