I wish the sway bracing term had been removed as it suggests that old formulaic method that the folks not familiar with actual seismic stuff sometimes think is still valid.
On Thu, Jan 9, 2014 at 8:45 AM, Steve Leyton <[email protected]>wrote: > 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 > -- Ron Greenman Instructor Fire Protection Engineering Technology Bates Technical College 1101 So. Yakima Ave. Tacoma, WA 98405 [email protected] http://www.bates.ctc.edu/fireprotection/ 253.680.7346 253.576.9700 (cell) Member: ASEE, SFPE, ASCET, NFPA, AFSA, NFSA, AFAA, NIBS, WSAFM, WFC, WFSC They are happy men whose natures sort with their vocations. -Francis Bacon, essayist, philosopher, and statesman (1561-1626) A problem well stated is a problem half solved. -Charles F. Kettering, inventor and engineer (1876-1958) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
