Knowledge sharing on “All about Centrifugal Pumps” for Engineering students/young Engineers/professionals of oil & gas industry. Series -4

1. Relationship between a critical speed of a pump shaft rotor          and its operating speed.

Generally, the pump shaft rotor dimensions of a single stage pump cause the first critical speed to be considerable above its operating      speed. However, centrifugal pumps may operate above their first        critical speed without danger if the speed is high enough. This is        done by OEM, in multistage pumps by designing their shafts so          that the first critical speed is from 60 to 75% of the operating              speed.

 

2. What is meant by rigid and flexible shafts?

A rigid shaft has a first critical speed higher than its operating speed.

 A flexible shaft has its operating speed higher than one of its critical speeds

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