How do you put out a gas fire?

Answer 1

That depends a great deal on the nature of the fire.

• Some chemical fires (Class A) can put out by simply dousing the fire with sufficient water which serves to absorb the heat required to sustain the combustion reaction. The water is sprayed at the base of the flames to douse the fuel and cool the fire at its source.
• Spraying water on burning liquids tends to splash them around and spread the flames. Flammable liquids require Class Bfire extinguishing methods that seek to smother the fire without spreading the liquid. CO2, foam, and dry chemical. These kind of extinguishers are sprayed above the fire so that they will fall on it like a blanket to smother it. Spraying at the base would serve to spread the fire. If at all possible, flow of the gas or liquid that is feeding the fire should be cut off.
• Some (class D) chemical fires involve burning metals. Water cannot be used on fires that burn metal. Spraying water on a class D (metal) fire will actually serve to energize the flames, potentially spreading the fire and creating additional heat and damage. The most effective way to fight class D fires is with dry powder extinguishing agents because they absorb heat and smother the flames, cutting off oxygen. It has to be the right kind of material in the powder though; the dry powder loaded into some Class B extinguishers can actually make metal fires WORSE.

In the case of huge chemical fires, the usual method is to contain the fire by pouring lots of water onto the surrounding area to keep it from spreading. Water may also be sprayed in the area of the fire to provide a heat-sink for the energy of the fire and reduce its tendency

Answer 2

completely cut the gas supply, by turning in the opposite direction to how you turned it on, and make sure its firmly screwed off when done!

Answer 3

Use a carbon dioxide fire extinguisher to stop a gas fire.

Answer 4

Use a class D fire extinguisher.