Used 2223 Sq Ft. Carbon Steel, U-Tube Heat Exchanger. Mfg by Superior Hardsurfacing, 1988. Carbon steel Shell (SA-516) rated 300 PSI @ 650 deg F; Carbon Steel Tubes (SA-214) rated 150 PSI @ 500 deg F. Carbon Steel Heads (SA-516). Shell - 2'7" dia. x 20'6"; (300) Tubes - .75" dia. Flanged Nozzles: (2) 10", (2) 8". Type - AEU. S/N: 88E-179B, Built to ASME Code, No NB number. Drawing and U-1 on file.