Used 155 square feet vertical Graphilor Polyblock heat exchanger. MFD by Carbone, model PBC8D-9PU-1-4, Serial # 10945, built 1997. ASME code stamped for 161 psi @ 350 deg. F, -20 deg. F , shell side; 100 psi & FV @ 350 deg. F, -20 deg F on tube side. Single pass axial, 4 pass radial. Shell 10.75" OD x 128" long. Openings: Process side (2) 6", Service side (2) 1-1/2", (2) 3/4" drain. NB# 1169.