输油管道腐蚀状况与剩余强度分析

Analysis of corrosion conditions and residual strength of oil pipeline

针对发生了腐蚀爆管的某输油管段,测量其腐蚀爆裂区域面积、腐蚀坑尺寸以及分布情况,运用SEM和XRD方式分析了腐蚀产物的成分,并对管道腐蚀剩余强度进行计算。结果表明:该管道防腐层基本脱落,爆裂口处腐蚀减薄最为严重,最大腐蚀深度6.03mm,腐蚀坑呈不连续分布;腐蚀产物主要成分为Fe3O4,腐蚀产物层相对致密,且存在许多微裂纹,微裂纹最大宽度为8m;管道爆裂口处的腐蚀剩余强度最低,仅为2.07MPa。基于上述分析,基本掌握了该管道的整体腐蚀状况,可为制定安全运行方案提供参考依据。

In the light of some oil pipeline sections being subject to bursting by corrosion,size of corrosion burst area as well as size and distribution of corrosion pits are measured,ingredients of the corrosion products are analyzed by SEM and XRD,and the residual strength of corroded pipeline is calculated and analyzed.The results show that the pipe coating was peeled basically,and the most serious corrosion thinning at the cracking opening could be seen with the maximum corrosion depth of 6.03 mm,corrosion pits appeared a discontinuous distribution,a major component of the corrosion products was Fe3O4,the corrosion product layer was relatively dense with many micro-cracks subject to maximum width of 8 μm,and corrosion residual strength at the cracking opening was the lowest,only 2.07 MPa.Based on the above analysis,overall corrosion conditions of the pipeline are basically revealed,and the analysis results can be taken as a reference basis for the development of a safe operation program.