Pump Shaft Power

Shaft power from hydraulic power and pump efficiency.

App id: FLUID-15. Reference version 1.0.

How to fill it

Fill the inputs. The tool shows the outputs.

On the tool screen, Calc is the working sheet. Presets stores values you reuse. Reference is the formula, assumptions, and provenance below.

Formula

P_shaft = P_h / η

Inputs

Name	Unit
Pump efficiency	`%`
Hydraulic power (optional)	`kW`
Volumetric flow (optional)	`m3/s`
Pump head (optional)	`m`
Density (optional)	`kg/m3`
Gravity (optional)	`m/s2`

Outputs

Name	Unit
Shaft power (hero result)	`kW`
Hydraulic power	`kW`

Diagnose

Observations are context. They do not pass or fail a structure. See Diagnose.

When	Observation	Severity
`Pump efficiency > 1.02`	Efficiency above 100%	warning
`Pump efficiency > 1`	Efficiency slightly above 100%	caution
`Pump efficiency < 0.5`	Low mechanical efficiency	caution

Assumptions

Supply hydraulic power, or flow + head + density.
Efficiency is a decimal fraction (80% → 0.80).

Provenance

η = P_h / P_shaft at the same operating point.