严重腐蚀减薄后低碳钢管壁厚的远场涡流检测

摘要

在役换热器的低碳钢管通常用于循环水与工艺介质之间的热交换。一般情况下低碳钢管主要发生冲刷腐蚀和垢下腐蚀；若管壁严重腐蚀减薄甚至爆管，会影响换热器的正常运行。对换热器低碳钢管的检测，目前最有效且快速的方法是利用涡流检测技术(ET)，对发生腐蚀减薄的低碳钢管用远场涡流检测技术(RFT)测量出较准确的壁厚值，依此可以判断低碳钢管的残余寿命，并对该换热器的监测及技术改造提供参考依据。%Low carbon steel tube is usually used in circulating water of the heat exchanger in service with the process medium.Normally,there exist mainly scouring corrosion and scale corrosion.In the case of tube wall being seriously thinned due to corrosion the burst might occur and the normal operation of the heat exchanger would be affected.So far the most effective and rapid method for the heat exchanger tube inspection is to use the eddy current testing technology(ET).For corrosion induced wall thickness thinning of low carbon steel tube the remote field eddy current testing technology(RFT)can accurately measure the thickness value,and this can determine the residual life of the tube.The above-mentioned method can be used to monitor the equipment and provide a reference basis for the technical innovation of the heat exchanger.