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地上检测技术评价地下管道 涂层情况的测试方法 Chinese Translation Aboveground evaluation of the coating condition of underground metallic pipelines. Surveys: • Alternating current (AC) attenuation • Direct current (DC) • AC-voltage gradient • Pearson.
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地上检测技术评价地下管道 涂层情况的测试方法
Presents various techniques for aboveground evaluation of the coating condition of underground metallic pipelines, including the alternating current (AC) attenuation survey, direct current (DC) survey, AC-voltage gradient survey, and the Pearson survey. This standard is specifically intended to address buried onshore metallic pipelines and is based on available technology and methods that have successfully demonstrated evaluation of the coating condition of buried pipelines. Key words: aboveground, pipeline, AC, DC, Pearson, survey, onshore
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HISTORICAL DOCUMENT. This standard practice formalizes a methodology termed internal corrosion direct assessment for pipelines carrying normally dry natural gas (DG-ICDA)1,2,3 that can be used to help ensure pipeline integrity. The methodology is applicable to natural gas pipelines that normally carry dry gas, but may suffer from infrequent, short-term upsets of liquid water (or other electrolyte). This standard is intended for use by pipeline operators and others who manage pipeline integrity.
Presents procedures for performing close-interval DC pipe-to-electrolyte potential surveys on buried or submerged metallic pipelines.