Used 3784 Sq Ft Shell and Tube Heat Exchanger. Built by Slagle Mfg Co. 316 Stainless Steel Shell rated 900PSI @ 400F. (304) 1" Dia Titanium Tubes (2-Pass) rated at 900 PSI @ 400F. Nozzles (1)18" Inlet, (1)10" inlet, (1) 18" Outlet, (1)12"outlet. Serial #75788-5B. National Board #2015. Built 1988.