proceed with caution least you own the responsibility for something that might leave a bad taste. This isn’t really defined by NFPA 13 so what is your basis? The industry use to be (often still is) a little casual about extending the age old guidance from NFPA 101 allowed ONLY for atrium glass to any and all glass. Even there it does say the ENTIRE glass shall be wetted. It was amusing that a couple of cycles ago NFPA 80A simply required a Water Curtain for exterior exposure protection. That would work well on a 4 story structure. 13 refined it’s exposure protection criteria and part of that was to address run down and associated ledges and mullions. It allows rather large protrusions but the exposure will be different than an interior fire (so don’t casual embrace the sizes it states). The Tyco WS sprinkler is rather particular about mullions too. Sounds like a common thread not to be lightly ignored.
So what level of insurance do you have for performing engineering since it is not prescriptively defined by NFPA 13? If the architect wants it, let them design/stamp it. Roland Roland Huggins, PE - VP Engineering American Fire Sprinkler Assn. --- Fire Sprinklers Saves Lives Dallas, TX http://www.firesprinkler.org <http://www.firesprinkler.org/> > On Sep 2, 2015, at 4:25 AM, Gregory Lindholm <[email protected]> wrote: > > We have a new school that has a three story atrium, and the Architect is > asking for us to protect the third floor glass with sprinklers place a > maximum of 6' on center, and not more than 12" off the glass. > I originally assumed that we would use the Tyco Window Sprinklers, but the > windows on this project has multiple horizontal mullions in the windows (4 or > 5).lowed with the Tyco heads. > I was thinking of just deigning it as a Water Curtain, with the regular heads > at 6' on center, with 3 gpm per lineal foot. > Thoughts? > > Greg Lindholm > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
