Sure. And fires that can be spread by running fuel such as plastics and FCL’s (not to mention BLEVE’s) can set off 40 standard response sprinklers in a minute. I can only imagine the sheer volume of responding sprinklers and skipping that could occur based on how smooth or bumpy the roof/ceiling assembly is if you started wantonly plugging QR control-mode sprinklers into EH fires. (On paper) MDD = .80 ADD = .275
My opinion only, Steve L. From: Sprinklerforum [mailto:[email protected]] On Behalf Of Brad Casterline Sent: Monday, August 08, 2016 5:17 PM To: [email protected] Subject: Re: Paint spray application Shakey ground is all i have ever known Ken. I am no more a professional than you are. THINK MAN! small spaces with fast fires need the fastest acting sprinklers we can muster. I've been in court myself a couple times- neither one over sprinklers though-- please stop being so stodgy! On Aug 8, 2016 7:05 PM, "Parsley Consulting" <[email protected]<mailto:[email protected]>> wrote: I don't know, Brad. You're standing on pretty shaky ground there. The decision to use QR sprinklers in an extra hazard occpuancy is a direct contradiction to 8.4.1.1.2 of NFPA 13, including the 2016 edition, or a similar section number, at least as far back as the 1999 edition. If you install QR sprinklers in a space that is legitimately classed as an extra hazard occupancy, aren't you directly contradicting this particular section of NFPA 13? The handbook provides the following explanatory text on the topic: Extra hazard occupancies are characterized by the probability of fast-developing fires with high heat release rates that have the potential to open a large number of quick-response sprinklers before the sprinklers have time to control the fire. The operation of a large number of sprinklers in a relatively short time period has the potential to overtax the system. For this reason, quick-response sprinklers using the area design method of Chapter 11 are not permitted for the protection of extra hazard occupancies. Additional perspective on this can be found in the discussion of safety margin found in B.2.1. Further, I'm not aware of any QR sprinkler which has been tested and listed by an NRTL for use in protecting extra hazard occupancies. Barring that, to follow the guidance you're suggesting the contractor/designer/installer has to violate both NFPA 13 AND the listing of the sprinkler. I'm not suggesting the gloom and doom drama of "people could die", however it does concern me greatly when I read suggestions to ignore both texts. My thought about that is to make sure your insurance is paid up, and have a good lawyer on retainer. I don't know of a good defense while sitting in the witness chair to a question similar to, "Are you telling me you ignored the applicable law and the manufacturer's recommendations for the installation of that sprinkler?" When I have nightmares I think about having to answer questions similar to that. Ken Wagoner, SET Parsley Consulting 350 West 9th Avenue, Suite 206 Escondido, California 92025 Phone 760-745-6181<tel:760-745-6181> Visit our website<http://www.parsleyconsulting.com/> On 08/08/2016 4:17 PM, Brad Casterline wrote: We're not suppose to use QR in EH either but I say balderdash. That is for big open spaces beacase you could have a bunch of heads going off way over there when the emergency is way over here. Small spaces with fast fires are better off if you use low temp qr and calc every head possible going off _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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