Used 367 sq ft Pfaudler shell and tube Heat Exchanger, Hastelloy B2 tubes, tube sheets and bonnets with (208) .75" diameter x 9' long tubes rated 150 psi at 350 f, carbon steel shell rated 150 psi at 350 f, 8" tubes inlet/outlet, 3" shell inlet/outlet, model 16108-BEM, serial# E383-1265, national board# 42739, built 1984.