K factor is simply a ratio of pressure and GPM discharged and can be assigned to an orifice, or an orifice and piping etc. Dry barrel sprinklers are not a simple piece of empty schedule 40 pipe or whatever, you don’t adjust for the barrel length unless the manufacturer tells you to, because you can’t unless they provided the friction loss characteristics of the barrel, which they don’t.
Mike Morey CFPS 3229 • NICET S.E.T. 123677 Project Estimator • Fire Protection Group Shambaugh & Son, LP an EMCOR Company 7614 Opportunity Drive • Fort Wayne, IN • 46825 direct 260.487.7824 / cell 260.417.0625 email mmo...@shambaugh.com<mailto:mmo...@shambaugh.com> 24/7<outlook-data-detector://2/> SERVICE LINE 888.217.7055<tel:888.217.7055> [cid:image001.jpg@01DB9E67.551FF760] From: Mike Stewart <fireprotectiondesi...@gmail.com> Sent: Wednesday, March 26, 2025 3:47 PM To: sprinklerforum@lists.firesprinkler.org Cc: sprinklerforum@lists.firesprinkler.org Subject: [Sprinklerforum] Re: Dry Sprinkler K-Factor Since the connection point has a large opening and the “K Factor” has to do with the smaller opening size of the fire sprinkler itself then the “K Factor” should be added at the fire sprinkler head itself. Mike Stewart (843) 490-8366 On Mar ZjQcmQRYFpfptBannerStart This Message Is From an Untrusted Sender You have not previously corresponded with this sender. ZjQcmQRYFpfptBannerEnd Since the connection point has a large opening and the “K Factor” has to do with the smaller opening size of the fire sprinkler itself then the “K Factor” should be added at the fire sprinkler head itself. Mike Stewart (843) 490-8366 On Mar 26, 2025, at 12:44 PM, Fpdcdesign <fpdcdes...@gmail.com<mailto:fpdcdes...@gmail.com>> wrote: The K factor has to do with discharge, so it should be applied at the sprinkler, unless noted otherwise by the manufacturer. If they are to be taken at the POC, then the K factor would be modified per length of sprinkler in the literature. Kind of like how Autosprink does it. Todd Williams Fire Protection Design/Consulting Stonington, CT 860-608-4559 On Mar 26, 2025 at 12:20 PM, <Travis Mack<mailto:t.m...@mepcad.com>> wrote: Is the k-factor for a dry sprinkler to be applied at the sprinkler, or at the point of connection to the piping network? I understand things like the Victaulic Dry Flex sprinkler have the k-factor at the POC. What about all other dry sprinklers? POC or sprinkler orifice? Travis Mack, SET M.E.P.CAD | Instructor / Support 181 N. Arroyo Grande Blvd. #105 I Henderson, NV 89074 www.mepcad.com<https://urldefense.com/v3/__http:/www.mepcad.com/__;!!FaxH778!aAr-BkS_1pr4Jp9Gp4ZtcIhC2_FapjVhkuMCZdanJM6V-DHq1nmjZZUgGYgYo70L_RD_dD7ehLjrYcwNzBikSa46_l4$> | 303-923-8215 Email: t.m...@mepcad.com<mailto:t.m...@mepcad.com> AutoSPRINK | AutoSPRINK FAB | AutoSPRINK RVT | AlarmCAD Academy of Fire Sprinkler Technology | Director, Engineering Technology 101 S Main Street, Suite 001, Decatur, IL 62523 _________________________________________________________ SprinklerForum mailing list: https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org<https://urldefense.com/v3/__https:/lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org__;!!FaxH778!aAr-BkS_1pr4Jp9Gp4ZtcIhC2_FapjVhkuMCZdanJM6V-DHq1nmjZZUgGYgYo70L_RD_dD7ehLjrYcwNzBikMMXNN9A$> 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<https://urldefense.com/v3/__https:/lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org__;!!FaxH778!aAr-BkS_1pr4Jp9Gp4ZtcIhC2_FapjVhkuMCZdanJM6V-DHq1nmjZZUgGYgYo70L_RD_dD7ehLjrYcwNzBikMMXNN9A$> To unsubscribe send an email to sprinklerforum-le...@lists.firesprinkler.org<mailto:sprinklerforum-le...@lists.firesprinkler.org> This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and all copies of it from your system, destroy any hard copies of it and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient.
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