CHAPTER 6
VELOCIS SOLUTIONS @2018
3
curve as net head. These curves are defined using”water“ as a fluid by manufacturer during
determination of performance curves.
In a centrifugal pump NPSH is mainly governed by rotational speed(N), eye of an impeller, type and
number of vane. However, with reciprocating pump it is a function of speed and valve design.
Figure 7.2: Cavitation occurred on impeller blade
Figure 7.3: NPSH plot on performance curve
The volume flow rate at which the actual NPSH and the required NPSH intersect represents the
maximum flow rate that can be delivered by the pump without the occurrence of cavitation.
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