Affinity laws

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  1. You can quickly determine the effect of changes in either pump speed or impeller diameter on pump performance.
  2. RPM1 and Diameter1 are the original conditions.
  3. RPM2 and Diameter2 are for the new conditions.
  1. Results are valid for small changes (+/- 5 to 10) in speed and impeller diameter.
  1. GPM8, Goulds Pump Manual, Copyright 2004 Goulds Pumps, Marketing Communications, ITT Industries, 717.

Step 1: Affinity Laws
1.1 Flow (gpm)
1.2 Head (ft)
1.3 Power (hp)
1.4 RPM1
1.5 Diameter1 (in)
1.6 RPM2
1.7 Diameter2 (in)
Step 2: Solve
2.1 Proof steps
2.2 Solve for Affinity Laws
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