Which outcome is caused by exceeding the Net Positive Suction Head Required (NPSHr) in a submerged-volute pump?

💡 Explanation

When the Net Positive Suction Head Available (NPSHa) is less than the NPSHr, cavitation occurs because the pressure drop is too large relative to the vapor pressure causing bubbles to form and collapse at the impeller eye leading to erosion. Therefore, pump failure occurs, rather than vibration, overheating, or seal wear which involve different mechanisms and failure conditions.

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