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Underdeposit Corrosion On Chiller Tubes
Underdeposit Corrosion is a special type of corrosion that is likely to occur in cooling systems where scales or foulants exist. The presence of general fouling and scales can cause the formation of a differential cell, which begins the process of corrosion. Due to the difference in oxygen concentration at the metal surface beneath the deposit and the oxygen concentration in the water, a differential cell forms, resulting in the corrosion reaction.
Prevention In order to prevent corrosion, the concentration of biocides into the water stream must be controlled. There are several options that should be used in combination to combat this problem: Maintain a strict water treatment program and monitor it closely, automating all chemical feeds and bleed-off Install inspection spool pieces in piping in at least 2 locations or (other monitoring devices) Perform ultrasonic testing to establish actual corrosion rates Add full flow or side stream water filtration, such as LAKOS Heat Transfer products Chemically sterilize the condenser or any process water piping twice per season And more	Sources and Causes The food-processing industry uses water for washing, transporting, blanching, cooking, cooling, and cleaning. In particular, heating and cooling processes require large amounts of water. Underdeposit corrosion is caused by using water in boilers, rotary cookers, and hydrostatic sterilizers. Aluminum alloys are susceptible to underdeposit corrosion. Stainless steels are also susceptible to underdeposit corrosion, as well as deep pitting. Anodic, cathodic, and filming inhibitors are used to mitigate corrosion. Biocides such as chlorine dioxide and bromine compound (oxidizers) are used for sterilization; however, these chemicals can interfere with the performance of the inhibition system. LINKS to More Information: TESTING SERVICES http://www.eci-ndt.com/index.htm http://www.corrview.com/corr_06.htm

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