REVIEW 7 QUESTIONS

Basic Military Requirements (BMR) Revised Edition
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class of fire, the primary agent and best method for extinguishing the fire can be determined as shown in figure 12-9. Many substances, such as liquids, gases, and solids, are used as firefighting agents. The selection and use of these agents varies with the class of fire, its location, and the extent of the fire involvement. Although seawater is the most valuable firefighting agent available based on its endless supply, considerations should always be taken to determine if water is the best agent to put out the type of fire being fought. REVIEW 7 QUESTIONS Q1. Match the class of fire with the types of materials involved. 12-22 Student Notes: CLASSES OF FIRE TYPES OF MATERIALS INVOLVED METHOD(S) OF EXTINGUISHING A Wood and wood products, cloth, textiles and fibrous materials, and paper and paper products. Water in straight or fog pattern. If the fire is deep-seated, aqueous film forming foam (AFFF) is more effective than seawater and can be used as a wetting agent. B Flammable liquids, such as gasoline, diesel fuel (F-76), jet fuels, hydraulic fluid, and lube oil. Also, involves flammable gases. Extinguished with AFFF, Halon 1211, Halon 1301, or potassium bicarbonate (PKP). Never extinguish flammable gases unless there is a good chance that the flow of gas can be secured. Securing the flow of gas is the single most important step in controlling a gas fire. C Energized electrical fires. Use nonconductive agents, such as CO₂, Halon 1211, or water spray. Most effective tactic is to de-energize and handle the fire as a class A fire. If fire isn’t deep-seated, clean agents that don’t a cleanup problem are preferred (CO₂ or Halon 1211). D Combustible metals, such as magnesium and titanium. Water in quantity, using fog patterns. When water is applied to burning class D materials, explosions may occur. Apply water from a safe distance or from behind shelter. Figure 12-9.—Classes of fire. MATERIALS CLASSES OF FIRE a. Hydraulic fluid A b. Energized circuit board B c. Paper C d. Gasoline D e. Magnesium f. Cloth g. Titanium

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