Used 3579 Sq Ft Energy Exchanger Co. Vertical Stainless Steel Shell & Tube Heat Exchanger. 304L (Prtial) Shell rated 240 psig @ 530 F, 304 L Tubes rated 240 psig @ 350 F. (1586) 304L Tubes x 3/4" OD x 14 ga x 11' 6" Lg. Size 43 x 144 Type AEL. Lug Mounted. Serial #X-1167-A, National Board #296, Built 1980. Previous Use: Ethylene Oxide.