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The loss of metal in a pipe due to corrosion usually results in localized thinned areas with various depths and an irregular shape on its surface.In this paper,a number of numerical models of pipes with different size defects are established.The limit loads of these pipes are researched using the nonlinear finite element method.The effect of defect parameters of the local wall-thinning pipes on the limit load is discussed.The results show that limit loads decrease obviously when the depths and lengths of the defect increase.However,when the defect length reaches a certain value,the effect of defect length on limit loads is not significant.These results are compared with the results of the method of API 579.When the defect length is adequately small,the results of FEM are in good agreement with the ones of API 579,but when the defect depth and length is adequately large,the API 579 is not suitable.
The loss of metal in a pipe due to corrosion usually results in localized thinned areas with various depths and an irregular shape on its surface. In this paper, a number of numerical models of pipes with different size defects are established. Limit limit of these pipes are researched using the nonlinear finite element method. the effect of defect parameters of the local wall-thinning pipes on the limit load is discussed. The results show that limit loads decrements when the depths and lengths of the defect increase. However, when the defect length reaches a certain value, the effect of defect length on limit loads is not significant. These results are compared with the results of the method of API 579.When the defect length is adequately small, the results of FEM are in good agreement with the ones of API 579, but when the defect depth and length is adequately large, the API 579 is not suitable.