Unused 2882 Sq Ft Shell and Tube heat exchanger. Manufactured by Apex Engineered Products. Carbon Steel Shell rated 1685PSI @ 625F. (735) 1"OD x 180"L SA-213-T11 Carbon Steel Tubes rated 485PSI @ 835F. Alloy 625 Toroidal Expansion Joint. National Board #235. Serial #C-1275. Built 2018. Designed as a effluent waste heat boiler.