If you are required to furnish seismic protection of piping, it may encompass flexibility, clearances, sway bracing of mains and restraint of branches. Sway bracing and branch restraint are not the same thing and, yes, you are required to address both. You may not need a complete complement of both however, as there are certain exceptions. There seems to be a lot of confusion about the sway bracing/restraint distinction and many folks out there are comingling the two, but this is all spelled out sequentially in Chapter 9.
Steve Leyton -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Johnson, Duane (NIH/OD/ORS) [C] Sent: Thursday, January 09, 2014 6:13 AM To: '[email protected]' Subject: RE: Seismic Restraints So do I need to provide restraints on the branchline/main? It already has sway braces... Duane Johnson, PE Program Manager Division of the Fire Marshal (Contractor) Office of Research Services National Institutes of Health 301-496-0487 "Protecting Science - One Sprinkler at a Time" -----Original Message----- From: IPA [mailto:[email protected]] Sent: Wednesday, January 08, 2014 9:05 AM To: [email protected] Subject: Re: Seismic Restraints Why can't the cross main in your case be called a 'branchline' since it fits the description of one per the definition of '13: "The pipes supplying sprinklers, either directly or through sprigs, drops, return bends, or arm-overs." Then the 'armover' could magically become an.... armover. On Wed, Jan 8, 2014 at 5:02 AM, Johnson, Duane (NIH/OD/ORS) [C] < [email protected]> wrote: > Based on the 2013 edition of 13, does a 1" pipe on a cross main > feeding a single sprinkler require a restraint (ie. wire restraint)? > Per 9.3.6.7, Drops and armovers shall not require restraint. Per the > letter of the law, this pipe would be defined as a branchline...right? > And therefore would require a restraint...right? Ok, what about when the 1" pipe is only 10" > long? At this length, a hanger is not required, but what about the > restraint? > > If the 1" pipe was 8' long, I can see the need for a restraint, but > for a short piece of pipe, does a restraint provide added benefit? For > the purpose of restraints, is there a cutoff when the horizontal run > should be reclassified as a branchline in lieu of an armover? At 2'? 6'? 10'? > > Help. > > Duane Johnson, PE > Program Manager > Division of the Fire Marshal (Contractor) Office of Research Services > National Institutes of Health > 301-496-0487 > > "Protecting Science - One Sprinkler at a Time" > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl > er.org > _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler .org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler .org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
