Doesn't this originate with the old pipe schedule design that called for the starter piece of the branch line with 10 heads to be 2-1/2"? An while a std. spacing to the first head would not normally exceed 12'-0" from the main or cross main, more than that would affect the flexibility of the branch line?
Thom McMahon, SET Firetech, Inc. 2560 Copper Ridge Dr P.O. Box 882136 Steamboat Springs, CO 80488 Tel: 970-879-7952 Fax: 970-879-7926 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Roland Huggins Sent: Thursday, May 07, 2009 8:40 AM To: [email protected] Subject: Re: 2-1/2" Starter Pieces 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) _______________________________________________ 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)
