Direct Attack. Perhaps the most widely known technique – this suffocates the flames as the water is aimed at the base of the fire.
What is the most commonly used fire suppression method?
The most common method of fire suppression is the lowering of the ignition temperature with large quantities of water. Normal atmospheric oxygen content is approximately 21%. If the percentage falls below 15%, the quantity of oxygen available will no longer support combustion.
What is the most common form of ignition?
Forced ignition (i.e. external / piloted) is the most common form of accidental ignition. An external ignition source is classified as anything that can deliver enough energy in the form of heat to ignite a substance. This category includes sources such as open flames, electric arcs and sparks and mechanical sparks.
What type of rapid fire development happens?
Rapid fire development—occurrences such as flashover, backdrafts, and smoke explosions—are a significant concern for firefighters operating on the fireground.
What method of heat transfer can become the major mode as the fire grows in size?
Convection is the primary mode of heat transfer during these early stages of fire growth, since the fire plume is small and radiation heat transfer is limited.
What is the most common source of heat in combustion?
There must be Fuel to burn. There must be Air to supply oxygen. There must be Heat (ignition temperature) to start and continue the combustion process.
Sources of heat are:
What is the most common source of heat combustion reactions?
What is the most common source of heat in combustion reactions? Chemical heat energy.
What are typical ignition sources?
Ignition sources may be:
- Direct fired space and process heating;
- Use of cigarettes/matches etc;
- Cutting and welding flames;
- Hot surfaces;
- Heated process vessels such as dryers and furnaces;
- Hot process vessels;
- Space heating equipment;
What are the four methods of extinguishing a fire?
All fires can be extinguished by cooling, smothering, starving or by interrupting the combustion process to extinguish the fire.
What do you think are the common sources of ignition?
The most common ignition sources are electricity and flammable liquids. Flammable chemicals, including gases and solids, and well as personal items such as lighters and matches, can also cause fires. Electricity: One of the most common workplace ignition sources is electricity.
What is the most common source of heat in combustion reactions quizlet?
chemical energy is the most common source of heat in combustion reactions. when any combustible fuel is in contact with oxygen, the potential for oxidation exists.
What is the primary oxidizing agent in most fires?
The oxygen in the air is a primary oxidizing agent in most fires. Oxygen is the main component to living.
What is the first step in the pass application method of operating a portable fire extinguisher?
Discharge the extinguisher within its effective range using the P.A.S.S. technique (pull, aim, squeeze, sweep). Back away from an extinguished fire in case it flames up again. Evacuate immediately if the extinguisher is empty and the fire is not out.
What are heat transfer methods?
Heat can be transferred in three ways: by conduction, by convection, and by radiation.
What method of heat transfer contributes to flashover and why?
Typically this is a change from a fire located at a specific source, or “fuel package,” to a fire that takes over every other combustible object of the compartment involved without actual flame contact. The heat transfer at and beyond flashover is primarily by radiation.
Is conduction a method of heat transfer?
Conduction is one of the three main ways that heat energy moves from place to place. The other two ways heat moves around are radiation and convection. Conduction is the process by which heat energy is transmitted through collisions between neighboring atoms or molecules.