469 sq. ft. vertical graphite cylindrical block heat exchanger. Mfg. by Carbone, type PBC18DL-7PU-1-1, SR# 111125. Built 1997. ASME code stamped for 150 PSI @ 400 degrees on shell side, 100 PSI @ 400 degrees F on tube side. NB# 1306. Openings:- Shell 2-6", tube side 1-14", 2-6".