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NFPA 13D calls for a minimum of 2 sprinklers to be hydraulic calculated.
It does not appear that NFPA 13D requires extra sprinklers to be calculated for a dry pipe system. Is this correct? Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
7 Comments
Brett
5/22/2026 08:04:40 am
That is correct, but you will have to ensure that you meet the minimum 15 second water delivery time required by section 9.3.3.1.
Steve Gaillard
5/22/2026 08:27:21 am
Curious about why there is a dry system in a 13D system? Assuming a garage with living space above?
Dan Wilder
5/22/2026 08:36:06 am
If it's not listed in 10.2.1 (2025 edition but previous versions have similar language) I am not seeing anything. Due to the delivery time requirement of 15 seconds per 9.3.3.1, I think this alleviates an additional sprinkler requirement.
Chad
5/22/2026 10:28:10 am
A dry system for a 13D sounds… Suboptimal. It’s so unlikely to be adequately Maintained. Or stay dry. Unless this is very high end.
confused
5/22/2026 11:27:23 am
I agree. Living in North Dakota, I have never installed a dry system in a 13D occupancy.
Kevin Bossard
5/26/2026 08:03:34 am
Unless someone is choosing to live in an unheated home - I can't see where a dry head comes into play for a 13D system. That said, and to answer your question - no - a dry head does not come into play for the Hydraulic Calc - provided the purpose is to electively protect something outside the home. Calc is only required for the 2 heads hydraulically most remote inside the home.
danefre
5/27/2026 08:43:25 am
A 15‑second delivery time is very difficult to achieve, especially when you’re trying to pair a dry system with a 13D scope. Those two don’t really align well. Leave a Reply. |
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