AFFF (aqueous film-forming foam) and FFFP (film-forming fluoroprotein) fire extinguishers are rated for use on both Class A and Class B fires. As the name implies, they discharge a foam material rather than a liquid or powder.
Which type of extinguisher is intended to be used on a Class B fire quizlet?
~Co2 extinguishers are most effective in extinguishing Class B and Class C fires. ~ Their discharge is in the form of a gas, they have a limited reach and the gas can be dispersed by wind.
Which method of fire extinguishment forms an oxygen excluding soapy foam over the surface of the burning material?
Wet chemical (potassium acetate, potassium carbonate, or potassium citrate) extinguishes the fire by forming an air-excluding soapy foam blanket over the burning oil through the chemical process of saponification (a base reacting with a fat to form a soap) and by the water content cooling the oil below its ignition …
Which statement about using portable fire extinguisher is accurate?
Which statement about using a portable fire extinguisher is accurate? Wind can limit the reach of the extinguishing agent after it is expelled. On which type of fires are stored-pressure water mist extinguishers safe and effective to use? Which type of extinguisher is intended to be used on a Class B fire?
What types of materials do Class B fires involve quizlet?
Class B fires involve flammable and combustible liquids and gases, such as alcohol, gasoline, lubricating oils, and liquefied petroleum gas (LPG).
What type of portable fire extinguisher is intended for use on Class K fires?
Currently, the only effective extinguisher rated as Class K is the Wet Chemical fire extinguisher.
Which extinguishing agent should be used for a Class D fire?
The only type of Class D fire extinguisher is the Dry Powder extinguisher. The powder agent used is either powdered graphite, granular sodium chloride or copper based, all of which are effective at separating the fuel from the oxygen.
Which method of fire extinguishment forms an oxygen excluding?
Foam extinguishers use an aqueous film-forming foam (AFFF) agent that expels a layer of foam when it is discharged through a nozzle. It acts as a barrier to exclude oxygen from a fire. The extinguishing agent in a Class C fire extinguisher must be electrically nonconductive.
How does foam extinguish fire?
The foam extinguishes liquid fires by sealing the surface of the liquid, preventing flammable vapour reaching the air and starving the fire of fuel. They are not suitable for use on free flowing liquid fires. Foam extinguishers have a cream label.
What is a Type D fire extinguisher?
Class D fires involve combustible metals, such as magnesium, titanium, and sodium. Extinguishers with a D rating are designed to extinguish fires involving combustible metals. Note: Common extinguishing agents may react with a combustible metal fire causing the severity of the fire to increase.
What types of materials do Class B fires involve?
Class B: Flammable liquids such as alcohol, ether, oil, gasoline and grease, which are best extinguished by smothering.
What is portable fire extinguisher?
Portable fire extinguishers function by releasing an extinguishing agent intended to cool the fuel, remove or displace the oxygen, or stop the chemical reaction. Fire extinguishers can put out or control a fire until help arrives. … Stay low and avoid breathing the smoke and extinguishing agent.
Which Class of fire extinguishers are water based extinguishers quizlet?
Class A extinguishers are water-based solutions that are used on paper, cloth, wood, trash, and other common combustible fires. These extinguishers utilize a cooling and soaking stream that is effective on Class A fires.
Can Class K fire extinguishers be used on any fire?
Selecting the Right Fire Extinguisher
No other type of fire extinguisher will be successful at putting out a Class K fire. Class K fires can only be extinguished with Class K extinguishers, and should never be sprayed with water as this can increase the spread of the cooking liquids.
What is inside a Class A extinguisher?
Agents which are effective at fighting Class A fires include water, chemical foam, and dry chemicals often contained in class A or multi-purpose fire extinguishers. … Dry chemicals and halotron stop the chemical reaction needed to convert fuel into a usable, gaseous form to feed the fire.