My take on this is that using a class D agent on a vehicle fire where magnesium has already been identified as part of the combustion is a waste. By this time, the vehicle is practically always beyond salvage, thus operations should concentrate on protecting exposures and crew safety. PPE and distance, plus copious water as Todd has mentioned. I just saw the price of a 30lb. class D extinguisher at $688! Personally, I would save it for fires where you must put out the metal. The YouTube video that shows the results of applying water to such fire is quite illustrative for those who haven't seen it: http://www.youtube.com/watch?v=iUmqhIVW3cM
I mentioned vehicle fires only, in the video you post (thanks for sharing!) it's obvious that water is not effective, but it is also a different scenario, with a much larger amount of magnesium - in which case the use of dry agents is justified. To clarify the tactics I suggested earlier, if the reaction to water gets really violent, you can just remove the stream, concentrate on exposures and let it burn.
looking for auto other than VW that had magnesium in engine compartment. I believe it was American made vehicle.
smaller car, discontinued production mid to late 60s
Recall dangerous reaction when water applied.
Often used as a teaching tool in the field with probationary FFers.
keep back and use copious water in addition to regular safety
boots up-gloves-eye shields down-keep your cool
Volvos and VW definately has alot of magnesium. Alot of cars have magnesium in the steering column, as well as in the driver foot area / fire wall....from what i've learned, they key is to definately take advantage of the stream and use foam
Right now the best product on the market for a class "D" fire is FireIce. It does not evaporate so the stream is penetrating to the burning material and full extinguishment is a ground ball. You will get the initial flash but the FireIce will cool the burning metal quickly and bring it below it's ignition temp. With a metal burning at over 5000 degrees, it's nice to get this under control so quickly, wether it's a vehicle, shavings in a dumpster or in a manufacturing plant, this stuff will do the job.
We should be able to recognize burning mag on the inside of a vehicle because the fire will look much brighter than the rest of the car. Extinguish the rest of the car first and flood the burning mag. Too many people will zone in on the mag and not pay attention to what else is happening. If you’re in a parking lot surrounded by other cars or a garage, knock down the rest of the fire and protect the exposures, most of the ones on the driver’s side. Mag engine fires I've been on have usually burned through the hood before we got there and require a whole lot of water. Again, keep your distance; there is no reason to get hurt for a car fire, well if in case some parts get damage through burning so there are any online used parts site are available where we can replace it, I know such a best site http://info.automotix.net/usedautoparts.html , I think it could be helpful for all of us.