Pump Performance Curve & System Curve
We recently wrote an article on how to read the information presented on a standard centrifugal pump performance curve and to develop this further we need to examine how this relates to the system curve. So, what is the system curve? This plots the head in terms of...
Utilising Inverters with Industrial Pumps
Utilising Inverters with Industrial Pumps Utilising inverters with industrial pumps. In the commercial building services sector, inverters are widely accepted however it would seem the industrial sector still have reservations when it comes to using Inverters to...
How to read a Centrifugal Pump Performance Curve
This may seem a basic topic but if new to selecting centrifugal pumps it is an essential skill to know. Pump manufacturers will supply a performance curve detailing the following information: flow, head, power absorbed, efficiency and NPSH required. On all curves some...
Factors affecting Pump Efficiency
The overall efficiency of a centrifugal pump is the product of three individual efficiencies: mechanical, volumetric, and hydraulic:…
Common Terms Used In The Pump Industry
Common terms used in the pump industry. Absolute pressure: The absolute pressure is the sum of the gauge or dial pressure and the atmospheric pressure (14.7psi). If your pump gauge reads 150 psi, then the absolute pressure will be 164.7 psi. Absorbed Power: This is...
Pump Affinity Laws
What are the Affinity Laws? The pump affinity laws are a set of formulas that help predict flow, head, power absorbed at different shaft speeds. If you know the shape of a pump performance curve at a certain speed or with a certain impeller diameter, you can use the...
A guide to Centrifugal Impellers
A guide to Centrifugal Impellers Centrifugal pump impellers come in many shapes and sizes, each having their own uses and advantages. There are two aspects of the impeller, regardless of the type, that are worth remembering: Impeller Diameter: The diameter of a...
Commonly Pumped Chemicals
Commonly Pumped Chemicals During a recent survey of all enquiries we received for chemical applications we found that around 50% were for a very small number of chemicals, so we thought it would be useful to run through these chemicals and list the suitable pump...
Mechanical Seal Selection
Mechanical seal selection - A technical briefing Crest offers many types of pumps with a variety of arrangements including magnetic drive, seal less and mechanical seals. There are several types of mechanical seal and whilst Crest can fit specific seal if required, it...
Understanding Viscosity – Technical Briefing
Understanding Viscosity When people talk about understanding viscosity, they are talking about one of two things: dynamic (also known as absolute) viscosity or kinematic viscosity. How to measure Viscosity One way is to measure a fluid’s resistance to flow when an...
Head v Pressure – Technical Briefing
Head v Pressure A History Lesson Around 400 years BC the Greek Philosopher Aristotle proposed a theory that, if dropped from the same height, a 10 kg rock would fall twice as fast as a 5 kg rock or, indeed, 10 times faster than a 1 kg rock. Seems logical? Well, he had...
Pumping solids? What is the best option.
What are the best options for pumping solids? Whilst pumping solids can create greater complications with pump reliability and longevity. Fortunately, there are many options available to you. And If specified correctly, the correct installation should work reliably...
What is the difference between NPSHa and NPSHr ?
What is the difference between NPSHa and NPSHr ? Let's start with what NPSHa and NPSHr mean. NPSHa stands for Nett Positive Suction AVAILABLE and NPSHr stands for Nett Positive Suction Head REQUIRED. Now, what is the difference between NPSHa and NPSHr? Well, firstly...
Thank you to the BPMA for publishing our article!
Thank you to the BPMA (https://www.linkedin.com/company/bpmapumps/) For publishing our article, “How Small Changes Could Lead to Far Bigger Energy Savings” in their Annual Buyers Guide and Directory. For your own copy / digital version of the guide, please click here...
How long should a chemical pump last?
How long should a chemical pump last? Crest Pumps built with a design life of 25 years. However, how long a chemical pump should last varies considerably dependant upon the application it has been built for. The 3 most important factors to consider are:...
Magnetic drive pump. How does it work?
How does a magnetic drive pump work? Magnetically driven pumps are the industry standard when processing harsh and highly corrosive applications. So, how does a magnetic drive pump work? The centrifugal force driven by two rotating magnets rather than being directly...
What is Cavitation in centrifugal pumps?
What is pump cavitation? Definition Cavitation occurs in centrifugal pumps when the Nett Positive Suction Head Available (NPSHa) is lower than the Nett Positive Suction Head Required (NPSHr) causing the formation and accumulation of bubbles around the impeller eye...
Life Cycle Costs, What are they?
What are life cycle costs? Life Cycle Cost or LCC analysis is a management tool that can help companies minimize waste and maximize energy efficiency. This can be for many applications, not just pumping systems. To analyse Lifecycle Costs we break down all the...
Q & A – What is a centrifugal pump & how do they work?
Q - What is a centrifugal pump and how does it work? A - Centrifugal pumps have been relied upon as an industry workhorse since the 17th century and are the most commonly used type of pump for the transfer of liquids. A centrifugal pump operates through a...
Q & A – How much does a chemical pump cost?
Q - How much does a centrifugal chemical resistant pump cost? A- Unfortunately, the answer is as clear as how long a piece of string is. There are many varying factors including (but not limited to) the size of pump required for the flowrate and...
COVID-19 Update
Firstly, and most importantly, I hope you are well and keep as healthy as possible through this whole unprecedented episode. As of 27th March, our office team are all working remotely from home and our manufacturing team are still working hard to build and despatch...
ChemUK 2020 – Crest Pumps will be exhibiting Stand H33
We are pleased to announce that we shall again be exhibiting at the UK’s new chemical industry exhibition, ChemUK With some 2,500+ specialist businesses contributing to the UK’s chemical industry – embracing raw materials, chemicals, intermediates & consumables,...
The most important goal in our 47 year history?
With the terrible news of fires in Australia and flooding in Indonesia, the terrible impact of climate change is inescapable. As pumps are said to account for 10% of the world’s electricity consumption, our industry has a huge opportunity to help reduce the world’s...
Crest Pumps – Win a Christmas Hamper
Happy 1st week of December! To celebrate the festive period Crest are giving you the chance to win a festive hamper to enjoy over Christmas. If you place an order with us between 2nd - 16th December you will be put into a draw for a chance to win a big hamper. Winner...
Crest Pumps New Heavy-Duty Mag Drive Range
Crest is pleased to introduce the new AME range of heavy-duty magnetic drive process pumps. Constructed from a high purity PFA lining makes these pumps suitable for the most corrosive of applications even up to temperatures of 150degC. But two new design features are...
Top 5 Tips to Increase a Pumps Life
Top 5 Tips to increase a pumps life, whilst reducing your running costs and increasing profit margins. Material Compatibility Using the correct pump materials of construction are essential if the pump is to have a long life. This is especially so when handling...
ChemUK 2019 – Crest Pumps will be exhibiting Stand E15
We are pleased to announce that we shall be exhibiting at the UK’s new chemical industry exhibition, ChemUK 2019 With some 2,500+ specialist businesses contributing to the UK’s chemical industry – embracing raw materials, chemicals, intermediates & consumables,...
Pump Export Services
At Crest Pumps, our aim is to make working with us as simple as possible and that is just as true when it comes to exporting. In our 45 year history we have exported across the globe as far as New Zealand and even the Antarctic! Approximately 30% of our business is...
How to increase your efficiency with our UK built chemical pumps
When selecting larger pumps for capacities over 100m3/hr there are many factors to take into consideration to ensure that you have the most efficient option. With an anticipated life of several years it is obviously important to choose a pump that operates at, or very...
The Flexible Design of Vertical Pumps
Crest Pumps has the ability to supply specialist pumps at competitive prices on short lead times. This is particularly true of its range of vertical pumps which can be easily adapted to fit into customers’ installation constraints without compromising efficiency or...
My Pump Can’t Run Dry!
With over 40 years of experience in the pump industry we have seen a few instances where a pump has seemingly run dry but the customer has insisted this could never have happened. When a mechanically sealed or magnetic drive pump runs dry (i.e. with no liquid in the...
How does a Magnetic Drive Pump Work?
Magnetic drive pumps have been available for many years and are ideal for use with clean liquids, their obvious advantage in chemical applications is that they eliminate the need for potentially expensive mechanical seals. Magnetic drive refers to the coupling between...
What is The Difference Between Submersible and Immersible Pumps?
These terms can often be confused though the distinction is fairly obvious. Submersible pumps are complete units, including the motor, and the whole can be totally submerged whereas immersible pumps are mounted in vertical position with the motor above the liquid and...