Putting it together

The flow x pressure requirement is the pump’s duty point.

With this information, you can choose the specific pump that can deliver your required duty point. This is done by using pump curves:

  • X axis is the Q, which is flow in m3/h (gpm).

  • Y axis is the H, being the total head in meters (feet).

Let’s look at an example using typical published pump curves. If we have a head requirement of 103 m (338 ft), and a flow requirement of 212 m3/h (933 gpm), we can find where the points intersect to determine the appropriate pump.

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