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This 3D animated video shows how a multistage centrifugal pump works. We look at some of the main components, how it works and some different multistage pump designs.

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▶️Introduction
Multistage centrifugal pumps are used to increase the pressure of a pumped fluid without reducing the flow. This type of pump often utilises multiple diffuser casings, but can also use multiple volute casings (less common).

Operation
The pumped fluid is drawn into the impeller eye of the first stage impeller, it is then discharged and fed to the next impeller eye, and the process is repeated until the fluid has passed through all impellers. Each impeller is referred to as a ‘stage’. A five stage pump is a pump with five impellers.

For a more in depth look at pump operation, watch our How a Centrifugal Pump works video:

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Components
The centrifugal pump consists of:

Wear rings
Compression packing or a mechanical seal
Impeller
Volute casing or diffuser
Lantern ring (for compression packing only)

For a more in depth look at pump parts and components, watch our Centrifugal Pump Components video:

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Centrifugal pump Designs and Classifications

Centrifugal pumps are classified based upon the impeller used, or flow type.

Impeller types are fully enclosed, semi-closed (or partially open) and open.

Flow types are radial, axial and mixed.

For a more in depth look at radial centrifugal pump impellers, watch our Centrifugal Pump Impellers video:

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