How does foam extinguisher put out fire?

How does foam extinguisher put out fire?

Foam Fire Extinguishers provide a fast, powerful means of tackling flammable liquids. They do so by creating a blanket of foam that smothers the fire, cutting of its supply of oxygen of oxygen and contains the flame preventing re-ignition.

Why is foam used to put out fires?

Foam removes the fuel from fire in much the same way that it protects against heat. A foam blanket on burning fuel holds in flammable vapors which can prevent the vapors from igniting. This same foam blanket can help to remove oxy- gen from the fire by separating the fuel and flam- mable vapors from the air.

What are the disadvantages of a foam fire extinguisher?

Disadvantages Of Foam Extinguishers A foam fire extinguisher is mostly water. therefore should not be used on Class E fires. The aqueous solution is corrosive and requires to be cleaned after used, particularly on painted surfaces. It is advised to not use foam extinguishers for class F fires.

What is the minimum requirement for CO2 gas to be released to fight a fire in the engine room?

To obtain a total flooding of engine room, about 35% by volume of CO2 is required in 2 minutes. This will reduce the oxygen content of the air in engine room to less than 15% to extinguish the fire. At this CO2 concentration human life cannot be supported.

How do you extinguish a fire in a CO2 room?

Close all the entrance doors of the engine room and make sure the room is air tight. 11. Operate the control and master valve in the CO2 cabinet. This will sound another alarm and after 60 seconds time delay CO2 will be released for fire extinguishing.

How do fires affect humans?

Wildfires increase air pollution in surrounding areas and can affect regional air quality. The effects of smoke from wildfires can range from eye and respiratory tract irritation to more serious disorders, including reduced lung function, bronchitis, exacerbation of asthma and heart failure, and premature death.