[Safety Accident] Frequently, what should we pay attention to?

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Around at 7:40 on November 9, Nanjing Gulou District Huang Jiawei fifth floor of a residential building in a loud, windows fly, hit three cars downstairs.

It is understood that Ms. Gong, who was living on the fifth floor at that time, prepared to cook. When the cooker switch was turned on, deflagration occurred. The impact of the deflagration breaks the glass of the southern balcony. After the alarm 110 and the LPG company promptly arrived at the site to carry out an investigation. The preliminary judgment may be that the doors and windows are closed, and the flammable LPG leaked to the ignition at a certain concentration .

Frequent detonation accidents

In recent years, along with the rapid development and widespread use of urban gas in China, gas accidents have also emerged in an endless stream. This not only causes human casualties and property losses, but also causes social panic and affects people's normal production and living order.


22 July 2017 at about 10:30 am, Yancheng City, Jiangsu Province, a residential tenants, the use of gas when doing lunch, due to the aging gas pipes, gas leakage, explosions occurred a few minutes after cooking, resulting in different two old The degree is burned.


July 19, 2017, gas deflagration event Zhuhai International Summer Palace Garden District occurrence residents of the home, the doors and windows are huge lift out the direct impact outside the building, one person burn area of 95%.


July 4, 2017 14:46 Xu, Songyuan City Ningjiang busy road Lane Road construction process caused by the gas leak, the gas explosion occurred at the time of the repair company, spread to neighboring hospital staff and patients. According to the official news of the Songyuan Municipal People's Government, as of 6:00 on the 5th , a total of 5 people were killed in the accident and 89 were hospitalized, 14 of whom were seriously injured.

Why frequent gas accidents?

Household gas tanks are generally 10 liters . When it is deflagrated, it is equivalent to the power of 150 kilograms of TNT explosives, enough to blow up two-story buildings.

Household gas tanks are generally 10 liters . When it is deflagrated, it is equivalent to the power of 150 kilograms of TNT explosives, enough to blow up two-story buildings.

There are many causes of gas explosions, mainly caused by equipment and human factors.

1 device reason

No safety protection device before gas appliances

At present, there are no tempered safety explosion-proof flame arresters in all domestic gas pipelines, including urban pipeline gas and bottled liquefied petroleum gas.

In recent years, gas explosion accidents have frequently occurred due to improper use of gas or gas cookers or gas water heaters that cause flashbacks. The second is that some gas cookers and gas water heaters do not have a flameout protection device installed . When the gas flame is extinguished due to natural factors or when the user does not close the gas valve, it will cause gas leakage , encounter an open flame , and cause an explosion.

Gas pipeline equipment is aging and corroded

The main source of gas supply by pipeline is natural gas and gas. As the gas pipeline is a hidden project, over time, part of the pipeline has never been tested and maintained for decades, and its safety and reliability cannot be determined. The gas pipeline network in many cities has changed along with the needs of urban construction. The location of local pipelines has changed, and the widening of roads has made gas pipelines vulnerable to pressure damage and gas leaks. In addition, the leakage of the medium can also be caused by the loose connection of valves and flanges.

Bottled gas bottle

Filling excess

That is more than 85 % of the volume of the cylinder . At this time, the bottle body is affected by external factors, and it is prone to rupture, resulting in rapid leakage and diffusion of liquefied petroleum gas.

Bottle thermal expansion

Because the liquefied petroleum gas is more sensitive to temperature. When the temperature rises from 10 degrees Celsius to 50 degrees Celsius , the vapor pressure increases from 0.64 MPa to 1.8 MPa . If it continues to rise, the bottle will explode.

Corrosion of the bottle body

Corrosion or impact of the bottle body, resulting in damage to the bottle body leakage caused by fire and explosion.

Angle valve leakage

Gas cylinder angle valve and its safety accessories leak tightly caused leakage. .

Into the bottle

The inside of the bottle enters the air. If no air is used, air will enter the bottle. At the next filling, the cylinder may explode.

2 human reasons

In the process of use of gas by urban gas users, human-caused causes of detonation of gas fires are commonly caused by the following aspects:

( 1 ) When using gas, no one looks after it, or the gas appliance is not normally opened or closed. When cooking, people leave the kitchen. When the wind or boiling soup extinguishes the flames, it causes air leakage and spreads into the air, forming an explosive gas in the kitchen.

( 2 ) Carelessness, when forgetting to close the valve or shutting off the valve when the person left the kitchen for a long time caused a lot of gas leaks.

( 3 ) An erroneous operation mistake was used to “fire with the gas” and non-compliance with “fire and other gas”: leading to leakage of gas before ignition.

( 4 ) Unauthorized dismantling, relocating, relocating, and installing gas facilities and equipment, or burying pipelines in walls or underground, unauthorized access to iron pipes, rubber hoses, or adding equipment, etc., leading to accidents caused by gas leaks.

( 5 ) Improper use of gas water heaters, or forgetting to turn off the gas valves during repairs, resulting in large gas leaks.

( 6 ) When replacing the LPG cylinders, the user does not scrutinize whether the 0 -ring of the pressure regulator is out of date or the handwheel screw is connected incorrectly.

( 7 ) Lax management, illegal storage, improper use. Especially some hot pot dining establishments.

( 8 ) The professional quality of operators engaged in gas operations is not high. Some staff have not been trained or have no regular training. Gas fire safety knowledge is poorly understood and it is not capable of detecting safety hazards or even illegal operations.

( 9 ) The diligent inspection was not carried out, daily and regular inspections were performed, and problems with gas appliances and hoses were not discovered in time and leaked.

( 10 ) When gas leaks, improper disposal or non-disposal causes the accident to expand. For example, when a gas leak occurs, an explosion is triggered by switching electrical equipment, making a call in the room, and so on.

How to use gas safely?

Gas leaks will be dealt with

If there is a gas leak or smell of gas, immediately close the cooker valve and the front valve to cut off the leaked gas. Open doors and windows to ventilate and diffuse the leaked gas. Extinguish all fire types, prohibit contact with any electrical switch, and please call the emergency call for repair.

Close the valve before going to bed, long-term off the main valve

After the gas is used, the front valve of the cooker must be closed. Before going to sleep, check that the front valve and stove valve are closed. Traveling to visit relatives, etc. needs to leave home, leading to long-term unoccupied users at home. Please close the front gas master valve before leaving to ensure safety.

Gas equipment to do diligent inspection

The smell of gas is usually similar to that of rotten eggs. Users can apply soapy water, Detergent, etc. to smear areas that may have leaks. If there is a leak, the place will continuously bubbling. The gas hose is easy to be deteriorated and damaged, and the gas metal corrugated hose has a long service life. The two sections are screwed together and will not fall off. It is safe and reliable.

It is forbidden to dismantle, change, relocate and install gas pipeline facilities without permission

It is forbidden to dismantle, modify, relocate, and install gas pipeline facilities and equipment, or to bury the pipeline in the wall or underground. It is forbidden to receive iron pipes, rubber hoses or add equipments without authorization so as to avoid air leakage and accidents.

Attention to ventilation

It is strictly forbidden to use gas in the bedroom, basement, and in a room where air does not circulate. Do not close the doors and windows when using gas. Always keep the air flowing. Especially during the summer, the kitchen must be kept ventilated. It is time to open the window; in winter, when several people use the water heater continuously to take a bath, they should maintain a certain time interval to avoid accidents caused by the exchange of indoor air.

Use qualified burning appliances

Be sure to use qualified gas appliances that meet national standards and use of infrared stoves is prohibited.

The information in this article comes from the Internet and was reorganized and edited by China Rescue Equipment Network.

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