IFSTA Ch. 7 - Portable Fire Extinguishers
Terms in this set (46)
Standard for Portable Fire Extinguishers
Portable fire fighting device designed to combat INCIPIENT fires.
Class A Fires
Involve ordinary combustibles such as textiles, paper, plastics, rubber, and wood. Use water, Class A foam, or dry chemical.
Extinguishing system that uses dry chemical (like sodium bicarbonate) as the primary extinguishing agent; often used to protect areas containing volatile flammable liquids. Class A, B, and C fires. Can be corrosive.
Class B Fires
Involve flammable and combustible liquids and gases, such as alcohol, gasoline, lubricating oils, and liquefied petroleum gas (LPG). Use Carbon Dioxide (CO2), DRY CHEMICAL, or Class B foam.
Class C Fires
Involve energized electrical equipment. Extinguishing agents can not conduct electricity. Once power supply is turned off, fire can be treated as a Class A or B fire.
Class D Fires
Involve combustible metals such as lithium, magnesium (found in wheels, transmissions, and some metal box spring beds), potassium, titanium, zirconium, and sodium. Use DRY POWDER extinguishers.
Class K Fires
Involve combustible cooking oils or fats. Use WET CHEMICAL systems and extinguishers.
Wet Chemical System
Installed in range hoods and associated ducting where grease may accumulate. Used to protect against Class K fires.
Excluding oxygen from the burning process.
Reducing the burning material below its ignition temperature.
Interrupting the chemical chain reaction.
Forming an oxygen-excluding soapy foam surface. Occurs when mixtures of alkaline-based chemicals and certain cooking oils come into contact resulting in the formation of a soapy film.
The operator physically applies pressure to a pump that increases pressure within the container, forcing the agent out a nozzle at the end of a hose.
Compressed air or inert gas within the container forces the agent out a nozzle at the end of a hose when the operator presses the handle.
Compressed inert gas is contained in a separate cartridge on the side of the container which is punctured, and then the expel ant enters the container forcing the agent out a nozzle on the end of a hose.
Pump-Type Water Extinguishers
Worn on the back with a trombone-style slide pump, used primarily on ground cover fires. Nozzle produces a straight stream, fog, or water-mist pattern.
Fire extinguisher capable of atomizing water through a special applicator.
Stored-Pressure Water Extinguishers
Water is stored in a tank along with compressed air or nitrogen. Includes a gauge that shows when it is properly pressurized. Often used for confined hot spots during overhaul.
Class A Foam
Reduces the surface tension of water, allowing quick penetration of the surface. Aids in deep-seated fires, such as upholstered furniture, vehicle seats, or dense vegetation.
Water-Mist Stored-Pressure Extinguishers
Use deionized water that prevent electrical conduction making it usable on Class C fires. Nozzles produce a fine spray.
Water from which ionic salts, minerals, and impurities have been removed by ion-exchange.
Aqueous Film Forming Foam (AFFF) Extinguishers
Contains AFFF concentrate mixed with water and stored-pressure by compressed air or nitrogen and an air-aspirating foam nozzle. Produces a foam which floats on the surface of liquid fuels (Class B fires), creating a vapor seal.
Clean Agent Extinguishers
Replaced Halon extinguishers. Discharged as a rapidly evaporating liquid that leaves no residue. Include FE-36, HCCF, HFC, PFC, and FIC. Used on Class A, B, and C fires.
Halogenated Extinguishing Agents
Halon 1211 and Halon 1301 were extremely effective "clean" agents, however were found to damage the atmosphere's ozone layer.
Carbon Dioxide (CO2) Extinguishers
Used on Class B and C fires. Stored under its own pressure as a liquefied gas. Discharged as ice crystals which quickly change directly to a gas. Extinguishes by displacing oxygen.
Dry Powder Extinguishers
Each extinguisher is designated to extinguish a certain metal fire. Not universal. Creates a smothering blanket. Can be applied with an extinguisher or with a scoop.
Extinguisher Rating System
Class A and B extinguishers are rated by performance. Based on tests conducted by Underwriters Laboratories (UL).
Class A Ratings
From 1-A to 40-A. Based on amount of extinguishing agent. 1-A contains 1.25 gallons of water. 2-A contains 2.5 gallons of water (twice 1-A). And so on.
Class B Ratings
From 1-B to 640-B. Based on the square foot area of a flammable liquid fire that can be extinguished with one full extinguisher. 1 square foot for each numerical rating. (5-B can extinguish 5 square feet)
Class C Ratings
No numerical rating. Confirms that the agent will not conduct electricity
Class D Ratings
No numerical rating. Application instructions included on the faceplate.
Class K Ratings
Confirms that the extinguisher is capable of extinguishing a fire from a deep fryer using light oils with a surface area of at least 2.25 square feet.
Class A Symbol
Green triangle. Trash can and camp fire.
Class B Symbol
Red square. Gas can.
Class C Symbol
Blue circle. Power cord and electrical outlet.
Class D Symbol
Yellow star. Broken gear?
Class K Symbol
Black Hexagon. Cooking pan.
External condition, hose/nozzle, weight, and pressure gauge.
PASS Application Method
Pull the pin breaking the tun wire or plastic seal.
Aim the nozzle at the base of the fire.
Squeeze the handles together to release the agent.
Sweep the nozzle back and forth to cover the burning material.
Lay on their sides after use to signal to others that they are empty.
At least once each year. Typically firefighters will inspect on the apparatus at the beginning of each work period or at least weekly.
Value of a Fire Extinguisher
Based on Serviceability, Accessibility, and Simplicity of Operation.
Care of Dry Chemical Extinguishers
Shake monthly to loosen the agent and prevent it from settling. Every six years should be emptied and refilled.
Always recharge or refill regardless of the amount of the agent used.
Performed on containers under internal pressure.
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