Rahe, Look to the quote in my post of late last night referring to 13/2007 edition. It's still there. You need to go further into 8.15. Your looking at new build-out stuff for shell structures (typically strip malls) whereein the tenant layouts will not be known at time of construction but it is known there will be modifications. Here's the reference from 2007 again:
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. On Sat, Mar 27, 2010 at 8:56 AM, Jay Jay Blocker <[email protected]> wrote: > Would this same idea be considered acceptable if a 1/.2 inch nipple was used > to go from the attic (1x1x1/2) through a celing with a 1/2 inch by 4 inch > nipple that connected to another 1x1x1/2 t that supplied two uprights? Just > wandering since it is in a system less than a year old. > > J. Blocker > EFPS > (303) 353-9712 > > > > > ________________________________ > From: tom poisal <[email protected]> > To: [email protected] > Sent: Sat, March 27, 2010 9:22:47 AM > Subject: Re: 1/2 inch nipple in sprinkler outlet > > Hey Guy's, really this is an approved method for upgrading an existing > system, wherein SSU were to be replaced with SSP heads, however as it > invariably goes, a space is rented, ceiling goes up and overhead system > needs to be converted; gotta calc it, ref nodes at each change in pipe > size.............as to Seismic Zones, I believe it does not pertain, sorry > Ron; but if it is proven by hydraulic calculations (existing system upgrade > talkin here) then I believe the above situation is within code. > > Thomas Poisal, CET > > > On Fri, Mar 26, 2010 at 8:25 PM, <[email protected]> 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 >> [email protected] >> http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum >> >> For Technical Assistance, send an email to: [email protected] >> >> To Unsubscribe, send an email >> to:[email protected]<to%[email protected]> >> (Put the word unsubscribe in the subject field) >> > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > > > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (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 [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
