What is the significance of using pressure-relief devices in UST installations?

The significance of using pressure-relief devices in UST installations primarily lies in their role in preventing over-pressurization. These devices are essential safety features that help maintain pressure within a storage tank at safe levels. When fuel is heated or when atmospheric conditions change, pressure inside the tank can increase. If not adequately managed, this excess pressure can lead to tank failure, leaks, or ruptures, posing significant safety and environmental risks.

By automatically venting excess pressure, pressure-relief devices ensure the integrity of the tank and its containment systems. This not only protects the tank itself but also helps prevent potential spills or releases of hazardous substances, thereby contributing to overall environmental protection. Additionally, maintaining appropriate pressure levels aids in ensuring that the tank system functions as designed, supporting both safety and operational efficiency.

In summary, the correct answer highlights the critical function of pressure-relief devices in managing tank pressure, which is vital for safety and environmental compliance in underground storage tank installations.