Thus, we see that NPSH-r as per Hydraulic Institute’s definition of 3% head drop is not
an indicator of inception of cavitation and consequent pump damage.
It then becomes necessary to come up with a theoretical NPSH-r that can indicate the
inception of cavitation that can then ensure a cavitation-free operation.
The theoretical derivation of NPSH-r or ‘Cavitation-Free NPSH’ is based on factors
such as:
• Head loss due to f
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