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. Establishments primarily engaged in manufacturing warm air heating furnaces are classified in Industry 3585; those manufacturing other nonelectric heating apparatus, except power boilers, are classified in Industry 3433; those manufacturing household cooking apparatus are classified in Industry 3631; and those manufacturing industrial process furnaces and ovens are classified in Industry 3567.

• Absorbers, gas
• Accumulators (industrial pressure vessels)
• Acetylene cylinders
• Aftercooler shells
• Air preheaters, nonrotating: plate type
• Air receiver tanks, metal plate
• Airlocks
• Annealing boxes, pots, and covers
• Atomic waste casks
• Autoclaves, industrial
• Baffles
• Bails, ladle
• Bins, prefabricated metal plate
• Boiler shop products: industrial boilers, smokestacks, and steel tanks
• Boilers: industrial, power, and marine
• Boxes, condenser: metal plate
• Breechings, metal plate
• Buoys, metal
• Cable trays, metal plate
• Caissons, metal plate
• Cars for hot metal
• Casing, boiler: metal plate
• Casings, scroll
• Chutes, metal plate
• Condensers, barometric
• Condensers, steam
• Containers, shipping metal plate (bombs, etc.)except missile casings
• Cooling towers, metal plate
• Cryogenic tanks, for liquids and gases: metal plate
• Culverts, metal plate
• Cupolas, metal plate
• Cyclones, industrial: metal plate
• Cylinders, pressure: metal plate
• Digesters, process: metal plate
• Ducting, metal plate
• Economizers (boilers)
• Evaporators (process vessels), metal plate
• Exchangers, heat: industrial, scientific, and nuclear
• Farm storage tanks, metal plate
• Fermenters (process vessels), metal plate
• Floating covers, metal plate
• Flumes, metal plate
• Forms, collapsible: for tunnels
• Fractionating columns, metal plate
• Fuel tanks, metal plate
• Fumigating chambers, metal plate
• Gas holders, metal plate
• Gas tanks, metal plate
• Heat transfer drives (finned tubing)
• High vacuum coaters, metal plate
• Hoods, industrial: metal plate
• Hooks, crane: laminated plate
• Hoppers, metal plate
• Housing cabinets for radium, metal plate
• Housings, pressure
• Hydropneumatic tanks, metal plate
• Intercooler shells
• Jackets, industrial: metal plate
• Kettles (process vessels), metal plate
• Knockouts, free water: metal plate
• Ladles, metal plate
• Liners, industrial: metal plate
• Liquid oxygen tanks, metal plate
• Melting pots, for metal
• Missile silos and components, metal plate
• Mixers for hot metal
• Nuclear core structurals, metal plate
• Nuclear shielding, metal plate
• Oil storage tanks, metal plate
• Penstocks, metal plate
• Perforating on heavy metal
• Pile shells, metal plate
• Pipe, large diameter: metal plate-made by plate fabricators
• Plate work, fabricated: cutting, punching, bending, and shaping
• Precipitators (process vessels), metal plate
• Pressure vessels, industrial: metal plate-made in boiler shops
• Pressurizers and auxiliary equipment, nuclear: metal plate
• Reactor containment vessels, metal plate
• Reactors, nuclear: military and industrial
• Retorts, industrial
• Rocket transportation casings
• Separators, industrial process: metal plate
• Septic tanks, metal plate
• Skid tanks, metal plate
• Smelting pots and retorts
• Smokestacks, boiler plate
• Space simulation chambers, metal plate
• Spheres, for liquids or gas: metal plate
• Standpipes
• Steam jet after coolers
• Steam jet inter condensers
• Sterilizing chambers, metal plate
• Stills, pressure: metal plate
• Storage tanks, metal plate
• Surge tanks, metal plate
• Tanks for tank trucks, metal plate
• Tanks, metal plate: lined
• Tanks, standard and custom fabricated: metal plate-made in boiler
• Towers, tank: metal plate
• Towers: bubble, cooling, fractionating-metal plate
• Trash racks, metal plate
• Troughs, industrial metal plate
• Truss plates, metal
• Tunnel lining, metal plate
• Tunnels, vacuum: metal plate
• Tunnels, wind
• Vacuum tanks, metal plate
• Vats, metal plate
• Vessels, process and storage: metal plate (made in boiler shops)
• Water tanks, metal plate
• Weldments