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Multistage centrifugal pumps have been one of the most popular types of pumps in recent years. Their ability to provide engineers with a flexible range of flow and head, along with their high degree of energy efficiency makes them a great choice for many applications. Could they be right for yours?
Multistage centrifugal pumps have multiple liquid chambers (or stages) that are connected in series. Fluid enters the first chamber at suction line pressure and leaves at some elevated pressure. Upon leaving the first stage, the fluid enters the second stage where the pressure is increased further.
The more stages the pump has, the higher the final discharge pressure. These pumps have the unique ability to produce higher and higher pressures with the addition of every stage, but flow range always remains constant for a given rpm.
There are a couple different types of multistage pumps. Those with a horizontal shaft, and those with a vertical shaft.
This type of pump has a segmented casing with modular interstage components. The rotating assembly is held between bearing housings, making the assembly more balanced for high pressures.
They typically handle higher flow rates than vertical multistage pumps (with the exception of vertical turbine pumps).
The horizontal configuration of multistage pumps is best applied in applications like these:
This type of pump is pretty maintenance intensive, however. It takes a high skill set to work on these pumps and ensure they are put back together properly. They can also be quite costly upfront, depending on the degree of specification required and the materials of construction.
Vertical multistage centrifugal pumps have a vertical shaft, where stages are stacked one on top of the next. (Disclaimer: Although vertical turbines are technically multistage pumps, these are not the types of pumps we're discussing here. )
Clearances are small in these pumps, therefore, clean water applications are best for this pump:
Vertical multistage pumps are great for areas that don't have much footprint to spare. Its ability to deliver high pressure output with a single pump body and motor combo is also a plus.
It is important to keep in mind, however, that this type of pump does not tolerate debris or significant solids, and is also vulnerable to deadhead conditions.
Multistage pumps provide many key benefits, from energy savings, to ability to operate in a wide range of flow/head scenarios. If you think it might be right for your application, be sure to discuss with a qualified engineer first. They'll make sure the right pump is selected specifically for your purpose.
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