Used 1575 Sq Ft SS Heat Exchanger. CS Shell rated 150 PSI/FV at 400 deg. F. 304-SS Tubes rated 175 PSI at 375 deg. F. 304-SS Heads. Shell 28" dia x 20' L. - 1 Pass. (667) 3/4" tubes x 20' L.- 2 Pass. OAL: 15'. Shell nozzles: (2) 6", Tube nozzles: 1.5", (3)4". Type: BEM. Mfg by Joseph Oat & Sons, 1973, S/N: 2127-3A, NB# 612.