Outlet Headers Material
Hydrogen and ammonia plant reforming furnaces operate at outlet temperatures in excess of 1500°F. Outlet headers are usually built of Incoloy 800H, since this is one of the few alloys with sufficient strength and ductility for the
service. Outlet headers of Incoloy 800H should be constructed in accordance with HTR-MS-1872.
Selection of the proper welding electrode is essential in the fabrication and repair of these headers. Electrodes generally suitable for welding 800H vary widely in strength. Many stress rupture failures have occurred within the industry because one of the lower strength electrodes was used.