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Does a zone control valve (floor control assembly) count towards the riser area limitation, as a sprinkler riser would? Thanks in advance. Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe 
7 Comments
Dan Wilder
12/2/2025 07:29:51 am
The area restriction is a maximum square footage per system riser (area dependent on the adopted NFPA or local fire code). There is no maximum number of system risers. This one line looks pretty typical for a multi-story building without knowing the actual square footage of each floor or building setup (looks close to how a hospital would be segmented).
Glenn Berger
12/2/2025 08:16:19 am
One of the keys to the limits of a riser is "per floor" requirement. The riser diagram is standard for any hospital (as Dan mentioned, or any school building, hotel, etc.
Jesse
12/2/2025 08:19:30 am
Not sure exactly what you're asking but I think the question pertains to system size. 13 says the maximum system size for Light Hazard is 52,000 sq. ft, but it does take into account floor control assemblies like you have shown. The intent was to be able to isolate a max of about 400 sprinklers. So if you have 4 story building with a ground floor of 20,000 sq. ft. and that foot print stays typical for all 4 floors, the overall square footage would be 80,000 sq. ft. But the floor control assemblies allow isoslation of that entire section.So while you only have 1 riser in the riser room feeding all 4 floors, the floor control assemblies allow you to isolate the system areas.
Dave L.
12/2/2025 11:25:50 am
Just a reminder, for the 2025 edition of NFPA #13 the 52,000 s.f. has been increased to 78,000 s.f.
Anthony
12/2/2025 08:31:09 am
The supply pipe is not part of the area limitation. The limiting area starts after the control valve, check flow switch etc. that's the "riser assembly" or "floor control assembly"
Brett
12/2/2025 08:31:42 am
The maximum area limit is per floor and it's specifically "any one floor to be protected by sprinklers supplied by any one sprinkler system riser or combined system riser".
Jack G
12/2/2025 04:52:19 pm
You should probably review chapter 5 in IBC which limits the floor areas in multistory buildings per types of construction in sprinkler protected and NS protected. Leave a Reply. |
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