Feldmeier 316 Stainless Steel Triple Tube Heat Exchanger-14 tubes. Media Tubes constructed of 304SS. Product Tubes constructed of 316SS. Tube thickness: 0.067 in. Outer tube: 4.0 in. diameter x 213 in. L, heating surface area: 18.59 sq. ft. Approximate liquid capacity: 11.5 gallons. Intermediate tube dimensions: 3.0 in. dia. x 234 in. L, heating surface area: 15.32 sq. ft. Approximate liquid capacity: 7 gallons. Inner tube dimensions: 1.5 in. dia. x 234 in. L, heating surface area: 7.66 sq. ft. Approximate liquid capacity: 1.8 gallons. Frame dimensions: 12 ft. 3 in. L x 2 ft. 5 in. W x 6 ft. 10 in. H. Inlets: (1) 2-1/2 in. dia. S-line fittings (media), (1) 2 in. dia. S-line fittings (product). Outlets: (1) 2-1/2 in. dia. S-line fittings (media), (1) 2 in. dia. S-fittings (product). Overall dimensions: 20 ft. 8 in. L x 2 ft. 5 in. W x 6 ft.10 in. H.