Tony Oxygen does have a front and center role in most combustion. It is not the fuel in the reaction, but the oxidizer. We assume that almost always the oxidizer is present in a fairly constant partial pressures. As a near-constant we usually ignore it as a variable. So we get interested instead with materials that react with oxygen when present in a form that we consider more likely either to ignite, or once ignited to release energy much faster than we would expect compared to materials we are familiar with. We call these materials "flammable".
We use fancy ANSI, CFR, and NFPA definitions, but basically the definition is if it was burning and your great- grandmother and great-grandfather to the 10,000th generation would have said "nice fire, when's dinner", we don't call it "flammable". But if grandpa poured some black goo on, the fire jumped up and burned much of the accumulated wealth of the band, we call that material flammable. In either case if you remove the oxidizer the fire goes out. On the other hand, increase it markedly, and grandpa's nice meat smoking fire jumps up and ruins the dinner. But the key is we usually treat oxygen as a near constant, not a variable. If you want to get real confused, mix oxygen and fluorine, oxygen is considered the fuel, and fluorine the oxidizer. Hypothetically only. Stay away from fluorine. Nasty stuff. Bv -----Original message----- From: "A.P.Silva" <[email protected]> To: [email protected] Sent: Mon, Mar 18, 2013 22:28:21 GMT+00:00 Subject: RE: Sprinkler Tree - Code Path The MSDS they gave me said all material were non-flammable. Even Oxygen was given as non-flammable, but now on second thoughts, I'm wondering if that was an error. Shouldn't liquid oxygen in cylinders be flammable? Anyone knows please let me know. Tony -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Todd Letterman Sent: March 18, 2013 10:58 AM To: [email protected] Subject: RE: Sprinkler Tree - Code Path What is your MSDS tell you, all of the chemicals in your list are either toxic and/or non-flammable, why the Class 1 Div 2? -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of A.P.Silva Sent: Monday, March 18, 2013 9:46 AM To: [email protected] Subject: RE: Sprinkler Tree - Code Path I wasn't told this building had any classification until the questions came from the electrical contractor. The building is a Nitric Acid Plant, and the MSDS they gave me was for Nitrogen, Nitric Oxyde, Nitrogen Dioxyde and Oxygen. They have to sort out whether this building is classified class 1 div.2 as per the electrical code. If it is, the riser still has to be within the building, but the devices will have to comply with the electrical code. Tony -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Cahill, Christopher Sent: March 18, 2013 9:51 AM To: [email protected] Subject: RE: Sprinkler Tree - Code Path Could ya enlighten us why you have a riser in a classified area? Can be done but highly unusual, no? And what's with the removal of brass? Chris Cahill, PE* Senior Fire Protection Engineer, Aviation & Facilities Group Burns & McDonnell 8201 Norman Center Drive Bloomington, MN 55437 Phone: 952.656.3652 Fax: 952.229.2923 [email protected] www.burnsmcd.com Proud to be one of FORTUNE's 100 Best Companies to Work For *Registered in: MN -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of A.P.Silva Sent: Monday, March 18, 2013 10:45 AM To: [email protected] Subject: RE: Sprinkler Tree - Code Path Thanks John and thanks to everyone that replied. I'm enlightened. Tony ----- Original Message ----- From: [email protected] <[email protected]> To: [email protected] <[email protected]> Sent: Sun Mar 17 00:24:00 2013 Subject: Sprinkler Tree I had an electrical contractor commenting on a sprinkler tree, as following: "The tamper switch and low flow switch are not rated for Class 1 Division 2 applications. Also, the brass body valve and gauges should also be replaced". Anyone know what he is talking about? Tony _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20130318/a54f6d99/attachment.html> _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
