How do you best define system media?

In defining system media, the engineer should specify the type of fuel, sulfur content, and any additives, cleaning agents or catalysts which may be used in the system.  Ph in the vicinity of the expansion joint should be specified, if known, especially if the media is extremely acidic or caustic.

The probability of condensation is determined by comparing dew point and normal  operating temperatures.  Even in systems which are normally hot, shutdowns and startups may produce condensation resulting in excessive corrosion. HTIS condition can also occur on the outside of the steelwork and should be considered.

Abrasive components of the media, such as flyash needs to be considered. Flyash buildup within a flue gas duct should be estimated, and the dead weight calculated to determine the maximum load on an expansion joint element.  For example, if a fabric belt is capable of withstanding 3 PSIG pressure, it can withstand (3×144) 432 pounds per square foot of load, both flyash and pressure.

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