Used 316 Sq Ft Horizontal SS Shell & Tube Heat Exchanger. 304-SS Shell rated 150 PSI @ 450 deg F. 304-SS Tubes rated 150 PSI/FV @ 450 deg F. Shell dia : 18". (268) tubes, 3/4" dia x 7' L. Nozzles: Shell - (2) 3"; Tubes - 6" in, 3" out. Mfg by Doyle & Roth.