What is pump cavitation?

As a supplier of our own high-performance pumps, along with a wide range of T-T Pumps and Lowara models, we’re well aware of some of the issues that can occur. A common pump problem is cavitation, and it’s a condition that can cause long-term damage. Here we’ll look at the cause of cavitation and what can be done about it.

What is cavitation?

Cavitation occurs commonly in centrifugal pumps and is a process in which bubbles or voids form in a liquid, normally as a result of rapid pressure changes. When the blades of the pump’s impeller move through the liquid, low-pressure areas form, with the pressure becoming lower as the impeller accelerates. The fluid then vaporises and forms small bubbles, which is what we call cavitation.

What are the effects of pump cavitation?

As the bubbles collapse in a higher-pressure area of the pump, they cause shock waves. These can be very noisy, causing a rumbling or cracking sound, as if there are stones rattling within the pump casing. The shock waves are also strong enough to damage the impeller surface, and as the flow pattern of the liquid is distorted, efficiency is reduced.

How can cavitation be avoided?

There are several measures that can be taken to reduce or eliminate cavitation, including:

• Lower the temperature
• If possible, reduce the motor’s rpm
• Increase the diameter of the impeller eye
• Use a double suction impeller.

Alternatively, bring your pump to our workshop where our experienced team of expert engineers can diagnose and correct cavitation problems to leave you with an efficient, smooth-running machine.

So whether you’re looking for pump repairs, servicing or sales, call Matthew Gibbons on 07970676272 or email matthew.gibbons@gibbonsgroup.co.uk for a fast, friendly service.