腐蚀缺陷对油气管道失效压力及等效应变的影响

Effect of corrosion defects on failure pressure and equivalent strain of oil and gas pipelines

分析了油气管道腐蚀的原因及危害性,以60号钢作为研究对象,根据油气管道的本身特点以及腐蚀机理,采用ANSYS有限元分析软件,考察了腐蚀缺陷深度系数、长度系数以及腐蚀位置对油气管道失效压力和等效应变的影响。模拟结果表明:油气管道内、外壁面缺陷深度系数保持不变时,随着缺陷长度系数的增加,失效压力呈减小的趋势,等效应变呈增大的趋势;油气管道内、外壁面缺陷长度系数保持不变时,随着缺陷深度系数的增加,失效压力呈减小的趋势,等效应变呈增大的趋势;油气管道内、外壁面缺陷深度系数、缺陷长度系数保持不变时,内腐蚀的等效应变明显大于外腐蚀等效应变,内腐蚀的影响程度大于外腐蚀的影响程度。

The causes and harmfulness of corrosion of oil and gas pipelines are analyzed. Taking No. 60 steel as the research object, according to the characteristics and corrosion mechanism of oil and gas pipelines, the effects of depth coefficient, length coefficient and corrosion location on failure pressure and equivalent strain of oil and gas pipelines are investigated by using ANSYS finite element analysis software. The simulation results show that the failure pressure decreases and the equivalent strain increases with the increase of defect length coefficient when the defect depth coefficient on the inner and outer walls of oil and gas pipelines remains unchanged. When the defect length coefficient on the inner and outer walls of oil and gas pipelines remains unchanged, the failure pressure decreases and the equivalent strain increases with the increase of defect depth coefficient. When the depth coefficient and length coefficient of defects on the inner and outer walls of oil and gas pipelines remain unchanged, the equivalent strain of internal corrosion is obviously larger than that of external corrosion, and the effect of internal corrosion is greater than that of external corrosion.