Armstrong Double Wall Heat Exchanger

Armstrong double wall heat exchanger for potable water and process heating and cooling systems. After extensive design and testing, Armstrong has developed the new, highly efficient and cost effective double-wall heat exchanger with a number of unique features. The double-wall tube-in-tube construction provides positive indication of potential cross contamination between the shell side and the tube side fluids. Should either tube dail due to corrosion, erosion, or abrasive action, the resulting leak is channeled between the tube walls to a vent space created by double tube sheets 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 heat exchanger 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 tube sheets, 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 provided the same advantages as an Armstrong unit.

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