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在瓦斯矿井的独头巷道中最易发生瓦斯局部积聚。在采用炮掘的情况下,由于放炮后工作面无人,不能立即发现沼气的燃烧,火灾就可能蔓延。据苏联统计,独头巷道中有近70％的火灾是由放炮时工作面附近的沼气被点燃而引起的。 为了防止这样的火灾,全苏“呼吸器”生产联合公司研制成功了Oпщ20—A型自动干粉灭火器。灭火器容积为20升,内装批量生产的п—2Aп或п—4Aп号灭火干粉。灭火器壳内装有15千克干粉和压缩空气,其内还有一气瓶,装有备用压气,它由一打有孔的空心管组成,管上的孔用逆止阀封闭。在灭火器的前盖上装有带易熔阀的起动装置,后盖上为压缩空气罐。
Local gas accumulation is most likely to occur in single-headed tunnels in gas mines. In the case of using gun digging, the fire could spread due to the unmanned face after blasting, which could not be immediately detected by the burning of biogas. According to Soviet statistics, nearly 70% of the fires in single-headed tunnels were caused by the burning of biogas near the working face during shooting. In order to prevent such a fire, all Su “respirator” production joint company successfully developed Oпщ20-A automatic dry powder fire extinguishers. Fire extinguisher volume of 20 liters, built-in mass production of п-2Aп or п-4Aп extinguishing powder. The fire extinguisher shell contains 15 kilograms of dry powder and compressed air, and a gas cylinder with a backup gas, consisting of a dozen of perforated hollow tubes closed by a check valve. The front cover of the fire extinguisher is equipped with a starting device with a fusible valve and the back cover is a compressed air tank.