`Q_f = 48.46*( "Rotary Speed" * "Torque" )/( "Engine efficiency" * "Fuel heating" )`
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This equation is used to calculate the fuel consumption of an engine used to drill for oil and gas.
Where:
- `Q_f` = Fuel Consumption rate in lb/hr
- N = rotary speed of engine in revolution per minute, rpm
- T = output torque, ft-lb
- n = engine efficiency
- H = fuel heating value in BTU/lb