Preaction

Preaction

Systems

Preaction Systems are most frequently used to protect against accidental water discharge, or to speed the action of large dry pipe systems. Common installations include computer rooms, process control rooms, libraries, and freezers. Preaction Systems often compliment a gas-based extinguishing system. The Single-Interlocked Preaction System shown requires activation of the detection system before allowing water to flow into the closed sprinkler system piping. This helps prevent unwanted water flow when a pipe or sprinkler is accidentally broken. Activation of both the detection system and a sprinkler will allow water to flow into the hazard being protected. Double-Interlocked Systems require activation of both the detection system and a sprinkler before allowing water to flow into the sprinkler system piping. This configuration provides even more protection against accidental discharge of water.