腐蚀管道的安全评定

Safety Assessment of Corroded Pipeline

系统地阐述了在役管道的安全评定方法。根据管道不同形式的腐蚀缺陷 ,提出了爆破失效模拟的非线性有限元方法 ,建立了能反映缺陷深度、内压、缺陷处最大应力、管材性能参数等四者关系的管道安全评定线图。考虑到影响管道安全诸多因素的复杂性和不确定性 ,提出了基于可靠性的评定理论与方法 ,即依据管道的腐蚀检测数据计算每公里管道的失效概率 ,可以全面反映管道沿线的安全状况 。

This paper presents systematically the safety assessment method for in servic e pipelines.The nonlinear finite element method is established to simulate the burst failure of a p ipe containing the various kinds of corrosive defects.The curve diagram which can reflect the relationship among defect depth,internal pressure,maximum stress in defect and pipe materi als performance parameters is set up and it can be conveniently used by the technicians in the field.In order to consider the comp lexity and uncertainty of many factors concerning with pipeline safety,the reliability-based assessment t heory and method are presented.It can compute the failure probability along the total length of pipe lines according to corrosion inspection data and represent completely the safety status of the pipeline.In p rediction of the remaining life of the pipeline,the probabilistic mathematical model is presented based on the corrosive rates to predict the failure probability.The software system developed embodies safety assessment da tabase,corrosion analysis,pressure distribution analysis,residual strength assessment,remaining lif e prediction and maintenance decision making in the whole body.It can effectively analyze and evaluate the safety status in different operation stages.It aids carrying out scientific dynamic management to the pipe line.It has a reasonable system design.Users can use it easily.