class a foam vs class b foam
The types of foam used by our customers can be basically broken into two categories Class A and Class B. Class B Foam also called AFFF.
Fffp Ar Is Multi Purpose Natural Protein Based Foam For Use On A Wide Range Of Both Hydrocarbon And Polar Solvent Fuel Fi Firefighting Foam Foam Firefighter
Cient use of class A foam.
. The valid norm is differentiated into two fire protection classes. 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. Each system includes a Hypro triplex plunger pump and DC 12 or 24 volt motor assembly.
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. These foam concentrates are efficient on solid class A fires such as wood carboard trash plastics as well as on hydrocarbons and polar solvents class B fires diesel acetone.
Used to extinguish Class B materials which include gasoline oil and jet fuel. 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. Training Foam can be used with Class A or Class B foam proportioning systems.
Class A Foam and the Structure Fire Attack. Class A foam is used for combustibles structural fires and wildfires. Can use AB foam on a fuel spill on a roadway as well as in a building or factory fire.
When proportioned with water Class A concentrates reduce the solution surface tension and allow greater penetration of the foam into most Class A fuels. CHEMGUARD Class A foam concentrates combine foaming and wetting agents for use in a variety of firefighting applications. Environmental concerns in particular arise with the chemical makeup of Class B foam.
Nonpolar concentrates can be applied to hydrocarbons only. Class B foam works by creating a skinfilm over the surface of the combustible or flammable liquid separating the fuel from the air. The advantages of using CAFS generated Class A foam in structural firefighting are.
Also included are a microprocessor controldisplay unit instruction placard strainer foam injection check valve complete shielded cable set and. Class B foam is. Effective on Class A fires High Expansion is very use-ful for confined space fire-fighting and as a wetting agent.
Qualified to USDA Forest Service 5011-307a and UL approved for use as a wetting agent for Class AB applications. Class A foam is used for Class A fires which include solid combustibles such as paper wood cloth and some plastics. The fuel must be contained or diked for the film to form.
Only one sort of fire suppression foam required in the. Class B is relevant for PU foam. The cost of the foam concentrate was not a limiting factor for any of the departments contacted.
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 foams on the other hand are used on three-dimensional fires of ordinary combustibles and are. B1 low flammability.
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. These are the same classes as used in identifying fire extinguishers. For example municipal fire brigades.
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. Costs for foam Class A foam costs approximately 110 of the cost of class B foams per gallon of foam produced. High Expansion can be used on small scale Class B Hydrocarbon Fires.
Class B foam is used on flammable liquids. This is then subdivided into the following levels. Many Class A foams are environmentally friendly and biodegradable when used in appropriate quantities.
Class A foams are often intended for use at very low concentration of 01 to 1 and are formulated using environmentally favourable raw materials. Class B foam is for petro chemical fires gasoline oil crude jet fuel etc. A stands for non-flammable and B for flammable materials.
Class B AR 6 which is about the same for the emusifier how ever look at the cost. As the finished-foam stream contacts the burning fuel it. This document is one of a series of three Foam vs Fire publications that are avail-able.
Class A foam is for Class A materials which is wood paper brush all common combustables. There are many TYPES of Class B foams and the user must be carefull to use the correct Class B foam for the petrochemical that is involved. 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 A Foam for Wildland Fires 3. Environmentally responsible KnockDown a Class A foam concentrate is a unique formulation providing unmatched firefighting performance and flexibility. The 2000 series is available in two models differing only in capacity.
Class A foam will cost about 3 per 100 gallons of water 10 to 12 per gallon of concentrate the emusifier costs a. 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. Industrial Class A Foam Concentrates are Industrial Foam Systems that are used in a wide range of Industrial Marine.
There are many different types of foam for firefighting. National Foams Class A Foams are also wetting agents. Simply put Class B foam is more hazardous than Class A.
Class A andor B Foam. Class B foams are designed for class B firesflammable liquids. 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.
Class A Foam vs. Class A foam concentrate is a synthetic chemical additive that reduces the surface tension of water so it can penetrate combustible fuel surfaces. Mid-Expansion of Synthetic Detergent based foam is used for suppressing haz-ardous vapors.
Class A foam is used on common combustibles such as paper wood and textiles. The two major classes of Firefighting Foam. Class A Foam and CAFS Training.
B2 normal flammability. Costs for training Most departments did not quantify the cost of training their personnel to operate class A foam systems. Training Foam provides expansion characteristics similar to AFFF firefighting foam concentrates but does.
Class A foam typically runs at 03 05 or 1. Class B foams have two major subtypes.
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