In Class I standpipes, I commonly see a pair of hose valves installed at the top landing (or intermediate landing) - One immediately below the other.
Is this an incorrect derivative of the requirement to calculate the two most remote outlets (at 500 gpm), or something that was required in a previous edition of NFPA #14, or is this merely a regional practice that is a result of the shared DNA of my regional contractors?
I thought I had seen an informal interpretation regarding this, but I cannot find it again. NFPA Figures do not appear to support this double-valve arrangement.
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