What is the most likely cause of a pump cavitating, indicated by a loud pinging sound?

Cavitation in a pump commonly occurs when there are insufficient suction conditions, causing vapor bubbles to form in the liquid being pumped. These bubbles can collapse violently, leading to the loud pinging sound characteristic of cavitation. A partially closed intake can restrict the flow of liquid into the pump, lowering the pressure at the pump inlet and creating conditions conducive to cavitation.

When the intake is not fully open, it decreases the available fluid flow, which can lead to a reduction in pressure in the pump’s suction line. As a result, the pressure can drop below the liquid’s vapor pressure, leading to the formation of vapor bubbles. When these bubbles implode as they travel through the pump, they can cause both noise and potential damage to the pump components over time.

Understanding pump operation and the significance of intake conditions helps in recognizing cavitation symptoms and implementing corrective measures.