Preaction Systems

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A preaction system is typically installed in areas where water in the area is a last resort.  The most typical installation of a preaction system is in a computer or server room. This type of system is tied directly into an underground water supply or downstream of the buildings wet system.  Most preaction systems maintain air pressure in the piping for supervisory reasons.  This system requires at least one prior event/activation before water is introduced into the piping.  The most typical activation is a smoke detector which will send a signal to the preaction valve and activate water flow.  At this point a sprinkler head will still need to activate in order to disperse water into the area.

An ANNUAL preaction system inspection consists of testing/inspecting the following components:

  • Water flow alarms
  • Control valve tamper switch alarms
  • Supervisory air
  • Mechanical activation of preaction valve
  • Main drain flow
  • Fire department connection
  • Stock of spare heads
  • Sprinkler heads and piping
  • Sprinkler coverage

A RISER or QUARTERLY preaction system inspection consists of testing/inspecting the following components:

  • Water flow alarms
  • Control valve tamper switch alarms
  • Supervisory air
  • Main drain flow
  • Fire department connection
  • Stock of spare heads