基金项目:2018年茂名市科技计划项目(编号:2018015)收稿日期:2022-06-21基于威布尔分布的原油长输管道腐蚀风险定量分析*王琪,李伟明(广东石油化工学院,广东茂名525000)摘要:管道腐蚀问题已经成为影响我国原油输配安全的重要影响因素,管道内检测是进行腐蚀泄漏风险预防的重要方法之一,但测量结果可靠性较低,一般腐蚀缺陷最大深度的可靠度仅为80%。为获得更高可靠度的腐蚀缺陷深度预测结果,需对检测数据进行进一步分析。以某原油长输管道为例,利用威布尔统计方法对各管段内腐蚀和外腐蚀的内检测数据进行统计建模,并采用3σ法则,提出了可利用内检测数据统计模型中0.999概率所对应的腐蚀缺陷深度值合理预测某一管段腐蚀缺陷极限深度的方法,通过该方法预测的腐蚀缺陷极限深度值可满足安全性要求,同时又可避免预测结果过于保守。利用3σ法则还能实现各管段腐蚀异常点位的精确识别。实践表明所提方法具有足够的可靠性,可为长输管道的安全风险管理提供理论支撑。关键词:内检验;威布尔分布;长输管道;腐蚀异常中图分类号:TE988文献标志码:A文章编号:1009-9492(2023)03-0163-05QuantitativeAnalysisofCorrosionRiskofCrudeOilPipelineBasedonWeibullDistributionWangQi,LiWeiming(GuangdongUniversityofPetrochemicalTechnology,Maoming,Guangdong525000,China)Abstract:PipelinecorrosionhasbecomeanimportantfactoraffectingthesafetyofcrudeoiltransportationanddistributioninChina.Pipelineinternaldetectionisoneoftheimportantmethodstocontrolcorrosionleakagerisk,butthereliabilityofthemeasurementresultsislow,andthereliabilityofthemaximumdepthofcorrosiondefectsisaround80%.Inordertoobtainmorereliablepredictionresultsofcorrosiondefectdepth,furtheranalysisoftestdataisrequired.Takingalongdistancecrudeoilpipelineasanexample,theWeibullstatisticalmethodwasusedtostatisticallymodeltheinternalandexternalcorrosiondetectiondataofeachpipelinesection.Accordingtothe3σrule,amethodwasproposedthatcouldreasonablypredictthelimitdepthofcorrosiondefectsinapipesectionbyusingthecorrosiondefectdepthvaluecorrespondingtothe0.999probabilityinthestatisticalmodelofinternalinspectiondata.Thepredictedlimitdepthofcorrosiondefectsbythemethodcanmeetthesafetyrequirements,andatthesam...