Hi forumites, As per NFPA 14, in a combined standpipe/sprinkler system, the minimum pressure at the outlet of most remote 1 1⁄2 in. hose station should be 65psi. As standpipe and sprinkler riser in shared, I want to reduce the pressure to the sprinklers to around 15psi in order to reduce the total sprinklers flow demand and finally to select a smaller fire pump.
What is the most cost-effective way to do that? Can I use a restrictor? For example, if the main sprinkler pipe at each floor is 3", can I install a short 1" pipe just at the beginning to reduce sprinklers pressure. Can I do that? I checked this in a hydraulic calculation software and in works fine, but I am not sure if this is a right way. Best, Reza www.sarian.ir
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