Ad
related to: aqueous film forming foam extinguisher for electrical work at home
Search results
Results from the WOW.Com Content Network
In general, it is better than protein foam because its longer blanket life provides better safety when entry is required for rescue. Fluoroprotein foam has fast knockdown characteristics and it can also be used together with dry chemicals that destroy protein foam. In the mid-1960s, the US Navy developed aqueous film-forming foam (AFFF).
APW extinguishers are commonly converted into makeshift CAFS extinguishers by drilling two 1.6–3.2 mm (1 ⁄ 16 – 1 ⁄ 8 in) holes in the pickup tube. The unit is then filled with 5.7 litres (1.5 US gal) of water and Class A foam, aqueous film forming foam (AFFF), film-forming fluoroprotein (FFFP) or commercial detergent is added to the water in a 1% ratio for class A fires and a 3–6% ...
Aqueous film-forming foam (AFFF) (pronounced "A-Triple-F", also called "Class B"): bubbles that act as surfactant to coat and penetrate ordinary fuels (e.g., wood, paper) to prevent them from burning at normal temperatures; also used on "Class B" (oil/gasoline) fires to spread a non-volatile film over the surface of the fuel.
The material, known formally as aqueous film-forming foam, or AFFF, was developed in the 1960s to fight extremely hot, dangerous fires started by flammable liquids.
Specifications of fire extinguishers are set out in the standard AS/NZS 1841, the most recent version being released in 2007. All fire extinguishers must be painted signal red. Except for water extinguishers, each extinguisher has a coloured band near the top, covering at least 10% of the extinguisher's body length, specifying its contents.
Purple-K, also known as PKP, is a dry-chemical fire suppression agent used in some dry chemical fire extinguishers. [1] It is the second most effective dry chemical in fighting class B (flammable liquid) fires after Monnex (potassium allophanate), and can be used against some energized electrical equipment fires (USA class C fires). [2]
Because of this, Class A fire extinguishers use water, while Class B fire extinguishers use dry chemicals (foam or powder), [5] such as aqueous film-forming foam, multi-purpose dry chemicals such as ammonium phosphate, and halogenated agents (such as Halon 1301 and Halon 1211) [8] or highly pressurized carbon dioxide. [5]
That fire-extinguishing medium is not stored "as is" but rather produced "on demand": the aerosol microparticles and effluent gases are generated by an exothermic reaction initiated within a condensed, solid, aerosol-forming compound. [2] Typically, a fuse ignites the aerosol-forming compound to generate hot aerosol colloids.
Ad
related to: aqueous film forming foam extinguisher for electrical work at home