With so many different types of pump available, it can be overwhelming to work out which type is best for your requirements. In this month’s ‘Which type of pump do I need?” we are looking at the different types of multistage pumps to help you understand what they are, how they work, and what they are used for.
An economical way of gaining high pressure on a centrifugal pump is to include multiple impellers within the pump casing, this is known as a multistage pump. Multistage pumps are used in installations where a high head is needed. Several stages are connected in series and the flow is guided from the outlet of one stage to the inlet of the next. The final head that a multistage pump can deliver is equal to the sum of pressure each of the stages can provide.
The advantage of multistage pumps is that they provide high head relative to the flow. Like the single-stage pump, the multistage pump is available in both a vertical and a horizontal version.
Vertical multistage centrifugal pump.
In vertical multistage centrifugal pumps, stages are stacked on top of each other in a vertical shaft. Vertical multistage centrifugal pumps have a smaller footprint than horizontal centrifugal pumps and they are more suitable for applications that have limited floor space. They are suitable for a wide range of applications including pumping liquids with high pressure and high temperatures.
However, vertical multistage centrifugal pumps require a large enough floor-to-ceiling distance and the height of the pump can make maintenance challenging. They can only be used with electric motors and not with drivers and when pumping liquids that contain high concentrations of dissolved gases it becomes difficult to handle and the mechanical seals are likely to fail.
Typical applications of the horizontal multistage centrifugal pump include high-pressure shower systems, boiler feedwater and desuperheater feed.
Horizontal multistage centrifugal pump.
Horizontal multistage centrifugal pumps have a shaft that is placed horizontally. They are easier to install than vertical centrifugal pumps and maintenance is easier because the internal parts are easy to access. The overhang shaft design can be used for applications that require low suction pressure and in-bearing shaft designs can be used for applications that require high suction pressure. They are highly suitable for indoor applications as the pump has low headroom, meaning it can comfortably fit in cramped spaces.
Typical applications of the horizontal multistage centrifugal pump include mine dewatering, condensate, high-pressure cleaning, pressure boosting, boiler feed, and reverse osmosis.
You may need advice and support, installation, repair or maintenance, and this is where our one-stop-shop approach pays dividends. Before selecting a multistage pump, feel free to give us a call to ensure you’re choosing the right fit for your application.
If you’re looking for a multistage pump, talk to us and we will make sure you select and purchase the product that best fits your purpose. Our team has extensive knowledge and experience and you’ll find us friendly and approachable. Call us on 01604 648 800, email firstname.lastname@example.org or fill in our online enquiry form.