[本刊讯]（据《危险货物运输》杂志报道）今年3月5日西安市发生的特大液化石油气爆燃事故原因查明。经专家调查分析，是液化气管理所的回号400ms球罐下部的排污阀上部法兰密封局部失效，造成液化石油气大量泄漏，浓度达到爆炸极限，在球罐以北58．7m处配电室遇火花，引起爆燃， According to the report of Dangerous Goods Transport magazine, the cause of the accidental explosion of extra-large liquefied petroleum gas in Xi’an on March 5 this year was identified. The expert investigation and analysis is the liquefied gas management of the back number 400ms tank bottom of the sewage valve upper flange seal partial failure, resulting in a large number of liquefied petroleum gas leaks, the concentration reached the explosion limit of 58.7m north of the tank at the distribution Room in case of sparks, causing deflagration,