Rick, This is an interesting train of thought. Logically there should never be a reason to use the hose connections on both sides of a horizontal exit at the same time. This jives with the allowance to remove the hose valve on one side of the separation if the other side can be completely covered from the far stairwell.
Nothing in the Flow Rates section of chapter 10 allows this however, and I think it may even be specifically prohibited by 10.6.1.1.7 “Where lateral piping serves a single hose connection, the minimum flow rate for the system shall be determined as if the hose connection is being served from a separate standpipe.” It really does make sense though to consider the hose connections on opposite sides of a horizonal exit to be a single standpipe. I would be interested in getting other readers thoughts on this. Sincerely, Eric Rieve, SET Rieve Fire Protection From: Rick Matsuda <rick26...@gmail.com> Sent: Wednesday, April 3, 2024 11:29 AM To: Discussion list on issues relating to automatic fire sprinklers <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 EMAIL rimrock.design.servi...@gmail.com<mailto:rimrock.design.servi...@gmail.com> WEB: www.rimrockdesignservicesllc.com<http://www.rimrockdesignservicesllc.com> _________________________________________________________ SprinklerForum mailing list: https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org To unsubscribe send an email to sprinklerforum-le...@lists.firesprinkler.org<mailto:sprinklerforum-le...@lists.firesprinkler.org> _________________________________________________________ SprinklerForum mailing list: https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org To unsubscribe send an email to sprinklerforum-le...@lists.firesprinkler.org<mailto:sprinklerforum-le...@lists.firesprinkler.org> _________________________________________________________ SprinklerForum mailing list: https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org To unsubscribe send an email to sprinklerforum-le...@lists.firesprinkler.org<mailto:sprinklerforum-le...@lists.firesprinkler.org> _________________________________________________________ SprinklerForum mailing list: https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org To unsubscribe send an email to sprinklerforum-le...@lists.firesprinkler.org<mailto:sprinklerforum-le...@lists.firesprinkler.org>
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