In this issue, a pump is working to transport water while its temperature is (20°C), The smallest possible pressure inside the pump is what we can anticipate without cavitation as following.
Cavitation is the phenomenon, which is a frequent reason for performance decline and even impeller blade erosion, when the pressure during liquid flow system drop below the vapor pressure at some places, and it resulted in unpredictable vaporization for the liquid, Cavitation bubbles collapse because the are move from the low-pressure regions, producing a high destructive pressure waves which damage the propeller.
Therefore, the flow pressure must be greater than the vapor pressure at the condition temperature in order to avoid cavitation.
At the given condition ( 20°C ) From TABLE (A-4):
Thus, the minimum pressure that can exist in the pump to avoid cavitation occurrence at any position on the pump surface should not be allowed to drop below
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