在城镇燃气系统中,一旦发生泄漏事故极易发展为火灾爆炸、群死群伤等特大灾难性事故。本文基于事故树分析法,通过建立燃气系统泄漏事故树,并对事故树进行定性和定量分析,计算相应的重要度和事故概率,找出事故发生的主要原因,为安全监控对策提供可靠依据,有效地预测与预防燃气泄漏事故的发生,杜绝城镇燃气系统安全隐患。 In the urban gas system, once a spill happens, it can easily develop into catastrophic catastrophes such as fire and explosion, mass extinction. In this paper, based on the fault tree analysis method, the gas leakage accident tree is established, and the fault tree is qualitatively and quantitatively analyzed, the corresponding importance and accident probability are calculated, the main causes of the accident are found out, the reliable basis for safety monitoring and control is provided, Effectively predict and prevent the occurrence of gas leakage accidents and eliminate the hidden dangers of the gas system in cities and towns.