What is the Hose Allowance for NFPA 13R?

7/21/2021

We have a two story apartment building, and we are installing an NFPA 13R wet pipe sprinkler system.

Is an outside hose demand required to be included within the calculations?

There are no inside hose stations.

If outside hose demand is required, is the demand the same as light hazard? 100 gpm?

We couldn't find a reference to this in NFPA 13R.

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3 Comments

Pete

7/21/2021 07:06:51 am

Hose allowance is not required in 13R calculations.

There is a fire flow demand in the IFC in B.105.2 and Table B.105.1 which could affect outside hose demands (and result in a need for extra hydrants.

Best reference for hose allowance not being required in 13R that I can find offhand is 13R (2016) A.7.2 (in reference to sprinklers outside the dwelling unit) "It is only the intent of NFPA 13R to reference the sprinkler discharge (flow and pressure), number of design sprinklers, and positions of sprinklers requirements of NFPA 13. Other rules from NFAP 13 such as sprinklering of combustible concealed spaces, hose stream demand, and water supply duration are not intended to be referenced by Section 7.2....(etc.)"

There might be better out there.

Dennis

7/21/2021 08:06:58 am

No requirement for Hose Allowance. However, if it is a combined service, be sure to include your domestic demand!

Jesse

7/21/2021 08:09:15 am

There is no hose allowance in a 13R calc. But, you may have to account for a domestic demand depending on your system.

Refer to 2016 NFPA 13R Tables A.9.6.(a) and A.9.6.(b)

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What is the Hose Allowance for NFPA 13R?

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