12:04 Dec 10, 2004 |
French to English translations [PRO] Tech/Engineering - Construction / Civil Engineering / fire prevention | |||||||
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| Selected response from: Bourth (X) Local time: 03:55 | ||||||
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4 +1 | Can't imagine anything else |
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sprinklers dopés Can't imagine anything else Explanation: Three foam concentrates used to control or suppress flammable or combustible liquids fires are: Aqueous Film Forming Foam (AFFF), Film Forming Fluoroprotein (FFFP), and Alcohol-Resistant Foam Concentrates (ARC). AFFF concentrates are based on fluorinated surfactants plus foam stabilizers and usually are diluted with water to a 1%, 3% or 6% solution. The foam acts as a barrier both to exclude air or oxygen and to develop an aqueous film on the fuel surface that can suppress the evolution of fuel vapors on most hydrocarbon fuels. FFFP concentrates use fluorinated surfactants to produce a fluid aqueous film for suppressing hydrocarbon fuel vapors. This type of foam uses a protein base plus stabilizing additives and inhibitors to protect against freezing, corrosion, and bacterial decomposition. This foam is usually diluted with water to a 3% or 6% solution. ARC concentrates are used on water-soluble fuels (e.g., polar solvents) that are destructive to regular AFFF, or FFFP foams, as well as for fires involving some hydrocarbons. ARC foam concentrates are generally used in concentrations of 3% to 10%, depending on the nature of the hazard to be protected and the type of concentrate. [http://www.verlan.com/Newsletter/May_1999.htm] |
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