Fluid Mechanics · worked example

Pump power for 100 m³/h at 50 m head (water)

Hydraulic, shaft, and motor power for a centrifugal pump moving 100 m³/h of water against 50 m of head, at 70 % pump and 95 % motor efficiency.

Inputs

Flow rate	100 m³/h
Differential head	50 m
Specific gravity	1
Pump efficiency	70 %
Motor efficiency	95 %

Result

Pump shaft (brake) power	19.458 kW
Pump shaft power	26.093 hp
Hydraulic power	13.620 kW
Recommended min motor	24.32 kW
Motor electrical input	20.482 kW

These values are computed by the Pump Sizing (API 610) calculator. Open the tool to change any input.

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