I have a horizontal split-case fire pump, with suction taken from the header. The distance from the flange of the tee to the pump flange maintains the minimum 10-pipe-diameters as required by NFPA 20.
However, is the 10-pipe-diameters measured from the flange of the gate valve (OS&Y vale) or from the flange of the tee?
I received a comment from a consultant that stated the 10-diameters is to be measured from the OS&Y gate valve flange.
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