Used Enerquip U Tube Shell & Tube Heat Exchanger, Approximately 800 Square Feet, Model BEUH, Stainless Steel, Horizontal. 304L Stainless steel shell rated 150 psi at -20 to 300 degrees F. (354) 1/2" diameter x 108” long 304L stainless steel tubes rated 150 psi at -20 to 300 degrees F. 304L Stainless steel tubeshaeet and head. Openings for tubes (2) 3", openings for shell (2) 3". National Board# 7540, serial# 9661, built 2007.