Show me a spray booth with forty sprinklers Steve On Aug 8, 2016 7:36 PM, "Steve Leyton" <[email protected]> wrote:
> 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]. > org] *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]> > 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 <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] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler. > org > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler. > org > >
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