CO2 Deluge System
CO2 (carbon dioxide) is a very effective extinguishing agent and works by reducing oxygen levels to a point where combustion cannot take place. When activated, automatic CO2 fire extinguishing systems are designed to deluge an area within seconds. Typical installations include turbine/generator enclosures, plenum chambers, archives or any other enclosed area rarely occupied. These areas are only ever typically visited for the purposes of inspection, maintenance or repair. If a person becomes trapped, they may quickly suffocate.
Safe practice requires an arrangement which prevents casual or unauthorized access into a (CO2) protected space and offers a permanent emergency exit option. Safety arrangements should ensure that all doors and access hatches remain locked during periods of normal operation and that access to protected areas are controlled and authorized only by appointed personnel. SFC interlock systems allow access only under the strictest conditions. Entry for inspection or maintenance purposes is only possible by the issue of an initiating ‘permit key’ by the appointed authority. This key may be used to activate visual or audible alarms which denote ‘work in progress’ and / or the release of secondary key(s) which enable isolation of the CO2 supply. Based on a key exchange principle, further keys are released, which enable unlocking of the access door(s) and permit the entry for a worker(s).
While work is undertaken, the CO2 supply is isolated and the worker(s} cannot be locked in. However, to ensure total worker safety, each interlocked access door within the system is fitted with a failsafe emergency override escape mechanism, which permits a worker to strike a panic button or crash rail that mechanically overrides the door latch mechanism.