Hi everyone. I am currently performing the hydraulics calculation as per NFPA 13 and NFPA 30, as the subject wet-sprinkler system is installed in an indoor liquid chemical storage area. While looking at the notes for NFPA 30 126.96.36.199.3, it says that the "sprinkler operating gauge pressure shall be a minimum 30 psi". Now my question is that are they referring to the static pressure at the sprinkler head or the stagnation (total) pressure at the sprinkler head? This is because the stagnation pressure in my case is almost twice the static pressure at that point. Any guidance is highly appreciated!
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