I have an existing penthouse that has limited (no) access to the structure at the roof and requires sprinkler coverage. We have a variance from the AHJ to omit sprinklers from non accessible areas. Has anyone designed a sprinkler system supported from the floor entirely by pipe stands or pipe racks? I'm aware of the requirements of NFPA 13-16 CH 9.1.1.2. The structural engineer on my project is not eager to get involved so alternative options especially pre-engineered options would be great. I'll push back if there aren't better options but looking for any advice.
I'm also aware of NFPA 13-22 CH 17.5 however 8-0'' tall pipe stands don't seem especially stable. Preferably I'd like a Unistrut solution a contractor can assemble in field and place as required say every 10-0'' ( see pictures) Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
8 Comments
3/15/2024 08:43:45 am
If they use unistrut they have to use half straps or U-bolts. Unistrut pipe clamps (those two piece straps you see on plumbing and electrical) are not UL listed for sprinkler piping. They are ok for drain and test piping, but cannot be used on system piping.
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DE
3/15/2024 08:52:05 am
We've had to do it something like that before but not at that height.
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Todd E Wyatt
3/15/2024 09:24:39 am
“We have a variance from the AHJ to omit sprinklers from non accessible areas.”
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Todd E Wyatt
3/15/2024 09:25:05 am
REFERENCES
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David Williams
3/15/2024 09:36:54 am
Unistrut has an engineered design group that could handle structural design if needed. They are often called on for OR equipment supports and the like.
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Jack G
3/15/2024 09:41:36 am
I ve used pipe stands on exposure systems around transformers as outlined in exposure protection phamplet. I m sure if provuded simularley they would be acceptable.
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Jesse
3/15/2024 09:47:52 am
Lots of good comments about Unistrut and their engineered design group. We done things similar to this (though not at this scale) for protecting freezers / coolers outside of a restaurant. They might be able to help.
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RYAN HINSON
3/15/2024 09:55:55 am
Consider getting AHJ buyoff on using NFPA 15 (2022) Standard and Annex Sections 6.3.2 for pipe supports and system stability bracing requirements. We use this often for similar applications.
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