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US 2011/0214477 A1Published application
Torque calibrating system
AssigneeNational Oilwell Varco, L.P.
InventorsNathan D. Gray, Joe Yates
Life of this patent
Estimating the term…
Abstract
Generally, the subject matter disclosed herein relates to torque calibrating systems. A torque calibrating system includes a torque arm having a first end and a second end, a stem positioned proximate the first end of the torque arm, the stem adapted to be removably and operatively coupled to a power tong, and a load cell adapted to be positioned proximate the second end of the torque arm.
Claims20
A torque calibrating system, comprising:
- a torque arm having a first end and a second end;
- a stem positioned proximate said first end of said torque arm, said stem adapted to be removably and operatively coupled to a power tong;
- and
- a load cell adapted to be positioned proximate said second end of said torque arm.
1 more element
A method of calibrating a hydraulically powered power tong, comprising:
- arranging a load cell to receive torque from the power tong;
- driving the power tong to apply torque to the load cell;
- monitoring an output of the load cell until a first predetermined torque value is registered at the load cell;
- determining a first hydraulic pressure supplied to the power tong when the first torque value is registered at the load cell;
- adjusting driving of the power tong to increase the torque applied by the power tong to the load cell;
- monitoring an output of the load cell until a second predetermined torque value is registered at the load cell;
- and
- determining a second hydraulic pressure supplied to the power tong when the second predetermined torque value is registered.
5 more elements
A method of calibrating a power tong, comprising:
- arranging a load cell in a throat of a power tong;
- coupling a pressure gage to a hydraulic line of the power tong;
- driving the power tong to apply torque to a load cell;
- monitoring an output of the load cell until a first predetermined torque value is registered at the load cell;
- recording a position of the pressure gage when the first torque value is registered at the load cell;
- adjusting driving of the power tong to increase the torque applied by the power tong to the load cell;
- monitoring an output of the load cell until a second predetermined torque value is registered at the load cell;
- and
- recording a position of the pressure gage when the second predetermined torque value is registered.
6 more elements
A method of calibrating a power tong, comprising:
- mounting a load cell on a torque arm;
- coupling a pressure gage to a hydraulic line of the power tong;
- driving the power tong to engage and apply torque to the torque arm so that the applied torque is transmitted to the load cell through the torque arm;
- monitoring an output of the load cell until a first predetermined torque value is registered at the load cell;
- recording a position of the pressure gage when the first torque value is registered at the load cell;
- adjusting driving of the power tong to increase the torque applied by the power tong to the torque arm;
- monitoring an output of the load cell until a second predetermined torque value is registered at the load cell;
- and
- recording a position of the pressure gage when the second predetermined torque value is registered.
6 more elements
Dependencies are inferred from the claim text.