Quick Answer
If a pressure tank is over-pressurized, it can lead to a sudden release of stored water, potentially causing property damage, injuries, or even fatalities. The over-pressurization can also damage the tank, pipes, and other connected equipment.
Causes of Over-Pressurization
Over-pressurization of a pressure tank can occur when the tank is undersized for the system’s demand, or when the pump is oversized for the tank’s capacity. This mismatch can cause the tank to fill too quickly, leading to excessive pressure buildup. A general rule of thumb is to size the tank for at least 2-3 gallons of water per square foot of diaphragm surface area. For example, a 60-gallon tank with a 10-square-foot diaphragm should be sized for at least 120-180 gallons of water storage.
Consequences of Over-Pressurization
When an over-pressurized tank eventually ruptures, it can release a large amount of stored water at high velocity, potentially causing damage to surrounding structures, piping, and equipment. The force of the water release can also cause injuries or fatalities to people in the immediate area. To mitigate this risk, over-pressurization protection devices such as pressure relief valves or rupture disks can be installed on the tank.
Prevention and Protection
To prevent over-pressurization, it’s essential to properly size the pressure tank and matching pump for the system’s demand. Regular inspections and maintenance of the tank and connected equipment can also help identify potential issues before they become major problems. Additionally, installing an over-pressurization protection device on the tank can provide an extra layer of safety and protection against catastrophic failure.
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