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6126.96.36.199 Sprinkler Pipe Sizing Method
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The sprinkler pipe shall be sized using the prescriptive method in Section 6188.8.131.52 or by hydraulic calculation in accordance with NFPA 13D. The sprinkler pipe size from the water supply source to a sprinkler shall be not less than 3/4 of an inch (20 mm) in diameter. Threaded adapter fittings at the point where sprinklers are attached to the piping shall be not less than 1/2 of an inch (15 mm) in diameter.