...and response time within the compartment is the same per NFPA 13 (2019) Section 9.4.3.3 and as otherwise stipulated in specific chapters.
Ryan L. Hinson, PE*, SET** \ Burns & McDonnell Senior Fire Protection Engineer O 612-900-3755 \ M 763-688-4045 \ F 952-229-2923 [email protected] \ burnsmcd.com 8201 Norman Center Drive, Suite 500 \ Minneapolis-St. Paul, MN 55437 *Registered in: AK, LA, MD, MN, PA, TX, & UT **NICET IV - Water-Based Systems Layout -----Original Message----- From: Sprinklerforum <[email protected]> On Behalf Of Kevin Hall via Sprinklerforum Sent: Friday, October 29, 2021 10:26 AM To: [email protected] Cc: Kevin Hall <[email protected]>; Sean Lockyer <[email protected]> Subject: Re: Mixing of K-Factors in self-storage facilities Sean, While that section does say "small rooms" in the 2019 edition, it was not the committee's intent to only allow different K-factor sprinklers in light hazard occupancies less than 800 sq. ft based on the definition. The language was updated for the 2022 edition to clarify that intent: 28.2.4.9.3* Sprinklers with different K-factors shall be acceptable for specific uses, such as exposure protection, small enclosures, smaller portions of a room, or directional discharge, where an adjacent sprinkler does not need to discharge as much water. Committee Statement: This change combined with better alignment of Annex material is attempting to emphasize that the identified applications are just some of the examples where different K-factor sizes can be applied. Particularly, it needs to show that this can occur within the same room without there being a change in orientation between the different sprinklers. Additionally, the reference to a Small Room is misleading since an area of up to 800 sf is not a justification for changing K-factors (nor is the restriction to light hazard applicable). As long as the change in K-Factor is not for hydraulic balancing, it is permitted. Thanks, Kevin The above is my opinion and has not been processed as a formal interpretation in accordance with the NFPA Regulations Governing Committee Projects. This is provided with the understanding that the AFSA assumes no liability for this opinion or actions taken on it and they are not to be considered the official position of the NFPA or its technical committees. AFSA cannot provide design or consulting engineering services, and this opinion should therefore not be considered, nor relied upon, as such. Kevin Hall, M.Eng., P.E., ET, CWBSP, PMSFPE Coordinator, Engineering and Technical Services American Fire Sprinkler Association [email protected] 214-349-5971 On Fri, Oct 29, 2021 at 10:09 AM Sean Lockyer via Sprinklerforum < [email protected]> wrote: > NFPA 13 generally discourages the use of mixing K-Factors in a system; > however, the mixing of K-Factors is allowed in certain circumstances, > namely in section 23.4.4.9.3 where it allows such use for small rooms > and enclosures. In a self-storage facility, the small 5' x 5' storage > units would not be considered "small rooms" as they are not light > hazard (once again, per the strict definition as layed out in chapter > 3). However, would you be able to consider the small units as > enclosures since they are completely separate rooms from the other, larger > self-storage units ? > > Sean Lockyer > Project Designer 6817 N. Orange > Blossom Trail > Cell 386-337-1078 Orlando, > Florida 32810 > [email protected] Phone: 407-816-9101 > > https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.a > itlifesafety.com%2F&data=04%7C01%7Crhinson%40burnsmcd.com%7C57676d > e029f84e03d5f708d99af07a60%7Cbfbb9a2b6d994e78b3c795005d555c8b%7C0%7C0% > 7C637711179937114485%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQI > joiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=Mpv3ntdo9L2 > 3D7x63eApasEJCMvjbfmUyWgU4Lh8UNQ%3D&reserved=0 > > > > > > > > > > > > > > > > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists > .firesprinkler.org%2Flistinfo.cgi%2Fsprinklerforum-firesprinkler.org&a > mp;data=04%7C01%7Crhinson%40burnsmcd.com%7C57676de029f84e03d5f708d99af > 07a60%7Cbfbb9a2b6d994e78b3c795005d555c8b%7C0%7C0%7C637711179937124438% > 7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik > 1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=stHf24kU8GWQ90o1%2FQCgC4FCaG80mz > %2BlbrTnOInUl94%3D&reserved=0 > _______________________________________________ Sprinklerforum mailing list [email protected] https://nam12.safelinks.protection.outlook.com/?url=http%3A%2F%2Flists.firesprinkler.org%2Flistinfo.cgi%2Fsprinklerforum-firesprinkler.org&data=04%7C01%7Crhinson%40burnsmcd.com%7C57676de029f84e03d5f708d99af07a60%7Cbfbb9a2b6d994e78b3c795005d555c8b%7C0%7C0%7C637711179937124438%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=stHf24kU8GWQ90o1%2FQCgC4FCaG80mz%2BlbrTnOInUl94%3D&reserved=0 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
