Which of the following sprinklers is designed to suppress a fire in a storage warehouse rather than just control it?
K-8 spray sprinkler
K-11.2 spray sprinkler
K-5.6 spray sprinkler
Large drop sprinkler
(I thought it was answer E but would like to confirm.)
D) ESFR sprinkler
The "S" in ESFR is for "Suppression," as in "Early Suppression Fast-Response."
Note that the "S" in CMSA, is for Specific, as in "Control Mode Specific Application." That's still a control-mode head, though it performs significantly better than a Control Mode Density Area (CMDA) head - i.e. the k-5.6, k-8.0, or k-11.2.
Note that generally, you can't use a K-5.6 head for much storage, as any required density greater than 0.20 requires a k-8.0 head (or greater), and for any required density greater than 0.34, you have to use a k-11.2 head (or greater). As always there are exceptions (i.e. for existing storage systems), but generally, a k-11.2 or greater head is often required for storage applications (but not all). For reference, see NFPA 13 (2016 Edition) Chapter 12.6.1 through 12.6.5.
"Large Drop" is a legacy term when fire sprinklers were first being specifically designed for high-challenge fires (i.e. Storage). Large drop research started in the 1970s, with ELO (extra-large orifice) sprinklers coming into play in the 1980s. All of the other heads shown are control-mode sprinklers. Be aware, that NFPA 13 has been completely reorganized for the 2019 Edition, that may make your head selection easier...
I'm certain that on the Exchange there are dozens of sprinkler experts way better read into the nuance than I, and I happily defer to their knowledge should they choose to share.
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