fire sprinkler main and backflow devise.

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by LBJAMES, Jun 21, 2011.


    LBJAMES New Member

    Dec 19, 2009
    I have a customer that needs a 3" water service for a fire sprinkler system with a backflow devise. not sure what backflow devise or type of pipe to use.
  2. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona
    They usually use a double check with rising stem gate valves. IT must be approved for that application by the proper testing bureau. The double check is installed ABOVE the ground at the required elevation, with the proper supports and bracing. Your fire department should have descriptions of the REQUIRED installation standards. BUT, why are YOU installing it? The fire sprinkler companies usually REQUIRE that they install it themselves, if for no other reasons than liability and performance.
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