What is a common symptom of pump cavitation?

A loud noise or vibration from the pump is indeed a common symptom of pump cavitation. Cavitation occurs when vapor bubbles form in a liquid due to localized low pressure, and then implode as they reach areas of higher pressure. This implosion creates shock waves, which can produce a characteristic noise often described as a rattling or grinding sound. Additionally, the vibration is a result of these rapid bubble formations and collapses, which can lead to mechanical stress and potential damage to the pump components over time.

While low fluid levels in the tank, frequent pump failures, and decreased pressure on the discharge line can be related to various operational issues, they do not specifically indicate cavitation. These symptoms could stem from other problems such as a malfunctioning pump, blockage in the system, or issues with the overall fluid management.