The effects of vapor pressure on pump performance

When cavitation occurs in a pump, its efficiency is reduced. It ean akso cause sudden surges in flow and pressure at the discharge nozzle. The calculation of the NPSITr (the pump s minimum required energy) and the NPSITa (the system s available energy), is based on an understanding of the lic]uid s absolute vapor pressure. 

The effects of cavitation are noise and vibration. If the pump operates under cavitating conditions for enough time, the following can occur  

The focus should be on rc.solving cavitation problems by increasing the external pre.ssurc on the fluid or dccrea.sing its vapor pressure. The external pressure could be increa.sed by  

At times, simply removing aspirated air venting the pump will have the same effect. 

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