Used 1424 sq ft Doyle & Roth shell and tube heat exchanger, 304 stainless steel shell, tubes, tube sheets and bonnets, with (332) 1" diameter x 197" tubes rated 25 PSI (FV) at 140 F. Shell rated 57 PSI at 140 F, 4 passes, 28" diameter shell, 235" overall length, Serial# J7837-2, National Board# 17167, built 1995.