I think Don kern hit it on the head, Unless it’s a high rise then a manual 
standpipe system is all that’s needed.

Anthony Carrizosa
Project Manager | Fire Protection
7855 S 206th St Kent, WA 98032
Cell: 206-679-5283 | Office Dir: 253-341-4593
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From: Steve Leyton <st...@protectiondesign.com>
Sent: Wednesday, April 3, 2024 8:57 AM
To: Discussion list on issues relating to automatic fire sprinklers 
<sprinklerforum@lists.firesprinkler.org>
Subject: [Sprinklerforum] Re: Standpipe Calculations

Yes, a building separation does divide the hydraulic demands to what is 
required on each side of the separation.   See Fig. A.10.6.1.2.3.1 (2024 ed).


The foregoing is my opinion only and does not represent NFPA or the NFPA 14 
Technical Committee, nor intended to serve as an interpretation of the standard.

Protection Design and Consulting
Steve Leyton, President
T  |  619.255.8964 x 102  |  
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From: Rick Matsuda <rick26...@gmail.com<mailto:rick26...@gmail.com>>
Sent: Wednesday, April 03, 2024 8:29 AM
To: Discussion list on issues relating to automatic fire sprinklers 
<sprinklerforum@lists.firesprinkler.org<mailto:sprinklerforum@lists.firesprinkler.org>>
Subject: [Sprinklerforum] Re: Standpipe Calculations

Here’s a thought which may be out way of line.

The 2-hour separation wall in the middle of the building was installed in lieu 
of an additional stairway. So technically there would have been three stairways 
and only three standpipes.

Does NFPA 14 allow you to install one standpipe by the separation and supply 
two hose valves on each level, one on each side of the wall, instead of two 
separate standpipes? If this is allowed then you’ll need to calculate only 
1000-gpm.

During a fire condition, the fire department should be hooking up to only the 
hose valve on the safe non-fire side.
Just my crazy opinion.
Rick Matsuda

On Apr 3, 2024, at 10:06 AM, Tstone52 
<tston...@comcast.net<mailto:tston...@comcast.net>> wrote:

The building code calls for buildings more than 3 stories to have Standpipes. 
13R has nothing to do with it.
G Tim Stone



On Apr 3, 2024 at 9:50 AM, <Fpdcdesign<mailto:fpdcdes...@gmail.com>> wrote:
13R buildings are not considered to be fully sprinklered.



On Apr 3, 2024 at 9:45 AM, <Shawn Foor<mailto:shawn.f...@gmail.com>> wrote:
Why would you do 1250 if it’s a fully sprinklered building?

Shawn Foor, SET

FOOR DESIGN, LLC
10208 E 98TH ST
TULSA, OK 74133
P:918-237-1400


On Wed, Apr 3, 2024 at 08:43 
<rimrock.design.servi...@gmail.com<mailto:rimrock.design.servi...@gmail.com>> 
wrote:
Asking this on behalf of Rowe Sprinkler Systems (Temporally Un-Retired)

We have a 4-story modular apartment building sprinklered in accordance with 
NFPA 13R with allowed exceptions, with 4 standpipes. The standpipes are 
connected at the 1st floor level. One each at the ends of the L shaped building 
and two at the approximate mid-point on either side of a 2-hour separation wall 
with self-closing, rated doors in the corridor.
The question is for purposes of calculating the standpipe can these be treated 
as two separate buildings? For example, 250 gpm at the far end of the 4th 
floor, 250 gpm at the far end of the 3rd floor and 250 gpm at the at the 
connecting point of the middle standpipe, for a total of 750 gpm.
Or do we have to calculate the additional standpipes up to 1250 gpm. Available 
water is the issue.


Richard L. Mote CET
Rimrock Design Services, LLC
Middleburg, PA 17842
Mobile 570-541-2685
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