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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!

Pump ordering guide

Pump ordering guide

With so many pump types, material options and performance specifications it can be difficult to ensure you are buying the right pump - and with factors such as application suitability and pump lifespan also to consider, the purchasing process can be even more difficult. So if you're unsure on the exact pump you require, Castle Pumps have put together the 'pump ordering guide' to help you find a pump that meets your specific requirements.

Read our pump ordering guide

Pump specification form

Pump specification form

To make it as easy as possible for the customer, Castle Pumps have devised a pump specification form that prompts the user for the information required to specify a pumping solution that matches their requirements. Upon receipt of the form, Castle Pumps would devise a technical solution, which may include more than one offering, that would then be provided to the customer for verification.

Download specification form

Pump maintenance – why when and how!

Pump maintenance – why when and how!

Pumps are a key part of any industrial plant or factory and downtime of a pump can be costly. Therefore, it's important for pump maintenance to be carried out so that downtime can be limited. There are two classifications of pump maintenance; corrective and preventive. Despite corrective maintenance being a quick solution to a problem, it doesn't deal with preventing it from happening again, whereas preventive maintenance does.

Read more about pump maintenance

How to read a pump curve

How to read a pump curve

Pump curves are essential during the decision making process, as they provide the information you need in order to see whether the pump will perform how you need it to! In their most basic form, performance curves contain flow rate and pressure data. Being able to read a pump curve enables you to choose the right pump, rather than choosing one that could potentially cause damage, consume unnecessary energy or perform poorly.

Read more on understanding pump curves

How to calculate head loss in a system

How to calculate head loss in a system

Head loss is an essential part of the preparation of looking for a pump with specific requirements. These head losses - also known as pressure losses - are sustained by the fluid as it flows through the pump and therefore can affect the pumping operation. Being such an important factor when making the decision on which pump to purchase, we have created this section for you to calculate the head loss within your application.

Read how to calculate head loss

Unit conversion tool

Unit conversion tool

A unit conversion tool for you to change product specifications into the units that you work with and know best. No more searching the internet for conversion tools that aren't precise or that you can't rely on, and no more trying your hand at tricky maths equations to figure it out. Here at Castle Pumps we've got it covered in just a few clicks!

Start using the unit conversion tool

Positive displacement vs centrifugal

Positive displacement vs centrifugal

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

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

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 AOD 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 AOD 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


      Castle Pumps are fully accredited to enable you to buy with confidence. Our accreditation includes:

Our accreditation