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Rotational Speed - Affinity Laws

The affinity laws lay down the dependency of hydraulic characteristic data of centrifugal pumps on the pumps rotational speed.

The affinity laws are applicable to friction-less systems with incompressible liquids. They are to be viewed as empirically suitable for technical application.

1st Model Law

2nd Model Law (Squared Law)

3rd Model Law (Cubed Law)

  • Q = Flow
  • H = Head
  • P = Power Input
  • n = Speed

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