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09439 Application of Analysis and Control for Corrosion Damage In Cooling Water Systems Using Corrosion Monitoring

Product Number: 51300-09439-SG
ISBN: 09439 2009 CP
Author: Masazumi Miyazawa and Takao Otsu
Publication Date: 2009
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In chemical plants, there are lots of equipments for chemical products. Among these, heat exchangers are the most prominent. Because of this, heat exchanger maintenance is important in the maintenance management in chemical plants. While management techniques have been established for various fluids types, heat exchanger damage control is difficult when cooling is carried out using uncontrolled fluids such as raw river water. Heat exchanger damage has been increased due to the use of cooling water with unmonitored water quality in recent years. As a result, investigations were carried out into the measurement equipments that allow monitoring of the damage occurring in heat exchangers. As a result of these investigations, a corrosion monitor for on-site measurement was selected and adopted for use. In the cooling water system, the coupled multielectrode array sensors (CMAS) was found to be suitable for measuring the corrosion rate and the electrochemical noise method (ENM) was suitable for measuring changes in cooling water quality. This paper introduces a comparison for experimental evaluations of the two electrochemical methods, CMAS and ENM, and basis for the design of the corrosion monitoring device for cooling water system.

Keywords: corrosion monitoring, coupled multielectrode array sensors, electrochemical noise method, chemical plant corrosion, corrosion control, heat exchanger corrosion, cooling water corrosion
In chemical plants, there are lots of equipments for chemical products. Among these, heat exchangers are the most prominent. Because of this, heat exchanger maintenance is important in the maintenance management in chemical plants. While management techniques have been established for various fluids types, heat exchanger damage control is difficult when cooling is carried out using uncontrolled fluids such as raw river water. Heat exchanger damage has been increased due to the use of cooling water with unmonitored water quality in recent years. As a result, investigations were carried out into the measurement equipments that allow monitoring of the damage occurring in heat exchangers. As a result of these investigations, a corrosion monitor for on-site measurement was selected and adopted for use. In the cooling water system, the coupled multielectrode array sensors (CMAS) was found to be suitable for measuring the corrosion rate and the electrochemical noise method (ENM) was suitable for measuring changes in cooling water quality. This paper introduces a comparison for experimental evaluations of the two electrochemical methods, CMAS and ENM, and basis for the design of the corrosion monitoring device for cooling water system.

Keywords: corrosion monitoring, coupled multielectrode array sensors, electrochemical noise method, chemical plant corrosion, corrosion control, heat exchanger corrosion, cooling water corrosion
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