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I have been asked to design a sprinkler system for a 4 story building as per NFPA 13R. The building has existing standpipes consisting of three 2 1/2” risers. I am hoping to use the existing standpipe risers to also feed the sprinkler system.
In this scenario would it make sense to include a hose allowance even though NFPA 13R does not require it? Also, since NFPA 13R doesn’t require zoning by floor, would it be plausible to have one single “Standpipe & Sprinkler Water Flow Alarm” at the water entry? I appreciate and respect your input. Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe
3 Comments
Joe
10/7/2019 04:55:42 pm
One waterflow should be OK, as long as the total square footage for all floor levels doesn't exceed the limits of a single system.
sean
10/8/2019 06:52:52 am
NFPA 14 requires sprinkler/standpipe combination risers to be equipped with certain features.
Skyler
10/9/2019 12:32:08 pm
First, I really like the idea of adding hose demand. Knowing that the intent of 13R is that the local fire department will be needed to knock down a fire. That being said, I don't know what your city supply is like, but 2-1/2" standpipes are unlikely to support 100 GPM and the flow from 4 residential sprinklers. I would try it, and if I could get it to work with the hose demand, then great. Otherwise, you can hang your hat on the fact that there is no code requirement for hose demand in 13R and this is probably a manual standpipe; the fire department can/will pump their own water when they use the standpipe. City pressure around here isn't good enough by itself to get the roughly 80 psi that our firemen's fog nozzles want anyway. Leave a Reply. |
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