Selected flammable-liquid hazards, test and process enclosures, machinery enclosures, and similar special hazards require project-specific evaluation of the fuels present, enclosure conditions, ignition sources, occupancy, ventilation, shutdown sequence, piping constraints, and the listed capabilities of the specific system.
FK-5-1-12 is not universally applicable to flammable-liquid or special hazards. Suitability depends on the fuel characteristics, the quantity and arrangement of fuel, enclosure conditions, ignition and reignition sources, occupancy, ventilation, applicable codes, the listed capabilities of the specific system configuration, and Authority Having Jurisdiction requirements.
These examples are illustrative and are not a statement that FK-5-1-12 is suitable for a particular hazard. Each hazard requires fuel-specific design review against the listed capabilities of the specific system.
Flammable liquids differ in the agent concentration needed to extinguish them. Design for a Class B hazard must be based on the specific fuels present and on the design methods and listed capabilities of the specific system configuration. A design that suits one fuel does not automatically suit another.
Hot surfaces, continuing fuel flow, and other reignition sources must be addressed through fuel shutoff, equipment shutdown, cooling time, and other measures coordinated with the system operating sequence.
FK-5-1-12 is not presented as protection for every special hazard. It is not used on fires involving:
Hazards outside the listed and application limits of the specific system configuration require a different protection approach. The suppression system does not replace fuel containment, ventilation, process safety systems, ignition-source control, or other required safeguards.
Total-flooding protection depends on the ability of the protected enclosure to establish and maintain the required agent concentration for the applicable design period. Openings, ventilation and exhaust systems, doors, access panels, penetrations, pressure effects, and leakage paths must be evaluated as part of the project design.
Ventilation and exhaust shutdown, fuel and process shutdown, damper operation, door position, pressure-relief venting, and post-discharge ventilation must be coordinated with the system operating sequence and applicable requirements.
FK-5-1-12 is an engineered total-flooding clean-agent system that may be considered for evaluated flammable-liquid and special-hazard enclosures where the fuels present fall within the listed capabilities of the specific system configuration, and where enclosure conditions, design criteria, electrically non-conductive protection, no suppression-agent residue, available storage space, operating requirements, and configuration-specific approval requirements support its use.
FK-5-1-12 suppresses fire primarily through chemical interference with the combustion process, combined with heat absorption.
Final suitability requires project-specific review using the current controlled system documentation.
Approval and certification status varies by system configuration, including container size, working pressure, component, arrangement, and jurisdiction. Approval of one configuration does not automatically extend to another.
