Fluid Mechanics · worked example

Pump power for 250 m³/h at 100 m head (water)

Hydraulic, shaft, and motor power for a centrifugal pump moving 250 m³/h of water against 100 m of head, at 70 % pump and 95 % motor efficiency.

Inputs

Flow rate	250 m³/h
Differential head	100 m
Specific gravity	1
Pump efficiency	70 %
Motor efficiency	95 %

Result

Pump shaft (brake) power	97.288 kW
Pump shaft power	130.465 hp
Hydraulic power	68.102 kW
Recommended min motor	107.02 kW
Motor electrical input	102.409 kW

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

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