Permanent Magnet Booster Pump

Due to their relative simplicity of design, centrifugal pumps are the most common pump type in the market. Centrifugal pumps are categorised into either single or multistage pumps, both of which have their uses. What is important to understand is where which should be selected, which ultimately comes down to their working principle and the application in question. So, let's understand the differences between the two…

The primary difference between single and multistage pumps is their impellers and how this affects operation. Whereas a single stage pump has only one impeller rotating around the shaft, multistage pumps have two or more. This characteristic has several implications for the performance of the pump, which we will go onto now.

The multiple impellers of a multistage centrifugal pump are all installed and rotated on the same shaft, and essentially act like separate pumps. This mean that as the flow progresses from one stage to the next, the head increases approximately by the same amount, resulting in the multistage pump design having much higher pressure capabilities than a single impeller is able to alone.
With the above in mind, multistage centrifugal pumps are often selected when the pressure requirements of the application exceed the capabilities of a single stage pump. For example, perhaps the fluid must be moved over a very large distance with considerable friction loss, which in most scenarios is achieved via multiple impellers. A typical example of this may be providing water supply to the top of tall buildings or towers. Single stage centrifugal pumps are on the other hand the better suited solution in higher flow, lower pressure installations.

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