Calculate water pump flow rate, head pressure, and power consumption based on impeller size and engine RPM.
Input Parameters
Results
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Flow Rate
GPM
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Head Pressure
psi
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Pump Power Draw
HP
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Effective Pump RPM
RPM
Note: Water pump flow scales with RPM (affinity laws). Cavitation occurs if inlet pressure drops too low at high RPM. Electric water pumps allow independent flow control.
Reference
Pump RPM = Engine RPM × Pulley Ratio
Flow ≈ k × D² × RPM (affinity laws)
Head Pressure (psi) = Head (ft) × 0.433
Pump HP = (GPM × PSI) / (1714 × Efficiency)
Typical pump efficiency: 50-60%