​The 45L Trolley Type Foam Fire Extinguisher: A Mobile Solution for Flammable Liquid Fires

Of course. Here is an original English article about a 45L Trolley Type Foam Fire Extinguisher.

The 45L Trolley Type Foam Fire Extinguisher: A Mobile Solution for Flammable Liquid Fires

In high-risk environments where flammable liquids are present, a standard portable fire extinguisher is often not enough. For these significant hazards, the 45L Trolley Type Foam (AFFF) Fire Extinguisher serves as a critical first-attack unit, combining high capacity with mobility and targeted suppression power.

This extinguisher is a substantial piece of equipment, centrally mounted on a robust, two-wheeled carriage for easy transportation by a single operator. Its large capacity makes it indispensable for protecting areas such as vehicle workshops, aircraft hangars, petrochemical plants, fuel storage areas, and industrial warehouses. It is specifically designed to tackle Class A (solid combustibles like wood) and, most importantly, Class B fires, which involve flammable liquids like gasoline, oil, solvents, and paints.

The agent inside is Aqueous Film Forming Foam (AFFF) concentrate, which is mixed with water in a precise proportion when the extinguisher is commissioned. The principle of operation is highly effective. When discharged, the nozzle aerates the solution, creating a thick, blanketing foam. This foam smothers the flames by sealing the surface of the burning liquid, preventing oxygen from feeding the fire and simultaneously suppressing flammable vapors from escaping. This dual action of smothering and vapor suppression makes it far more effective on liquid fires than water or powder alone.

Operating this large unit is straightforward, typically following the PASS technique with slight modifications due to its size:

*   **P**ull the safety pin to unlock the mechanism.

*   **A**im the large-volume applicator nozzle towards the base of the fire, standing at a safe distance.

*   **S**queeze the lever to start the powerful discharge.

*   **S**weep the nozzle across the area of the fire, allowing the foam to blanket the liquid surface completely.

A key advantage of the foam agent is its post-discharge performance. The foam blanket remains on the surface for a significant time, providing a cooling effect and preventing re-ignition—a common risk with other extinguishing agents. Furthermore, unlike dry powder, the foam is non-abrasive and less damaging to machinery and electronics, though cleanup is still required.

However, it is crucial to note that foam is not suitable for Class C (flammable gas) or Class F (cooking oil) fires unless specifically formulated. Its primary domain remains Class A and B risks.

In conclusion, the 45L Trolley Type Foam Fire Extinguisher is an essential piece of industrial firefighting equipment. Its mobility, high capacity, and highly effective foam agent make it the premier choice for safely controlling and extinguishing dangerous flammable liquid fires, protecting both personnel and valuable assets.

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