The 1” to 6” with the maximum of 22” requirements have been with us since they introduced the obstructed construction concept in the 1991 edition of NFPA 13.
Prior to that, the requirement for beam and girder construction was for sprinklers under beams to be 1” to 4” with a maximum of 20”. Best regards, Larry Keeping From: Sprinklerforum [mailto:[email protected]] On Behalf Of Reed A. Roisum, SET Sent: April-27-18 12:48 PM To: [email protected] Subject: Concrete Pan Construction I have existing sprinklers under concrete pan (obstructed) construction that are located 22” below the deck. My concern is that the “beams” are 10” deep. That means the deflectors are not within 1-6” of the bottom of the structural member. Am I not applying the correct arrangement from NFPA 13, 2013 ed. 8.6.4.1.2? I believe (1) is the only arrangement that works for this scenario. Was the 1-6” below the bottom of the structural member added in recent years? Thank you. Reed Roisum Reed A. Roisum, SET | Karges-Faulconbridge, Inc. | Senior Fire Protection Designer | Fargo, ND | direct: 701.552.9903 | mobile: 701.388.1352 | KFIengineers.com<http://www.kfiengineers.com> ______________________________________________________________________ This email has been scanned by the Symantec Email Security.cloud service. For more information please visit http://www.symanteccloud.com ______________________________________________________________________
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