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We have a 300 sq ft control area (1 hour rated) for storage of Class IB flammable liquid. The 2018 IBC Table 307.1 permits 120 gallons (no sprinklers required), but this amount can be doubled if the building is equipped with an NFPA 13 automatic sprinkler system.
Our client would like to store about 165 gallons in the room (3 drums). The building is fully sprinklered. What is the required sprinkler design density for this room? We considered Ordinary Hazard Group 2 (same as lab area it supports) or Extra Hazard Group 2 (only occupancy in NFPA 13 that mentions flammable liquids). If EH2, then the minimum water demand becomes quite large: 0.4 x 2500 + 500 gpm hose = 1500 gpm (Under the 2016 NFPA 13 - Section 23.4.4.2.5). Could you help point us in the right direction? Thanks to all in advance for helping us hunt this down. Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
9 Comments
Eric D.
3/11/2022 08:19:50 am
I would recommend looking at NFPA 30, as it deals directly with flammable and combustible liquids. There are several factors to consider, such as miscibility of the material in water, container type, storage configuration, type of system (water, foam-water), etc.
Glenn S Berger
3/11/2022 08:29:19 am
Follow NFPA 30 the the storage room only. You do not need to apply the higher density over the entire remote area since you will have fire-rated separation.
Karen P.
3/11/2022 09:12:05 am
Thank you Glenn. We have reviewed 2016 NFPA 13 small room rule and, assuming our interpretation is correct, it seems we still need to calculate over entire remote area per 11.2.3.3.4. A smaller remote area would certainly help! Let me know if we've missed something.
COLIN LUSHER
3/11/2022 10:39:19 am
Karen, that is NOT a correct interpretation. The room design method is used BECAUSE the area of the room is usually less than the areas shown on table 11.2.3.1.1. Paragraph 11.2.3.3.4 only states that if the room is smaller than 1500 sq. ft. (for light or ordinary hazard), or smaller than 2500 sq. ft. (for extra hazard), that the design DENSITY from table 11.2.3.1.1 shall still apply. So no matter what size the room, the density cannot be less than the minimum design density of 11.2.3.1.1. T
Pete H.
3/11/2022 01:53:32 pm
Karen, is this mercantile or storage occupancy? Or something different?
Glenn Berger
3/14/2022 08:11:07 am
For the record, my response never included the NFPA 13 Small Room Exception. My response stated fire-rated boundary.
Jesse
3/11/2022 09:06:15 am
You'll find design criteria for this in NFPA 30
Joshua Freedman
3/11/2022 12:22:33 pm
You can design it to NFPA 30 requirements or FM 7-29. If you design to NFPA or FM criterion, you and your client wont run into trouble down the road as the local AHJ doing the sign off might accept something less but the client will have issues with their insurance provider or other agencies.
Alex Riley
3/11/2022 01:35:37 pm
Echoing above! Sorry I'm late to the punch today. NFPA 30! Leave a Reply. |
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