Ch. 7 Portable Fire extinguishers Flashcards
A fire in ordinary combustible materials, such as wood, cloth, paper, rubber, and many plastics.
Class A fire
A fire extinguisher that uses carbon dioxide gas as the extinguishing agent. It is rated for use on Class B and C fires.
Carbon dioxide fire extinguisher
A powder composed of very small particles, usually sodium bicarbonate, potassium bicarbonate, or ammonium phosphate based with added particulate material supplemented by special treatment to provide resistance to packing, resistance to moisture absorption (caking), and the proper flow capabilities.
Dry chemical
A solution based on fluorinated surfactants plus foam stabilizers to produce a fluid aqueous film for suppressing liquid fuel vapours.
Aqueous film-forming foam
Solid materials in powder or granular form designed to extinguish Class D combustible metal fires by crusting, smothering, or heat-transferring means
Dry powder
Normally an aqueous solution of organic or inorganic salts or a combination thereof that forms an extinguishing agent.
Wet-chemical extinguishing agent
A device that locks a fire extinguisher’s trigger to prevent its accidental discharge.
Locking mechanism
An agent that has sufficient vapour pressure at normal operating temperatures to expel itself from a fire extinguisher.
Self-expelling agent
A fire extinguisher containing distilled or de-ionized water and employing a nozzle that discharges the agent in a fine spray.
Water mist fire extinguisher
What is the tapered discharge nozzle of a carbon dioxide fire extinguisher called?
Horn
Occupancies where the quantity, combustibility, and heat release of the materials is low, and the majority of materials are arranged so that a fire is not likely to spread.
Light hazard locations
The process of converting the fatty acids in cooking oils or fats to soap or foam; the action caused by a Class K fire extinguisher.
Saponification
Agents that include hydrochlorofluorocarbons (HCFCs), hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), fluoroiodocarbons (FICs), and other agents that are found acceptable under the Environmental Protection Agency Significant New Alternatives Policy program.
Halocarbon
A fire in a cooking appliance that involves combustible cooking media (vegetable or animal oils and fats).
Class K fire
The button or lever used to discharge the agent from a portable fire extinguisher.
Trigger
A halogenated agent whose chemical name is bromochlorodifluoromethane (CBrClF2) and that is a multipurpose, Class ABC–rated agent effective against flammable liquid fires.
Halon 1211
Acronym for the steps involved in operating a portable fire extinguisher.
PASS
(Pull, Aim, Squeeze, Sweep)
An extinguishing agent used in dry-chemical fire extinguishers that can be used on Class A, B, and C fires.
Ammonium phosphate
A gauge on a pressurized portable fire extinguisher that indicates the internal pressure of the expellant.
Pressure indicator
A device for use in applications requiring special water discharge patterns, directional spray, or other unusual discharge characteristics.
Nozzle
A fire extinguisher in which both the extinguishing agent and expellant gas are kept in a single container and that includes a pressure indicator or gauge.
Stored-pressure fire extinguisher
A water-based fire extinguisher that uses an alkali metal salt as a freezing-point depressant.
Loaded-stream fire extinguisher
Chemicals including bromochlorodifluoromethane, bromotrifluoromethane, and mixtures of these two
Halons
A fire extinguisher in which water or a water-based extinguishing agent is stored under pressure.
Stored-pressure water-type fire extinguisher
