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What products/methods have you used for hanging from Cold Form Trusses and Cold Form Shapes? Looking to hang and seismically brace just the sprinkler pipe.
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2 Comments
Dan W
1/16/2019 10:22:10 am
Depending on the gauge Sammy X-Press sidewinder or the SWDR types but those typically require the backing nut as well. I have gone to the roof with the vertical X-Press and avoided the trusses (hanging point was adjacent to each truss) in some cases. Seismic goes back to a bolt/nut/washer combo but in every instance we had to get structural approval for the hanging and bracing methods (super lightweight construction method) and they had to add additional structural reinforcement for the seismic points of attachment and for larger mains.
Pete
1/16/2019 10:48:09 am
Hanging from a metal roof is not permitted for steel pipe greater than 1" nominal diameter by NFPA 13. The Sammy side-winder express or swivel express (SWXP35 or SXP20) are permitted and have a self-contained backing nut, but the sidewinder is not FM approved, and these are only for pipe up to 4" (3/8" rod) and only for hanging. Once you get into bracing, you will have to compute the load in the zone of influence and match it up to a table for the bolt diameter in Ch 9 of NFPA 13. I'm looking at 2016- 9.3.5.12.2(g), and this is for a flush mount through bolt with backing nut and washer. There's also a prying factor that has to do with the brace angle that must be computed from the annex- or assume worst case (lowest rated weight allowance for that diameter). Leave a Reply. |
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