True or False: Temperature changes can lead to over-pressurization.

The statement that temperature changes can lead to over-pressurization is true because when the temperature of a liquid or gas within a closed system increases, its pressure also typically increases. This principle is based on the ideal gas law and thermodynamic behavior, where heating a confined substance causes its molecules to move more rapidly, thus exerting more pressure on the walls of the container.

In the context of underground storage tanks (USTs), for example, if the temperature of the stored liquid increases due to environmental conditions or internal reactions, the vapor pressure above the liquid can rise significantly. If this pressure surpasses the design limits of the tank or its fittings, it can lead to over-pressurization, posing risks such as leaks, ruptures, or system failures.

Understanding this relationship is crucial for those involved in the installation and retrofitting of USTs, as they must consider temperature fluctuations and their potential impact on system pressure to ensure safety and compliance with regulations.