Can you use the Room Design method? Look at NFPA 13 – 2016 – section 11.2.3.3.4 and then 11.2.3.1.4 (2) looks like if the room is smaller than the required area of an EH1 @2500 sqft then use the size of the room @ the required density for the 2500 sqft. ( .30/2500) or .30/300 for your room.
Anthony Carrizosa Project Manager | Fire Protection 7855 S 206th St Kent, WA 98032 Cell: 206-679-5283 | Office Dir: 253-341-4593 [cid:[email protected]] https://archerconstruction.com<https://linkprotect.cudasvc.com/url?a=https%3a%2f%2farcherconstruction.com%2f&c=E,1,Wdb65AWzMgSBzW3HDw91SfcRQCtxDUQKoJf-UowQ-WnB_WMosgG-8W7eLePJ42PwWQvLiQx16Pls052VqwHO7tKm-_u5AnWly0ewkNiMkxn-AjQb1JI,&typo=1> From: Matt Grise <[email protected]> Sent: Thursday, February 8, 2024 8:54 AM To: Discussion list on issues relating to automatic fire sprinklers <[email protected]> Subject: [Sprinklerforum] Small ESFR system We are looking at an auto repair facility that has a very small tire storage room (apx 300sf). The tire storage space is open on one side to the misc parts storage area (short-shelf OH2). Our thought was to protect the tire storage space with a small ESFR system that extends 15' into the misc parts storage area. The other 3 sides of the tire storage room are CMU and extend to the deck. Even with the 15' extension into the lesser hazard area, there are only 6 ESFR sprinklers needed. (2 heads on 3 lines) = 540sf. Based on the annex commentary in NFPA 13 2016 A11.1.2, our plan was to calc the 6 esfr heads (the full higher-hazard area plus 15' = 540sf) along with 960sf at .2gpm/sf to round out the larger of the two operating areas. We received some pushback because there is no ESFR design criteria that only uses 6 heads, so the plan reviewer was concerned that we were not following the 12-head design for an ESFR system. There was a suggestion that we should pretend there were 12 heads and calc a 12 head area (even though 6 would never be installed).I figured that since we were calculating ALL of the ESFR heads in the building, that would be ok. Has anyone seen anything like this before? Any thoughts? Thanks! Matt Grise
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