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Firefighting foam is a foam used for fire suppression. Its role is to cool the fire and to coat the fuel, preventing its contact with oxygen, thus achieving suppression of the combustion. Firefighting foam was invented by the Moldovan engineer and chemist Aleksandr Loran in 1902. [1] The surfactants used must produce foam in concentrations of ...
Dry chemical tank capacities range from 450 to 3,000 pounds (200 to 1,360 kg). AFFF solution capacity ranges from 50 to 250 US gallons (190 to 950 L). Dry chemical flow rates vary from 5 to 8 pounds (2.3 to 3.6 kg) per second and 35 to 60 US gallons (130 to 230 L) per minute for the foam for handline application [citation needed].
This resulted in a statewide sampling plan in 2013 and 2014 to determine the scope of PFAS contamination throughout the state, specifically around WAFB. As a result, several more contamination sites were found, including a nearby McDonald's store fire that was put out with AFFF firefighting foam. [41] [66] [67]
AFFF was developed in the 1960s under Project Light Water in a joint venture between 3M and the U.S. Navy. AFFF forms a film that floats out before the foam blanket, sealing the surface and smothering the fire by excluding oxygen. AFFF is widely used for ARFF firefighting at airports, often in conjunction with purple-K dry chemical.
After testing a dry type 2 foam in several situations, Johnny Murdock notes, "The emerging consensus is that the dryer foams (type II; maybe type I) should be used to suppress vapors, protect unburned structures, build wildland fire lines involving unburned fuels; … and that structural fire suppression requires a wetter foam (type IV or type ...
PFOS is the key ingredient in Skydrol, a fire-resistant hydraulic fluid used in commercial aviation. The most important emission sources of PFOS are metal plating and fire-fighting foams. [ 25 ] Because of concerns about PFOS, F-53B has been used as a replacement for mist suppression in metal plating.
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