Pump Affinity Laws Calculator
Calculate pump performance changes with speed or impeller diameter variations
About this calculator
The Pump Affinity Laws Calculator helps engineers and technicians predict how centrifugal pump performance changes when operating conditions are modified. This tool applies the fundamental affinity laws to calculate new flow rates, head pressures, and power requirements when pump speed or impeller diameter changes. It's essential for pump sizing, system optimization, energy efficiency analysis, and troubleshooting applications where pump modifications are being considered.
How to use
Enter your current pump parameters including flow rate, head, power, speed, and impeller diameter. Input the new speed or impeller diameter you want to evaluate. The calculator will instantly compute the corresponding changes in flow rate, head pressure, and power consumption using the pump affinity laws equations.
Frequently asked questions
What are pump affinity laws?
Mathematical relationships that describe how centrifugal pump performance (flow, head, power) changes proportionally with variations in impeller speed or diameter under similar operating conditions.
When should I use this calculator?
Use it when considering speed changes via VFDs, impeller trimming, or diameter modifications to predict resulting pump performance and energy consumption changes.
Are affinity laws accurate for all pumps?
Affinity laws work best for centrifugal pumps with similar geometric shapes and are most accurate for moderate changes in speed or diameter.