Shell and tube heat exchanger S A Armstrong Limited

U-Tube Heat Exchangers

Armstrong U-Tube heat exchangers are designed for durability and include a removable tube bundle as a standard feature. The ‘U’-bend tube design provides a long service life by eliminating the effects of thermal expansion and contraction. It features carbon steel components, 3/4” (19 mm) copper tubes, and a rugged cast iron head. Components are also available in a selection of materials for use in specific applications.

Design Features
After extensive design and testing, Armstrong has developed the new, highly efficient and cost effective double-wall heat exchanger with a number of unique fea-tures. The double-wall tube-in-tube construction provides positive indication of potential cross contamination between the shellside and the tubeside fluids. Should either tube fail due to corrosion, erosion, or abrasive action, the resulting leak is channeled between the tube walls to a vent space created by double tubesheets between the head and shell flanges. Thus leaks can be detected on the outside of the unit before contamination of either fluid in the heat exchanger can occur. Thermal performance of the design is comparable to a conventional single tube heat exchanger of equal size and square foot surface area. This allows the double-wall unit to be used in place of an existing single-wall unit with minimal effect on performance. Armstrong double-wall tubes are mechanically rolled into both tubesheets, which results in a reliable leak-free joint at a low cost. As well, Armstrong replacement tube bundles can be easily adapted to fit most other U-bend heat exchangers providing the same advantages as an Armstrong unit.

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