How to Calculate Pump Shaft Torque from Flow Rate, RPM, and Diameter?

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SUMMARY

The discussion focuses on calculating pump shaft torque using flow rate, RPM, and diameter. Key equations include Output Power = Pressure * Flow Rate and Input Power = Output Power / Efficiency. Additionally, Input Power is defined as Torque * Angular Velocity. It is crucial to maintain consistency in units throughout the calculations. The need for pressure and efficiency values is emphasized to complete the torque calculation.

PREREQUISITES
  • Understanding of fluid dynamics principles
  • Familiarity with pump performance metrics
  • Knowledge of torque and angular velocity relationships
  • Ability to perform unit conversions accurately
NEXT STEPS
  • Research the relationship between pressure and flow rate in pumps
  • Learn about pump efficiency and its impact on performance
  • Study the calculation of angular velocity from RPM
  • Explore different types of pumps and their torque characteristics
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Mechanical engineers, fluid dynamics specialists, and anyone involved in pump design and performance optimization will benefit from this discussion.

Zarathuztra
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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?
 
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1) Pressure and Efficiency I think.

2)
Output power = pressure * flow rate
Input power = output power/efficiency
Input power = Torque * Angular velocity

Make sure you are consistent with the units.
 
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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