Which extinguishing agents are suitable for hydrocarbon refrigerant fires?

• A. Only CO2 extinguishers.
• B. Water streams are always best.
• C. Wet sand and dirt only.
• D. Agents approved for hydrocarbon fires (e.g., dry chemical, foam, water mist); avoid inappropriate agents like water streams in certain cases.

Answer: (D)

When a refrigerant fire involves hydrocarbon liquids, treat it as a Class B fire and use extinguishing media designed for hydrocarbon fuels. The best choice is to use agents approved for hydrocarbon fires—such as dry chemical powders, foam, or water mist. Dry chemical powders disrupt the flame chemistry and help stop the reaction, foam blankets the liquid to prevent vapor release and cools the surface, and water mist provides cooling and vapor suppression with less risk of spreading the fuel than a solid stream of water. Water streams are not ideal for hydrocarbon liquids because they can spread the burning fuel and worsen the fire in many scenarios. Wet sand or dirt don’t act as reliable extinguishing agents for ongoing fires. So the recommended approach is to use media specifically approved for hydrocarbon fires and avoid inappropriate water streams in many cases.