Used 298 Sq. Ft. Horizontal Stainless Steel Tube Heat Exchanger, built by Patterson Kelley, 1980. CS Shell rated 100 PSI @ 300F. 316-SS Tubes rated 100 PSI/FV @ 300F. CS Heads. (76) Tubes - .75" dia. x 18' L. Shell dia: 10" x 19'8" OAL . Passes: Shell: 1, Tubes: 2. Nozzles: Shell (2) 4", Tube (2) 4". Serial # 259109, NB Stamped.