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首页> 外文会议>Sensors and systems for reliability, safety and affordability >CORROSION DETECTION ON NATURAL GAS PIPELINES WITH MICRO-LINEAR POLARIZATION RESISTANCE SENSORS
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CORROSION DETECTION ON NATURAL GAS PIPELINES WITH MICRO-LINEAR POLARIZATION RESISTANCE SENSORS

机译：带有微线性极化电阻传感器的天然气管道腐蚀检测

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This paper presents an experiment adapting linear polarization resistance-based corrosion sensors, originally developed for aerospace applications, to measure the corrosion rate of API 5L ERW grade-B steel natural gas line pipe using micro-sized linear polarization resistance (μLPR) sensors made from the same alloy and grade steel. Sensors were installed under a 15 mil coating of fusion-bonded epoxy, at various proximities to a 1/8 inch defect introduced at a weld joint and along the pipe seam. After sensor installation the pipe was buried in an controlled environment with soil amended to a pH of five. This environment was held at a temperature above 35℃ while soil moisture content was modulated between wet and dry cycles, each lasting seven days. LPR and environmental measurements were sampled at five minute intervals. Post processing was performed to convert the LPR measurements to a surface-loss. Comparisons made in the data showed API 5L ERW grade-B steel natural gas pipelines were highly susceptible to corrosion along the seam, with all sensors showing activity in this region early in the experiment. Sensors adjacent to a weld joint began to display evidence of corrosion more slowly. These results verify the ability of μLPR sensors to measure corrosion activity under protective coatings in underground environments.
机译：本文提出了一项实验，该实验采用了最初基于线性极化电阻的腐蚀传感器，该腐蚀传感器最初是为航空航天应用而开发的，使用由以下材料制成的微型线性极化电阻（μLPR）传感器来测量API 5L ERW B级钢制天然气管道的腐蚀速率相同的合金和等级钢。将传感器安装在15密耳的熔融粘合环氧树脂涂层下，以各种接近度将1/8英寸缺陷引入焊缝并沿管缝引入。传感器安装后，将管道埋入受控环境中，将土壤的pH值修改为5。该环境温度保持在35℃以上，而土壤水分在干湿循环之间进行调节，每次持续7天。 LPR和环境测量每五分钟取样一次。进行后处理以将LPR测量值转换为表面损耗。数据比较表明，API 5L ERW B级钢制天然气管道在接缝处极易受到腐蚀，所有传感器在实验初期均显示该区域的活动。靠近焊缝的传感器开始更缓慢地显示腐蚀迹象。这些结果证明了μLPR传感器能够测量地下环境中保护涂层下的腐蚀活性。

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