If a centrifugal pump has been running quietly and then suddenly develops cavitation, what does this usually indicate?

Cavitation in a centrifugal pump is a problem that occurs when there are changes in pressure within the pump that lead to the formation of vapor bubbles. When the pump has been operating quietly and then suddenly experiences cavitation, it often signals an issue with the conditions on the suction side of the pump.

The presence of an obstruction in the suction line can restrict the flow of liquid into the pump. This can cause a drop in pressure, leading to the flow conditions necessary for cavitation to occur. The pump then struggles to draw enough fluid, causing the pressure to fall below the vapor pressure of the liquid, which results in the formation of vapor bubbles.

Understanding the dynamics of fluid flow into the pump and the resultant pressure changes is essential for diagnosing cavitation. Identifying an obstruction—whether it is due to blockages, closed valves, or issues with piping—can help in addressing and resolving cavitation problems effectively.