Structural strength failure mechanism of X52 natural gas pipeline with corrosion defects under hydrogen-blended environment
[Objective]This study aims to explore the structural strength deterioration mechanism of pipe-lines with corrosion defects in hydrogen-blended environments.[Methods]Based on the experimental data,an analysis is made of the load bearing performance of X52 steel under different levels of hydrogen blending,and the structural strength failure mechanism of an X52 hydrogen-blended natural gas pipeline under different corrosion defects is described using the nonlinear finite element method.[Results]When the hydrogen blend level increases to 50.0%,under a combined load,the pipeline reaches minimum displacement failure at 2.58 mm,and the structural toughness deteriorates to a greater degree;at a hydrogen blend level of 25.0%,the defect depth is greater and the degree of structural failure more serious;comparing square and circular defects,the maximum stress of the square defects is higher than that of the circular defects.[Conclusions]The ma-terial property-based defective pipeline model can realize the assessment of the structural bearing capacity de-terioration of natural gas pipelines under different hydrogen-blending conditions,providing engineering sug-gestions for the design and health monitoring of new energy pipelines.
hydrogen energyhydrogen-blended natural gas pipelinecorrosion defectnonlinear finite ele-ment methodsdegree of deterioration
国家科技期刊平台
NSTL
万方数据
