I think Todd is right too. No different than finding the spacing of a head next to the wall. Use the greater distance of either 2x the distance of the head off the wall or the spacing between that head and the next head in the line.
Thank you, Dewayne Martinez Fire Protection Design Manager TOTAL Mechanical Building Integrity W234 N2830 Paul Rd. Pewaukee, WI 53072 [email protected]<mailto:[email protected]> Ph: 262-522-7110 Cell: 414-406-5208 http://www.total-mechanical.com/ [cid:[email protected]] From: John Denhardt <[email protected]> Sent: Thursday, March 21, 2024 6:15 PM To: Discussion list on issues relating to automatic fire sprinklers <[email protected]> Subject: [Sprinklerforum] Re: Multiple sprinkler spacings Todd - I'm with you. I was taught each sprinkler has to be individually checked and verified. We use the actual spacing per sprinkler for hydraulic calculation purposes, 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 AFSA, and/or 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. Thanks, John [https://www.dropbox.com/s/g4h8r7hdtsr6154/AFSA_L.png?raw=1] John August Denhardt, PE Vice President, Engineering and Technical Services American Fire Sprinkler Association m: p: 301-343-1457 214-349-5965 ext 121 w: firesprinkler.org<https://link.edgepilot.com/s/a7a93a02/x2dwAiEI-0KnGtpXRcTBsQ?u=http://firesprinkler.org/> Treat Your Apprentices Like VIPs! AFSA’s Virtual Instruction Program (VIP) for Apprentices is training that comes straight from our expert instructors. They lead the way to ensure your men and women are trained, letting you focus on OJT. Click here<https://link.edgepilot.com/s/d7ee130c/k1KQjqAq70SM3epPrGJS6w?u=https://www.firesprinkler.org/sprinkler-apprentice-training/> to learn more and enroll. On Thu, Mar 21, 2024 at 4:58 PM Fpdcdesign <[email protected]<mailto:[email protected]>> wrote: I am working on a project which is a retail store being renovated for a new tenant. The previous retail tenant had been in the space for at least 20 years. The existing sprinklers below the ceiling (to remain) are spaced at 10 ft in one direction and alternate 10 ft and 14 ft (10-14-10-14…) in the other. I made the comment that the sprinkler spacing exceeds the 130 max requirement of NFPA 13 and it needs to be modified. The architect (and his “value engineer”) decided that 1/2 the distance on one side is 7 ft and on the other side is 5 ft, which equals 12, times 10 ft in the other direction equals 120 sqft and all is fine. The Fire Marshal is kind of buys into it because he is new and his department blew it 20 years ago. Unfortunately 13 doesn’t address their being to possibility of different spacings between sprinklers (such as ‘maximum’ distance between sprinklers when determining S and L). Any thoughts, ideas or references I am missing as I walk into this battle? Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT 860-535-2080<tel:860-535-2080> (ofc) 860-554-7054<tel:860-554-7054> (fax) 860-608-4559<tel:860-608-4559> (cell) _________________________________________________________ SprinklerForum mailing list: https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org<https://link.edgepilot.com/s/e919d08a/XJKcGQovaUCZTzxIawXb5A?u=https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org> To unsubscribe send an email to [email protected]<mailto:[email protected]>
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