Today we're breaking into floor control assemblies. The following is a full arrangement for a combination standpipe/sprinkler riser where high pressures necessitate a pressure reducing valve at each level.
While every element in this specific arrangement is certainly not a necessity on every project, here's some considerations that go into the requirements and considerations for a layout like this:
Auxiliary Drain Valve
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Joseph Meyer, PE, owns/operates his own Fire Protection Engineering practice in St. Louis, Missouri. See bio on About page.