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NOTE: This is an unformatted excerpt from our online fire protection training library.

Supervisory Initiating Devices

sprinkler systems

The are four basic types of automatic sprinkler systems.

Wet-pipe sprinkler systems are the most common type of system. As the name implies, the wet-pipe system has water in the piping at all times.

Dry-pipe sprinkler systems have compressed air in the piping. The compressed air is used to hold the dry-pipe valve closed until a fire fuses a sprinkler head.

A deluge sprinkler system has all open sprinkler heads. When a supplemental fire detection system actuates, the deluge valve opens allowing water to discharge from all the open heads. This is the way many people think all sprinkler systems operate. In reality, only a very small percentage of sprinkler systems are deluge systems.

A preaction sprinkler system is a deluge system that has closed sprinkler heads. A fire must actuate a supplemental fire detection system which opens the preaction valve. This action floods the sprinkler piping with water, but it is not discharged because of the closed sprinkler heads. When the fire fuses a sprinkler head water is discharged only from that particular head.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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