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What is a multistage centrifugal pump?

We recently looked at how centrifugal pumps work, but today we’re expanding on the theme by asking “what is a multistage centrifugal pump?” Read on as we explain all…


If a pump user requires a differential pressure of over 150 PSI between the suction and the discharge, a single-impeller system can be costly and difficulty to implement. Therefore, a more economical alternative is required. That’s where the multistage pump comes in.

What is PSID?

PSID stands for pounds force per square inch differential, meaning the pressure difference between the suction and discharge of a pump.

Multistage centrifugal pump

An efficient solution for developing high pressures in a single centrifugal pump is to have multiple impellers on one shaft within the same casing. When liquid is discharged from one impeller it is fed to the suction of the next one and so on depending on the number of stages. Each stage is the section of the pump consisting of an impeller and its components, such as the volute.

What is a volute?

In centrifugal pumps, a volute is a curved passage that receives the fluid being pumped by the impeller, slows its flow and discharges it.

What are multistage pumps used for?

Due to the tight clearance between impeller and volute, multistage pumps tend to be employed for moving clear, clean, liquids that require a significant amount of discharge pressure. For the same reason, it isn’t advisable to use them for moving liquids containing solids, abrasives, or stringy material.

If you’d like to discuss having multistage pumps installed for your application, give Matthew Gibbons a call on 07970676272 or email

Pumps & Controls

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