Used Vertical Shell and Tube heat exchanger. Manufactured by Armstrong Engineering Associates, Inc. Carbon steel Shell rated 250PSIG@400F. 8 5/8" OD x 86" tall. (24)1.05"OD SB-161 Nickel Alloy Tubes rated 100PSIG@400F. Serial #1570399. National Board #11775. Built 2014. R-Stamp. Weight 1125 lbs. Past use Chlorine Vaporizer.