在用对二甲苯(PX)输送埋地管道的外腐蚀检测

External Corrosion Testing of In-Service Buried Pipeline for PX Transportation

将外腐蚀直接评价方法应用于对二甲苯(PX)输送埋地管道的外腐蚀检测。分别对其进行敷设环境调查、土壤腐蚀性检测、阴极保护检测和防腐层检测,并对检测结果进行评级。防腐层检测中,应用C扫描检测防腐层绝缘电阻率,综合运用Pearson法和密间隔电位法(CIPS)确定防腐层破损点位置。通过开挖,验证了该组合检测方法的有效性,为埋地管道防腐层检漏提供高效、准确的新方法。

External corrosion direct assessment method was applied to PX transportation pipeline External Corrosion Testing. The buried pipeline testing consisted of environmental investigation, soil corrosion detection, cathodic protection testing and detection of anticorrosive coating. The testing results were rated. In the detection of anticorrosive coating, C-scan was applied to test coating insulation resistance, and Pearson method and the closeinterval potential survey（CIPS） were used to determine coating damage point. The excavation confirmed that the combination of detection methods was effective. Efficient and accurate new method was provided for underground leak detection of pipeline coatings.