K-17. That’s a little different than I expect. I always thought more like parts of a strip mall building that might end up OH-2.
Best. > On Feb 5, 2020, at 07:58, Kyle.Montgomery via Sprinklerforum > <sprinklerforum@lists.firesprinkler.org> wrote: > > That’s the crux of my question. A literal interpretation could say that the > sprinkler is no longer connected directly to the tee, so you have to include > the equivalent length for the tee in the calculations. But is that really the > intent in this scenario? Is the bushing really creating an impact to the > hydraulics? It seems strange to me that the type of fitting the sprinkler is > connected to (welded outlet, threaded tee, threaded elbow) is of no concern > to the hydraulics, unless the fitting has a bushed outlet. Does a threaded > tee with a bushing really create more friction loss than, say a saddle tee > (mechanical tee)? > > In a lot of cases it doesn’t make much of a difference, but every once in a > while you run into a scenario where you’re upgrading an area that had 1” > outlets to something that needs a large orifice sprinkler (like a K17) and if > you have to add the friction loss for a 1” tee into your calc it really does > have an impact. > > -Kyle M > > From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] > On Behalf Of J H via Sprinklerforum > Sent: Tuesday, February 4, 2020 3:41 PM > To: sprinklerforum@lists.firesprinkler.org > Cc: J H <design.azfire...@gmail.com> > Subject: [EXTERNAL] Re: Shell Spaces and Bushed Outlets > > That doesn't sound legit - I would keep the tee in the calculations. A > bushing isn't really recognized as a fitting per table 23.4.3.1.1 - more like > a transient fitting. > > On Tue, Feb 4, 2020 at 1:22 PM Kyle.Montgomery via Sprinklerforum > <sprinklerforum@lists.firesprinkler.org> wrote: > Esteemed members of the fire sprinkler community, > > NFPA 13 (2016 Edition) section 8.15.20 is basically telling us to provide > bushed 1” outlets for sprinklers in shell spaces, right? > > Section 23.4.4.8.1(9) tells us that friction loss can be excluded for the > fitting directly connected to a sprinkler. > > In your opinion(s), is it the intent of the standard that you have to add the > friction loss for a tee into your hydraulic calculation if using bushings, > since the sprinkler is no longer directly connected to the tee? Or is it > acceptable to consider a tee with a bushing as one fitting for the purpose of > hydraulic calculations. > > Kyle Montgomery > <image001.png> > Aero Automatic Sprinkler Co. > 21605 N. Central Ave. > Phoenix, AZ 85024 > Direct: 623.580.7820 > Cell: 602.763.4736 > kmontgom...@aerofire.com > > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@lists.firesprinkler.org > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@lists.firesprinkler.org > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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