I'm old now so you get a story first, probably with a divergence (and there it is already and again), but Grinnell made a sprinkler that had different K-factors depending on the height it was placed at (9.0, 9.2, 9.4, etc.). An AHJ once called me out for using 9.0 in a calculation whose height fell into the 9.4 range. That;'s where he had stopped reading because the following paragraph in that datasheet said to always use 9.0 in the calculations. Once I pointed that out to him all was good. Similarly, I recall (and I have no reference material to check) someone (likely Grinnell or Tyco) had/has a sprinkler that is QR to a certain height and SR when higher. You might want to check. Problems don't always have solutions that are obvious, simple, and wrong. Sometimes the right answer is simple if not obvious.
On Mon, Sep 26, 2022 at 10:05 AM cw bamford <cwbamf...@gmail.com> wrote: > NFPA 13 2019 edition > 9.4.3 - 9.4.3.6 > > handbook also has some comments > FAQ > 9.4.3.2 > > Chuck Bamford SET > > > > On Mon, Sep 26, 2022 at 9:43 AM Fpdcdesign <fpdcdes...@gmail.com> wrote: > >> I am working on to an addition to an existing system that has Tyco EC-11 >> pendent sprinklers. According to the data sheet, these sprinklers may be QR >> in some circumstances and SR in others. The addition I am working on will >> be using standard coverage sprinklers. The space is open to the area with >> the EC-11 sprinklers but separated by a deep soffit. The design of the >> EC-11 is such that they are considered standard response by the listing. >> The obvious question is QR or SR for the new sprinklers? I am assuming QR >> because that is closer to the response time of the EC-11s despite the SR >> listing, but I am being questioned on this. Thoughts? >> >> Todd G Williams, PE >> Fire Protection Design/Consulting >> Stonington, CT >> 860-535-2080 (ofc) >> 860-554-7054 (fax) >> 860-608-4559 (cell) >> >> _________________________________________________________ >> SprinklerForum mailing list: >> >> https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org >> To unsubscribe send an email to >> sprinklerforum-le...@lists.firesprinkler.org > > > _________________________________________________________ > SprinklerForum mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to > sprinklerforum-le...@lists.firesprinkler.org
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