中俄东线天然气管道动态退磁实验

Dynamic demagnetization experiment on China-Russia Eastern Gas Pipeline

油气长输管道施工、检测过程中的剩磁会引发焊接电弧的磁偏吹,可能影响管道焊接作业的施工进度和质量,进而威胁管道本质安全。中俄东线天然气管道工程由于采用大口径、高钢级管道,具有较高的管道剩磁水平,对现有退磁技术与退磁设备的能力提出了更大的挑战。为此,引入永磁铁退磁技术,开展基于响应面法设计的中俄东线天然气管道动态退磁实验,实现了管道永久退磁,并通过管道电磁场仿真验证了实验结果的准确性。结果表明:退磁装置磁场强度是管道退磁效果的重要影响因子,随着退磁强度增大,退磁率逐渐增大;退磁装置运行速度对管道退磁效果的影响不明显。研究成果可为管道退磁技术发展提供新的研究方向和思路。

The residual magnetism produced during the construction and inspection of long-distance oil and gas pipelines can cause the magnetic blow of welding arc,which may affect the welding progress and quality of pipelines and even threaten their intrinsic safety.The high residual magnetism of China–Russia Eastern Gas Pipeline Project using largediameter and high-grade pipes brought a greater challenge to the available demagnetization technology and the service ability of demagnetization equipment.For this reason,the permanent magnet demagnetization technology was introduced,and the permanent demagnetization was realized through the dynamic demagnetization tests designed based on the response surface method.In addition,the accuracy of experiment results was verified by the electromagnetic field simulation of pipelines.The results show that the magnetic field intensity of demagnetization equipment is an important factor influencing the demagnetization effect of pipelines.Specifically,the demagnetization rate increases with the demagnetization intensity increasing.However,the operation velocity of demagnetization equipment does not affect the demagnetization effect significantly.The research results could provide a new research direction and idea in terms of the demagnetization technology for pipelines.