基于内检测数据的腐蚀管道完整性评价

Integrity Evaluation of Corroded Pipeline Based on Internal Inspection Data

完整性评价是完整性管理中的重要环节。GB 32167-2015《油气管道完整性管理规定》中建议优先采用内检测数据对管道的完整性进行评价。基于工程实例,对某管线内检测检出缺陷进行分级、分类评价,并根据评价结果制定相应的维修响应策略。结果表明,该管道的内腐蚀较为严重,且集中在5~7点钟方向,可采用预估维修比(ERF)作为缺陷是否需要进行维修响应的判定条件。通过综合分析,所有缺陷ERF均小于1,剩余强度满足要求;应立即响应的缺陷共有6处,可在1 a内计划响应的缺陷共有85处;应在2024年7月13日前再次开展内检测作业。

Integrity assessment is an important part of integrity management.It is recommended in GB32167-2015 Oil and Gas Pipeline Integrity Management Specification that the internal inspection data is preferred to evaluate the integrity of the pipeline.Based on the project example,the detected defects in a pipeline are graded and classified,and the corresponding maintenance response strategy is formulated according to the evaluation results.It is shown that the pipeline internal corrosion is serious and concentrated in the 5 to 7 o′clock direction.The estimated service ratio(ERF)can be used as the criterion for determining whether a defect requires a service response.Through comprehensive analysis,it is found that the ERF of all defects in the pipeline are less than 1,and the residual strength meets the requirements.6 defects should be responded for maintenance immediately,and 85 defects can be responded within 1 year.The time for retesting is recommended till July 13,2024.