Used Enerquip U Tube Shell & Tube Heat Exchanger, Approximately 500 Square Feet, Model BEUB, Stainless Steel, Horizontal. 304L Stainless steel shell rated 150 psi at -20 to 300 degrees F. (218) 1/2" diameter x 108” long 304L stainless steel tubes rated 150 psi at -20 to 300 degrees F. 304L Stainless steel tube sheet, 316L stainless steel head. Openings for tubes (2) 2", openings for shell (2) 3". National Board# 7539, serial# 9659, built 2007.