Used 86 Sq Ft Doyle and Roth Horizontal Carbon Steel Shell and Tube Heat Exchanger. Shell rated 150PSI/FV @ 550 F. (44) .75"OS x 10'L tubes rated 150PSI/FV @ 660F. Approximately 27" x 143". Weight 1,700 lbs. Serial #S2777-2. National Board #21584. Built 2015.