167 sq. ft horizontal 316L Stainless Steel one-pass heat exchanger. Built 1989 by Hebler Welding. Rated 100 psi @ 220 Deg. F.-tube side; 100 psi @ 220 Deg. F-shell side. 316 L SS Straight tubes: 81 tubes, 1" O.D. x 8' length. Carbon steel Shell: 14" O.D. x 8' length, overall length 10' 4". Heads are 316L SS. Previous Use: Potassium Sulfite.