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Re: Explosion Question
Posted by: PMK140 (IP Logged)
Date: October 31, 2006 10:30AM
As you well know John, there is something for everyone in NFPA 921 - Not bad for a document that some claim is incomplete.
"NFPA 921 -2004
Section 6.17.9.1 Often the association of an ignitable liquid with a particular irregular pattern has been ruled out on the presumption that ignitable liquid vapors will always cause explosions. This is not the case. The expansion of the products of combustion from flammable liquids will cause explosions only if they are sufficiently confined to damage the structure or confining vessel and have the proper fuel–air mixture. (See 5.1.2.2 and 21.8.2.1.) Whether an explosion occurs is a function of the quantity of vaporized fuel present at the time of ignition, the presence of venting openings in the structure, and the strength and construction of the confining structure."
Pat Kennedy, CFEI, CFPS, MIFireE
Fire and Explosion Analyst
Sarasota, Florida
[www.kennedy-fire.com]
"NFPA 921 -2004
Section 6.17.9.1 Often the association of an ignitable liquid with a particular irregular pattern has been ruled out on the presumption that ignitable liquid vapors will always cause explosions. This is not the case. The expansion of the products of combustion from flammable liquids will cause explosions only if they are sufficiently confined to damage the structure or confining vessel and have the proper fuel–air mixture. (See 5.1.2.2 and 21.8.2.1.) Whether an explosion occurs is a function of the quantity of vaporized fuel present at the time of ignition, the presence of venting openings in the structure, and the strength and construction of the confining structure."
Pat Kennedy, CFEI, CFPS, MIFireE
Fire and Explosion Analyst
Sarasota, Florida
[www.kennedy-fire.com]
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