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How to choose between centrifugal pumps and positive displacement pumps?

5 years ago in Discussion By Fern G

Discussion

I’m unable to choose between centrifugal pumps and positive displacement pumps. Can someone tell me on what are the aspects that I should look into while choosing one among them?

All Answers (4 Answers In All)

By Arjun Patel Answered 5 years ago

Fern, choosing between a centrifugal pump and a positive displacement pump is not a straightforward task. Even I struggled with this process during my research period. The most important aspect that needs to be considered is flow rate & pressure head.

By Arjun Patel Answered 5 years ago

Yeah sure! Both the pumps behave differently regarding flow rate and pressure head: The centrifugal pump has varying flow depending on the pressure or head of the system. Whereas the positive displacement pump has a constant flow despite of the system pressure or head. So if you want constant flow then go for positive displacement pump.

By Jang Bahadur Singh Answered 5 years ago

Fern, not just flow rate, you will have to consider: 1.Capacity and Viscosity In a centrifugal pump the flow reduces when the viscosity increases In a positive displacement pump the flow increases when viscosity increases. Positive displacement pumps are suited for higher viscosity applications 2.Net Positive Suction Head In a centrifugal pump, (NPSH) net positive suction head varies as a function of flow determined by pressure In a positive displacement pump, net positive suction pump varies as a function of flow determined by speed.

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