07266 Application of Corrosion Analysis and Corrosion Control by Using Corrosion Monitoring at Chemical Plants

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Product Number: 51300-07266-SG

ISBN: 07266 2007 CP

Author: Takao Ohtsu and Masazumi Miyazawa

Publication Date: 2007

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As part of their production process, chemical plants carry out chemical reactions with high temperature and pressure as operating conditions. They also handle substances which have a corrosive nature. These conditions make their operating environments more severe than that of other industries. Anti-corrosion measures are taken, but it is difficult to analyze the causes of the corrosion and devise control measures since the substances which are being handled are intricately intertwined. Because of these circumstances, a method is proposed which simultaneously measures the corrosion developing in the facility by using a corrosion monitor and assesses the operational conditions. Thus, the causes of the corrosion are identified by examining the correlation between these two factors. In this paper, a method is proposed that measures the corrosive state of a chemical facility by a corrosion monitor and then compares it with the operational conditions in order to determine the causes and establish control measures. The electrochemical noise method is adopted for the corrosion monitor, since this method has a high reaction speed as well as a good level of safety because the electric current does not need to be externally applied. In addition, existing corrosion monitors were revised for on-site measurements by examining their specifications, among other measures. An example case is introduced in which the repair interval at a chemical facility was extended from two years to ten years or longer as a result of the implemented control measures.