燃气供应大大方便了城市人们的生活,城市燃气有管道输送燃气和罐装液化石油气。而燃气的易燃易爆的属性,也使它成为城市的一个危险源,用得不好或管得不好极易出现危险事故。笔者经常在中小城市里看到一种极其危险的现象,那就是流动销售燃气的小商贩,在居民区域或城市商业网点流动销售和现场充装液化石油气,而这些地方往往是城市的人员密集聚集区, Gas supply greatly facilitates the lives of urban people, urban gas pipeline gas and canned liquefied petroleum gas. The flammable and explosive nature of gas also makes it a dangerous source of danger to the city, poorly used or poorly managed. I often see an extremely dangerous phenomenon in small and medium-sized cities where small traders selling gas are moving sales and liquefied on-site in residential areas or urban commercial outlets, often densely populated by cities Enclave,