Used 289 sq ft National Heat Transfer shell and tube Heat Exchanger, Hastelloy C276 tubes, 316L tube sheet with (134) .75" diameter x 11' long tubes rated 150 psi at 350, carbon steel shell rated 150 psi at 350 f, 14", 8" tubes inlet/outlet, 2" shell inlet/outlet, serial# 850159-01, national board# 111, built 1985.