Internal Corrosion by Chlorine Inspection

Corrosion by chloride compounds occurs only at temperatures below the dew point of water. This type of corrosion usually occurs below the liquid level, unless the vapor space is below the dew point. It can be very severe and highly localized. Carbon steel surfaces can become severely pitted, and grooves can occur where continuously moving liquid streams contact a vessel, such as at overflow weirs and reflux return nozzles.

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