Engineering Asked by Andrew Cone on April 20, 2021
Well pump manufacturers publish "efficiency curves" for well pumps, such as this one (the curve that is most sharply convex down, whose Y axis is read from the "% EFF" scale on the right hand side):
The well pumps are usually sold with a name that reflects the flow rate that yields peak efficiency. So this one is called a "33GS" because it is most efficient at 33 GPM.
These pump curves typically presume a motor speed of 3450 RPM. How might I expect the curve to shift or stretch if the motor speed changes? I’m particularly interested in the range from about 2800 RPM to 3600 RPM.
It is not possible to answer your question as you are missing a vital component. "Head"
The flow rate depends on the head as well as the speed of the pump. So it will have a given flow rate at a certain speed and head.
Answered by Brad on April 20, 2021
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