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A sprinkler system employs automatic sprinklers attached to a piping system containing water and connected to a water supply so that water discharges immediately when a head opens. What is this called?
In a wet pipe system, the piping is always filled with water under pressure. When a sprinkler head is triggered by heat, water is discharged immediately. This is the most common sprinkler system for general buildings.
Dry pipe: Pipes contain air or nitrogen; water enters only after valve activation.
Deluge: Pipes are empty, and all heads open simultaneously, releasing water everywhere.
Pre-action: Pipes are dry until detection and valve activation; reduces accidental discharge risk, recommended for IT rooms.
Since the definition describes immediate discharge from water-filled pipes, this is a wet pipe system.