A,  Performance,  Pumps & Compressors

Affinity Laws

Note: Q is flow; D is diameter; N is speed; and bhp is brake horsepower. Subscript “1” denotes initial conditions and subscript “2” denotes new conditions.

The mathematical relationships that predict how capacity, head, and horsepower are affected by changes in the centrifugal pump impeller, centrifugal compressor impeller, fan diameter, or shaft speed. These laws only apply to changes of less than 10% from the original design conditions.

See also Fan Laws.

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