What Is Cavitation

What is Pump Cavitation?

Pump cavitation is a damaging condition that can affect any fluid flow system. It’s caused by excessively low pressure at the pump inlet.

As part of normal operation, pressure is reduced in the pump inlet as water speeds up on its way into the eye of the impeller. If the flow of water is restricted or blocked, perhaps by a clogged filter or a partly closed valve, the pressure falls enough such that tiny bubbles of water vapor form.

As the impeller rotates, an area of higher pressure forms on the leading edge of the impeller vanes. In this area of higher pressure, the bubbles collapse back into liquid form, releasing latent energy in a small jet of pressure that can damage a metal surface.

Left unaddressed, cavitation can cause extensive damage to system components, but of course, the damage to a pump is often most obvious in the impeller.

A cavitating pump makes a unique noise that sounds like gravel or coffee beans in the piping. But hearing cavitation may involve standing very near the pump. To help operators with diagnosing cavitation remotely, Armstrong offers Pump Manager, a cloud-based subscription service that uses performance indicators to provide notifications, alerts and alarms regarding pump operation. Contact your local Armstrong representative for details on Design Envelope pumps and our Pump Manager service.

If you suspect a pump in your facility is cavitating, contact Armstrong for assistance. We can connect you with a service professional in your territory.

Find out more about pump cavitation:

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Thank you for giving such crystal clear perception on Cavitation.

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