Plumbing · P-PNKFG

Roof Cistern and Alarm Float Plumbing Detail

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A 26,000-gallon cistern measures twenty-one feet long by fourteen feet wide by twelve feet high, with a minimum tank depth of one foot. The assembly includes an eight-inch smoothing inlet, an eight-inch smoothing cistern, a four-inch tank vent, and a thirty-inch manway. Internal components feature a two-inch floating filter along with high and low water alarm floats installed and supplied by the general contractor. The cistern is sized per the usable roof area and located on sheet P4.

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