To control the interference and corrosion hazards of DC stray current on buried steel pipelines (hereinafter referred to as pipelines), and to standardize the technical requirements for DC interference protection, this standard is formulated. 1.0.2 This standard is applicable to the investigation and testing of direct current interference in pipelines, as well as the design, construction, and maintenance of direct current interference protection engineering. 1.0.3 Pipeline DC interference protection work should not only comply with this standard, but also comply with the current relevant national standards. Terminology 2.0.1 Stray current refers to the current flowing in a non specified circuit. 2.0.2 DC interference refers to the direct current disturbance within a structure caused by direct current stray current. 2.0.3 Interference source refers to a facility that generates stray current, also known as a stray current source. 2.0.4 DC Stray Current Corrosion: Corrosion caused by DC stray current. 2.0.5 The cathodic area of the pipeline where stray current flows from the soil to the pipeline. 2.0.6 Anodic area of pipeline stray current flowing from the pipeline to the soil. The alternating area of pipeline in 2.0.7 is an area where the direction of stray current flowing into or out of the pipeline constantly changes. This area sometimes flows from the pipeline to the soil, and sometimes from the soil to the pipeline. 2.0.8 Interference Prevention: In order to prevent interference and corrosion of buried steel pipelines, methods such as drainage, adding cathodic protection, repairing anti-corrosion coatings, and electrical shielding are adopted to control and control interference. 2.0.9 Drainage is a protective technology that reduces the impact of direct current interference in pipelines by artificially forming a path that allows the interference current in the pipeline to directly or indirectly flow back to the negative regression network of the interference source
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