Used- Doyle & Roth Shell & Tube Heat Exchanger, Approximate 169 Square Feet, Horizontal. Carbon steel shell rated 150 psi at -20 to 400 degrees F, (81) 1" diameter x 8' long 2205 duplex stainless steel tubes rated 175 psi at -20 to 300 degrees F. 2205 Duplex stainless steel tube sheet, 316L stainless steel heads. Serial# S2196, National Board# 20990, built 2010.