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 184.108.40.206.5).
Could you help point us in the right direction? Thanks to all in advance for helping us hunt this down.
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