pre action sprinkler system

  • Pipes are not filled with water
  • All sprinkler heads are of the standard type (they are closed),
  • A detection device opens a water valve
  • Water fills the pipes
  • Water only flows from a sprinkler head if it is opened by heat from a fire,
  • Water flows until shut off and system is reset
  • Used primarily to protect property where water could severely damage facilities or equipment, (historical items)

Pipes in protected area are empty; a detector signal triggers the system, allowing water to enter pipes and flow into piping network; heat from a fire may then open a sprinkler head; accidental damage to a head will not result in water flow

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