The double-interlock pre-action sprinkler system is suitable for use in areas where water discharge due to an accident would cause serious damage. This system type minimizes the possibility of accidental discharge as water enters the pipe system only if two independent events occur. The activation method is determined based on the detection system option suitable for use in the area. The activation method can be pneumatic/pneumatic, pneumatic/electric, or electric/electric.
For non-interlock and single-interlock pre-action systems, the system size should be determined so that up to 1000 sprinklers can be controlled from the same pre-action alarm valve.