My experience has been that wood structures often cant handle the lateral loading for mains, but if you longitudinally brace the branch lines the branch lines can be omitted from the laterally loads for the mains. NFPA 13 (13 ed.) 9.3.5.9.6 The zone of influence for lateral braces shall include all branch lines and mains tributary to the brace, except branch lines that are provided with longitudinal bracing or as prohibited by 9.3.5.9.6.1.
I dont know if this is whats going on or not, only presuming it. As far as your original question, Jerry, I would say that yes you can cross the plane of the airplane and achieve the proper spacing. Thank you, Bob Knight, CET III Fire by Knight, LLC 208-318-3057 From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org] On Behalf Of Parsley Consulting via Sprinklerforum Sent: Thursday, August 08, 2019 3:55 PM To: sprinklerforum@lists.firesprinkler.org Cc: Parsley Consulting; jvankol...@mfpc.us Subject: Re: Can a Branchline cross the main when Bracing Jerry, I have to admit I'm a bit confused. Why are you longitudinally bracing branch lines? That certainly isn't required by NFPA 13. Per §9.3.5.6.1 of the '16 edition, longitudinal bracing is only required for feed and cross mains. As I am a member of the hanging and bracing committee, please see the disclaimer below. sincerely, Ken Wagoner, SET Parsley Consulting 350 West 9th Avenue, Suite 206 Escondido, California 92025 Phone 760-745-6181 Visit the website <http://www.parsleyconsulting.com/> IMPORTANT NOTICE: This correspondence is not a Formal Interpretation issued pursuant to NFPA Regulations. Any opinion expressed is the personal opinion of the author and does not necessarily represent the official position of the NFPA or its Technical Committees. In addition, this correspondence is neither intended, nor should it be relied upon, to provide professional consultation or services It should be noted that the above is my opinion as a member of the NFPA Automatic Sprinkler System Hanging and Bracing Committee in accordance with the NFPA Regulations Governing Committee Projects and should therefore not be considered, nor relied upon, as the official position of the NFPA or its Committees
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