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

Introduction to Clean Agents

Summary

System Components and Sequence of Operation

The detection sub-system – consisting of photo-electric, ionization, or air sampling smoke detectors – initiates the response of a clean agent system to the presence of a fire. Upon detection, alarms are activated to cause evacuation of the protected space, the ventilation system is shut-down, and a time delay is initiated. The time delay is utilized to allow for the evacuation of the protected space to be completed. The power to operating equipment in the space maybe shut-down upon detection as well.

After completion of the time delay, the agent storage cylinders are actuated and the agent flows through a pipe network to reach the discharge nozzles and into the protected space. Flex hoses are generally utilized between the agent cylinders and the piping network to ease installation and maintenance.  Some agent systems that employ high pressure agent storage utilize a pressure reducing orifice at the end of the agent cylinder manifold to allow for the use of lower pressure rated, lower cost schedule 40 pipe downstream of the manifold.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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