Based On The TEM Examination To Pipeline’s Break Failure Analysis And Security Evaluation

This article intends to present more advanced international pipeline and pipelineinspection technology combines the reliability of safety assessment, fitness evaluationof the formation of a complete set of piping systems, including the choice of pipelinecorrosion detection technology, Failure analysis of pipes, pipe remaining lifeprediction and pipeline reliability of the safety assessment. The article corrodes theresult which using the pipeline the examination technology examines, and using somenew mixed computational method which in knowledge unions and so on fracturemechanics theory, limit analysis as well as theory of probability forms, then utilizesthe corrosion flaw pipeline’s fail-safe analysis and the security evaluation successfully.The main work is as follows:(1) Review the existing home and abroad corrosion detection methods, andselected the appropriate corrosion detection technology. For example，transientelectromagnetism examination technology. It can, in does not excavate in the situationwhich, does not stop loses to separate examines pipeline’s corrosion flaw. This articleelaborated transient electromagnetic method’s good and bad points, use its principle toseparate examine the pipeline corrosion flaw the accurate position and the averagewall thickness, after the process excavates, then uses the data which the supersonicexamination obtains to carry on the confirmation. After synthesis evaluation, obtainedhas utilized in the break failure analysis valid data.(2) The flaw pipeline carries on the fracture mechanics analysis. Data parameterwhich obtains using the examination, has carried on the stress analysis first to thepipeline, uses mediates the method which the tearing force study theory, the limitanalysis and the weighting function theory unify, obtained both simply and thepractical stress intensity factor computation expression. Then based on probabilitystatistical theory and limit analysis principle, to flaw pipeline whether to expire hascarried on the judgment, and has calculated pipeline’s residual strength.(3) Pipeline remaining life forecast. Introduced the CVDA-84standard and the Jintegral fracture mechanics’s computational method, has calculated pipeline’s criticalcorrosion flaw size, has forecast pipeline’s remaining life again using the probability statistical method.(4) Carries on the fail-safe analysis to the flaw pipeline. Elaborated the pipelinereliable major targets or quotas and the computation theory, introduced the pipelinereliable computational method, based on the break failure criterion, the unionprobability statistical theory, calculated pipeline’s reliability and the failure probability.Finally, this article has realized to pipeline’s fail-safe analysis and the securityevaluation.