Have you gone through the section in Chapter 8 of NFPA 13 regarding the various clearance rules with regards to horizontal obstructions?
Like I said in a previous post, the 48” rules isn’t the only rule regarding obstructions. When you start looking at the horizontal distance and vertical distances of obstructions to sprinklers a situation could be considered obstructed with something less than 48”. 8.6.4 in the 2013 NFPA 13 begins the section on deflector positions and obstructions of various types and orientations of sprinklers and it continues on through section 8.12. Craig L. Prahl Fire Protection Group Lead/SME CH2M 200 Verdae Blvd. Greenville, SC 29607 Direct - 864.920.7540 Fax - 864.920.7129 CH2MHILL Extension 77540 [email protected] From: Sprinklerforum [mailto:[email protected]] On Behalf Of Brian Harris Sent: Thursday, January 12, 2017 10:59 AM To: [email protected] Subject: RE: Funky Wavy Soffit [EXTERNAL] Ron- You could certainly say these are more of a “cloud” than a soffit as they do not extend to the deck. With that being said what are your thoughts on heads below them? Brian Harris, CET BVS Systems Inc. bvssytemsinc.com<http://bvssystemsinc.com/> From: Sprinklerforum [mailto:[email protected]] On Behalf Of rongreenman . Sent: Thursday, January 12, 2017 10:47 AM To: [email protected]<mailto:[email protected]> Subject: Re: Funky Wavy Soffit That said wouldn't the soffit rule apply for max distance from the edge of the soffitt if it extends up to the main ceiling or, as your question seems to imply to me, " The top of this soffit is approximately 5’0” below the overhead sprinklers...." it sounds more like a cloud abutting a wall than a soffit. I don't think the 48" rule applies at all. On Thu, Jan 12, 2017 at 7:43 AM, rongreenman . <[email protected]<mailto:[email protected]>> wrote: I think that whenever someone posts a reference number and doesn't include the text or at least the edition he should be severely beaten. On Thu, Jan 12, 2017 at 6:24 AM, Brian Harris <[email protected]<mailto:[email protected]>> wrote: We have a grocery store that has a wavy kinda soffit (see dropbox file link below) around the perimeter of most of the store. The top of this soffit is approximately 5’0” below the overhead sprinklers & is less than 48” at the widest points. With that being said are additional heads needed in this lower soffit? In my opinion 8.6.5.2 would not apply since the pattern development is not affected so the next stop would be 8.6.5.3. The only thing that stands out to me there would be the 48” width we I do not have. So I say no additional heads needed below, what say you? https://www.dropbox.com/s/3klcgh37fhowmp8/Wavy%20Soffit.pdf?dl=0 Brian Harris, CET BVS Systems Inc. Design Manager bvssystemsinc.com<http://bvssystemsinc.com/> Phone: 704.896.9989<tel:(704)%20896-9989> Fax: 704.896.1935<tel:(704)%20896-1935> _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org -- Ron Greenman [email protected]<mailto:[email protected]> 253.576.9700<tel:(253)%20576-9700> The Universe is monstrously indifferent to the presence of man. -Werner Herzog, screenwriter, film director, author, actor and opera director (1942-) -- Ron Greenman [email protected]<mailto:[email protected]> 253.576.9700 The Universe is monstrously indifferent to the presence of man. -Werner Herzog, screenwriter, film director, author, actor and opera director (1942-)
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