In mathematics there is a familiar axiom in which it states that the whole is the sum of the parts. This truism applies equally well in establishing success with materials of construction for a flue gas desulfurization system. The success or failure of selected materials of construction are the result of many factors. Unfortunately, much emphasis has been made solely on the proper selection of the material where as other factors have been minimized or frequently overlooked. The factors which should be considered are:

  1. understanding of the corrosion environment

  2. proper engineering design

  3. proper installation procedures

  4. relation of actual operating conditions to design conditions

It is the intent of this paper to emphasize the importance of each of these areas and illustrate how they can contribute to a successful experience with the selected materials of construction for a lime/limestone FGD system which today is the most economical commercially demonstrated technology.

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