When coaxial Stage I Vapor recovery is used, vent restriction devices will not function as which type of measures?

When coaxial Stage I Vapor recovery is implemented, vent restriction devices are designed to control the flow of vapors during the fuel dispensing process and ensure that these vapors do not escape into the environment. However, they do not function as overfill-prevention measures.

Overfill-prevention systems are specifically designed to prevent the tank from being filled beyond its capacity during fuel delivery. They typically involve mechanisms that activate alarms or shut off valves to stop the flow of fuel once a certain level is reached. Vent restriction devices, while important for maintaining vapor recovery compliance and system pressure, do not provide a direct method for monitoring or managing the level of fuel in the tank during delivery.

This distinction is crucial for compliance with safety regulations and operational efficiency, highlighting the specific roles that different components play in UST systems. As a result, understanding the specific functions of vent restriction devices versus dedicated overfill-prevention systems is essential for anyone working with UST installations or retrofitting processes.