Anatomy of fire

[Ice Czar]

sorry, the perfect example a little closer to home just occurred to me

an acetylene generator

Acetylene pressure at the generator, in distribution lines and at the point of use
must not exceed 15 psi gauge pressure due to the possibility of an explosion

auto ignition via the Adiabatic process can occur (like a fire piston) at pressure above that

you might also find Adiabatic flame temperature another interesting portal to combustion thermodynamics

[irnsrgn]

I maybe shouldn't bring this up, but.

I got this information from a rather round about source that I trust. In other parts of the world, they use up to 30 lbs of acetylene, only in the US are acetylene gauges red past the 15 lb mark.

[Jerry W.]

Fire can be extinguished by the removal of heat, fuel or oxygen. It can also be extinguished by interrupting the exchange of free radicals. This is how baking soda extinguishes a grease fire or a standard ABC fire extinguisher.

[keykeeper]

Ice Czar,

Not trying to attack your posts, as the advanced information on combustion and the like are helpful to the original thrust of the thread. Just consider that for link purposes, wikipedia can be changed by anyone, thus, there may some inaccuracies in the definitions. Links to a more solid platform of definitions may be in order.

[Glenn]

IForgeIron has a wikipedia of blacksmithing and metalworking as part of the site. Any member can add to the resource. Usually it is better to make the addition of more information below the existing post. Original material please, as YOU are a blacksmith and should be able to define the term in your own words. Besides, we understand blacksmith to blacksmith much better than some high tech explanation that we need to look words to figure out what is being said.

[RegionalChaos]

Glenn, I noticed the wiki appear a while back, and haven't seen much happening with it yet. One thing I thought it might work well for would be rough drafts of blue prints. In case people don't have a good place of their own to work on them. Just thought I might throw that out there. My apologies for thread hi-jacking..

[matt87]

Every so often I amble over to the Wiki and do my best to add a new article or improve an existing one. It's a useful resource IMO, or at least it will be when there are more articles and there is more depth.

[keykeeper]

Just to clear up what I posted, the wikipedia links are for the wiki available on the web and accessible to anyone that wants to edit or delete information. I have heard nasty rumors that a lot of misinformation is spread using this medium.

Perhaps links from Webster's dictionary, or a more accredited site is what I was trying to get at. Sorry for any confusion this may cause.

On another note, I wish more people would post on the wiki available here at IFI. Will be a great resource for anyone interested in blacksmithing!! (or those just learning!)

[Ice Czar]

generally speaking the shenanigans possible at wikipedia occur over social issues or people, the hard sciences are generally reliable. If you have any doubt you can veiw a comparative history of an article. The ability for someone to make corrections, additions, or a new article is the great strength of any wiki, but verifying information is easy when you have a lexicon of specific search queries. There are also generally external links, cross references with wiki articles and a self supporting network of logic between related articles (at least in the sciences )

IMO traditional "reference" materials are an endangered species, consider

Wikipedia - Wikipedia, the free encyclopedia

As of November 2007, Wikipedia had approximately 9.1 million articles in 253 languages, comprising a combined total of over 1.41 billion words for all Wikipedias. The English Wikipedia edition passed the 2,000,000 article mark on September 9, 2007, and as of December 17 it had over 2,131,000 articles consisting of over 927,000,000 words.[1] Wikipedia's articles have been written collaboratively by volunteers around the world and the vast majority of them can be edited by anyone with access to the Internet. Having steadily risen in popularity since its inception,[3] it currently ranks among the top ten most-visited websites worldwide.[7]

Critics have questioned Wikipedia's reliability and accuracy, citing its open nature.[8] The criticism is centered on its susceptibility to vandalism, such as the insertion of profanities or random letters into articles, and the addition of false or unverified information;[9] uneven quality, systemic bias and inconsistencies;[10] and for favoring consensus over credentials in its editorial process.[11] Scholarly work suggests that vandalism is generally short-lived.[12][13]

anything on the web needs verification, and the application of critical thinking
but odds are the thermodynamics section of wikpedia is "safe"

as far as the PSI ratings that wasnt from wikipedia, I grabbed it off a state reg (Penn?) its also lower in some countries. Pressure is just one variable, ambient temperature would be another.

Acetylene generators are also slightly different from Acetylene storage as its an ongoing chemical reaction of calcium carbide and H2O
whereas storage employs its being dissolved into acetone isolating it from O2 forestalling decomposition, the acetone in turn is within a matrix of porous material which limits the free volume of the tank controlling and cooling any thermal decomposition

http://www.depweb.state.pa.us/deepmi...yacetylene.ppt

explosive range is 3.0 to 93%
needs only 10% oxygen to ignite
it is an unstable gas, will violently decompose when in a pure state above 15 psi
Auto-ignition temperature is 763-825 F, this means acetylene reaches 30 psi in a free state. it can explode by itself without a spark or flame being present

[keykeeper]

I stand corrected, and humbled. Thanks for clearing it up. Still don't trust wikipedia, though.