Higher Hazard Class Extended in Remote Area?

6/21/2019

The remote area for a wet hydraulically-calculated sprinkler system contains two different hazard classifications - Light and Ordinary Hazard Group II.

When using the density/area method of NFPA 13, is each sprinkler calculated only to the hazard within the room it protects? If the OH2 spaces are confined to small storage rooms (with walls and doors), does the OH2 density have to extend beyond the OH2 room at all?

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3 Comments

Anon

6/21/2019 11:59:12 am

...Note that when using density/area method, walls are generally not considered in delineating the remote area (although I wish it clearly stated that somewhere).
However they are in terms of the guidance at the beginning of Chapter 11 "Design Approaches" (in the 2013 & 2016 - Might need to do use the Meyer Tool to find it in the 2019) under "Adjacent Hazards." Sometimes the easily-overlooked 23.4.4.1.1.4&5 in the 2013 / 23.4.4.2.4&5 in the 2016 also come in the play. Gotta get back to work, but feel free to correct me if I am wrong.

Mike

6/21/2019 12:10:37 pm

NFPA 13, 11.1.2 (1)

"Where areas are not physically separated by a barrier or
partition capable of delaying heat from a fire in one area
from fusing sprinklers in the adjacent area, the required
sprinkler protection for the more demanding..."

The walls would be a barrier even if not fire resistive.

Kevin Clay

6/21/2019 09:59:34 pm

Concur

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