Bell & Gossett Shell and Tube Heat Exchanger. Model SU66-4. S/N: P 83207-01. 2-Pass. Number of tubes: 44. Tube dimensions: 1/2 in. dia. x 55 in. L. Heat transfer surface area: 26.39 sq. ft. Volume: 2 gal. Shell side MAWP: 150 psi @ 375 °F. Inlets: (1) 2 in. dia. S-line fitting (product), (1) 4 in. dia., 8-bolt flanged port (media). Outlets: (1) 2 in. dia. S-line fitting, (1) 1 in. dia. pipe (media). Overall dimensions: 5 ft. 8 in. L x 1 ft. 7 in. W x 1 ft. H. (ACN24)