Analysis of safety status detection and evaluation technology for buried natural gas pipeline
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摘要: 提出了一种基于非接触磁应力检测的评价方法，用于确定埋地天然气管道的安全状态。首先建立了埋地铁磁管道非接触磁应力信号理论模型，然后通过自主研制的非接触扫描磁力计识别出磁异常管段，同时，定义了磁异常综合指数F来评估应力集中程度，并结合高后果区和地质灾害情况，确定了埋地天然气管道的安全状态。通过磁记忆检测技术对高风险管段进行了开挖检测。结果表明，非接触磁应力检测技术识别出了3处应力集中管段，其中1处Ⅱ级应力集中管段为高风险。开挖检测结果验证了该技术的准确性，表明该技术可对埋地天然气管道安全状态进行检测与评价。Abstract: This paper proposes an evaluation method based on non-contact magnetic-based stress detection to determine the safety status of buried natural gas pipelines. Firstly, a theoretical model of non-contact magnetic stress signal for buried ferromagnetic pipelines was established, and then the magnetic anomaly pipe section was identified through a self-developed non-contact scanning magnetometer. At the same time, the magnetic anomaly comprehensive index F value was defined to assess the degree of stress concentration. By combining with high consequences areas and geological disasters, the safety status of buried natural gas pipelines was determined. The excavation inspection of high-risk pipe sections was carried out through magnetic memory detection technology. The results show that three stress-concentrated pipe sections have been identified through non-contact magnetic stress detection technology. Among them, the safety status of the Ⅱ-level stress-concentrated pipe section is of high risk. The excavation test results verify the accuracy of the detection and evaluation results.
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