Establishments primarily engaged in manufacturing power and marine boilers, pressure and nonpressure tanks, processing and storage vessels, heat exchangers, weldments and similar products, by the process of cutting, forming and joining metal plates, shapes, bars, sheet, pipe mill products and tubing to custom or standard design, for factory or field assembly. …
Examples: Absorbers, gas, Accumulators (industrial pressure vessels), Acetylene cylinders, Aftercooler shells, Air preheaters,
