Pump Affinity Laws Calculator

Estimate pump flow, head, and power after speed and impeller-diameter changes.

Formula

Q∝ND³; H∝N²D²; P∝N³D⁵

Source / method note

Uses University of Florida affinity-law relations for the same or geometrically similar pumps.

Legal / official rate note

Pump selection, cavitation, and motor sizing must use manufacturer curves.

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