this post was submitted on 30 Aug 2024
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I mean, it's funny and ironic in that Alanis Morrisette kind of way. But it actually makes sense.
Fire hydrants are heavily engineered hunks of metal. Metal getting rammed into at speed is a great way to generate sparks. And lithium fires are scary as hell. There is areason ANYONE futzing around with lipos should have a bucket of sand handy and why, as the article states, first responders need to handle these specially.
It is a similar principle as to how you don't pour water on a grease fire.
Ok a few things:
Batteries don’t need “a few sparks” to catch fire. They will generate plenty of heat if punctured and self-ignite.
You don’t pour water on a grease fire because grease floats and it will spill out of your pot and catch the rest of your kitchen on fire. Also the water will boil and splatter oil everywhere.
Also pouring water on a battery fire is the preferred way to put it out. Many of the chemicals in the battery will release oxygen when heated, so the best way to put it out is to cool it down as much as possible by dousing it with a shitload of water. It isn’t always possible to apply enough water to the core of the fire which is why they are hard to put out. Sand won’t do anything because the fire is self-oxidizing.
Yes lithium metal reacts with water, but that’s not what makes batteries hard to put out.
I expect you know as you were mainly talking about batteries (on this post about batteries) - but grease fires are not quite dangerous just because grease floats and adding water causes it to spill fire - when you introduce the water it does sink, but then it superheats to vapour, rapidly expanding and almost erupts the oil, chucking a poor man's napalm round everything in the vicinity
It doesn't have to even be on fire, if the oil is >100 degrees and there's enough of it to superheat adding water will do the same thing (minus the flames) - a melted face is better than a melted face and a house fire, but neither are recommended