What requirement exists for aboveground containers?

Aboveground containers are typically required to be painted. This practice is important for a couple of key reasons. First, painting the containers can help protect them from corrosion and oxidation, which can occur when they are exposed to the elements. A good quality paint acts as a protective barrier against moisture, ultraviolet (UV) rays, and other environmental factors that could potentially compromise the integrity of the container.

Furthermore, the color of the paint can be specifically chosen to reflect sunlight, which aids in maintaining a more stable temperature inside the container, minimizing pressure fluctuations due to heat expansion. This is particularly relevant in regions with extreme temperature variations.

While the other options suggest conditions that do not align with safety and regulatory standards for propane containers, painting serves multiple protective purposes, making it an essential requirement for aboveground installations.