Used Enerquip Single Shell & Tube Heat Exchanger, 573 Square Feet, Model BEMV, 304L Stainless Steel, Vertical. 304L Stainless steel shell rated 150 psi at -20 to 375 degrees F. (394) 3/8" diameter x 174” long 304L stainless steel tubes rated 150 psi at -20 to 375 degrees F. 304L Stainless steel tubeshett and heads. Openings for tubes (2) 3", openings for shell (2) 6". National Board# 7450, serial# 9502, built 2007.