Fluid Mechanics · worked example

Pump power for 100 m³/h at 80 m head (water)

Hydraulic, shaft, and motor power for a centrifugal pump moving 100 m³/h of water against 80 m of head, at 70 % pump and 95 % motor efficiency.

Inputs

Flow rate	100 m³/h
Differential head	80 m
Specific gravity	1
Pump efficiency	70 %
Motor efficiency	95 %

Result

Pump shaft (brake) power	31.132 kW
Pump shaft power	41.749 hp
Hydraulic power	21.793 kW
Recommended min motor	35.80 kW
Motor electrical input	32.771 kW

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

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