NFPA 13 (2016 Section 7.1.2 or 2019 Section 30.3.1) requires a relief valve on all wet pipe systems. The only exemption is where air reservoirs are installed to absorb pressure increases, then a relief valve isn't required.
This seems straightforward but I don't recall seeing independent relief valves on the far majority of the wet pipe systems I've come across. How is this requirement typically met from a design standpoint? Am I missing something or looking in the wrong place?
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