One of the greatest threats, sources of system failure, and maintenance/replacement costs
to mechanical systems is corrosion to the metallic surfaces of piping and equipment. For
corrosion to occur, three (3) elements are required: metal, air (oxygen), and water (electrolyte).
Since metal and air are constant, the contributing factor to corrosion is the introduction of
moisture. The corrosion process is accelerated with an insulated system when moisture
becomes trapped between the insulation and metallic surface. This condition is known as
corrosion under insulation (CUI).

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