Used 100 Sq Ft Alpha Laval Spiral Heat Exchanger, Model 1-H. Max Pressure 75 PSI At 175°F, Max Design Metal Temp. 20°F At 75 PSI, Head Material Sa-516-70, Thickness .95", Shell Material Sa-240,304, Thickness .105". Built 1995. S/N: 21878, U-Stamp. 24" Diameter x 36" Overall Length.