基于漏磁内检测与分级理念的管道完整性评价

Pipeline integrity assessment based on combining magnetic flux leakage detection with grading evaluation

为保证埋地油气管道的安全运行,结合漏磁内检测技术与分级评价理念,建立管道完整性评价模型。首先,根据管道风险评价及高后果区评价结果,选择待评价管段,经过清管、投放检测器、检测数据分析和检测结果验证等环节,获取可靠的检测数据。然后,将检测数据作为管道剩余强度评价的数据源,由低级评价方程到高级有限元分析,逐级对管体缺陷进行评价。最后,应用所建模型对国内某成品油管道的一个管段进行完整性评价。结果表明,漏磁内检测与分级评价能够实现良好的数据对接,检测出的缺陷目前均处于安全状态。

To ensure the safe operation of buried oil and gas pipelines,a pipeline integrity assessment model was built based on combination of the technology of magnetic flux leakage detection and grading evaluation. Then the specific implementation process of the model was discussed in detail. The model was divided into two stages,a detection stage and an evaluation stage. The former included selecting the pipe segment to be evaluated according to the pipeline risk assessment and high consequence area evaluation results,pigging,launching detector,detection data analysis and testing results verification. The latter included three levels of evaluation methods. Evaluation equation was taken as the lowest level of evaluation and the finite element analysis method was used as the highest level evaluation method. The detection data obtained by the detection stage was transmitted to the evaluation stage in this model. The model was used to assess the integrity of a certain products pipeline in China. The results show that the model is suitable for data transmission and all defects detected are in a safe state.