Multistage centrifugal pumps have multiple impellers and volutes (stages) that connect in a series, allowing the liquid to flow from one stage to the next at increased pressure. The liquid enters the first volute or chamber at suction line pressure and exits at elevated pressure. The fluid then enters the second stage where the pressure increases and continues through each chamber until discharge. Each stage that the liquid passes through increases the pressure until discharge, at the highest pressure.
A multistage pump develops pressure according to the diameter of the impellers, the number of stages or volutes and the speed of the impellers. As there are several impellers to transfer energy into the pumped liquid, each impeller and volute combination can have smaller gaps. While smaller combinations ensure hydraulic efficiencies, multistage pumps are not well suited for pumping solid or abrasive materials.
Applications for multistage pumps
What makes multistage pumps unique is that they can produce higher pressure at each stage yet retain a constant flow. They’re also one of the more energy-efficient pumps for many different applications.
Multistage pumps are popular in pressure-boosting applications (for example, to push water up to high rise buildings), reverse osmosis (RO), boiler feed water, spraying and high-pressure cleaning, waterworks and water circulation, irrigation, heating and cooling/conditioning, wash down facilities, oil & gas production and power generation & mining.
Depending on how the shaft is positioned and shaped, multistage centrifugal pumps can be either vertical or horizontal.
Horizontal Multistage Centrifugal Pumps
This type of pump has modular components with a rotating assembly located between bearing housings. The shaft of horizontal centrifugal pumps is horizontal, which makes these pumps particularly suited to indoor applications where they require less headroom.
A horizontal centrifugal multistage pump is balanced at high pressures, which means it can handle higher flow rates than vertical multistage pumps. However, horizontal stage pumps require somewhat more complicated mounting due to expansion/contraction issues. They can also be expensive upfront and difficult to maintain.
Vertical Multistage Centrifugal Pumps
A vertical multistage pump has a shaft that runs vertically, with stages stacked on top of each other. Above ground, they are well suited to applications with space limitations or less ground surface, or where you need to increase NPSH. They work well for both high-pressure output and higher temperature fluids but have minimal clearances which makes them suited for clean water applications.
This type of pump can’t handle large debris or solids and might be at risk of deadhead. In some applications, the motor must be removed to perform maintenance.
Whether vertical or horizontal, multistage centrifugal pumps are an energy-efficient solution for a wide range of flow/head scenarios. If you think it might be right for your application, be sure to call our toll-free number 1-800-367-. Our experts are on hand to help you choose, install and maintain a variety of equipment. And to answer questions about things you’ve previously tried gone wrong.
If you are looking for more details, kindly visit Shuanglian.
A multistage pump emerges as a reliable and versatile solution across numerous industrial and commercial applications requiring high-pressure fluid transportation. Boasting enhanced efficiency and robustness, these pumps find their ideal utility in scenarios where a single-stage pump may fall short. The key advantage of employing multistage pumps lies in their ability to generate significantly higher pressures by pumping the fluid through multiple stages. This approach results in each stage increasing the overall pressure.
Multistage pumps come into play in scenarios such as water supply for high-rise buildings, oil and gas processing, water treatment plants, irrigation systems, and desalination processes. Additionally, their proficiency in dealing with boiler feedwater challenges in power plants underscores their importance in the energy sector. The modular design of these pumps also enables seamless customization, facilitating a perfect match for specific project requirements. Moreover, with advancements in technology, multistage pumps have seen improvements in energy efficiency and maintenance ease, further solidifying their position as a cost-effective and eco-friendly choice.
A multistage pump operates by utilizing multiple impellers arranged in series within the pump casing. Each impeller is responsible for increasing the pressure of the fluid as it passes through. As the fluid enters the pump, it is drawn into the first impeller, where it gains some pressure. The partially pressurized fluid then moves to the next impeller, and the process is repeated through all the impellers, each one contributing to a gradual increase in pressure.
Vertical Multistage Centrifugal Pump: This type of multistage pump consists of several impellers stacked in a vertical arrangement with the motor mounted above the pump. Vertical multistage pumps are commonly used in water supply systems, building services, irrigation, and industrial applications where high pressures are required in a compact design and are particularly suited for installations where space is limited.
Horizontal Multistage Centrifugal Pump: Similar to their vertical counterpart, the horizontal multistage pump comprises multiple impellers, but they are arranged in a horizontal configuration. Large horizontal multistage pumps can exceed the pressures and flow rates of their vertical counterparts and may find use in industrial processes, boiler feedwater systems, pressure boosting, and water circulation in cooling towers.
Borehole Multistage Pump: Borehole multistage pumps are specifically engineered for extracting water from deep boreholes or wells. The multistage configuration of these pumps enables them to lift water from considerable depths to the surface. Borehole pumps are commonly used in domestic, agricultural, and industrial settings, where access to groundwater is essential for various applications such as irrigation, livestock watering, and residential water supply.
A multistage pump is comprised of several key components that work together to facilitate the efficient transportation of fluids at high pressures. The main components of a multistage pump include:
Impellers: Multiple impellers, also known as stages, are mounted on a common shaft inside the pump casing. Each impeller increases the pressure as the fluid moves through the pump.
Diffusers or Guide Vanes: Positioned between the impellers, diffusers or guide vanes direct the fluid flow from one stage to the next, optimizing the energy transfer and pressure buildup in each stage.
Suction and Discharge Ports: These are the entry and exit points for the fluid into and out of the pump. The suction port draws fluid into the pump, while the discharge port releases the pressurized fluid to the system or application.