Evaluation of perfect paint assumptions in modeling of cathodic protection systems |
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| Affiliation: | 1. Electromechanical Engineering College, Southwest Petroleum University, Chengdu, Sichuan 610500, China;2. Cowin Auto Technology Limited Company, Chengdu, Sichuan 610000, China;3. Engineering Training Center, Southwest Petroleum University, Chengdu, Sichuan 610500, China;4. China Southwest Engineering Co, Sinopec Group, Chengdu, Sichuan 610000, China;1. Department of Naval Architecture and Ocean Engineering, Pusan National University, Busan 609-735, Republic of Korea;2. Global Core Research Center for Ships and Offshore Plants (GCRC-SOP), Pusan National University, Busan 609-735, Republic of Korea;3. Department of Naval Architecture and Marine Engineering, University of Michigan, Ann Arbor, MI 48109, United States;1. Dipartimento di Chimica, Materiali e Ingegneria Chimica, “G. Natta”, Politecnico di Milano, Via Luigi Mancinelli 7, 20131 Milan, Italy;2. APCE, Associazione per la Protezione dalle Corrosioni Elettrolitiche, Via Maastricht 1, 20097 San Donato Milanese, Italy;1. Laboratoire de parasitologie-mycologie, Hôpital Cochinn 27 rue du Fbg St Jacques, 75014 Paris;2. Consultations de parasitologie-Mycologie, vaccinations internationnales, Hôpital Cochinn 27 rue du Fbg St Jacques, 75014 Paris |
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| Abstract: | Computational modeling often involves making assumptions; assumptions about geometric features, material characterizations or loading conditions. The validity of these assumptions will directly impact accuracy. It is an accepted practice in computational modeling of impressed current cathodic protection (ICCP) systems to define painted surfaces as perfectly insulated (‘perfect paint’). While many paint systems have a high resistance, the resistance is finite rather than infinite. In this work, painted surfaces are defined with varying material properties ranging from relatively high resistance (0.0001 of the polarization response of steel) to relatively low (steel). These different material properties are assigned to the painted surfaces of a previously validated shipboard ICCP system model. All other boundary conditions are held constant. A comparison of results quantifies the effects of large but finite paint resistance on computational results and validates use of the perfectly insulated surface assumption for painted surfaces. |
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