We always calc a mix if one is present. Sometimes they drive an over-discharge that increases demand, sometimes they don't. Be sure to try every combination (4+0, 3+1, 2+2, 1+3, 0+4).
We have even found that calculating a 4-line group that crosses 2 systems can create a higher demand if you pressure balance them at the riser. I don't know if it is technically a requirement to do that, but it seemed like a good idea. As Travis mentioned - it can be much easier to just split the systems at the k-factor change. It just depends on how much material can be saved vs how much the design time will cost. Matt -----Original Message----- From: Sprinklerforum <sprinklerforum-boun...@lists.firesprinkler.org> On Behalf Of Kyle.Montgomery via Sprinklerforum Sent: Tuesday, December 28, 2021 9:18 AM To: sprinklerforum@lists.firesprinkler.org Cc: Kyle.Montgomery <kmontgom...@aerofire.com>; Jamie Seidl <jamie.se...@gmail.com> Subject: RE: [EXTERNAL] Re: Mixing ESFR Sprinklers How do you guys calc these systems? Just the K22 section and the K17 section separately? Or a combo? I think there are situations where having one line of K17s (at 52 psi) in your remote area would be the "worst-case" scenario because that 52 psi would drive some overflow in the two lines of K22s (that only need 40 psi at that height). Or do you actually split the systems (zone boundaries) so that there isn't a system that has both types? -Kyle M -----Original Message----- From: Sprinklerforum <sprinklerforum-boun...@lists.firesprinkler.org> On Behalf Of Jamie Seidl via Sprinklerforum Sent: Friday, December 24, 2021 3:48 PM To: Sprinklerforum <sprinklerforum@lists.firesprinkler.org> Cc: Jamie Seidl <jamie.se...@gmail.com> Subject: [EXTERNAL] Re: Mixing ESFR Sprinklers Yep, typically end up with K22's down the center at the peak, with a K17 sandwich to the outside. Jamie Seidl On Fri, Dec 24, 2021 at 1:41 PM Mike Hairfield via Sprinklerforum < sprinklerforum@lists.firesprinkler.org> wrote: > Here is the situation: > > Building has 40'-8" Maximum Ceiling height at the ridge, the building > is designed with K16.8 ESFR's. > > Can the areas that are over the 40'-0" maximum ceiling height be > designed using K22.4 or K25.2 ESFR's and be approved? > > Thanks, > > Mike Hairfield > _______________________________________________ > Sprinklerforum mailing list > Sprinklerforum@lists.firesprinkler.org > > https://urldefense.com/v3/__http://lists.firesprinkler.org/listinfo.cg > i/sprinklerforum-firesprinkler.org__;!!Ba8_KKAT!a7NwbGit-6dyv1Yq8Jg4tE > ZyjB-DjWMrCPViH_HpelfxKczficVerWb6qDNJu50YskU$ > _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org https://urldefense.com/v3/__http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org__;!!Ba8_KKAT!a7NwbGit-6dyv1Yq8Jg4tEZyjB-DjWMrCPViH_HpelfxKczficVerWb6qDNJu50YskU$ _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org https://linkprotect.cudasvc.com/url?a=http%3a%2f%2flists.firesprinkler.org%2flistinfo.cgi%2fsprinklerforum-firesprinkler.org&c=E,1,IOrAbg4P-PYiyesETXEEkcTYQi7t_OaVQxx6Dc4UqAFvHGTpfrF6_tWviQcn961DYnjMXrTuNXUzmoiJR1_7eqTYZ-JQMXv4rsFu_IHhmr1GDQ,,&typo=1 _______________________________________________ Sprinklerforum mailing list Sprinklerforum@lists.firesprinkler.org http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
