Do liquid nitrogen storage rooms need to be fire-resistance rated?
According to NFPA 55 (2016 Edition) Section 6.4.4, gas storage rooms need to be 1-hour fire rated, but it just seems odd since nitrogen can be used as an extinguishing agent.
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1/18/2021 08:09:12 am
You'll want to check out the compressed gas definition in 126.96.36.199. Liquified gases with a boiling point of 68 F or less at 14.7 psi are considered compressible for the purposes of NFPA 55 (and IFC too).
1/18/2021 09:29:15 am
The quantity of stored liquid nitrogen can be factor in determining if fire rating is required. Is it just being stored, or is it a part of a closed loop system?
1/18/2021 09:37:32 am
I believe they are just liquid nitrogen dewars being stored and not connected to a closed loop system. I am unsure of how much they are storing as of now.
1/18/2021 09:31:24 am
NFPA 13 2019 26.11 provides sprinkler criteria similar to as outlined below.
1/18/2021 09:42:49 am
Makes sense. Thanks for the input!
1/18/2021 02:04:04 pm
If you look at the parent of that code section, 55.6.4, it is stating that "Where a gas room is used to the threshold quantity for a gas requiring special provisions...the room shall meet the requirements for 6.4.1 to 6.4.5. As an inert gas, table 188.8.131.52.1 does not set a requirement for Nitrogen, based on that parentage, I would argue that the clause 184.108.40.206 would not apply.
1/19/2021 11:36:55 am
Just one small comment on the following sentence (for the rest of the technical conversation, it was well detailed above, in particular by CJ BONCZYK):
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