부식배관의 파손확률 모델

This paper presents the effect of external corrosion in pipeline on failure predicition by using a failure probability model. The predicted failure assessments for the simulated corrosion defects discovered in corroded pipeline is compared with those from ANSI/ASME B31G code and a modified B31G method. A failure pressure model based on fracture mechanics is adopted for the assessment of pipeline failure pressure and linear idealisation of the long term corrosion growth rate is carred out. The effects of random variables on defect depth, pipe diameter, defect length, fluid pressure, corrosion rate, material yield stress and pipe thickness are systematically studied by using a failure probability model for the corrosion pipeline.