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We have an ESFR project with Obstructed Construction and want to be sure we're locating the height of the sprinkler 100% correct. This is an FM-Global project.
We are using K14 ESFR uprights. The bays are 25-ft x 25-ft boxed with W27 beams and contain small bays with W18 beams that are 6'-3" in-between. As far as I can tell, the sprinkler height is compliant as long as the center of the operating element does not exceed 6-inches below the W18 beams, to a maximum of 22-inches below the deck. So 4-inches maximum below the W18 beams is the target. We're using Table 8 in FM Data Sheet 8-9 for the design criteria. Is this approach correct? Thanks in advance. Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
4 Comments
Pete H
12/11/2023 07:38:49 am
I'm sorry for asking, but where are you getting the 22 inches max below deck from? I'm not seeing anything in 8-9 (admittedly my 8-9 document isn't up to date) about distance under ceiling in obstructed construction and if I was defaulting to NFPA 13 (2016 edition) I'd be in 8.12.4.1.4 which gives me having the deflector at 3 inches to 12 inches below the ceiling. 8.6.4.1.2 would not apply to an ESFR sprinkler.
Dan Wilder
12/11/2023 07:51:50 am
FM 2-0 Fig 2.5.4.4.2 - Flow Chart indicates for a ceiling slope <4:12 with structural members <24" deep,
Jesse
12/11/2023 03:17:57 pm
Yep Dan is on the money here. The firestopping should be fun...
sean
12/31/2023 06:49:56 pm
agreed Leave a Reply. |
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