learn fire prevention knowledge and stay away from fire danger!
Today, An Zai uses 7 cases
to tell you about 6 types of fires
and 4 common correct fire extinguishing methods
. Let's learn together!
Class A fire:
Fire caused by solid substances, which usually have organic properties and can generally produce glowing embers when burning. Such as wood, cotton and linen, paper, etc.
A cigarette killed 7 people
At 9: 52 am on June 7, 2121, a fire broke out in a logistics distribution shop in the front of Jiaxin Hua Ting Community in Yongfeng Street, Shuangfeng County, Hunan Province, killing 7 people. After investigation, the fire was caused by the unlit cigarette butts igniting the packaging cartons.
Fire extinguishing method
Water type, foam, ammonium phosphate dry powder, haloalkane type fire extinguisher and hexafluoropropane fire extinguisher are selected.
class b fire:
liquid or meltable solid fire. Such as gasoline, kerosene, asphalt, paraffin, etc.
Steam explosion caused by electrostatic spark in tire factory
At 12: 34 on August 9, 2119, a tire repair shop in Longgang District, Shenzhen, Guangdong Province exploded, killing four people.
after investigation, employees of the business department, Li and Chen Mou (the deceased), poured the gasoline in the disassembled fuel tank into the plastic bucket, and when the plastic bucket was moved, the electrostatic spark caused the gasoline vapor to explode and spread to disaster.
Static electricity causes flammable vapor to catch fire
At 13: 11 on September 29, 2119, a major fire accident occurred in Zhejiang Ningbo Ruiqi Commodity Co., Ltd., causing 19 deaths and 3 injuries.
The investigation found that the direct cause of the accident was that when Sun Mosong, an employee of Ruiqi Company, poured the heated isoparaffin mixture into a plastic bucket, flammable vapor caught fire due to electrostatic discharge and spread to disaster.
Fire extinguishing method
Cut off the source of combustible liquid and choose dry powder, foam, halon and carbon dioxide fire extinguishers.
class c fire:
gas fire. Such as gas, natural gas, methane, etc.
Natural gas explosion caused 26 deaths and 138 injuries
At about 6: 31 am on June 3, 2121, a natural gas explosion occurred in Yanhu Community, zhangwan district, Shiyan City, Hubei Province, and the vegetable market of 41 factories was destroyed, resulting in 26 deaths and 138 injuries.
Fire extinguishing method
First, close the combustible gas valve and choose dry powder, halon and carbon dioxide fire extinguishers.
class d fire:
metal fire. Such as potassium, sodium and magnesium.
The aluminum slag stack caught fire by mistake.
At 18: 12 on October 7, 2121, an aluminum slag stack in the workshop of the old factory of Hunan Bangpu Recycling Technology Co., Ltd. exploded and caught fire. Because the company leaders and employees were not aware of the nature of the fire (metal fire), the rescuers blindly used dry powder fire extinguishers, water-based fire extinguishers and fire hoses to rescue, resulting in 1 deaths and 18 injuries.
fire extinguishing method
powder graphite fire extinguisher and special dry powder fire extinguisher (special fire extinguishing agent such as 7151) are selected, and dry sand, dry stone powder and cement can also be used for covering fire extinguishing.
class e fire:
live fire, fire in which an object burns with electricity. Such as generator room, transformer room, power distribution room, computer room, etc.
generator fire equipment was damaged
At 23: 48 on October 2, 2118, the No.1 generator set of a power plant in Liaoning broke down and caught fire during the shutdown operation. At 23: 53, the No.2 generator was shut down, and at 11: 15 on March 3, the 511kV start-up and standby transformer tripped, and the auxiliary power was completely lost. The security power was brought out by the diesel generator. At the time of the accident, the output of Unit 2 was about 311,111 kilowatts, which caused the roof of Unit 1 to collapse and seriously damaged the equipment.
Fire extinguishing method
Halon fire extinguisher, carbon dioxide fire extinguisher, dry powder fire extinguisher and hexafluoropropane fire extinguisher are selected.
class f fire:
cooking fire in cooking utensils. Such as animal and vegetable oils.
water splashes into the oil pan, causing deflagration
At 19: 41 on June 6, 2121, a fire broke out in the first-and fifth-floor houses in Changde City, Hunan Province, and fires spread in the lobby, kitchen and wing on the first floor. Afterwards, it was learned that in the process of frying beef in the restaurant on the first floor, water spilled into the oil pan and exploded, which in turn triggered the burning of the range hood above.
Fire extinguishing method
Never use water, put it out with a pot cover or foam extinguisher.
Combustion must meet three conditions at the same time
Combustible substance, combustion-supporting substance and fire source
Fire can be extinguished only by removing one combustion condition
The following four common fire extinguishing methods
Learn quickly!
asphyxiation fire extinguishing method
principle: cut off oxygen, depending on how you burn it.
combustible materials can't be burned without air or the oxygen content in the air is lower than 1.4%. The so-called suffocation method is to cut off the air supply of combustion products.
this fire extinguishing method is suitable for extinguishing fires in closed rooms and production devices and equipment containers.
cooling fire extinguishing method
lower the temperature and get wet.
cooling fire extinguishing method is to spray water or fire extinguishing agent directly on combustible materials according to the condition that combustible materials must reach a certain temperature when burning, so as to reduce the temperature of combustible materials below the ignition point, and thus terminate the combustion.
this method can also be used to cool unburned objects, such as building components and equipment, so as to prevent them from burning or exploding due to the influence of thermal radiation.
isolation fire extinguishing method
there is nothing to burn when raw materials are removed.
the isolation fire extinguishing method is based on the condition that combustible materials must be available when combustion occurs, so as to isolate the combustible materials adjacent to the combustible materials and prevent the combustion from spreading further.
suppression fire extinguishing method
principle: be soft and rigid, and neutralize with acid and alkali.
the suppression fire extinguishing method is to spray the fire extinguishing agent on the combustion object to make it participate in the combustion reaction, so that the free radicals produced in the combustion disappear and form stable molecules or low-activity free radicals, thus stopping the combustion.
Many fire accidents often happen due to lack of safety awareness
How to save yourself in case of fire?
these eight escape points must be mastered!
Has everyone learned about fire fighting
?
put out the fire scientifically and guard the safety!
source: security team.