What does overfill protection do?

Overfill protection systems are vital for maintaining safety and regulatory compliance in the operation of underground storage tanks (USTs). The primary function of these systems is to prevent the tank from becoming overfilled during fuel delivery. This is accomplished by ensuring that the flow of fuel is automatically stopped before the tank reaches its full capacity, thereby significantly reducing the risk of spills and leaks that can occur if overfilling were to happen.

These systems employ various technologies, such as float mechanisms or electronic monitors, which detect the tank's level and halt fuel delivery when the tank approaches its maximum capacity. This proactive measure helps protect the environment and promotes safety at fueling stations, as any overflow can lead to serious environmental consequences, including soil and groundwater contamination.

The necessity of such systems aligns with numerous regulatory guidelines which mandate adequate overfill protection as a part of compliant UST operation. While alerts to personnel and accurate measurement of tank capacity are also important, they do not directly stop the delivery flow, which is the critical function provided by overfill protection.