Used Approx. 31 Square Feet Astro Metallurigcal, Inc. Horizontal Titanium (Grade 2) Shell & Tube Heat Exchanger. Carbon steel shell rated 75 PSI/FV @ 400 deg F; Tube side: 150 PSI/FV @ 400 deg F. (20) Tubes, .75" OD. Shell: 6.625" diameter, 120" OAL. Serial # 54936, National Board #1624. Year Built 1994. Nozzles: Shell side: (2) 1", (1) 3"; Tube Side (2) 3". U-1 & Drawing on file.