某河底穿越管道环焊缝缺陷的安全评价  

Safety evaluation of girth weld defect of a river bottom crossing pipeline

作　　者：陈健[1] 汤怡[1] 孙雷[2] 李菲菲[2] 张海亮[2] 

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,河北廊坊065000 [2]中国石油管道公司,河北廊坊065000

出　　处：《油气储运》2014年第11期1222-1224,共3页Oil & Gas Storage and Transportation

摘　　要：某长输原油管道河底穿越段通过三轴漏磁和惯性测绘内检测发现存在环焊缝缺陷并伴有弯曲应变,需要对其安全性进行评价。采用英国标准BS 7910-2005中的结构完整性评价方法,对内压和弯曲应力复合载荷作用下该环焊缝缺陷的可接受性进行了评价。同时,对评价中涉及的弯曲应力、断裂韧性、缺陷深度、残余应力、缺陷长度和内压等参数进行了敏感性分析,讨论了各参数对评价结果的影响程度。结果表明:在当前工况下,该缺陷是可以接受的,暂时无需修复。基于完整性评价和敏感性分析的结果,对该管道的生产运行和监控提出了合理的建议。该评价方法和结论可作为解决其他类似工程问题的参考。Girth weld defect and bending strain are found in the river crossing section of a long-distance oil pipeline through the triaxial MFL and inertial mapping internal detection, so safety evaluation is required. The structural integrity evaluation method in the British standard BS 7910-2005 is used to evaluate the acceptability of girth weld defect under the combined load of internal pressure and the bending stress. Besides, the sensitivity analyses are carded out on the parameters including the bending stress, fracture toughness, defect depth, residual stress, defect length and internal pressure involved in the evaluation, and the influence of each parameter on the evaluation results is discussed. The result shows that under the current conditions, the defect is acceptable and no repair is required temporarily. Based on the results of integrity evaluation and sensitivity analysis, this paper gives reasonable suggestions on the running and monitoring of the pipeline. The evaluation method and its conclusion can be used as a reference to solve the problems of other similar projects.

关 键 词：安全评价 油气管道 环焊缝缺陷 敏感性分析 

分 类 号：TE832[石油与天然气工程—油气储运工程]