Blaw-Knox Shell and Tube Heat Exchanger. S/N: M5241. Tube material: 316 stainless steel. Number of passes: 4. Number of tubes: 8. Tube dimensions: 15/16 in. dia. x 10 ft. L. Heat transfer surface area: approx. 19.63 sq. ft. Tube volume: 2.8 gal. Heat exchanger dimensions: 18-3/4 in. diameter x 10 ft. L. (2) Pressure relief valves. Inlets: (1) 15/16 in. dia. S-line fitting, (1) 3-1/2 in. dia. media infeed. Outlets: (1) 15/16 in. dia. S-line fitting, (1) 2 in. dia. FNPT media discharge. Overall dimensions: 11 ft. 3 in. L x 1 ft. 9 in. W x 6 ft. 5 in. H. (XMR15)