As long as it has gate valves and not butterfly valves, then I think 10 pipe diameters is all you need.
I’m curious about what makes the fire pump “untestable”. -Kyle M From: Fpdcdesign <[email protected]> Sent: Tuesday, June 24, 2025 7:45 AM To: Sprinklerforum <[email protected]> Subject: [External][Sprinklerforum] Backflow turbulence I am working on an untestable fire pump with an “N” shaped RPZ in the suction line. They (just) have the 10X diameter distance on the feed, but the suction pressures are very low (15 psi). It seems that an “N” shaped device would create a lost more turbulence than a standard straight one. Consequently, should the distance of straight pipe requirement be greater for this arrangement? Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT 860-535-2080<tel:860-535-2080> (ofc) 860-554-7054<tel:860-554-7054> (fax) 860-608-4559<tel:860-608-4559> (cell)
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