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Video instructions and help with filling out and completing Nfpa 72 2022 pdf
Thanks to curiosity stream for supporting PBS Digital Studios Music whoa what just happened let's watch that again what you're seeing is called flame jetting it requires a perfect storm of circumstances but pouring gasoline or some other fuel from a container can shoot out a 10-foot jet of flame this has happened people have been seriously burned and in some cases they have died so just to be clear we at reactions did not make these videos they were produced by trained professionals from the ATF at their fire research lab in other words we didn't try to make flame shedding happen and neither should you part of the reason flame jetting is so dangerous is that we have certain expectations of how fire normally behaves those expectations do not include shooting out of a small container and engulfing a victim ten feet away the ATF set out to investigate how this happens how do the flames jump like this why doesn't the liquid just burn without jetting and how do we prevent flame jetting from happening the good news is for flame jetting to occur the circumstances have to be exactly right first the bottle needs to have room for air above the fuel fuel evaporates into this space and mixes with the air making a potentially flammable mix of fuel and oxygen second that mix has to be in balance if too much fuel evaporates it crowds out most of the air and the mixture won't burn this is the case with fresh gasoline but older whether gasoline gas that's been sitting around for a long time evaporates much more slowly so it could burn most fuels don't need to be weathered like this alcohols for example evaporate at just the right rate to produce a flammable mix no matter how long they've been sitting around third is the bottle itself the neck of the bottle needs to be wide enough to let the mixture of fuel and oxygen out where it'll be exposed to the flames but it can't be too wide or there will be no vapor build-up and thus no jet so for example this measuring cup not going to jet so here the ATF is pouring a partly empty narrow necked bottle of fuel over a fire two things are going to happen first some of the gasoline vapors come out of the container and air rushes in oxygen enters and the space is primed to burn second the vapour is falling out of the container ignite leading the flames into the bottle then the gases ignite in a good old combustion reaction where hydrocarbons and oxygen becomes co2 and water releasing a ton of energy that drives the temperature up so the gases expand and the pressure in the container increases which forces the remaining liquid to come out as millions of tiny droplets those droplets and the vapors coming off of them create the flame jet all of this happens.