How to select the rotational speed of a centrifugal pump impeller?
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Because at the work site, I saw centrifugal pumps whose flow rate and head difference wasn’t that large, but whose impellers and rotational speeds differed considerably. So, given that the circumstances are more or less similar, why do some pumps choose a large impeller at low speed rather than a small impeller at high speed? Is it the same in reverse?
Specifically, depending on the medium being transported, if the medium contains solid particles, a lower rotation speed is generally chosen to reduce wear on the rotating components. High-speed pumps can be used for clear liquid media. However, although low-speed pumps have high procurement costs, those with the same performance offer advantages such as lower noise and a longer lifespan for their wear parts.
Under normal circumstances, a speed of 3000 revolutions per minute yields higher efficiency than one of 1500 revolutions per minute; if the medium is clean and the conditions at the inlet are favorable, a higher rotation speed should be preferred~~~~
4-stage pumps have superior cavitation performance compared to 2-stage pumps