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)
