Got a code section that connects a length of a BL to a restraint or the inverse of what you said, that if it needs a hanger then it needs restraint? I got one that says it doesn't, 9.3.6.7 Drops and armovers shall not require restraint. 3.5.3 Arm-Over. A horizontal pipe that extends from the branch line to a single sprinkler or a sprinkler above and below a ceiling. I just find it odd I can have a 2" pipe 100' long serving one head and it doesn't need anything but regular old gravity hangers. Or I can't find anything to challenge 9.3.6.7. My case I have a bunch of 3-8' 1" legit armovers. Contractor didn't install restraint and I think he's right technically.
Chris Cahill, PE* Senior Fire Protection Engineer Burns & McDonnell 8201 Norman Center Drive Bloomington, MN 55437 Phone: 952.656.3652 Fax: 952.229.2923 [email protected] www.burnsmcd.com Proud to be one of FORTUNE's 100 Best Companies to Work For *Registered in: MN -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of rongreenman . Sent: Sunday, October 20, 2013 2:19 PM To: [email protected] Subject: Re: NFPA 13 '10 9.3.6 BL Restraint Restraint is to avoid upward thrust and side to side thrust, whipping for Devo fans, at the end of a branch line. If an armover does not need a hanger it wouldn't need restraint On Sun, Oct 20, 2013 at 7:50 AM, Cahill, Christopher <[email protected]>wrote: > Two questions. > > Is there a length of an armover that needs restraint? Imagine a 12' > armover that only feeds one head. > > Can restraint be connected to something other than structure, like a > concrete floor above? > > Chris Cahill, PE* > Senior Fire Protection Engineer > Burns & McDonnell > 8201 Norman Center Drive > Bloomington, MN 55437 > Phone: 952.656.3652 > Fax: 952.229.2923 > [email protected]<mailto:[email protected]> > www.burnsmcd.com<http://www.burnsmcd.com/> > > Proud to be one of FORTUNE's 100 Best Companies to Work For > *Registered in: MN > > > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl > er.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) _______________________________________________ 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
