How to prevent pump cavitation

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Eliminate pump cavitation | Plant Engineering
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Cavitation is a problem in pump operation.

When cavitation occurs, the pump is subjected to large shock vibrations, which can cause damage to the pump.

There are some aspects that can be changed depending on the operating conditions and piping conditions, but there are also measures that can be taken on the pump itself.


If you want to quickly solve the cavitation problem, a diffuser is a good choice.

Specifying a diffuser when selecting a pump will solve the problem.

Diffusers are attached to the suction port of a pump and provide hydrodynamic and physical protection to air bubbles before they reach the pump impeller.

The scary thing about cavitation is that air bubbles form in the fluid, and when they reach the impeller, they contract and expand.

Cavitation problems occur the moment air bubbles form in the piping, but it is a much bigger problem inside the pump.

The idea behind attaching a diffuser is to prevent this.

Please note that some pumps cannot be fitted with a diffuser.

Size up

One solution is to increase the size of the pump, which is the suction nozzle diameter where cavitation is likely to occur.

The suction port is designed by the pump manufacturer, so whether the nozzle size can be increased to meet the required flow rate depends on the manufacturer.

There is a possibility that they may not be able to accommodate this, so this is not a guaranteed method.

If the pump capacity increases as a result of increasing the size, the piping diameter may be insufficient, and cavitation may accelerate.

Inverter Control

Reducing the rotation speed with an inverter helps prevent cavitation.

Attaching an inverter to a pump is itself a rare practice, and it is expensive and takes time to deliver.

Installing an inverter just to prevent cavitation should be stopped.

It is more practical to throttle the valve to reduce the flow rate.