706 Sq. Ft. Pfaudler 316 Stainless Steel Horizontal One Pass Shell and Tube Heat Exchanger. Rated 75 psi @ 350 ° F on shell side, rated 75 psi @ 350 ° F on tube side. (300) Tubes with ¾†OD x 12’ long. Shell has expansion joint. Shell inlet/outlet = 4â€. Shell diameter is 20â€. No heads. National Board #33660.