Foam extinguishing agents

Two main types of foam are in use today. These two types are chemical and mechanical they differ in the way they are produced. Chemical foams are produced by a 

In recent years, mechanical foam has come to be used more frequently. The foam is made of hydrolyzed animal or vegetable protein, stabilizers, solvents, and an industrial germicide. The regular protein-type foams are proportioned into water at rates of either 3% or 6% and are suitable for ordinary hydrocarbon liquids. These protein foams are biodegradable, nontoxic, noncorrosive, and do not present any major clean-up problems. 

The four ways to produce air foam are nozzle aspirating systems, in-line foam pump systems, in-line aspirating systems, and in-line compressed air systems. The names indicate where and how the air is injected into the water-concentrate solution to produce air foam. 

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M. I. Khoma. Composition of foam-extinguishing agent for drilling solutions—contains waste from production of hydrophilic and hydrophobic aerosil, modified with bifunctional silico-organic compound and diesel oil. Patent SU 1795977-A, 1993. 

The use of cooling tower basins and process water pumps as fire water supply is not recommended. This water is usually treated with chemicals or may be contaminated with hydrocarbons that interfere with the use of foam extinguishing agents. At best, this supply could serve as a secondary system, should the primary supply be interrupted, using emergency connections. 

Fire Hazards - Flash Point Not pertinent (combustible solid) Flammable Limits in Air (%) Not pertinent Fire Extinguishing Agents Water, foam Fire Extinguishing Agents Not To Be Used Not pertinent Special Hazards of Combustion Products Toxic oxides of nitrogen may be formed in a fire Behavior in Fire Not pertinent Ignition Temperature Not pertinent Electrical Hazard Not pertinent Burning Rate Not pertinent. 

Extinguishing Agents Dry chemical, carbon dioxide, water fog, chemical foam Fire Extinguishing Agents Not To Be Used None Special Hazards of Combustion Products Not pertinent Behavior in Fire Vapor from molten benzoic acid may form explosive mixture with air. Concentrated dust may form explosive mixture in air Ignition Temperature (deg. F) 1,063 Electrical Hazard Not pertinent Burning Rate Not pertinent. 

Fire Hazards - Flash Point (deg. F) 162 OC Flammable Limits in Air (%) 1.2 - 4.9 Fire Extinguishing Agents Foam, carbon dioxide, dry chemical, water fog Fire Extinguishing Agents Not To Be Used Water spray. Do not allow water to enter containers Special Hazards of Combustion Products Highly poisonous phosgene gas forms during fires Behavior in Fire At fire temperature the... 

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