Wet Pipe System

A combination dry pipe/wet pipe system. The system exists as a dry pipe until the initial stages of a fire (smoke, heat, and so on) are detected and then the pipes are filled with water. The water is released only after the sprinkler head activation triggers are melted by sufficient heat. If the fire is quenched before the sprinklers are triggered, the pipes can be manually emptied and reset. This also allows for manual intervention to stop the release of water before sprinkler triggering occurs. Preaction systems are the most appropriate water-based system for environments that include both computers and humans in the same locations.
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A fire suppression system that contains compressed air. Once suppression is triggered, the air escapes, which opens a water valve that in turn causes the pipes to fill and discharge water into the environment.
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See wet pipe system.
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Another form of dry pipe (fire suppression) system that uses larger pipes and therefore a significantly larger volume of water. Deluge systems are inappropriate for environments that contain electronics and computers.
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Environment providing sufficient assurance that applications and equipment are protected against the introduction of malicious logic during an information system life cycle. Closed security is based upon a system’s developers, operators, and maintenance personnel having sufficient clearances, authorization, and configuration control.
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