Application in deep vertical groundbeds of linear flexible anodes

Abstract

This paper is about a case of application of a new anode system in a vertical groundbed in Italy for the impressed current cathodic protection of gas distribution pipelines. This system offers significant advantages for the installation of impressed current cathodic protection groundbeds with easy and timesaving procedures, accurate Quality Check on the factory-made conductive connections and optimization of the current distribution. The reduction of anode resistance versus soil enables a relevant energy saving. The product is flexible even in current output and expected design life. It is possible to select parameters, like the Mixed Metal Oxide titanium anode diameter, the feeding cable insulation, the distance and number of joints between the anode and the cable to realize a specific product fit for purpose. The reduced diameter of this anode system will enable to design new wells with consistently reduced borehole diameter. Further cost optimization can be reached by concentrating the length of the active part of the anodic system, this resulting in a reduced perforation depth. Deep Vertical Groundbed (DVG) calculations for the design of new groundbeds are presented in details with examples of a traditional string of MMO titanium anodes and linear flexible anode as alternative options.