At present,there are few researches on the risk assessment of urban gas pipeline leakage in China.However,with the improvement of urban infrastructure,especially the gradual construction of natural gas pipelines,the risk of urban gas leakage has increased.Therefore,the risk assessment of urban gas transmission and distribution network system is an essential basis for future gas pipeline maintenance and renewal.In view of the existing risks of urban gas pipeline system,this paper puts forward a complete risk assessment method.Based on the method of combining fault tree with event tree to identify the risk of urban gas pipeline system,the model and process of risk assessment of urban gas pipeline system and system-based risk assessment are constructed,and the effectiveness of risk assessment is verified by example evaluation.
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