The application of foam tank in A, B and C liquid fire

1. What are A, B, C liquids?

China’s “Building Design Fire Code” will be able to burn the liquid into a class A liquid, class B liquid, C liquid in three categories. The classification of dangerous goods can be compared to the above-mentioned class A and class B liquids into flammable liquids, class C liquids into the class of flammable liquids. A, B, C category of liquids according to the closed cup flash point division.

Category A liquids (flash point < 28 ℃) are: carbon disulfide, hydrogen cyanide, n-pentyl burn, n-hexane, n-heptane, n-octane, 1-pentene, 2-pentene, 1-pentene, cyclohexane, benzene, toluene, xylene, ethylbenzene, chlorobutanol, methanol, ethanol, more than 50 degrees of liquor, n-propanol, ether, acetaldehyde, acetone, methyl formate, ethyl acetate, ethyl butyrate, acetonitrile, acrylonitrile, furan, pyridine. Gasoline, petroleum ether, etc;

Class B liquids (28 ℃ s flash point <60C) are: n-wang, n-decane, diethylbenzene, n-propylbenzene, styrene, n-butanol, formalin, acetic acid, ethylenediamine, nitromethane, pyrrole, kerosene, turpentine, mustard oil, turpentine, etc.;

C liquids (flash point 260 ℃) are n-dodecane, n-tetradecane, dibiphenyl, bromobenzene, cycloethanol, ethylene glycol, propanetriol (glycerol), phenol, benzaldehyde, n-butyric acid, chloroacetic acid, ethyl benzoate, dimethyl sulfate, aniline, nitrobenzene, furfuryl alcohol, machinery oil, aviation lubricants, ingot oil, lard, tallow, whale oil, soybean oil, rapeseed oil, peanut oil, tung oil, castor oil, cottonseed oil Sunflower oil, linseed oil, etc.

Second, the type of A, B, and C liquid fires

1, rapid combustion caused by the fire explosion

(1) occurrence conditions. The presence of a large amount of air in a closed space or container, combustible solids, or combustible liquids in the ignition source under the role of rapid combustion, generating a large number of high-temperature gases, heated by the heat of combustion air volume increased sharply. The generation of high-temperature gas and air expansion will lead to a rapid increase in the internal pressure of the confined air or container so that a destructive explosion.

(2) typical places. With a large space containing non-volatile oil tanks, tanks, and reactors, etc. in welding, cutting fire operations, or the use of high-pressure water jets to clean the tank, there is a possibility of rapid combustion caused by the fire explosion.

2, the explosive mixture of gas fire explosion

Explosive gas mixture explosion is a typical and common combustion class explosion. Combustible gas or combustible liquid-vapor and flammable gas in the explosive concentration range of the uniform mixture of the state of fire, the formation of very fast propagation of the combustion wave. Burning heat generated by the rapid heating of the generated gas and air, the pressure rises sharply, showing the rapid combustion of mixed gas explosion phenomenon. This fire explosion in the confined space and open space are likely to occur.

Three, the application of foam tank in A, B, C liquid fire PHYM series pressure foam proportional mixing device is commonly known as “foam tank”, also called “fire fighting foam tank”, consists of foam tank body, pressure proportional mixer, diaphragm, inlet pipe, outlet pipe, and control valve, etc. It consists of a foam tank body, pressure proportional mixer, diaphragm, inlet pipe, outlet pipe, and control valve. Foam tank is an important fire extinguishing equipment in the storage tank area of petrochemical enterprises, when the fire occurs, the enterprise fire department starts “foam fire extinguishing system”, after the system is opened, the firewater is pressurized by the fire pump first; then flows into the water flange of the fire foam tank through the fire pipeline; forced by the pressure of water, the foam liquid in the foam tank is squeezed by the same volume of water into the fire pipeline. Then it will be combined with the water inside the main fire hose to form the foam water mixture solution; finally, the mixture solution will be output to the air foam generator, and the foam will be radiated down along the tank wall after the air foam generator inhales a large amount of air, so as to isolate and cool down the fire source inside and achieve the purpose of rapid-fire extinguishing.


Four, foam tank in other areas of application

Dongyue fire fighting foam tank can not only be used in foam fire fighting system but also can be used with foam generator, foam gun, foam nozzle, foam gun, and other spraying equipment to produce and spray air foam for fire fighting.