Used 226 Sq Ft High Alloy, Shell & Tube Heat exchanger. Carbon Steel Shell rated 150 PSI/FV @ 350 deg F. (196) 3/4" dia Tantalum tubes rated 150 PSI/FV @ 350 deg F. Hastelloy Heads. Mfg by Cosmos Minerals, 1992, S/N: 13196-1, Shell NB #258. Head NB #311. Approx 17' OAL.