(v18preprint10)Failure Pressure Analysis of Corroded Pipelines with Spherical Corrosion Pit

摘要

In this paper, failure pressures of corroded pipeline with single-point and double-point sphericalcorrosion pits were investigated by finite element method. Effects of internal pressure, radius, depth andspacing of corrosion pits on failure pressure of corroded pipeline were discussed. The results show that failurepressure of corroded pipeline with spherical corrosion pit obtained by FEM is bigger than by ASME B31G. Themaximum von Mises stress appears on the bottom of the single-point corrosion pit along pipeline axis direction.While the maximum stress appears on the inside of the double-point corrosion pit first. The minimum stressappears on the ends along ring direction of the pipeline. Failure pressure of corroded pipeline with double-pointcorrosion pit is smaller than the single-point. Failure pressure of the corroded pipeline decreases with corrosionpit depth increases, but increases with the increasing of the spacing and wall thickness. With the increasing ofthe radius of corrosion pit, failure pressure of corroded pipeline with single-point corrosion pit decreases, whileit increases for double-point corrosion pit.