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.

Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe

5 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!

Bobby

4/20/2023 09:24:50 am

What if there are multiple buildings? Do you include domestic demand for all buildings, or just one?

Nathan

4/21/2023 11:26:56 am

All buildings being fed by the shared fire/domestic loop or main need to be included in domestic demand calcs. Check the local jurisdiction for which domestic demand calc method is accepted.

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)

Leave a Reply.

Home
Our Cause

The Blog
The Forum

PE Exam Prep
The Toolkit
MeyerFire University

Pricing
Login
Support
Contact Us

MeyerFire.com is a startup community built to help fire protection professionals shine.
Our goal is to improve fire protection practices worldwide. We promote the industry by creating helpful tools and resources, and by bringing together industry professionals to share their expertise.

MeyerFire, LLC is a NICET Recognized Training Provider and International Code Council Preferred Education Provider.
All text, images, and media Copyright © 2023 MeyerFire, LLC

We respect your privacy and personal data. See our Privacy Policy and Terms of Service. The views, opinions, and information found on this site represent solely the author and do not represent the opinions of any other party, nor does the presented material assume responsibility for its use. Fire protection and life safety systems constitute a critical component for public health and safety and you should consult with a licensed professional for proper design and code adherence.

Discussions are solely for the purpose of peer review and the exchange of ideas. All comments are reviewed. Comments which do not contribute, are not relevant, are spam, or are disrespectful in nature may be removed. Information presented and opinions expressed should not be relied upon as a replacement for consulting services. Some (not all) outbound links on this website, such as Amazon links, are affiliate-based where we receive a small commission for orders placed elsewhere.

What is the Hose Allowance for NFPA 13R?

Leave a Reply.

ALL-ACCESS

SUBSCRIBE

COMMUNITY

YOUR POST

PE EXAM

FILTERS

ARCHIVES

PE PREP SERIES