class a foam vs class b foam
Class B Fire Foam. The water content of the foam provides a cooling effect.
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Class A foam concentrate is a synthetic chemical additive that reduces the surface tension of water so it can penetrate combustible fuel surfaces.
. Class B foam works by creating a skinfilm over the surface of the combustible or flammable liquid separating the fuel from the air. Class B foam is similar to Class A foam in that both are mixed from concentrate but Class B foam is mixed at a higher rate of 1-6. PHOS-CHEK 3 AFFF foam is effective on hydrocarbon fuels like gasoline heptane crude oil and other fuels that are not soluble in water.
Silv-ex foam has successfully passed all toxicological studies by independent labs as required to receive USDA. Aerial Applications to be published in 199495 INTRODUCTION History Water has always been the mainstay for fire sup-pression for both wildland and structural fires. Used to extinguish Class A materials such as wood paper and brush wildland is widely used by many fire departments for structural firefighting using compressed air foam systems.
Class B foams have two major subtypes. This document is one of a series of three Foam vs Fire publications that are avail-able. When mixed with water it creates a foam solution that is more effective than plain water for flame knockdown and fuel cooling when used for a fire attack.
Many Class A foams are environmentally friendly and biodegradable when used in appropriate quantities. It has the advantage of penetrating the fuel for a quick knockdown and. Mid-Expansion of Synthetic Detergent based foam is used for suppressing haz-ardous vapors.
Low-energy input high-quality output. The Class B foam concentrate AFFF was designed for application at a concentration of 6 in an air-aspirated nozzle system and the Class A foam was designed for use at 1 concentration. Training Foam can be used with Class A or Class B foam proportioning systems.
Class A foam is used on common combustibles such as paper wood and textiles. When proportioned with water Class A concentrates reduce the solution surface tension and allow greater penetration of the foam into most Class A fuels. These are the same classes as used in identifying fire extinguishers.
This doesnt mean it isnt a valuable tool for municipal departments it just means firefighters must be aware of the hazards and know how to use Class B responsibly. Class A foam typically runs at 03 05 or 1. It is used on wildland fires and structure fires.
Nonpolar concentrates can be applied to hydrocarbons only. Qualified to USDA Forest Service 5011-307a and UL approved for use as a wetting agent for Class AB applications. Class A foam is for ordinary combustibles such as wood paper etc.
Class A Foam for Wildland Fires 3. Class B foams are designed for class B firesflammable liquids. The types of foam used by our customers can be basically broken into two categories Class A and Class B.
Departments that respond to industrial calls will likely see Class B fires more often than others. National Foams Class A Foams are also wetting agents. CHEMGUARD Class A foams cling to surfaces such as charred wood with minimal run off enhancing fire suppression and reducing water usage.
Class B Foam also called AFFF. Silv-ex foam may be used only on Class B fires involving hydrocarbon fuels and only if used with medium or high-. A compressed air foam system CAFS consists of a water source.
Effective on Class A fires High Expansion is very use-ful for confined space fire-fighting and as a wetting agent. Cient use of class A foam. This means that in our study Class A foam concentrate was used at approximately 30 strength and Class B foam was used at less than 20 strength.
The advantages of using CAFS generated Class A foam in structural firefighting are. Can I use Silv-ex foam on Class B flammable liquids. Class A Foam vs.
High Expansion can be used on small scale Class B Hydrocarbon Fires. Class B foam is used on flammable liquids. Class A foams are blend of surfactants that enable strong wetting and foaming properties.
Synthetic foams are a mixture of synthetic foaming agents and stabilizers. Class A foams on the other hand are used on three-dimensional fires of ordinary combustibles and are. Class A Foam.
Industrial Class A Foam Concentrates are Industrial Foam Systems that are used in a wide range of Industrial Marine. Simply put Class B foam is more hazardous than Class A. While Class A fires are started by ordinary combustants like wood Class B fires are started by flammable combustible liquids like oil and gas.
Aqueous film-forming foams AFFF and alcohol-resistant AFFF AR-AFFF form a film between the fuel and the air sealing the surface and preventing the escape and ignition of flammable vapors. PHOS-CHEK 3 AFFF C6-based foam concentrate is proportioned at 3 concentration compatible with fresh and seawater for both fixed foam systems and manual application. Environmentally responsible KnockDown a Class A foam concentrate is a unique formulation providing unmatched firefighting performance and flexibility.
Class A foams are often intended for use at very low concentration of 01 to 1 and are formulated using environmentally favourable raw materials. Flammable liquid fires require specialized foams that are designed to both extinguish a fire and prevent reignition or burnback. Training Foam provides expansion characteristics similar to AFFF firefighting foam concentrates but does.
Class A foam is used for Class A fires which include solid combustibles such as paper wood cloth and some plastics. As the finished-foam stream contacts the burning fuel it. A foam blanket is formed that works to prevent the release of fuel vapor and separates the fuel from the air it needs to burn.
Class B Foam Agents are the ideal fire suppression choice for hazards involving flammable and combustible liquids. Training Foam has been designed to provide fire departments and training institutions with an inexpensive training alternative to Aqueous Film Forming Foam AFFF. Class A Foam and the Structure Fire Attack.
The fuel must be contained or diked for the film to form. Other Class A foam 1983. The use of class A foam on a class B fire may yield unexpected results as class A foams are not designed to contain the explosive vapors produced by flammable liquids.
Environmental concerns in particular arise with the chemical makeup of Class B foam. Used to extinguish Class B materials which include gasoline oil and jet fuel. CHEMGUARD Class A concentrates are effective in fighting many deep-seated.
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