If an operator hears a pinging sound coming from the pump, what is the probable cause?

The presence of a pinging sound coming from the pump is often indicative of cavitation. Cavitation occurs when the pressure in a pump drops below the vapor pressure of the liquid being pumped. This leads to the formation of vapor bubbles within the liquid. As these bubbles travel through the pump and enter areas of higher pressure, they collapse or implode, creating shock waves that result in the distinct pinging or knocking sound.

This phenomenon can cause significant damage to the pump components over time, including erosion and reduced efficiency, making it crucial for operators to identify and address the situation promptly. Factors that can contribute to cavitation include insufficient inlet pressure, excessive flow rates, or improper pump design, all of which should be evaluated if cavitation is suspected.