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Cathodic protection of a buried pipeline by solar energy

Revue des Energies Renouvelables Vol N ?? Cathodic protection of a buried pipeline by solar energy B Laoun K Niboucha and L Serir Applied Research Unit on Renewable Energies ? URAER ? Zone Industrielle Gaar Taam P O Box Gharda? a Algeria Scienti ?c and Technical Research Centre on Control and Welding Cheraga Algeria reçu le Janvier - accepté le Mars Résumé ?? La protection cathodique est employée intensivement sur les canalisations en acier dans l ? industrie de pétrole et de gaz C ? est une technique de prévention contre la corrosion qui transforme la canalisation entière en cathode d ? une cellule de corrosion Deux types de systèmes de protection cathodiques sont couramment appliqués Les systèmes de protection galvanique utilisent les anodes galvaniques également appelées les anodes sacri ?cielles qui sont électrochimiquement plus électronégatives que la structure à protéger et les systèmes à courant imposé par le biais d ? un générateur qui débitera un courant continu de l ? anode vers la structure à protéger L ? article proposé contribue au dimensionnement d ? un système de protection cathodique par courant imposé avec appoint électrique d ? énergie solaire appliqué à un pipeline Abstract ?? Cathodic protection is employed intensively on the steel drains in oil and gas industry It is a technique of prevention against the corrosion which transforms the structure into a cathode of a corrosion cell Two types of cathodic protection systems are usually applied The galvanic protection systems use the galvanic anodes also called the sacri ?cial anodes which are electrochemically more electronegative than the structure to be protected the other system is by imposed current powered by electrical generator with D C output towards the structure to be protected The object of this study is to design a cathodic protection system by impressed current supplied with solar energy panels applied to a pipeline Keywords Corrosion - Cathodic protection - Impressed current - Buried pipeline - Photovoltaic PRINCIPLE OF CATHODIC PROTECTION The principle of cathodic protection is based on the idea to reverse the electrochemical role of the structure to be protected by supporting a cathodic reduction on its level and by deferring the reaction of oxidation on another structure which we accepts the degradation A thorough grasp of the subject can be found on two major references DESIGN OF THE CATHODIC PROTECTION SYSTEM FOR A PIPELINE The well know cathodic protection system is implemented for a pipeline used or uid processing mainly described by some characteristics summarized in Table bralaoun yahoo fr C B Laoun et al Table Some characteristics of the pipeline Material Steel X Isolation resistance Length km Linear isolation resistance External diameter m Surface to protect m Longitudinal isolation resistance Attenuation coe ?cient Characteristic resistance ?m ?m - ?m - m- - ? The elements which constitute a cathodic protection system by impressed current supplied with solar energy are as follows Fig As a remark the system proposed is not the only one and not the only used in