内圧を受ける減肉配管の変形特性に着目した減肉形状推定手法
Method to Estimate Pipe Wall Thinning ConfigurationBased on Its Deformation under Internal Pressure
著者:
飯井 俊行 Toshiyuki MESHII
発刊日:
公開日:
Beam on an Elastic FoundationDefect LengthShell TheoryWall ThicknessWall-Thinning
概要
In this paper, we proposed a method to estimate the configuration of wall thinning defects in pipes due to, for example, flow accelerated corrosion (FAC). The method requires measurement of circumferenti al stress distribution and internal pressure. The key issue is that the local circumferential stress and the corresponding local wall thickness are not necessary in a simple relationship, as taught in th e Strength of Material course. We first point out that not only thickness but also the length of thinned area affects the local circumferential stress. Then we derived a closed form equation to evaluate the stress considering the effect of the length of thinned area. Finally, we proposed a method to estimate the thickness and length of the wall-thinned area by using the closed form equation we derived.
