摘要
Abstract
Risk factors for urban natural gas pipeline leakage include pipeline corrosion and perforation,ex-cavation damage,pipeline material or welding quality,failure of other components,natural external force dam-age,operational errors,other external force damage,and other reasons.Based on the 2022 statistical data from the United States,the leakage probability associ-ated with each risk factor is calculated.Gas pipelines are categorized into four material types:steel pipes,PE pipes,cast iron pipes,and others.Based on the hazard severity scores of each risk factor for different pipe ma-terials,the hazard severity of natural gas pipeline risk factors is calculated.The hazard severity of risk factors for hydrogen-blended natural gas pipelines will in-crease by a certain value on the basis of that for natural gas pipelines.According to the increment of hazard se-verity of each risk factor under different hydrogen blending ratios,the hazard severity of each risk factor for hydrogen-blended natural gas pipelines can be cal-culated,and then the leakage risk can be derived.When there is no hydrogen blending,the main risk fac-tor for gas leakage is pipeline corrosion and perfora-tion.When the hydrogen blending ratio is greater than 0 and less than or equal to 50％,excavation damage poses the greatest risk of gas leakage,followed by pipe-line corrosion and perforation.When the hydrogen blending ratio is greater than 50％,pipeline corrosion and perforation becomes the primary risk factor for gas leakage,followed by excavation damage.As the hydro-gen blending ratio increases,the leakage risks caused by various risk factors rise to varying degrees,among which the risk increment caused by pipeline corrosion and perforation is the largest.Therefore,particular at-tention should be given to pipeline corrosion and perfo-ration issues in urban hydrogen-blended natural gas pipelines.关键词
城市燃气管道/掺氢天然气/泄漏风险因素/泄漏风险评估Key words
urban gas pipeline/hydrogen-blended natu-ral gas/leakage risk factors/leakage risk assessment分类
土木建筑
