This industry comprises establishments primarily engaged in manufacturing power boilers and parts (including nuclear generated steam), and industrial heat exchangers, by the process of cutting, forming and joining metal plates, bars, sheets, pipe mill products and tubing, to custom or standard design, for factory or field assembly. These establishments may engage in both fabrication and installation.

This industry comprises establishments primarily engaged in cutting, forming and joining heavy gauge steel to manufacture tanks. Establishments primarily engaged in fabricating and erecting large storage tanks, which must be assembled at the site, are included.

This industry comprises establishments primarily engaged in forming light gauge metal to manufacture cans and other metal containers to store or transport products.