Pump Affinity Law Explained

The Affinity Laws for centrifugal pumps are a set of mathematical relationships that allow you to predict how changes in speed (RPM) or impeller diameter will affect a pump's performance.

​They are incredibly useful tools in product design and fluid systems engineering because they let you calculate new performance metrics without needing to physically test a new setup every time.

​1. The Two Main Conditions

​The affinity laws are divided into two distinct scenarios: when you change the pump speed (with a constant impeller diameter) and when you change the impeller diameter (at a constant speed).

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