When calculating the number of operating sprinklers in a design area for a hydraulic calculation and where we have 2 levels of protection, do we include:
a) Both those sprinklers in the void and below the suspended ceiling in the design area; b) Just those sprinklers in the void; c) Just those sprinklers below the ceiling, or d) 50% of each? Any responses really appreciated. Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
7 Comments
Pete H
3/14/2023 07:12:55 am
NFPA 13 (2016 edition):
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Pete H
3/14/2023 07:14:32 am
Mind you, an AHJ can still request (and you can still provide) a separate calc for the below obstruction heads (to cover the complete floor area) if you're using a method that might make the AHJ think it is not the same sizing pattern (I.E. Flexheads).
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Anthony
3/14/2023 07:39:30 am
Pete nailed it. I have seen request for both the above area protection and below area protection almost every time the number of sprinklers are close. This is common where you're using large cloud ceilings and the effective total remote area is covered by the cloud ceiling but the space between the clouds is too large to omit over head sprinkler.
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Franck
3/14/2023 10:14:19 am
I would do b and c
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Kelsey
3/14/2023 10:23:37 am
You only need to calculate the floor area once.
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Jesse
3/14/2023 03:22:13 pm
B and C. This is the way
Reply
Alex
3/16/2023 06:00:17 am
Others nailed it. You only need to calc either above or below, whichever is most demanding.
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