What shape are non-pressure cargo tanks designed with?

Non-pressure cargo tanks are specifically designed with elliptical cross-sections and flat heads for several reasons related to safety, structural integrity, and ease of manufacturing. The elliptical shape allows for an even distribution of stress across the tank when it is filled with liquid, which reduces the likelihood of deformation or rupture under various conditions, such as changes in temperature or pressure. The flat heads contribute to a uniform strength throughout the tank, allowing it to better withstand external forces.

Additionally, the elliptical design facilitates efficient cargo loading and unloading, as well as adherence to regulations for carrying non-hazardous materials. This design is common in the transportation of liquids, particularly those that do not require pressurization, making it suitable for various applications in the hazmat field.

In contrast, the other shapes described in the other selections do not typically meet the specific requirements and standards for non-pressure cargo tanks. For instance, rectangular and hexagonal designs do not provide the same structural benefits and may not conform to industry standards for transporting bulk liquids.