When would the most damage occur to a centrifugal pump with a leaking check valve?

The most damage to a centrifugal pump with a leaking check valve is likely to occur on startup of the pump. This is primarily due to the hydraulic conditions that exist during the initial phase of pump operation. When the pump starts, it requires the movement of fluid to create suction and maintain pressure. If the check valve is leaking, it will allow the backflow of fluid, potentially causing cavitation or a significant drop in the pressure required for optimal operation.

During startup, the pump is not yet at its operational capacity, which means that if air or other fluids are introduced into the system due to the leak in the check valve, it can lead to inconsistent flow, loss of prime, or damage from cavitation. Cavitation occurs when vapor bubbles form in low-pressure areas within the pump and can collapse violently, leading to physical damage to the impeller and other internal components.

This scenario highlights the critical need for check valves to function properly to ensure that the pump can maintain a consistent flow upon startup. Maintaining the integrity of the check valve is essential to protect the pump from unnecessary wear and damage, particularly during this vulnerable phase of operation.