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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

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...
Mechanical Seal Selection

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 – 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...
What is Cavitation in centrifugal pumps?

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...
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