I think that since the AHJ is imposing an added standard of care above the prescriptive code that it his responsibility to also provide a design criterion. On the other hand you said it was voluntarily being desired by the owner. I don't see PE after your name so you are legally not qualified to invent your own design criterion. This then must be a negotiation between you (the Pro from Dover), the AHJ (Blesser of All Things), and the owner (Mr. Moneybags). The solution may be just leaving them off. Another solution is for the owner to start his own manufacturing company, then design and have approved his own sprinklers along with the design criterion. There's probably a solution somewhere in between but nobody here can dictate it.
On Tue, Sep 22, 2015 at 7:53 AM, Travis Mack <[email protected]> wrote: > We have AHJs impose sprinklers at outside patios often. We have always > done QR sprinklers in those instances and calculate at 0.05 density which > leads to just 7 psi for 2 sprinklers. Never had an issue with it. > > Travis Mack, SET > MFP Design, LLC > "Follow" us on Facebook: > https://www.facebook.com/pages/MFP-Design-LLC/92218417692 > Send large files to MFP Design via: > https://www.hightail.com/u/MFPDesign > > Sent from my iPhone > > > On Sep 22, 2015, at 7:39 AM, Sean Lockyer <[email protected]> > wrote: > > > > A question for everyone here: I have is a single family residence (NFPA > 13D, 2010 Edition) in which the owner is voluntarily wanting to protect the > exterior patio and lanai areas-all unheated areas. At the present, only > Tyco makes a residential dry pendent sprinkler; however, the owner also > wants all of the heads to be concealed and the only residential dry pendent > is semi-recessed. As such, the owner may then dictate that he wants > non-residential dry pendents that have a flat concealed plate. > > > > However, the local AHJ will (most likely based upon my prior experience) > require a proof calc of these areas in order to quantify the pipe sizing to > feed the non-residential standard heads. At that point it becomes a > problem. Per section 13D, 2010 Edition, 8.1.3.2 non-residential sprinklers > are to be installed per NFPA 13, not 13D, which would lend credence to a > .10 density/900 sq. ft. design area (after reduction), etc. and for a > simple 13D simple coming off of a 1" meter it won't wont (I already tried > the calcs, not even close). > > > > HOWEVER, the appendix (section A.8.6.4) states that a simple (2) head > design area using residential -or- quick response sprinklers may be used in > instances where the local AHJ requires the attic to be sprinkled. While > this is just the garage it kinda is in the same ballpark, intent-wise. > > > > In addition, section 8.1.2 states that the design area is to consist of > (2) sprinklers in the most demanding compartment although this appears to > be intended to apply to residential heads only, and not non-residential > sprinklers. > > > > I would love to use the Tyco, residential pendent but since Tyco is the > only manufacturer that makes a residential dry head they are getting their > money's worth and even if the owner is ok with semi-rec heads out in these > areas he may not be ok with the potential cost. > > > > I hate to admit that a "little" house is kicking my backside but this is > a bit of a grey area. > > > > What does everyone think ? I would like to say I can figure this out on > my own but I need to humble myself a bit and reach out into the community > since I have been eating too much humble pie lately, lol. > > > > > > Sean Lockyer > > Project Designer 4617 > Parkbreeze Court > > Cell 386-279-1197 Orlando, > Florida 32808 > > [email protected] Phone: > 407-816-9101 > > www.AITLifeSafety.com Fax: > 407-816-9104 > > > > > > _______________________________________________ > > 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 > -- Ron Greenman Instructor Fire Protection Engineering Technology Bates Technical College 1101 So. Yakima Ave. Tacoma, WA 98405 [email protected] http://www.bates.ctc.edu/fireprotection/ 253.680.7346 253.576.9700 (cell) Member: ASEE, SFPE, ASCET, NFPA, AFSA, NFSA, AFAA, NIBS, WSAFM, WFC, WFSC They are happy men whose natures sort with their vocations. -Francis Bacon, essayist, philosopher, and statesman (1561-1626) A problem well stated is a problem half solved. -Charles F. Kettering, inventor and engineer (1876-1958) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
