835Materials and Construction

These topics have been reviewed in previous sections. In summary:

1. High temperatures may require the use of special materials.

2. The chemical and physical properties of exchange fluids may require the use of special materials.

3. Contaminated fluids may require special materials and/or special construction.

4. The additions of tube fins on the outside, grooved surfaces or swaged fins on the inside, and treated or coated surfaces inside or outside may be required to achieve compactness or unusually high effectiveness.

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