Three pipeline coating detection technologies, multiple-frequency current method, ground potential-electrical field method, and pipe-to-soil potential method, are introduced.
本文在分析国内外现有的防腐层检测技术的基础上，提出了地下金属管线防腐层状态检测的新方法----电流梯度法。
By the measured results of pipe to soil polarization potential after one year, it is shown that the design is reasonable and the technical targets fulfil the design requirements.
实施保护一年后的管道极化电位检测结果表明，牺牲阳极保护工程设计合理，技术指标达到了设计与规范要求。
By the measured results of pipe to soil polarization potential after one year, it is shown that the design is reasonable and the technical targets fulfil the design requirements.
实施保护一年后的管道极化电位检测结果表明，牺牲阳极保护工程设计合理，技术指标达到了设计与规范要求。
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