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personnel qualification standard (pqs) - I Marine Expeditionary ...

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103 Safety Fundamentals<br />

RESPIRATORY PROTECTION (RESPIRATORY PROTECTION<br />

PROGRAM)<br />

<strong>Marine</strong> Corps <strong>personnel</strong> working in areas where they may be exposed to harmful<br />

levels of airborne dust, fogs, fumes, mists, gases, smokes, sprays, or vapors shall<br />

be provided appropriate respiratory protection, per guidelines of industrial<br />

hygienist, at government expense.<br />

103.4 Discuss the four general classes of fires and which types of extinguishers<br />

are used on each.<br />

CLASS A<br />

Involve solid substances such as - wood, cloth, and paper – which, usually leave<br />

an ash. Explosives are in this category. Water is the usual means of<br />

extinguishing a Class A fire.<br />

CLASS B<br />

Involve flammable liquids - oil, gasoline etc. For small fires or in confined<br />

spaces, CO2 & purple “K” powder (PKP) are effective. For large fires, aqueous<br />

film-forming foam (AFFF) is the usual means of extinguishing. Spaces subjected<br />

to major fuel or lube-oil spills (fire rooms, engine rooms, fuel transfer etc.) are<br />

equipped with HALON 1301 (fluorocarbon gas flooding systems; these are<br />

manually activated only after other fire fighting methods fail.<br />

CLASS C<br />

Ignite in electrical/electronic equipment, primary extinguishing method is to deenergize<br />

the equipment. CO2 is the preferred extinguishing agent.<br />

CLASS D<br />

Involve combustible metals (magnesium, titanium, etc.) and any fires that<br />

required special handling. High or Low - velocity fog at extreme range upwind of<br />

this type of fire.<br />

103-6

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