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首页> 外文会议>ASME international pipeline conference 2008 >SOME REMARKS ON THE STRAIN BASED ASSESSMENT OF PIPELINE DENTS
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SOME REMARKS ON THE STRAIN BASED ASSESSMENT OF PIPELINE DENTS

机译：关于基于应力的管道凹陷评估的一些评论

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In order to use the method to estimate strain in dents proposed in Appendix R of ASME B31.8 - Gas Transmission and Distribution Piping Systems - 2003 Edition, in a previous paper the authors used fourth-order B-spline curves to approximate the dent profile in both longitudinal and circumferential directions. This approach proved to be effective to estimate bending strains when the coordinates of the deepest point of the dent are known.rnThis paper studies the impact of the distance between the closest ILI tool sensor and the dent apex on the measured dent depth and on the circumferential bending strain. The results obtained were tested against a set of nonlinear finite element analyses of dented pipelines carried out at PETROBRAS R&D Center. It was concluded that the number of sensors of the ILI tool, and consequently the maximum possible angular distance of the closest sensor in relation to the deepest point of the dent, plays a decisive role on the exactness of the results achieved.rnIt is also mentioned that the equations to estimate the total strain in the inner and outer surface of the pipe wall presented in Appendix R contains a conceptual error and therefore shall be revised.rnFurthermore, longitudinal membrane strains obtained using the formula proposed in Appendix R were compared to finite element results. The comparison showed that directions on how to measure the dent length should be incorporated into the ASME B31.8 Code.
机译：为了使用ASME B31.8-气体传输和分配管道系统-2003版附录R中提出的估计凹痕应变的方法，作者在以前的论文中使用了四阶B样条曲线来近似凹痕轮廓在纵向和圆周方向上。当已知凹痕最深点的坐标时，该方法被证明是有效的估计弯曲应变的方法。rn本文研究了最近的ILI工具传感器与凹痕顶点之间的距离对测得的凹痕深度和周向的影响弯曲应变。针对在PETROBRAS研发中心进行的缩孔管道的一组非线性有限元分析测试了获得的结果。结论是，ILI工具的传感器数量以及因此最接近的传感器相对于凹痕最深点的最大可能角距离，对所获得结果的准确性起着决定性的作用。附录R中估计管壁内外表面总应变的方程包含概念误差，因此应予修改。rn此外，将附录R中提出的公式获得的纵向膜应变与有限元进行了比较结果。比较表明，应将如何测量凹痕长度的说明纳入ASME B31.8规范中。

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