Used 794 sq. ft. vertical Graphite cylindrical block heat exchanger. MFD by Carbone, Model PB24-20PU-1-2, built 2002. Shell Side: 100 PSI/FV @ 350 deg. F.; Tube side: 70 PSI/FV @ 350 deg. F. CS Shell, 2' dia x 18' 4" OAL. 20 blocks, 9.45"thick, 336 Radial Holes and 504 axial holes per block. NB# 1920.