Used 103.75 Sq Ft Yula Corp Horizontal Shell & Tube Heat Exchanger, mounted on 2 saddles. Model #SO120, Shell rated 300 psi @ 250 F, Admiralty Brass Tubes rated 150 psi @ 250 F. (54) Tubes x 5/8" OD x 18 ga x 11' 9" Lg. Serial #10594, National Board #6085, Built 1981. Previous Use: Ethylene Oxide.