Pumps - Power Calculator

Calculate pump hydraulic and shaft power

 Hydraulic Pump Power

The ideal hydraulic power to drive a pump depends on

  • the mass flow rate the
  • liquid density
  • the differential height

pump power si imperial units

- either it is the static lift from one height to an other or the total head loss component of the system - and can be calculated like

Ph(kW) = q ρ g h / (3.6 106)            (1)

where

Ph(kW) = hydraulic power (kW)

q = flow capacity (m3/h)

ρ = density of fluid (kg/m3)

g = gravity (9.81 m/s2)

h = differential head (m)

The hydraulic Horse Power can be calculated as:

Ph(hp)Ph(kW) / 0.746         (2)

where

Ph(hp) = hydraulic horsepower (hp)

Example - Power pumping Water

1 m3/h of water is pumped a head of 10 m. The theoretical pump power can be calculated as

Ph(kW) = (1 m3/h) (1000 kg/m3) (9.81 m/s2) (10 m) / (3.6 106)

    = 0.027 kW

Shaft Pump Power

The shaft power - the power required transferred from the motor to the shaft of the pump - depends on the efficiency of the pump and can be calculated as

Ps(kW) Ph(kW) / η            (2)

where

Ps(kW)  = shaft power (kW)

η = pump efficiency

Online Pump Calculator - SI-units

The calculator below can used to calculate the hydraulic and shaft power of a pump:

q - flow capacity (m3/h)

ρ - density of fluid (kg/m3)

g - gravity (m/s2)

h - differential head (m)

η - pump efficiency

Online Pump Calculator - Imperial units

The calculator below can used to calculate the hydraulic and shaft power of a pump using Imperial units:

q - flow capacity (gpm)

 γ - specific weight of fluid (lb/ft3)

g - gravity (ft/s2)

h - differential head (ft)

η - pump efficiency

Related Mobile Apps from The Engineering ToolBox Engineering Toolbox Apps

- free apps for offline use on mobile devices.

pump shaft power

Related Topics

  • Pumps - Piping systems and pumps - centrifugal pumps, displacement pumps - cavitation, viscosity, head and pressure, power consumption and more

Related Documents

Tag Search

  • en: pumps power online calculator flow pressure head
  • es: bombas de presión de cabeza de la energía del flujo calculadora en línea
  • de: Pumpen Strom Online-Rechner Fließdruck Kopf

Search the Engineering ToolBox

- "Search is the most efficient way to navigate the Engineering ToolBox!"

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your SketchUp model with the Engineering ToolBox - SketchUp Extension/Plugin - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!

Translate the Engineering ToolBox!
About the Engineering ToolBox!

Support the ToolBox

If you find the Engineering ToolBox useful and want this website to be available tomorrow - and the days after tomorrow - enable ads or make a contribution!

Contribute to the Engineering ToolBox

close