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What are the affinity laws?

April 26, 2017affinity Laws

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What are the affinity laws?

2 Answers

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The affinity laws express the mathematical relationship between several variables involved in pump performance. They apply to all type of centrifugal and axial flow pumps running in laminar flow condition. • when speed changes and impeller diameter remains the same: Q1/Q2 = N1/N2; H1/H2 = (N1/N2)2; P1/P2 = (N1/N2)3. • when impeller diameter changes and speed remains the same: Q1/Q2 = D1/D2; H1/H2 = (D1/D2)2; P1/P2 = (D1/D2)3.

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The affinity laws of centrifugal pump performance express the effect, in mathematical equations, on pump performance due to changes in certain application variables. The affinity law variables which affect pump performance are: 1. RPM revolutions per minute. 2. Impeller diameter.