A fire protection water supply layout features a post indicator valve and riser equipped with a tamper switch connected to the fire alarm system, alongside a 90-degree Siamese fire department connection with a four-inch by two-and-a-half-inch by two-and-a-half-inch configuration. An inline check valve and a wafer type check valve or quick check are installed along the piping run, with a concrete access vault measuring twenty-four by thirty inches placed over the check valve extensions. The post indicator valve sits on a concrete thrust block with valve restraint at finished grade, requiring a three-foot clear minimum and an unobstructed three-foot radius working clearance around both the post indicator valve and the fire department connection. Height dimensions vary from thirty-two to forty-two inches per NFPA 24-6.3.1 for the post indicator valve and eighteen to forty-eight inches maximum per NFPA 24-A.5.9 for the fire department connection above finish grade. Above grade pipe is specified as galvanized and below grade pipe as ductile iron, supplemented by a metal sign with raised letters at least one inch high indicating auto sprinklers building per California Building Code Section 912.4.
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