Used 3654.5 Sq Ft Energy Exchanger Company Carbon Steel Vertical Shell & Tube Heat Exchanger. Shell rated 240 psig @ 550 F, Tubes rated 240 psig @ 420 F, Type AEL, Size 49 x 144. (1551) Tubes x 3/4" ID x 14 ga x 12' Lg. Shell Dimension: 4' 2 1/2" ID x 12' Lg. Lug Mounted, Serial #X-1168B, National Board #291, Built 1980. Previous Use: Ethylene Oxide.