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# 23.4.4.10* Pressures

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When calculating flow from an orifice, the total pressure

*(P*shall be used, unless the calculation method of 23.4.4.10.2 is utilized._{t})Use of the normal pressure

*(P*calculated by subtracting the velocity pressure from the total pressure shall be permitted. Where the normal pressure is used, it shall be used on all branch lines and cross mains where applicable._{n})Flow from a sprinkler shall be calculated using the nominal K-factor except that the manufacturer's adjusted K-factors shall be utilized for dry-type sprinklers.

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