Centrifugal pumps are kinetic pumps which, thanks to the action of centrifugal forces, allow the liquid to first increase its kinetic energy and then transform it into pressure energy. Centrifugal pumps can be used in a wide range of industrial applications, offering high operational efficiency in terms of versatility and performance. The main types of centrifugal pumps include two configurations:
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The aim of this article is to clarify the main differences between the two types of centrifugal pumps while highlighting the most appropriate uses and related benefits.
Horizontal centrifugal pumps are one of the most widely used pump models within industrial applications. The design configuration involves aligning the pump head on the same plane with the pump motor. The positioning of the motor and pump head can be either close coupled (without couplings) or long coupled (with a coupling). The main areas of use include spraying systems (e.g., in the automotive or paint industry) and water purification systems for circulating very dirty liquids with suspended solids.
Horizontal centrifugal pumps are easier to install and maintain because their design configuration makes them more accessible to the operator. Horizontal pumps can be easily adapted to different suction requirements and are particularly suitable for placement within plants where space is restricted.
This type of pump has a vertical alignment in which the motor is positioned above the pump shaft. Also in this case the coupling between motor and pump head can be close or long where a spacer bracket acts as a support for the motor. The most frequent applications concern fluid transfer systems even with solid parts in suspension, lifting stations or fixed installations where the pump is immersed directly inside a tank.
Vertical centrifugal pumps are designed to lift fluid from an area of high depth. Compared to horizontal models, vertical pumps occupy a smaller footprint and are therefore an excellent solution for installations where the available floor space is limited. Vertical pumps are very well suited to pumping high-pressure fluids even at high temperatures. Vertical pumps use an electric motor, which in some cases may limit their uses.
Choosing the right pumping technology depends on a very high number of factors. At DEBEM we have a technical sales team that can provide support on the choice of the best pumping technology, be it horizontal or vertical. Do not make a choice if you do not have the right information. We will help you find exactly the right solution.
When choosing the right centrifugal or booster pump for a new system, there are factors that should be considered. Flow rates, piping configurations and dimensions are commonly considered. But what about the pump configuration? Should a horizontal or vertical pump be selected?
When selecting a pump, the footprint should be examined. A horizontal pump will occupy floor space which could be critical in a water treatment system. A vertical pump takes up less floor space but requires vertical headroom as well.
Typically, end suction centrifugal pumps need to be mounted horizontally. While the Webtrol EZ Series is a multistage horizontal pump, it can be mounted vertically on a wall or rack to suit a specific application. The Webtrol NV Series is a vertical pump which uses very little floor space.
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Priming and start up should also be investigated when selecting the pump. Horizontal pumps are easily primed. Vertical pumps, however, may be harder to prime initially since air can get trapped in the upper portion of the impeller stack. Additional bleeding the air and cycling are sometimes needed. Once the system is operational, priming should not be an issue unless air is drawn into the system by lack of water.
Net Positive Suction Head (NPSH) should also be weighed when choosing the pump configuration. If the NPSHa (Net Positive Suction Head available) is sufficient to avoid cavitation, both configurations will work. If NPSHa is marginal due to a negative elevation of the fluid in relation to the pump, a foot valve to hold the pump full of water will be needed or additional priming equipment may be necessary. In some cases, a self-priming centrifugal might be an option to ensure that the prime is not lost.
Finally, performance near best efficiency is always a consideration. In selecting a pump that runs nearest to the best efficiency point, you are choosing the manufacturer's selected performance in both operation and energy savings. This adds up to life cycle cost of the pump being held to a minimum.
You can find Webtrol NV Series Pump dimensions and EZ Series Pump dimensions on this site, and 3-D drawings are available upon request through sales or customer service.
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