According to API recommendations, what is the required depth of cover for tanks located in traffic areas?

The correct depth of cover for underground storage tanks located in traffic areas, as recommended by the American Petroleum Institute (API), is indeed three feet. This depth is necessary to provide adequate protection for the tank against potential damage from traffic loads above.

Traffic areas are defined as locations where vehicles are expected to travel, which presents a risk of impact that underground tanks may be subjected to. The three-foot cover helps to dissipate the weight and pressure exerted by vehicles overhead, ensuring the structural integrity of the tank is maintained and mitigating the risk of leaks or ruptures that could lead to environmental contamination.

Additionally, this depth assists in preventing potential hazards related to soil movement and frost heave, which can also affect tanks at shallower depths. It is critical to adhere to these standards to ensure both safety and compliance with environmental regulations regarding underground storage tanks.