fire prevention and control
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What is fire prevention and control?
Fire prevention and control involves preventing, detecting, and extinguishing fires. It includes researching fire causes, educating the public, and maintaining fire-fighting equipment.
Fire prevention units focus on raising public awareness, incorporating fire-prevention measures in building and machinery design, reducing potential fire sources, and installing equipment like extinguishers and sprinkler systems. Alarm systems, heat-sensitive devices, and smoke detectors are crucial for early fire detection, while fire engines, ladder trucks, and fireboats are used for extinguishing fires.
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What are the main causes of fires?
Fires can start from various causes, including accidents in the home, such as faulty electrical wiring and a lack of fire safety measures. The careless use of fireworks can also ignite large fires. Wildfires may result from power lines falling during high winds, with dry conditions and strong winds further increasing the risk and spread of fire. Arson is also a cause, and some fires remain under investigation.
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How can we prevent fires in homes and schools?
To prevent fires in homes and schools, it's essential to heighten public awareness through educational programs, incorporate fire-prevention measures in building design, and reduce potential fire sources. Most cities' building codes include fire safety regulations. These codes ensure that buildings are designed to contain fires, include alarms and exit signs, isolate fire-causing materials, and have fire-extinguishing equipment.
Alarm systems are a basic mechanism to warn people to leave buildings quickly and alert the fire department. Automatic sprinkler systems can release water onto a fire. Fire extinguishers can also put out small fires by cooling the burning material or depriving the flame of oxygen.
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What should you do if a fire starts?
If a fire starts, first activate the building's alarm system to alert others and contact the fire department immediately. If the fire is small and manageable, use a fire extinguisher appropriate for the type of fire (Class A for wood/paper, Class B for flammable liquids, Class C for electrical, Class D for metals). Aim at the base of the flames, using a sweeping motion. If the fire spreads rapidly or you're unsure how to handle it, evacuate immediately. Close doors behind you to slow the fire's spread and use designated exits.
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What equipment helps in fighting or detecting fires?
Fire prevention and control involves a range of equipment for detecting and fighting fires. Effective fire-prevention programs increase public awareness and incorporate fire-safety measures in building design.
Alarm systems are crucial for alerting occupants and fire departments to a fire's location. Automatic detectors include heat-sensitive devices, rate-of-rise detectors, and smoke detectors that sense smoke through changes in light or ionization.
Many buildings have automatic sprinkler systems, which release water upon fire detection. Firefighting equipment ranges from extinguishers to fire engines with hoses, ladders, and water tanks. Fireboats combat fires on ships and waterfronts.
Various extinguishing agents exist for different fires. Foaming agents handle oil fires. "Wet" water protects structures, while ablative water forms a heat-absorbing blanket. Carbon dioxide is used when water is unsuitable, and dry chemicals extinguish electrical fires. Aircraft drop fire-retardant slurries on bush, grass, and forest fires. Personal protective equipment such as boots, gloves, helmets, pants, and coats, are used by firefighters.
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How do firefighters and emergency services control and stop large fires?
Firefighters and emergency services stop large fires using a systematic approach. This involves protecting uninvolved areas, confining the fire, and ventilating the building to remove toxic products. Extinguishment is achieved using water streams and other agents. For wildfires, strategies include spraying water, creating fire lines by removing vegetation, and, as a last resort, backfiring to eliminate fuel. Aircraft are used for dumping water and transporting personnel.
Effective control includes field surveys to identify at-risk areas and improve barriers. Fire suppression aims to break the fire triangle of fuel, temperature, and oxygen. This is done by removing combustible material, reducing temperature, and limiting available oxygen.
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fire prevention and control, the prevention, detection, and extinguishment of fires, including such secondary activities as research into the causes of fire, education of the public about fire hazards, and the maintenance and improvement of fire-fighting equipment.
Until after World War I little official attention was given to fire prevention, because most fire departments were concerned only with extinguishing fires. Since then most urban areas have established some form of a fire-prevention unit, the staff of which concentrates on such measures as heightening public awareness; incorporating fire-prevention measures in building design and in the design of machinery and the execution of industrial activity; reducing the potential sources of fire; and outfitting structures with such equipment as extinguishers and sprinkler systems to minimize the effects of fire.
The importance of increasing public understanding of the causes of fire and of learning effective reactions in the event of fire is essential to a successful fire-prevention program. To reduce the impact and possibility of fire, the building codes of most cities include fire safety regulations. Buildings are designed to separate and enclose areas, so that a fire will not spread; to incorporate fire-prevention devices, alarms, and exit signs; to isolate equipment and materials that could cause a fire or explode if exposed to fire; and to install fire-extinguishing equipment at regular intervals throughout a structure. Fire-retardant building materials have also been developed, such as the paints and chemicals used to coat and impregnate combustible materials, such as wood and fabric.
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In the United States a study conducted over a 10-year period found that the most frequent type of fire was electrical (23 percent of all fires); other causes of fire included tobacco smoking (18 percent), heat caused by friction in industrial machinery (10 percent), overheated materials (8 percent), hot surfaces in such devices as boilers, stoves, and furnaces (7 percent), burner flames (7 percent), and combustion sparks (5 percent).
To reduce the hazardous effects of fire the most basic mechanism is an alarm system, which warns people to leave a building at once, alerts the fire department, and identifies the location of a fire within a structure. Besides the fire alarms that are triggered by people, there are many automatic devices that can detect the presence of fire. These include heat-sensitive devices, which are activated if a specific temperature is reached; a rate-of-rise detector, which is triggered either by a quick or a gradual escalation of temperature; and smoke detectors, which sense changes caused by the presence of smoke, in the intensity of light, in the refraction of light, or in the ionization of air.
Many public buildings are equipped with automatic sprinkler systems, which release a spray of water on an affected area if a fire is detected. The effectiveness of these systems has been proved in data accumulated from throughout the world: in buildings protected by sprinkler systems that had fires, the system extinguished fires in 65 percent of the cases and contained fires until other fire-fighting measures could be taken in 32 percent of the cases. A major problem with sprinkler systems is the potential for water damage, but it has been found that in most cases this threat is minimal compared with the damage that a fire could cause.
There exists a considerable variety of fire-fighting equipment, ranging in sophistication from buckets and extinguishers to the elaborate yet portable apparatus used by fire departments. The most common of these is the fire engine, equipped with hoses, ladders, water tanks, and tools. Ladder and rescue trucks work in conjunction with trucks equipped with platforms that can be elevated by hydraulic lifts to carry out rescue efforts. Fireboats are employed in combating fires on ships and on waterfront property.
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Fire-extinguishing agents other than water are used to fight various types of fire. Foaming agents are employed to handle oil fires. “Wet” water, formed by the addition of a chemical that reduces surface tension, can be used in a clinging foam to protect the exterior of a structure near the source of a fire. Ablative water, made by mixing water with additives, forms a dense, heat-absorbing blanket. Carbon dioxide is employed when water cannot be used and a fire must be fought by suffocation. Dry chemicals are used to extinguish electrical fires or burning liquids, while dry powder is utilized to put out such burning metals as magnesium and phosphorus. Halogenated hydrocarbons, commonly called halons, take the form of liquefied gas or vaporizing liquids at room temperature; they inhibit the flame chain reaction. Steam is used to control fire in confined areas, while inert gas is employed to extinguish gas, dust, and vapour fires.
Fire fighting is a battle against time. The initial priority is rescuing any occupants that may be in a burning building. Precedence is then given to any location from which the fire may spread to a neighbouring structure. A typical method of fire fighting is the over-and-under system. Working from inside the building, if possible, the bulk of the fire fighting takes place from below, while further attack is carried out from above in an effort to prevent the fire from spreading upward.
In rural areas water-tank trucks are usually needed, thus the time factor becomes even more critical. Bush, grass, and forest fires are frequently fought using the same equipment that is used on structural fires. Aircraft are sometimes employed to dump fire-retardant slurries or water mixtures on these blazes.
It has also become necessary to combat fires in pressurized chambers, including spacecraft. The combustion rate in these environments is much higher than it is under normal atmospheric pressure. Strict construction guidelines are followed to keep fire hazards to a minimum, and highly pressurized sprinklers are installed that act immediately upon any combustion.