基于内检测数据的管道凹陷应变计算  

A calculation method for the strain of pipeline dents based on ILI data

作　　者：雷铮强[1] 陈健[1] 王富祥[1] 黄丰[2] 周利剑[1] LEI Zhengqiang CHEN Jian WANG Fuxiang HUANG Feng ZHOU Lijian(PetroChina Pipeline R ＆ D Center/National Engineering Laboratory for Pipeline Safety Wuhan University of Technology)

机构地区：[1]中国石油管道科技研究中心/油气管道输送安全国家工程实验室 [2]武汉理工大学

出　　处：《油气储运》2016年第12期1275-1280,共6页Oil & Gas Storage and Transportation

摘　　要：针对内检测中发现的凹陷对管道结构强度的影响问题,开展凹陷应变的计算分析,以期有效指导管道凹陷的开挖验证及修复工作。总结了基于内检测数据的凹陷应变计算方法和技术路线,指出了滤波分析的必要性和可行性。依据ASME B31.8-2010的相关规定,结合实际的管道内检测数据,得到了7种典型滤波方法下的应变计算结果。通过对比应变计算结果,分析了不同滤波方法对管道凹陷数据处理及应变计算的影响和适用性。结果表明:基于管道凹陷内检测数据的应变计算技术可行,低通滤波方法对管道凹陷数据的滤波效果较好,可获得较合理的凹陷应变计算结果;低通滤波方法中,选择合适的截止频率参数对凹陷应变的准确计算至关重要,截止频率的取值与内检测信号的噪声大小密切相关。In this paper, the strain of dents was calculated and analyzed to figure out the effect of dents identified by in- line inspection （ILI） on structural strength of pipelines, so as to provide effective guide for the excavating verification and restoration of pipeline dents. The calculation methods and technical routes of dent strain based on ILl data were investigated and summarized, and the necessity and feasibility of filtering analysis were presented. Combined with ASME B31.8-2010 standard and actual ILI data, the strain was calculated by using 7 typical filtering methods. The effects and applicability of different filtering methods on data processing and strain calculation of pipeline dents were studied by comparing the strain calculation results. It is shown that it is technically feasible to calculate strain based on ILl data of pipeline dents. Based on low-pass filtering methods, the pipeline dent data is well filtered and the calculated dent strain is more reasonable. As for low-pass filtering methods, the appropriate selection of cutoff frequency parameters is crucial to the accurate calculation of dent strain, and the value of cutoff frequency is in close relation with the size of noise contained in ILl signals. （6 Figures, 3 Tables, 10 References）

关 键 词：油气管道 内检测 凹陷 应变 低通滤波方法 完整性 

分 类 号：TE88[石油与天然气工程—油气储运工程]