Used 104 sq ft. horizontal U-tube heat exchanger, mfg by JFD Tube & Coil. Carbon steel shell rated 200/FV @ -20 degrees to 450 degrees F. Carbon steel tubes rated 200/FV @ -20 degrees F to 450 degrees F. NB# 113. 12" dia x 51" long contains 76 tubes, 51" long by 5/8" OD. (1) 3", (1) 1 1/2", (1) 1" service side nozzels. (2) 4" process nozzles mounted on saddles. Built 1998. Serial# 98038.