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Pump Shaft Torque calculation

  1. Dec 3, 2015 #1
    Attempting to determine the torque on the shaft of a pump. Known values are flow rate, RPM, and shaft diameter.

    1. What other values are needed to make the calculation?

    2. What is the equation I can use for this?
  2. jcsd
  3. Dec 3, 2015 #2


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    Science Advisor
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    Gold Member

    1) Pressure and Efficiency I think.

    Output power = pressure * flow rate
    Input power = output power/efficiency
    Input power = Torque * Angular velocity

    Make sure you are consistent with the units.
  4. Dec 4, 2015 #3


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    Staff: Mentor

    Is the pump itself known or are you trying to pick one? You don't necessarily need to calculate or pick the rpm.
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