Twin-agent fire extinguishing system

A twin-agent fire extinguishing system (TAFES) incorporates the benefits of dry chemical and foam (AFFF or CAFS). Most commonly used for AR-FF operations and in industrial areas with high class B hazards.

The dry chemical usually Purple-K (and in some applications ABC Dry Chemical) 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 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 off vehicles(i.e. AR-FF vehicles) or ground mounted monitors in high hazard locations in facilities storing or producing flammable liquids. See Airport crash tender

Dry chemical tank capacities range from 450 to 3000 pounds. AFFF solution capacity ranges from 50 to 250 gallons. Dry chemical flow rates vary from 5 to 8 lb per second and 35 to 60 Gallons per minute for the foam for handline application.

References

This article is issued from Wikipedia - version of the Sunday, April 06, 2014. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.