Used 1,908 sq. ft. Doyle and Roth shell and tube heat exchanger, 304 stainless steel shell, tubes, tube sheets and bonnets, rated 30 psi / full vacuum @ 131 degrees F shell side, 60 psi @ 104 degrees F on tube side, with (444) 1" diameter x 197" tubes, 4 passes, 32" diameter shell, 19' 3" long overall, serial# J7837-3, national board# 17165, built 1995.