随着埋地燃气管网服役时间的延长以及服役环境的日益复杂，埋地燃气管道外腐蚀泄漏的风险逐渐加大，外腐蚀失效事故频繁发生。基于北京燃气2014-2017年间外腐蚀泄漏数据的统计结果，分析了泄漏频次随管道服役时间的变化规律以及管道外防腐层类型、压力等级及阴极保护等因素对管道泄漏情况的影响。结果表明：影响北京燃气外腐蚀泄漏的关键因素为防腐蚀层类型、服役时间、阴极保护状态。

With the extension of the service time of buried gas pipeline networks and the increasingly complex service environment, the risk of external corrosion and leakage of buried gas pipelines gradually increases, and external corrosion failure accidents occur frequently. Based on the statistical results of Beijing Gas's external corrosion leakage data from 2014 to 2017, the variation law of leakage frequency with the service time of the pipelines and the influence of external corrosion protection layer type, pressure level and cathodic protection on the pipeline leakage were analyzed. The results show that the key factors affecting the external corrosion leakage of Beijing gas pipelines were the type of anti-corrosion layer, the service time of the pipeline, and cathodic protection status.