Twin-agent fire extinguishing system
A twin-agent fire extinguishing system, also commonly referred to as a twin-agent unit, incorporates the benefits of dry chemical and foam fire extinguishing agents. It is most commonly used for AR-FF operations and in industrial areas with high class B hazards.
The dry chemical, usually Purple-K, knocks down the fire rapidly, while the foam secures the hazard by laying a vapor-suppressing blanket on the fuel and helping to cool the fuel in skin fires. In pressurized gas fires the foam is applied to extinguish the fuel fires around the blowout and cool heated metal. The Purple-K stream is then discharged into the blowout to "snuff" it out.
These systems can be mounted on vehicles, skid mounts or installed as permanent stations. Application is from twin hose lines connected together at the nozzle, one flows the dry chemical agent and the other foam. Twin agent systems are also used in fixed nozzles of vehicles or ground mounted monitors in high hazard locations in facilities storing or producing flammable liquids.
Dry chemical tank capacities range from. AFFF solution capacity ranges from. Dry chemical flow rates vary from per second and per minute for the foam for handline application.