Hooper Welding ASME pressure vessels, ASME Stamps U U2 UM S H, steam drums, U-tube heat exchanger, shell & tube heat exchanger, nuclear heat exchangers, welding design and fabrication, U - Pressure Boilers, U2 - Pressure Boilers (Alternate Rules), S-Power Boilers, H-Heating Boilers, UM-Miniature Pressure Vessels, Inconel Subassemblies, High Pressure Steam Drums, Reactors, hydro treaters, boilers, towers, heat exchangers, stacks, flare tips, pipe fabrication shops, Hooper Welding, custom welding design and fabrication, filter separator, towers, stacks, high pressure filters, heavy wall welding fabrication, U, UM, S, H, heavy wall high pressure Steam Drums, Power Generation, Chemical, Environmental, Nuclear, Petroleum, Pulp & Paper, Water Treatment Our Clients. Founded in 1952 as a welding repair shop, Hooper Welding Enterprises has grown to become a recognized leader in the design and manufacture of pressure vessels, custom steel, and alloy fabrication.