Buried-steel-pipeline-based magnetic anomaly extraction and interpretation method

Abstract

The invention provides a buried-steel-pipeline-based magnetic anomaly extraction and interpretation method. The buried-steel-pipeline-based magnetic anomaly extraction and interpretation method comprises the following steps: measuring magnetic induction intensity of the pipeline in an axial direction, alleviating outside interference anomaly and calculating a hazard index F, classifying anomaly level of a magnetic anomaly pipe section by combining the hazard index F, primarily judging defect type and establishing a model, forward modeling the model, determining the hazard defect position coordinate of the magnetic anomaly pipe section and forecasting the defect development process. By virtue of the method, the resolution ratio can be improved; the false anomaly information caused by the outside interference can be effectively eliminated; the position of a stress concentrating area of a pipe body determined and the hazard defect can be identified according to the detected magnetic anomaly data, within allowable deviation range, the abnormal position of a magnetic field of the pipeline can be rapidly determined by moving a magnetometer along the pipeline axis, the stress change caused by local metal defect of the pipe body can be deduced by combining the defected parameter and the change of the hazard index, and thus finally realizing magnetic anomaly extraction and fine interpretation of the buried pipeline stress defect.

Description

Technical field [0001] The invention relates to a method for extracting and explaining magnetic anomalies based on buried steel pipelines, and belongs to the technical field of nondestructive detection of buried and bare ferromagnetic pipelines. Background technique [0002] The non-contact magnetic inspection method is a brand-new non-destructive inspection technology invented by Russia. In recent years, relying on its significant advantages such as reliable detection principle, high detection accuracy, low comprehensive cost, low operational risk, and easy on-site implementation. At the same time, due to its important practical value and broad development prospects, this technology has gained popularity in the field of pipeline non-destructive testing. Wide attention from the industry. At present, the Russian Transkor-K Research and Development Center Co., Ltd. has completed 12,000km pipeline inspection using non-contact magnetic detection methods; the application of non-conta...

AI Technical Summary

Problems solved by technology

Due to the technical blockade adopted by Russia, only technical support and technical services are provided, which greatly limits the development and promotion speed of this technology

For actual detection, the non-contact magnetic detection technology has the disadvantages of low resolution, the inability to rule out abnormal external interference, the inability to distinguish the location of the stress concentration area of ​​the pipe body, and the disadvantages of blindly classifying the hazard level only by the hazard index

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