Skip to main content

learn.howToCalculate

learn.whatIsHeading

Pump power requirement is calculated from flow, head, and efficiency. Proper sizing prevents under-pumping and excessive energy waste.

Formula

Calculate: P = (Q × H × ρ × g) / η
P
(GPM × Total Head) / (3960 × Efficiency) — (GPM × Total Head) / (3960 × Efficiency)
Q
Q value — Variable used in the calculation
H
H value — Variable used in the calculation

Guida passo passo

  1. 1Calculate: P = (Q × H × ρ × g) / η
  2. 2Or: P = (GPM × Total Head) / (3960 × Efficiency)
  3. 3Account for motor losses beyond pump efficiency

Esempi risolti

Ingresso
Q = 0.05 m³/s, H = 20 m, ρ = 1000 kg/m³, η = 0.75
Risultato
P ≈ 13 kW required
Select larger motor for margin

Errori comuni da evitare

  • Under-estimating system friction loss
  • Over-sizing pump (operates inefficiently at partial load)

Domande frequenti

Why does head matter more than volume?

Quadratic relationship with head; doubling head doubles power. Efficiency varies with duty point.

How do you select pump size?

Choose pump with duty point (Q, H) near best efficiency point for long equipment life.

Pronto per calcolare? Prova la calcolatrice gratuita di Pump Power

Provalo tu stesso →

Impostazioni

PrivacyTerminiInfo© 2026 PrimeCalcPro