I’ve stayed out of this one because folks way smarter than me are already engaged.
Seems to me that if you can satisfy the metrics Roland alludes to in his preceding post, and get the design signed off by a structural engineer, there’s no reason it won’t work … at least in theory. But my experience (as a resident of a seismically hyperactive city and state) is that many structural engineers get a little janky when you tell them they have to evaluate the structure and two different hanger assemblies for all of that cumulative “adequacy”. Steve L. From: Sprinklerforum [mailto:[email protected]] On Behalf Of Roland Huggins Sent: Monday, May 01, 2017 11:14 AM To: [email protected] Subject: Re: Hanging Pipe off system Piping 13 ALLOWS it in 9.1.1.8.1 (in the body) by saying shall not support NON-SYSTEM components. That means other system components can be supported. Then the annex further clarifies that yes indeed this includes system piping. I think this mainly started with hanging activation components for water spray systems. The main caveat is that the upper hanger must be sized to include the weight of the lower pipe (which naturally is 5 times the actual weight). I would argue that the 250 is only added once since you should not have two guys hanging in the same space (containing both pieces of pipe) at the same time. Just my opinion and not to be considered a formal interpretation of the NFPA or any of its technical committees. Roland Huggins, PE - Senior VP Engineering American Fire Sprinkler Assn. Dallas, TX http://www.firesprinkler.org<http://www.firesprinkler.org/> Fire Sprinklers Saves Lives On Apr 28, 2017, at 11:53 AM, Jerry Van Kolken <[email protected]<mailto:[email protected]>> wrote: We recently did a survey, and a question of legitimacy in the current installation of some piping supports came up. This system had a branchline with a drop to an arm-over that ran directly under the branchine. The arm-over is being supported by the branchline. Is this allowed? I personally think this is a bad installation but I skimmed the code and couldn’t find the answer one way or other. Jerry Van Kolken Millennium Fire Protection Corp. 2950 San Luis Rey Rd. Oceanside, CA 92058 (760) 722-2722 FX 722-2730 _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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