1990 Bell & Gossett SU - Series Shell and Tube Heat Exchanger. Heat transfer surface area: 75 sq. ft. Materials of construction: cast iron head, steel shell and ¾ in. copper tubes. Design pressure: 150 PSI. Test pressure: 300 PSI. Design temperature: 375°F. Diameter: 8 ft. 5 /8 in. The SU-series tube bundles are of “U”-bend construction. This allows ample expansion or contraction for wide temperature variations. Tube spacers properly support and space each tube for maximum efficiency in steam condensing and drainage. Inlets/Outlets: (1) 6 in. effective port flange dia. (8) 7/8 in. mounting hole dia. (2) 2-1/4 in. FNPT. (1) 5/8 in. FNPT. Approximate shipping weight: 364 lbs. Overall dimensions: 9 ft. 7 in. L. x 1 ft. 4 in. W. x 1 ft. 1 in. H.