How about stems at 7-10 Ron? p.s. I'm working on an X-word puzzle... 6 letters starts with d ends with e... a little help? p.s.s. you were right a couple years ago when you told me if I'm looking for a little love I might be looking in the wrong place. I wish I was Larry, or Steve L right about now. On Apr 28, 2016 5:14 PM, "rongreenman ." <[email protected]> wrote:
> I hate to state the obvious, nor sound like a d....e, but it's because it > os the rule. It's the same if I have a duct that is 48" wide I need to > place sprinklers under the duct but i can have multiple ducts 47" wide with > a gap 1" wide between them, and I can have then all across the room and > don't have to sprinkler under them. So at some point you have to look at > common practice and you'd never see my scenario. What about yours? Do you > regularly run into 2' 11" and 3' 1" stems? > > On Thu, Apr 28, 2016 at 3:02 PM, Larry Keeping <[email protected]> > wrote: > > > It may be of help if you reference the 2016 edition of NFPA 13. > > > > There, in Section 8.6.4.1.2(5) the 3 ft limit has been deleted. > > > > The Committee Statement for that revision was that concrete tees are > > capable of withstanding the heat long enough for sprinklers to activate > > even when the tees are closer than 3 feet on centers. > > > > Larry Keeping > > > > -----Original Message----- > > From: Sprinklerforum [mailto: > > [email protected]] On Behalf Of > > [email protected] > > Sent: April-28-16 5:35 PM > > To: [email protected] > > Subject: NFPA 13 (2013) 8.6.4.1.2(5) - why the 3ft minimum? > > > > Forum, > > > > We have concrete tee construction. Bottom of stems measured from the > > ceiling is 26" down. Centerline of stems are spaced apart in an every > > other fashion of 7', 2'8", 7', 2'8", etc. Ideally we would like to use > > NFPA 13 (2013) 8.6.4.1.2(5) to protect the area so we don't have to add > > additional sprinklers/piping. However it states this is only applicable > > for 3ft to 7.5ft stem spacing. Can someone tell me the purpose behind > the > > 3ft minimum threshold? Even though we have some 2'8" sections, do you > > believe the intent of this code was for my situation? Or do you believe > > the intent is for concrete tee construction where every stem is 3ft or > > less? I can see people interpreting this passage either way as all stems > > are spaced away from another stem more than 3ft, yet all stems are spaced > > away from another stem less than 3ft. > > > > To me, it seems ridiculous that I can have stems with any depth (let's > say > > 10ft) and spaced 3'1" apart and the deflector can be located 1" below > the > > bottom of the stem (10'1") and branchlines can be spaced 15ft apart. Yet > > if the same depth stems are spaced 2'11" apart the deflector can't be > lower > > than 22" below the ceiling and because they are now obstructed, they have > > to be in every pocket. > > > > I appreciate anyone's opinion on my situation and/or knowledge/history of > > this codes development. > > > > Note: As I allude to, I know there are other ways to design this system > > utilizing 22" and beam rule. I am more looking for the "Why's" or the > "You > > missed this blurb" that agrees with your stance . > > > > Thanks, > > Sean VG > > > > > > > > > > > > _______________________________________________ > > 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 > > 4110 Olson Dr., NW > Gig Harbor, WA 98335 > > [email protected] > > 253.576.9700 > > 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 > _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
