Multi-Stage Pump Casings & Impellers

How do Multi-Stage Pumps utilize Casings and Impellers?

Multi-Stage Pumps have two or more impellers rotating around the shaft at one time. This essentially allows the multiple impellers to act like separate pumps. This means as the flow progresses from one stage to the next, the first impeller increases by the same amount as the last impeller, resulting in a multi-stage pump design with more pressure capabilities than a single impeller is able to do alone.

In a Multi-Stage pump each impeller can be smaller in diameter and can operate with tighter clearances between the impeller and volute. These smaller tolerances mean each impeller can operate closely to its best hydraulic efficiency, allowing them to collectively achieve higher performance with a smaller motor size and less energy.

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Application & Industries

Multi-Stage Pumps (MSP) are used in environments that have high pressure requirements and when the application exceeds the capabilities of a single stage pump. A multi-stage pump generates extra flow by routing the discharge of one impeller to the suction of another.

The majority of MSP tend to utilize closed impellers, however semi-open and open type can also be utilized. These impellers are also utilized in pumps serving a wide range of applications for multiple industries:

• High-pressure cleaning
• Reverse osmosis
• Irrigation
• Oil & Gas
• Mining
• Firefighting

Case Studies, News, & Resources

• SF&E Improves Castability and Production Timeline for Complex Impeller
• SF&E Pours Largest Nuclear Impeller in its History
• For Fristam Pumps, Mutual Trust is Key to 20-Year SF&E Partnership
• Oil Refinery Partners with Turbonetics and SF&E on Illium PD Double Suction Casing 
• Core Parts: Anatomy of a Centrifugal Pump
• Pump Impellers
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