Do sprinkler service entry sizes have a minimum mandated size for an NFPA 13 system?
If I do not have a hydrant on an incoming line and can prove hydraulically that a 3-inch service entry works, is that acceptable under 13 or only permissible in 13R or 13D projects? Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe
9 Comments
Franck
4/21/2020 08:58:30 am
(To be confirmed by US resident, more used than I am to US requirements)
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Jonathan Sullivan
4/21/2020 10:20:50 am
Franck - you are correct.
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MIKE
4/21/2020 10:13:28 am
Refer to NFPA 24.
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Jonathan Sullivan
4/21/2020 10:27:36 am
Mike - can you provide a section reference? I had thought that the Size of Fire Mains sections matched between the two standards.
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Mike
4/21/2020 03:36:10 pm
My mistake. I can't find a reference but I remember it from somewhere or maybe it's just my imagination.
James Phifer
4/21/2020 10:39:37 am
Check Out NFPA 13 2016 ed. chapter 24 section 24.1.3
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Thomas Jones III
4/21/2020 10:48:40 am
No minimum size requirements for incoming lines that I know of. However, if it is a combined domestic/fire line you do not have to include the domestic demand in your calculation if the line is 6" or larger.
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Jonathan Sullivan
4/21/2020 10:54:52 am
I'm used to separate feeds for these services. When do you see combined used and how are these designed? NFPA 24 and local utility requirements from street into the building, and then tee off to domestic and fire services inside?
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Pete D
4/21/2020 11:03:34 am
Don't forget to consider that you are designing for the current occupancy and all future occupancies, and material is not the largest contributor to cost.
Reply
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