Wrong on both counts Bud. And now you made me get out my book and my glasses. In the 2007 edition apparently nothing has changed. The option is available only for pipe schedule systems only and is found in 2007:8.15.19.4. It's 8.15.19.4.3 that allows the nipples less than 1". "When it is necessary to pipe two [sic] ( I presume this is a typo and not a restriction to only two heads-my comment) new ceiling sprinklers from an existing outlet in an overhead system, the use of a nipple not exceeding 4 in. (100mm) in length and of the same pipe thread size as the existing outlet shall be permitted, provided that a hydraulic calculation verifies that the design flow rate will be achieved...." The arrangement is shown in figure 8.15.19.4.2 and clearly shows the nipple being of a lesser diameter than the drop and being attached to a labeled reducing elbow. 8.15.19.4.4 disallows using the arrangement in earthquake country. Now because you made me get out my book and type text I need some of your products donated to my class so the students can see the PEX system.
On Fri, Mar 26, 2010 at 7:10 PM, Mike Cabral <mcab...@charter.net> wrote: > The nipple as I remember had to be Sch 80 and I thought it was a close or > space nipple max. > > Sent on the Sprint® Now Network from my BlackBerry® > > -----Original Message----- > From: Ron Greenman <rongreen...@gmail.com> > Date: Fri, 26 Mar 2010 18:39:15 > To: <sprinklerforum@firesprinkler.org> > Subject: Re: 1/2 inch nipple in sprinkler outlet > > Rahe, > > I don't have my archival copies of 13 handy but I believe your > statement is only half right. Your reference is correct for your > second paragraph. The allowance for the 1/2 nipple not to exceed 4" in > length is elsewhere and used to have a drawing showing the arrangement > of a 1/2" Tee outlet with a 1/2" nipple transitioning to a 1/2" x 1" > Ell, a 1" short nipple, 1" Ell and finally the drop. This arrangement > has never been acceptable in a Seismic Zone. > > On Fri, Mar 26, 2010 at 5:25 PM, <rahe.lof...@gsa.gov> wrote: >> Here is one that relies on an interpretation of the code from its literal >> verbiage. NFPA 13: 8.15.19.5 states "When hydraulically designed systems >> are revamped, >> any existing bushing shall be removed and a nipple not exceeding 4 in. (100 >> mm) in length shall be permitted to be installed in the branch line >> fitting." This has historically been taken to mean that a 4 inch by 1/2 >> inch nipple can be installed in an existing 1 X ! X 1/2 tee to provide an >> armover for a pendent sprinkler to a ceiling below. >> >> However, this is not what the code states. NFPA 13 is relating to a >> bushing that was installed in an unfinished space. In fact, it does not >> state what size nipple is acceptable except that it cannot be less than 1 >> inch if it is in an earthquake zone. As I read it, you cannot just remove >> an upright sprinkler and install a 1/2 inch nipple connected to a 1/2 to 1 >> inch increaser and drop it to the ceiling below. What is the consensus >> and/or did the standard change sometime ago? >> >> Thank You >> >> Rahe Loftin, P.E. >> Region 7 - GSA >> Office - 817-978-7299 >> Fax - 817-978-8644 >> Cell - 817-371-3102 >> >>_______________________________________________ >> Sprinklerforum mailing list >> Sprinklerforum@firesprinkler.org >> http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum >> >> For Technical Assistance, send an email to: supp...@firesprinkler.org >> >> To Unsubscribe, send an email to:sprinklerforum-requ...@firesprinkler.org >> (Put the word unsubscribe in the subject field) >> > > > > -- > Ron Greenman > Instructor > Fire Protection Engineering > Bates Technical College > Tacoma, WA > > Member: > SFPE, ASCET, NFPA, AFSA, NFSA AFAA, NIBS, WSAFM, WFC > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@firesprinkler.org > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: supp...@firesprinkler.org > > To Unsubscribe, send an email to:sprinklerforum-requ...@firesprinkler.org > (Put the word unsubscribe in the subject field) > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@firesprinkler.org > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: supp...@firesprinkler.org > > To Unsubscribe, send an email to:sprinklerforum-requ...@firesprinkler.org > (Put the word unsubscribe in the subject field) > -- Ron Greenman Instructor Fire Protection Engineering Bates Technical College Tacoma, WA Member: SFPE, ASCET, NFPA, AFSA, NFSA AFAA, NIBS, WSAFM, WFC _______________________________________________ Sprinklerforum mailing list Sprinklerforum@firesprinkler.org http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: supp...@firesprinkler.org To Unsubscribe, send an email to:sprinklerforum-requ...@firesprinkler.org (Put the word unsubscribe in the subject field)
