小口径低压低流量管道电磁涡流内检测应用

Application of Electromagnetic Eddy Current Internal Inspection in Small-Diameter, Low-Pressure and Low-Flow Pipelines

摘要: 油气管道长期在地下运行，会因为受到腐蚀破坏，产生泄露的风险，需要定期进行内检测，根据内检测结果进行相应的维护维修措施，确保管道安全运行。但是有些小口径管道输送流量与运行压力较低，且存在小半径弯头，不具备进行漏磁、超声内检测的条件，文中简单介绍了涡流检测原理，以及差分探头涡流检测器技术原理，并以差分探头涡流检测器在某小口径低压低流量管道中的运用为例，展示电磁涡流检测器检测小口径低压低流量管道的内检测，并开挖验证，其检测精度符合标准要求，差分涡流检测器在该管道的运用为小口径管道的内检测提供了一种解决方法。

Abstract: Oil and gas pipelines run underground for a long time and may be damaged by corrosion, which may lead to leakage risks. The pipeline requires regular internal inspections, and corresponding maintenance or repair measures should be implemented based on the inspection results to ensure its safe operation. However, some small-diameter pipelines have low flow and operating pressure and small radius elbows, which do not meet the conditions for magnetic flux leakage and ultrasonic internal detection. This paper briefly introduces the principle of eddy current detection, and the theory of eddy current detection with differential coil sensor, This paper takes the application of eddy current detector with differential coil modle in a small-diameter, low-pressure and low-flow pipeline as an example to demonstrate the internal detection method of electromagnetic eddy current detector for small-diameter, low-pressure and low-flow pipelines. The detection accuracy is verified and meet the standard requirements through excavation. The application of eddy current detector with differential coil sensor in this pipeline provides a solution for the internal detection of small-diameter pipelines.