Which material is commonly used for large-volume nonpressurized horizontal storage tank shells?

The material that is most commonly used for large-volume nonpressurized horizontal storage tank shells is steel. Steel is favored in this application due to its strength, durability, and cost-effectiveness. It can withstand the various environmental factors and pressures associated with the storage of liquids, making it ideal for large tanks. Steel also provides structural integrity and resistance to deformation over time, ensuring that tanks maintain their shape and function effectively over long periods.

In the context of other materials, copper is typically used in smaller applications, such as plumbing or electrical components, rather than for large storage tanks. Plastic, while lightweight and resistant to corrosion, may not offer the same level of structural integrity as steel in large volumes or under certain conditions. Aluminum, while lighter than steel, does not have the same widely recognized application for large storage tanks due to cost and strength considerations. Therefore, steel remains the predominant choice for constructing large-volume nonpressurized horizontal storage tanks.