Q: Should I select the “Consider Torque from Viscous Flow in Pump” option?

A: This is an option in PC-PUMP, but it uses a correlation which is based on very limited data. We suggest using this option with discretion. Try running it and see if the results make sense. When a pump is pumping a large volume of high viscosity fluid, the viscous torque can easily be 30% or more of the total torque. If the rates and viscosity are both low, the viscous torque should also be low. Due to the extremely limited data available to C-FER for checking the accuracy of this correlation, we recommend that users be careful in evaluating the results of this calculation. The program will always print an output message containing the calculated viscous torque.

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