Different Polarization Cells Based for Mitigating theAC Induced Voltages on the Metallic Pipeline

Abstract

Natural gas metallic pipelines are frequently passed by high-voltage overhead transmission lines (HVOHTLs). Corrosion may occur due to the parallelism between HVOHTLs and pipelines, where electromagnetic fields couple between them. Furthermore, these fields cause an AC voltage to generate on the buried pipeline. This study presents two examinations that use two several AC mitigation units: a potassium hydroxide polarization cell (KOH-PC) and a Solid State Polarization Cell (SSPC) to mitigate induced AC voltage and enhance cathodic protection performance. The solid-state polarization cell will contribute more controllability than the conventional cell. This paper proposes the electrical modeling for both KOH-PC and SSPC, in addition to their optimal configuration. This paper also presents a comprehensive comparison of optimal KOH-PC and SSPC parameters to give an effective solution to the AC corrosion problem. Finally, the optimal design of the SSPC gives the best performance in preventing AC corrosion.