Are above-ground storage tanks pressurized or nonpressurized?

Above-ground storage tanks can indeed be either pressurized or nonpressurized, which is why the correct answer encompasses both options.

Pressurized above-ground storage tanks are designed to operate under pressure, allowing them to store chemicals or fuels in a manner that can prevent vapor loss and enhance safety by reducing the risk of leakage or combustion. These tanks are often equipped with safety features to handle the pressure and maintain the integrity of the contents.

On the other hand, nonpressurized tanks are designed to operate at atmospheric pressure. They are typically used for storing liquids that do not require pressure for stability, such as water or certain non-volatile substances. These tanks are built to withstand the weight of the liquid and environmental factors without the additional complexities that pressure regulation introduces.

Both types of tanks serve crucial roles in various industries, and understanding their differences is vital for ensuring safe handling and storage practices. The option that encompasses both pressurized and nonpressurized tanks reflects the diversity in tank design and usage in hazardous materials management.