in order to apply it to larger diameters than 2-1/2, you would be have to jump from say 3 inches for the starter piece (to the first sprinkler) down to 2 inches on the second section of branch line so that the entire portion of BL that would otherwise need a brace is no more than 12 ft. The short overall length was the focus and since it was not expected one would make such a jump in diameter. Is that what you have done?
Roland On May 6, 2009, at 2:35 PM, Bob Knight wrote: > Ron, > > Thanks, I knew that it was for branch lines only, but I wasn't sure > if it > could be extended to a larger size branch line. I don't have a > handbook, > gotta get one one of these days, so it sounds by your posting that the > handbook is stating that it is limiting this exception to 2-1/2". I > just > thought that this had come up once before and that it had been > determined > that this could be extended to larger piping. Guess I was mistaking > since I > couldn't find anything in the archives. > > > > Thanks, > > > > Bob > > > > -----Original Message----- > > From: [email protected] > [mailto:[email protected]] On Behalf Of Ron > Greenman > > Sent: Wednesday, May 06, 2009 3:14 PM > > To: [email protected] > > Subject: Re: 2-1/2" Starter Pieces > > > > Bob, > > > > I'd say that because the 'exception" is so specific (2 1/2 in starter > > pieces less than 12' long) that the intent was also specific and, in > > addition, because they used starter pieces as a criteria they mean > > only for branch lines. I think the handbook commentary for 9.3.5.3.3 > > suggests that it is a gimme for this single set of conditions. > > > > On Wed, May 6, 2009 at 2:02 PM, Bob Knight <[email protected]> > wrote: > >> NFPA 13 9.3.5.3.3 States, "The requirements of 9.3.5.3.1 shall not >> apply > to > >> 2-1/2" starter pieces that do not exceed 12' in length". Is this >> section > >> limiting this to 2-1/2" piping or can it be assumed that starter >> pieces of > >> larger pipe sizes can also be included? > >> > >> Thank you, > >> > >> Bob Knight, CET > >> (208) 318-3057 > >> [email protected] > >> www.firebyknight.com > >> > >> > >> _______________________________________________ > >> Sprinklerforum mailing list > >> http://lists.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 > > at home.... > > > > _______________________________________________ > Sprinklerforum mailing list > http://lists.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 http://lists.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)
