Frequent on and off cycling of a pump on a hydropneumatic tank would indicate what issue?

The frequent on and off cycling of a pump in a hydropneumatic tank typically indicates that the tank is waterlogged due to a lack of air. In systems like these, a hydropneumatic tank operates by using a cushion of air to maintain pressure in the water distribution system. If the air in the tank is depleted or if the tank has become waterlogged, there’s not enough air to maintain the required pressure. This can cause the pump to cycle rapidly as it struggles to keep up with the demand and maintain the pressure needed for proper operation.

In a waterlogged tank, the pump will turn on to try to fill the tank to the set point but will quickly reach the limit of water without the necessary air cushion, prompting it to turn off. The rapid cycling is indicative of this imbalance where the pump is effectively operating in a state of excess demand with insufficient air pressure to support the system.

For clarity, such a condition can lead to increased wear on the pump and can affect the overall efficiency of the water distribution system. Keeping the air charge at the appropriate level is crucial to prevent these issues from arising.