stay with your initial assumption. A branch line supplies multiple sprinklers as per the definition. The single sprinkler arm-over, return bends, etc are not branch lines. Go literal.
Roland On Jul 23, 2009, at 6:51 AM, Bobby Gillett wrote: > Agree, > > As a general guideline what is the branch line requirement per > 9.3.6.3? In > my previous example (by definition) this is a branch line, but I > don't feel > it truly needs a restraint. > So what do we use as a general rule? I always went with my opinion > that a > branch line supplies more than one sprinkler, so in my example you > wouldn't > need a restraint but if you had a single sprinkler fed from a pipe > 6'-0 long > or longer coming from a main, common sense would say put one on that > due to > length. That's where I feel they need to put some kind of > clarification as > to pipes feeding single sprinklers - my opinions and common sense do > not > always match others, even fire marshals. But going back and adding or > putting on unnecessary restraints can be costly. > > Bobby Gillett > Sr. Project Manager > Key Fire Protection, Inc. > (731) 424-0130 office (731) 424-9285 fax > (731) 267-4853 cell > [email protected] > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of > [email protected] > Sent: Thursday, July 23, 2009 8:17 AM > To: [email protected] > Subject: RE: Branchline/Restraint of Branchline > > Depends on just how technical you want to get. > > Based on the definition, the branch line serves multiple > sprinklers. The > 9.3.6.3 sounds like it's written more for a branch line where you've > got > uprights or pendant sprinklers connected directly to the branch line. > (exposed construction?) This is supported when looking at the various > illustrations within 13. > > So are we talking about a sprinkler drop or an actual branch line? > > The branch line support is defined in 9.2.3.4.1 (NFPA 13, 2007), > armover is > covered in 9.2.3.5 and sprigs in 9.2.3.7. If you look at sprigs for > instance the restraint requirement applies if it's over 4 ft in > length. > This same criteria could be conversely applied to a drop to a > sprinkler > below. > > It's all up to the AHJ when it starts getting into these gray areas. > > > > > Craig L. Prahl, CET > Fire Protection Specialist > Mechanical Department > CH2MHILL > Lockwood Greene > 1500 International Drive > PO Box 491, Spartanburg, SC 29304-0491 > Direct - 864.599.4102 > Fax - 864.599.8439 > [email protected] > http://www.ch2m.com > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Bobby > Gillett > Sent: Thursday, July 23, 2009 8:46 AM > To: [email protected] > Subject: Branchline/Restraint of Branchline > > A fitter asked us how long a branch line has to be before it > requires end of > the line restraint. A fire marshal told him he could never find an > answer so > they put in place 13ft or longer. > > 9.3.6.3 The end sprinkler on a line shall be restrained against > excessive > vertical and lateral movement. In my opinion, the way this is > written, all > branch lines are to have them, which brought up the next debate; > > > > 3.5.1 Branch Line - The pipes supplying sprinklers, either directly or > through sprigs, drops, return bends, or arm-overs. Would a 1x1'-0 pipe > coming from a main supplying a single sprinkler through a return > bend (or > any configuration) be a branch line, and if so would it require an > end of > the line restraint? The definition says a pipe supplying sprinklers > so this > would qualify because an arm-over is defined as coming from a branch > line. > If this is the case, I think a limit of length is required to be put > on > branch lines requiring end of the line restraint. > > > > Thank You, > > > > Bobby Gillett > > Sr. Project Manager > > Key Fire Protection, Inc. > > (731) 424-0130 office (731) 424-9285 fax > > (731) 267-4853 cell > > <mailto:[email protected]> > [email protected] > > > > > > > > _______________________________________________ > 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) > _______________________________________________ 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)
