AutoEngCalc - Engineering Calculators

Pump Affinity Laws Calculator

Predict pump performance changes with speed and impeller diameter variations

Pump Affinity Laws Calculator

Analyze the effects of speed and impeller diameter changes on pump performance

Affinity Laws Calculator

Calculate pump performance changes based on speed and impeller diameter

Pump Affinity Laws Reference

Speed Changes

When pump speed changes (RPM) while keeping impeller diameter constant:

  • Flow rate (Q): Q2/Q1 = N2/N1
  • Head (H): H2/H1 = (N2/N1)2
  • Power (P): P2/P1 = (N2/N1)3

Impeller Diameter Changes

When impeller diameter changes while keeping speed constant:

  • Flow rate: Q2/Q1 = D2/D1
  • Head: H2/H1 = (D2/D1)2
  • Power: P2/P1 = (D2/D1)3

System Curve Analysis

The system curve represents the relationship between flow rate and head loss: H = Hstatic + kQ2, where Hstatic is the static head and k is the friction factor.