The 2016 and 2019 standards are allowing ESFR designs that the 2022 standard does not.
For example: A warehouse with a ceiling at 35-ft. Group A Unexpanded Exposed on floor probably to 20-ft. Sprinkler design is ESFR, (12) K16.8 pendents @ 52 psi. This was okay in 2016 and 2019, but now, 2022 does not allow for this. Does this mean they completed tests that show this 12@52 K-16.8 WILL NOT work? Is there fire testing to prove this? Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
8 Comments
Josh
7/26/2023 08:18:56 am
I'm not sure I follow. Table 20.17.1.2(c) shows the options for ESFR for storage and has the 30' ceiling height would put you solidly in the 25.2 k-factor range. There are heights where there are only a few options though.
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Jesse
7/26/2023 08:26:10 am
Great question. I'm on 3 NFPA committees but not 13. I've reached out to a buddy of mine that is to see if I can get an idea.
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Casey Milhorn
7/26/2023 08:56:29 am
I'm curious as well. There has definitely been a push for larger K factor ESFRs over the last decade, protecting a broader range of storage heights. Might be some pressure from manufacturers as well to gravitate towards K22.4 and larger due to lack of sales in the smaller sizes.
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Pete H
7/26/2023 09:01:23 am
My best guess:
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Glenn Berger (for Renee)
7/26/2023 09:07:39 am
The SFPE has had some presentations from FM on sprinklers for storage systems. I recommend checking out information at their website.
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Chuck
7/26/2023 09:41:53 am
My understanding is, part of the k-16.8 approval was based on tests conducted on the k-14 head which later proved to be inaccurate. So, when they constricted the k-14 designs, the k-16.8 was caught in the revision.
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Dan Wilder
7/26/2023 09:55:51 am
The FM Global report on the ESFR testing
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Franck
7/26/2023 01:46:06 pm
I had (alsmost) a similar issue a few weeks ago.
Reply
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