腐蚀管道剩余强度计算方法研究和修正

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Abstract：Thisstudyaims toimprove theaccuracyandadaptabilityof thecalculationresultsof theresidualstrengthofcorroded pipelines.Afteranalingthedifereneofcommonlyusedevaluationmetods，tedifereceintedevelopmentofvoumetriccorosion defectsandcackdefects tothepasticonewasverifedbasedonfinitelementanalysisAditionalltheswellingcoefcentuder diferentequivalentdfectlengthsanddepthswasbtainedbasedontheinversecalculationmethod，andtheswelingcoffenwas revised.Finally，theerrordistributionofdiferentcalculationmethdswascalulated.Theresultsshowthattheflowstressandthe residualstrengthoftitactpipeavelilinfuenconteesialstregthofteorrdedpipehiletesellngcofnthsa greatinfluenceontheresidualstrengthofthecorrodedpipe.Whenthecorosiondepthisshallow，theplasticzonedevelopsfromthe defectend.Whenthecorosiondepthisdp，theplasticzonedevelopsfromthedefectendandthemiddlesimultaneously.Therelative errorswithin ±5% of ASME B31G standard，modified ASME B31G standard，DNV-RP-F101 standard，API579-1 standard，and the calculationresults of the proposed method were 22.03% 20.33% 38.98% 22.03% ，and 55.93% ，respectively.Therefore，thismethod is of higher practicality.

Keywords：corrosion defect; residual strength;flow stress; swelling coefficient; pipeline; crack defect

油气管道在服役过程中，受输送介质、土壤性质、大气环境、杂散电流等因素的影响，不可避免地会发生不同程度的腐蚀，导致壁厚减薄、承压能力下降，一旦发生穿孔泄漏，将会引发严重的经济损失和环境破坏[1-2]。（剩余6289字）