If it’s not a listed installation, then it sounds like you are diving into the depths of an equivalent system approach compared to a listed window sprinkler system approach. There is a lot of testing that goes into developing the listed window sprinkler system (I’m sure someone in the forum can enlighten us all), and if you haven’t “pigeonholed” the listed approach, you have your hands full. And not to put a damper on things, the sprinkler spray pattern, in my opinion, is a moot point, as I have no doubt that any standard sprinkler positioned near and directed toward a window would provide acceptable wetting of the glazed surface.
Regards,Sean Conlin On Wednesday, April 25, 2018, 12:02 PM, John Paulsen <[email protected]> wrote: <!--#yiv0448437575 _filtered #yiv0448437575 {font-family:"Cambria Math";panose-1:2 4 5 3 5 4 6 3 2 4;} _filtered #yiv0448437575 {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;}#yiv0448437575 #yiv0448437575 p.yiv0448437575MsoNormal, #yiv0448437575 li.yiv0448437575MsoNormal, #yiv0448437575 div.yiv0448437575MsoNormal {margin-top:0in;margin-right:0in;margin-bottom:8.0pt;margin-left:0in;line-height:106%;font-size:11.0pt;font-family:"Calibri", sans-serif;}#yiv0448437575 a:link, #yiv0448437575 span.yiv0448437575MsoHyperlink {color:#0563C1;text-decoration:underline;}#yiv0448437575 a:visited, #yiv0448437575 span.yiv0448437575MsoHyperlinkFollowed {color:#954F72;text-decoration:underline;}#yiv0448437575 span.yiv0448437575EmailStyle17 {font-family:"Calibri", sans-serif;color:windowtext;}#yiv0448437575 .yiv0448437575MsoChpDefault {font-family:"Calibri", sans-serif;} _filtered #yiv0448437575 {margin:1.0in 1.0in 1.0in 1.0in;}#yiv0448437575 div.yiv0448437575WordSection1 {}--> Good Day Fellow Forumites! I have been trying to deal with a local code authority with regard to an “alternative” use for automatic sprinklers and I have run up against an obstacle that I would like to get the forum’s opinion on what approaches or methods can be used to satisfy the plan reviewer. The Situation: We are dealing with an existing 4 story inner city apartment renovation. The building has been gutted and refurbished into a new residential (R-2) occupancy. The building is protected by a new 13R sprinkler system supplied by municipal water. Pretty much standard up to this point. The building has an exterior fire escape structure that utilizes the existing double hung windows as points of egress from the apartments. These windows are protected by individual sprinklers mounted at the center of each window with the deflector no more than 2” above the window opening. These K 5.6 heads are calculated to flow 20 GPM at 15 PSI. The thought process behind this is that the sprinkler, when activated, will protect the window glass and preserve the path of egress for the tenants trying to leave the structure. We have designed several of these projects over the last two years and I have a standard detail block that I put on each drawing that shows the spray pattern of the sprinkler, mounting detail, a letter from the manufacturer’s PE detailing the test procedure that was used to determine the sprinkler spray pattern and a reference to NFPA-13, 2016, Section 23.3.7.1. This detail has satisfied the plan reviewers for months, but now they a requiring a letter from an FPE (YES, not a PE) or the manufacturer saying the sprinkler will “provide 100% wetting of the glazing surface”. As you can imagine, in our law suite happy land, the manufacturer is reluctant to write this letter and I don’t know any FPE’s that I can ask to write such a letter or if they would laugh me off the phone if I did. Has anyone else dealt with this type of issue and if so, HOW!? Thanks, John Paulsen – SET Crown Fire System Design 6282 Seeds Rd. Grove City, OH 43123 P – 614-782-2438 F – 614-782-2374 C – 614-348-8206 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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