Used 2781 Sq. Ft. Horizontal Missouri Boiler & Tank Company 304L Stainless Steel Shell & Tube Heat Exchanger. Shell rated 75 psi @ 475 F on the shell, and tubes rated 125 psi @ 475 F. Serial # H-5233, National Board #3131, Built 1971. Estimated weight - 15,000 lbs. Previous Use: Nitric Acid - Cooler Condenser, Stage 2 (Used in line - No Heads)