Used 2467 Sq Ft Merrick Mechanical Carbon Steel Horizontal Shell & Tube Heat Exchanger. SA-516-70 Shell rated 75 psi @ 150 F, -20 F @ 75 psi. Tubes rated 75 psi @ 150 F, -20 F @ 75 psi. (806) SA-214 Tubes x 3/4" OD x 14 ga x 15' 6" Lg. Mounted on 2 saddles, Serial #184, National Board #94, Built 1992. Previous Use: Ethylene Oxide.