Study on Effect of Station Grounding Materials on the Buried Pipeline Corrosion Rate and Cathodic Protection

Abstract

In order to understand the influencing laws of the cathodic protection effect of the grounding grid and the grounding buried pipelines, the numerical simulation calculation method was used to establish the electric field model of corrosion and cathodic protection of the station grounding system and the buried pipeline. The influencing law of the grounding electrode material and anode ground bed form and other factors on the electric potential distribution, corrosion rate and cathodic protection effect of the buried pipeline was investigated. Results indicated that the electropositive grounding materials would greatly accelerate the corrosion rate of buried pipeline nearby, causing the regional cathodic protection to fail to meet the standards. Therefore, the electropositive grounding materials should be avoided. At the same time, the optimal distribution of the near ground bed could better eliminate the shielding area caused by the grounding system, compared with the far ground bed. The above results could provide reference for the selection of grounding materials and the design of anodic ground bed for station regional cathodic protection system.

Keywords

• grounding system|numerical simulation|cathodic protection