Duration for NFPA 409 Hose Allowance?

7/29/2021

NFPA 409, 2016 Edition, Sections 6.2.10 and 7.8 discuss the addition of a 500-gpm allowance for exterior hose.

The standard does not specify a duration, only to fall back on NFPA 13 for calculation purposes.

Without any firm guidance, am I looking at a duration of 90-minutes for Extra Hazard occupancy?

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2 Comments

Darin Golden

7/29/2021 12:01:55 pm

NFPA 13 (16ed)

11.1.6.2 Handbook Commentary
If no inside hose connections are provided, the outside hose requirement is the value in "total combined inside and outside hose" column of Table 11.2.3.1.2.

11.2.3.1.2
The min water supply shall be available for the minimum duration specified in Table 11.2.3.1.2

Table 11.2.3.1.2 Duration for Extra Hazard Occ is 90-120 minutes

Remember the hose stream demand required by NFPA 13 is intended to provide the FD with the extra flow to conduct final extinguishment and mop up operations in a sprinklered building. This is separate from the Fire Flow requirements from IFC.

Mike

7/30/2021 09:42:15 am

I believe it will be for the duration of the required water supply.

Supplementary protection is 45 minutes.

Water Supply durations are established in 7.8* Water Supply.

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Duration for NFPA 409 Hose Allowance?

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