Torque Measurement

Yes, in specific configurations. In oil field pipe makeup operations, a dynamometer is commonly used in a 3:1 ratio setup to indirectly measure the torque applied during pipe joint tightening. The linear pull force on the tong handles — measured by the dynamometer — is converted to a torque value using the known moment arm length and mechanical advantage ratio. This method requires a dynamometer calibrated to the appropriate capacity with a current NIST-traceable certificate.

The standard oil field torque measurement setup uses a Dillon AP dynamometer inline in the tong line — the cable connecting the hydraulic tong to its anchor point. The dynamometer measures the pull force in this line; that force, multiplied by the effective moment arm and the 3:1 mechanical advantage ratio, gives the torque at the pipe joint. Dynamic Measurement Systems can advise on the appropriate dynamometer capacity for your pipe size and torque specification.

Torque (ft-lb) = Force (lb) × Moment Arm (ft) × Mechanical Advantage Ratio. In a standard 3:1 tong setup with a 3-foot moment arm and 1,000 lb dynamometer reading: 1,000 × 3 × 3 = 9,000 ft-lb. The exact calculation depends on the specific tong configuration. Contact Dynamic Measurement Systems at 281-405-0606 to confirm the correct method for your setup.