Fluid Mechanics · worked example

Pump power for 20 m³/h at 30 m head (water)

Hydraulic, shaft, and motor power for a centrifugal pump moving 20 m³/h of water against 30 m of head, at 70 % pump and 95 % motor efficiency.

Inputs

Flow rate	20 m³/h
Differential head	30 m
Specific gravity	1
Pump efficiency	70 %
Motor efficiency	95 %

Result

Pump shaft (brake) power	2.335 kW
Pump shaft power	3.131 hp
Hydraulic power	1.634 kW
Recommended min motor	2.92 kW
Motor electrical input	2.458 kW

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

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