Which risk increases when a hydraulic pump intake has insufficient Net Positive Suction Head Available (NPSHa)?

💡 Explanation

Increased erosion occurs due to cavitation. As NPSHa decreases the local pressure at the impeller inlet falls therefore liquid vaporizes forming bubbles. The implosion of these bubbles causes pitting of the impeller because of the 'Vapor-Pressure-Reduction cavitation' mechanism rather than affecting overall fluid properties.

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