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Info Hub

Info Hub


Castle Pumps Ltd are a market leader in the marine and industrial pump industry and therefore have vast amounts of knowledge on pumps, and the like. This section of the website provides you with information to help you with your pump selection process, ensuring that the specifications you require are met. The info hub also provides pump aftercare information and handy tools such as unit conversion!

Positive Displacement vs Centrifugal Pumps

Positive Displacement vs Centrifugal Pumps

There are two main families of pumps; positive displacement and centrifugal (rotodynamic) pumps, both of which have their uses and best areas of application. It is important however to be able to identify when each pump type should be selected, which ultimately comes down to their working principle and the application at hand. This guide talks through those differences and gives examples of when one is more suited than the other.

Learn when to pick which pump type

Self-Priming vs Submersible Pumps

Self-Priming vs Submersible Pumps

Submersible pumps are the easy option, but have you ever considered choosing a self-priming pump as an alternative? Self-priming pumps are often overlooked and sometimes not even considered in the first place, but these pumps have a number of advantages. We look at liquid handling, maintenance comparisons and differences in design, before summarising why we believe self-priming pumps to be a good alternative to submersible.

Why self-priming is a good alternative

Screw Pumps vs Gear Pumps

Screw Pumps vs Gear Pumps

For applications involving the transfer of fuels, oils and other lubricating fluids, screw pumps and gear pumps are usually the pumping technology selected. Whilst a gear pump is a more than acceptable option for the handling of lubricating fluids, the design of the screw pump has several advantages over it.

Why to choose a screw pump

Progressive Cavity Pump Guide

Progressive Cavity Pump Guide

Progressive cavity pumps are a type of positive displacement pump known for their ability to handle viscous, shear sensitive and abrasive mediums at high pressures, with a smooth, low pulsating flow. Our progressing cavity pump guide includes technical information on the working principle of this pump type, benefits of the eccentric screw pump design and applications that the design is most suitable for.

Read our progressive cavity pump guide

Peristaltic Pump Guide

Peristaltic Pump Guide

Peristaltic pumps are a popular choice for applications where other pump types fail to meet the requirements i.e. highly viscous or solid laden mediums. In addition, the wide variety of materials that the inner tube is available in, along with the peristaltic hose pump’s seal-less design, means that even aggressive chemicals can be handled.

Read our peristaltic pump guide

Rotary Vane Pump Guide

Rotary Vane Pump Guide

Rotary vanes pumps are part of the positive displacement pump family, designed for the transfer of clean low to medium viscosity fluids and fuels at relatively low pressures. Our sliding vane pump guide covers technical information concerning the mechanism by which the vane pump operates, advantages of the pump’s design and typical applications that vane pumps are often used for. Also included is a trouble shooting guide.

Read our rotary vane pump guide

Flexible Impeller Pump Guide

Flexible Impeller Pump Guide

Flexible impeller pumps are a type of positive displacement pump, designed for the low pressure transfer, filling and dosing of a wide variety of fluids including shear sensitive and those containing solids. Our guide to the flexible vane pump design covers its working principle, benefits of the design and the applications that they are commonly used for. Also included is an impeller compatibility chart that determines the fluids each impeller type can be used with.

Read our flexible impeller pump guide

Side Channel Pump Guide

Side Channel Pump Guide

Side channel pumps have a working principle that is a middle ground between the two main pump families; centrifugal and positive displacement. They are designed for low flow, high pressure applications concerning low viscosity, clean fluids including those being handled at high temperatures and containing a level of gas. This guide provides information on the design benefits and applications that these pumps are suited to.

Read our side channel pump guide

Air Operated Diaphragm Pump Guide

Air Operated Diaphragm Pump Guide

Air operated diaphragm or AODD pumps as they are also referred to as, are a type of reciprocating positive displacement pump that are powered by compressed air rather than an electric motor that most other pump designs are. They are a versatile design capable of handling low and high viscosity fluids, including those with solids and more aggressive chemicals. Read this guide for more information on their working principle.

Read our AODD pump guide

Gear Pump Guide

Gear Pump Guide

Gear pumps are one of the most popular types of positive displacement pump; with internal and external variations. They are commonly used for the transfer of high viscosity oils and other lubricating fluids at relatively high pressures. This guide gives a detailed insight into the working principle of both external and internal gear pumps and the applications they are typically chosen for.

Read our gear pump guide

Multistage Pump Guide

Multistage Pump Guide

Due to their relative simplicity of design, centrifugal pumps are the most common pump type in the market. Centrifugal pumps are categorised into either single or multistage pumps, both of which have their uses. What is important to understand is where which should be selected, which ultimately comes down to their working principle and the application in question.

When a multistage pump should be selected


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