Pump Efficiency Formula


Equation for calculate pump efficiency is,

Ep = (γ × Q × Ht) / Pi : [for SI units]
Ep = (γ × Q × Ht) / (bhp × 550) : [for U.S. customary units]

where,
  • γ - specific weight of water
  • Q - Capacity
  • Ht - total dynamic head
  • Pi - power input
  • bhp - brake horsepower
  • Ep - pump efficiency, dimensionless