A multistage pump is a centrifugal pump with more than one impeller in series. So the real choice is single stage or multistage, and it depends on how much head you need at your flow.
How staging adds head
Each impeller adds roughly the same head. Stack four impellers and you get about four times the head of one, at the same flow. A single stage pump has to reach that head with a larger impeller or a higher speed, which usually costs efficiency.
When a single stage pump makes sense
- High flow at low to medium head, such as transfer and circulation
- Liquids with suspended solids that would wear the tight clearances of a multistage pump
- Duties where simple maintenance matters more than peak efficiency
When to choose multistage
- Boiler feed and pressure boosting
- RO feed and water supply to tall buildings
- Clean water at high head and moderate flow
Vertical or horizontal multistage
Vertical multistage pumps take little floor space and suit clean water boosting and RO feed. Horizontal multistage pumps handle higher flows and are easier to open up on site, which helps on boiler feed and process duty.
Rule of thumb
Check NPSH available before you select. Multistage pumps on suction lift or hot water often fail from cavitation, not from wear.
Conclusion
Share flow, total head, liquid and temperature with our team. We will suggest single stage or multistage and show you where the pump will run on its curve.
