I didn't know of the bevel washer. That will be handy in the future. Thank you.
On Thu, Jan 2, 2020 at 10:35 AM Hinson, Ryan via Sprinklerforum < [email protected]> wrote: > Assuming you have done your homework regarding whether and at what hanger > spacing the structure can support the weight of the water-filled pipe in > accordance with NFPA 13; in my experience, one still cannot hang from the > bottom lip of exposed Z-purlins and must instead hang with something like a > Cooper B-Line #51 side beam bracket from the center 1/3 of the purlin spine > with ½” nut, bolt, and washers to not void the listing of the support > structure itself. From the side beam bracket, a ½” rod hanging down with a > nut and Figure B3234 bevel washer oriented such that the rod can hang > straight down *without* lateral loading or bending since it is axially > loaded vertically in the direction of gravity thus complying with NFPA 13 > (2019) Section 17.2.1.6 along with handbook commentary: > > > > *Threaded Sections of Rods.** Threaded sections of rods shall not be > formed or bent.* > > *The requirement in 17.2.1.6 also applies to the rod once it is installed. > Cracks can result if the rod is arranged with a lateral load applied to it. > In other words, the rod must be axially loaded once it is connected between > the building structure and the system pipe. Hanger attachments are > available that are listed for attaching to the building structure and that > can accommodate angles from vertical, allowing the rod to remain unbent.* > > > > I have seen many installations whose structural connections do not allow > purely axial loading in the rod hangers and induce lateral loads in > violation of this standard section. > > > > Don’t forget that ultimately, the structural member manufacturer (Butler > in this case) must be consulted for allowable connection location means and > methods regarding drilling of their engineered structural members. > > > > Good luck! > > > > *Ryan L. Hinson**, PE*, SET*** \ Burns & McDonnell > > Senior Fire Protection Engineer > > *O* 952-656-3662 \ *M* 320-250-5404 \ *F* 952-229-2923 > > [email protected] \ burnsmcd.com <http://www.burnsmcd.com/> > > 8201 Norman Center Drive, Suite 300 \ Bloomington, MN 55437 > > *Registered in: LA, MD, MN, PA, TX, & UT > > **NICET IV - Water-Based Systems Layout > > > > *From:* Sprinklerforum <[email protected]> *On > Behalf Of *James Litvak via Sprinklerforum > *Sent:* Thursday, January 2, 2020 7:37 AM > *To:* [email protected] > *Cc:* James Litvak <[email protected]> > *Subject:* Looking for a 6" hanger for sloped roof > > > > I'm trying to hang 6" pipe flat beneath a roof with a 4:12 slope, but > having trouble finding an attachment. It's a standard Butler-style building > with Z-purlins, and I'm hanging the pipe flat, both perpendicular and > parallel to the slope. The Sammy hangers with swivels are not listed, and > the slope is way too steep to "adjust" the rod. About the only thing I have > been able to find is welded linked eye rods from Tolco ( > http://www.cooperindustries.com/content/dam/public/bline/Resources/Library/catalogs/pipe_hangers/pipe_hangers_and_supports/TA-EyeRod.pdf > <https://nam05.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.cooperindustries.com%2Fcontent%2Fdam%2Fpublic%2Fbline%2FResources%2FLibrary%2Fcatalogs%2Fpipe_hangers%2Fpipe_hangers_and_supports%2FTA-EyeRod.pdf&data=02%7C01%7Crhinson%40burnsmcd.com%7Cbf61c7082e63425ad89308d78f88e034%7Cbfbb9a2b6d994e78b3c795005d555c8b%7C0%7C1%7C637135690352455044&sdata=zAKwLO4H566Pwcw88U0zCtwiFxCqPqgQYZ1%2FPCZcgxA%3D&reserved=0>). > However, even though the Z-purlins are heavy gauge, it seems like a bad > idea to hang from the bottom lip. In which case, even if I went with the > linked eye rods, hanging from the side of the purlin seems like it would > create its own difficulty. Does anyone here have a suggestion for how to > hang in this situation? I also need to trapeze the pipe across the slope, > but I figure whatever solution I can use to hang the pipe across the slope > will also work for trapeze hangers. > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org >
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