[Apparently he helped himself to a few drinks at my bar before starting the electrical work. Between his wife and the burns I think he got punished for his stupidity.
/QUOTE]
Count the FAIL on this.
I wonder if this could be used as a manual for how not to go through life...this is the kind of dumb*ss you see in a pickup truck on a logging road in November with a loaded 300 mag inside the cab and a half bottle of crown royal left at 1 in the afternoon.
After the electrian fire, his wife called the next day to ask if there would be any point in sending a bill. "no"
She asked if he could come back for his tools. i said i would leave them on the front steps, but i did not want to see or talk to him.
Apparently he helped himself to a few drinks at my bar before starting the electrical work. Between his wife and the burns I think he got punished for his stupidity.
Before he started the job I told him "Don't smoke in the loading room. I don't want you to blow up my house." I wonder what part of that he did not understand??
You guys are starting to worry me. Makin' it sound like powder fires are super common.
How much of a risk is it, really, if you don't smoke around your reloading bench? Have these fires even spontaneously happened, or been caused by static electricity?
The question was: Can a static spark set off black powder?
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The question of whether a static electric spark can set of black powder has been debated for a while, and I recall hearing of some previous experiments showing that it could not. Since I am involved in the design of a BP breechloader which is to be electrically fired, I resolved to put the matter to test in two experiments.
The Test Setup:
First, I placed a piece of white writing paper on top of a grounded block of metal and placed a small pile of Swiss 4F powder on the paper; I find that this powder ignites near instantaneously in my flinter. I then placed a wire from a ceramic torch igniter 1/4" over the top of the powder. The igniter generates a pulse of electricity of about 10,000 volts, which is about the most static charge that can be built up on a person. I used a combination of flash and time exposure to capture the image, where I sparked the igniter about 10 times during the course of the exposure.
As you can see, the powder did not ignite. I repeated this several times, and the results were the same. I also tried various BP substitutes, and they did not ignite either
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For the second experiment, I used an Oudin coil, which is used for testing glass neon fixtures for leaks. It produces pulses in excess of 40,000 volts and will give you quite a burn (and shock) if you let it hit you
This was impressive! The pile of powder was hit dozens of times, and again, it never ignited. You can see little flashes where the sparks strike; these are caused by vaporization of material from the surface. Although I couldn't get a picture of it, the paper had hundreds of tiny holes punched in it where the sparks burned through.
The next picture shows a similar test set-up, except this time the black powder was ground into dust-like consistency. Again, no ignition, even though the sparks striking the middle of the pile blew powder clear from the areas where they struck.
Unique smokeless powder was also tried, this time with even more sparks - again, no ignition
For those skeptics who might not believe that the sparks actually got near the powder granules, in this experiment, the photo shows sparks passing around and over the individual granules as the spark travels between two electrodes.
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So - Why wouldn't all of the sparks set off the powder?
The answer comes from the fact that black powder, and other carbon-containing propellants, are fair conductors of electricity. When a material conducts well, it takes a lot more current to heat it up. This is why the lamp wire stays cool and the filament in your light bulb gets white hot. The same current passes through both, but because the light filament has a much higher resistance to the passage of electric current, most of the heat ends up there rather than in the wire. In the experiment here, the air has a very high resistance, while the powder conducts fairly well. The passage of the spark heats the air white-hot, but the powder stays cool. A very high-current spark (like lightning!) would, of course, heat everything and cause ignition, but this would take much more current than could be provided from a static-like source.
I am not a fire expert, but I had a 3 week training in puting out fire as I used to be a sailor and actually had to use it twice in real time life threathening situations.
Some notions:
Fire triangle: to burn a fire need 3 things :
1-A combustible (fuel, wood, paper, smokless powder)
2-An oxidizing agent (Oxygen)
3-Heat
A fire spread because the heat form the original fire turn more and more material into combustible. That mean the heat from the fire will turn otherwise inert material into combustible (by heating it and thus turning it in gaz) and thus feed the fire wich will grow bigger and hotter and this will in turn turn more inert material into more combustible... pretty much until someone break this reaction or until there's not much more left of your house than the concrete foundation.
So there are basically 3 ways to put out a fire, wich is taking out anyone of the 3 part of the triangle.
In your case smokeless powder does contain it's own oxidizing agent and it's own combustible so the only thing you can use is the heat element.
So in case of a smokeless powder what you need to do is reduce the heat.
Now about the extinguiser:
They are taylor to the type of fire you can fight, but are not created equals...
They are classified A, B, C, D and K for the type of fire they can effectively fight, let's take out D and K wich are respectively for metal fire (D) and kitchen/fat/oil fire (K)
A: Ordinary solid fire (aka paper, wood, etc..)
B: flamable liquid and gas
C: electrical fire (meaning A, but you can't use water since it would result in electrocution...)
Now most household extinguisher are rated ABC, meaning you can effectively use them against any fire of the A, B or C type. That being said they are usually made of Dry chemical meaning that the basic principle is that on a molecular level it separate the fuel from the oxygen therefore breaking the fire triangle (combustible-Oxidizing agent aka oxygen-heat). Now this is your all-purpose extinguisher, it can do pretty much anything but is definatly better for some than others. In this case the dry chemical is usally better for B and C fire than for A, but it will still fight A fire quite effectivelly.
CO2 extinguisher won't work since the principle is to deprive the fire from oxidizing agent (oxygen) by replacing normal air with CO2 this mean that it won't work in well ventilated area (hello foam extinguisher) and that it certainly won't work with smokeless powder wich is by definition a mix of Combustible and oxidizing agent so depriving it of oxygen is not gonna do anygthing (although it MIGHT help put out subsequent fire, but still non conclusive...)
Water extinguisher (A) is just water with presure, it will trow water on the fire and thus reduce it's temperature. Water extinguisher are also quite easy to operate and recharge. Usually recharging it is just a matter of filling it with water and putting pressure in it with a compressor.
So my (uneducated guess) would be an ABC because it's handy in all sorts of situation and mostly a Water extinguiser, beause althought I never fought a smokless powder fire, it appers to me that heat is the weakest link in this fire and thus water would be the most appropriate response.
Then again I am no specialist.
Etienne
You got it ALMOST right! A fire actually requires a tetrahedron, meaning four. The fire tetrahedron requires a fuel, an oxidizer, a source of ignition AND a chemical reaction to ignite. There are fire suppression gasses that do not stop fuel, oxygen, or heat but rather interfere with the chemical reaction taking place putting out the fire. You will usually find this in server room or hazmat storage releasing systems and it can get quite pricey. I also work in the fire prevention business for the last 8 years as an inspector/technician, did not realise how many others were on the board in a related field.
Very informative thread, thanks for all the input. Definatly going to keep the powder out of the carpet, hook up a hose in the basement and get a halon extinguisher.
Not at this time no, The course material I went over in my CFAA was written in 89, and re-written in 91 and I got my ticket only 7 years ago. LOL although I am up to date on my NBC and ULC standards as well as NFC and local amendments. Its one thing that has kept me in the upper ranks is progressive education and constant upgrading. I've received noticed about Ontario's refresher course though, think it's a good idea but really there should be an exam to challenge for those who didn't say F' it to keeping up to date rather than a compulsory money grab for the course if it's not required.
Very informative thread, thanks for all the input. Definatly going to keep the powder out of the carpet, hook up a hose in the basement and get a halon extinguisher.