Feldmeier Stainless Steel Triple Tube Heat Exchanger- 24 Tubes. Thickness: 0.065 in. Inner tube specifications: 1-3/8 in. diameter (inner dia.) x 20 ft. L, with a total holding capacity of 38.5 gals. Intermediate tube specifications: 1-7/8 in. diameter (inner dia.) x 19 ft. 7 in. L, with a total holding capacity of 29 gals. Outer tube: 2-3/8 in. diameter (inner dia.) x 18 ft. 4 in. L with a total holding capacity: 33 gal. Concentrically mounted tubes. In actual process, the heating or cooling medium travels in one direction through the inner tube and through the annular space between the intermediate and outer tubes. The product flows in the opposite direction through the annular space between the inner tube and the intermediate tube. This produces counter flow action. Substantial heat exchange efficiency results from this counter flow. Its (3) columns support the weight of the tubes and are used to attach unit to floor or base structure. Inlets/outlets: (5) 3 in. 'S' line fittings, one flange: 7-1/2 in. diameter, (4) holes, center to center: 6 in. L. Overall dimensions: 21 ft. L x 2 ft. 4 in. W x 5 ft. 5 in. H.