In terms of foundation, what type must horizontal ASME containers rest on?

Horizontal ASME containers are required to rest on a solid foundation such as concrete or masonry to ensure stability and safety. This foundation type provides a robust and durable support structure that helps to distribute the weight of the container evenly and prevents potential settling that could lead to structural issues or leaks. Concrete and masonry are ideal because they can withstand the environmental conditions and physical stresses that such containers may encounter over time, including those from seismic activity or temperature changes.

Using alternatives, like wooden beams or soil pads, may introduce risks related to moisture absorption, instability, and uneven settling, which could compromise the integrity and safety of the container. Plastic casings do not provide the required strength and durability for the heavy load of horizontal ASME containers, thus making concrete or masonry the only appropriate choice for their foundation.