Measuring pressure across a centrifugal pump

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SUMMARY

To measure flow rate in a pipe with a Grundfos UPS 25-60 centrifugal pump, installing pressure gauges before and after the pump is essential. This setup allows for the calculation of flow rate using the differential pressure (DP) across the pump and the pump's head flow curve. An orifice plate is recommended to enhance measurement accuracy. Utilizing a look-up table based on these measurements will yield the system flow rate effectively.

PREREQUISITES
  • Understanding of centrifugal pump operation and characteristics
  • Familiarity with pressure gauge installation and usage
  • Knowledge of differential pressure measurement techniques
  • Ability to interpret pump head flow curves
NEXT STEPS
  • Research the installation and calibration of pressure gauges for accurate measurements
  • Learn about orifice plate design and its impact on flow measurement
  • Study the head flow curve of the Grundfos UPS 25-60 pump
  • Explore methods for calculating flow rate from differential pressure readings
USEFUL FOR

Engineers, technicians, and anyone involved in fluid dynamics or pump system design will benefit from this discussion, particularly those focused on optimizing flow measurement in centrifugal pump systems.

djohnson83
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This should be an easy one but here goes...

I am trying to easily measure flow rate in a pipe which has an in line centrifugal pump (Grundfos UPS 25-60) creating the head in the system. I have been told that installing a pressure gauge before and directly after the pump will give me system flow rate from a look-up table. Is this the case?

My recolection is that you need some kind of orifice plate in the flow and between the two gauges to get a useful reading.
 
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If you have the head flow curve for the pump you can calculate the head from the DP across the pump and from that look up the flow.
 

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