Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

Alternating Pumps

Sponsored Links

Critical systems should always be equipped with more than one pump. Choosing between the installation of one or more backup pumps depends on the costs of the installation and

  • how critical the operation of the system is - a water supply system for a hospital is more critical than a chilled water cooling systems for a home
  • the delivery and installation time of a new pump

If two or more pumps are used, the operation between the pump should be systematically alternated to achieve equal wear.

Alternatives for Alternating Pumps

Pumps can be systematically alternated by

  • manual alternation - where the operator selects the lead pump and the sequence of the lag pumps
  • duty alternation - where the lead pump change every time the pump or system is stopped
  • timed alternation - where the lead pump is switched by a timer or clock
  • equal run time - where the lead pump is switched to achieve the same operating time for each pump

Note! Running an automatic system for equalizing the wear of the pumps

  • has the advantage of extending the time before repair and reinvestments
  • has the disadvantage that all pumps may wear out on at the same time - reducing the operation safety for the whole system
Sponsored Links

Related Topics


Design of pumping systems and pipelines. With centrifugal pumps, displacement pumps, cavitation, fluid viscosity, head and pressure, power consumption and more.

Related Documents

Centrifugal Pumps

An introduction to Centrifugal Pumps.

Centrifugal Pumps - Stable and Unstable Flow

The characteristics of stable and unstable flow.

Positive Displacement Pumps

Introduction tutorial to positive displacement pumps basic operating principles.

Pumps - Classifications

Centrifugal pumps vs. positive displacement pumps.

Pumps - Parallel vs. Serial Arrangement

Adding head and flowrate for pumps arranged in parallel vs. serial.

Reliability of Machine Components

Mean Time Between Failure - MTB and reliability of machine components and systems.

Sponsored Links

Search Engineering ToolBox

  • the most efficient way to navigate the Engineering ToolBox!

SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - 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!


We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.