Used 3139 Sq Ft. U-Tube Heat Exchanger. Mfg by Heat Transfer Equip Co, 1988. Carbon steel Shell (SA-516) rated 150 PSI @ 500 deg F; Stainless Steel Tubes (SA-249-TP304) rated 150 PSI @ 500 deg F. Carbon Steel Heads (SA-516). Shell - 3' dia. x 24' L ; (385) Tubes - .75" dia. Flanged Nozzles: (2) 18", (2) 8", (1) 6", (1) 2" (2) 1". Type - AJU. S/N: 88-1684-A, NB# 955.