What must be installed at the tank when coated copper tubing is used underground?

When coated copper tubing is used underground for fuel systems, it is essential to install an Overfill Protection Valve (OSV) or a Pressure Relief Valve (PRV) at the tank. This requirement ensures that if there is an overpressure condition due to thermal expansion of the fuel or other factors, the valve will function to relieve that pressure, preventing leaks or potential ruptures in the system.

The OSV or PRV plays a crucial role in maintaining safety and compliance with the Maine Fuel Code. It helps in protecting both the tank and the surrounding environment from potential hazards associated with fuel spills or releases.

Understanding the specific function of OSV and PRV valves helps reinforce the importance of preventive measures in fuel system installations, particularly in scenarios where underground tanks are involved. These valves are designed to maintain the integrity and safety of the fuel storage system, ensuring that it operates within safe pressure limits.