首先最重要的一点：如果煤气管道内着火，应立即封闭所有入孔、放散管、采封管，并向管道内通大量蒸汽灭火。
First of all the most important point: if the gas pipeline inner fire, immediately closed all into the hole, radiation tube and sealing pipe, and in general to pipe of steam to extinguish fire.
安全性：闪点较高，可燃，爆炸性：无。着火时，用泡沫、干粉、干冰、蒸汽、水等灭火。
Safety: High flash point, flammable, without explosivity. Foam, dry powder, dry ice, steam and water can be used for extinguishing fire.
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