City Gas Safety Accident Analysis and Preventive Measures

In recent years, China's urban gas industry has developed rapidly, and urban gas has been rapidly popularized. The use of urban gas has increased significantly. This aspect has promoted rapid economic growth, improved the quality of life of residents, and reduced environmental pollution; on the other hand, more and more gas accidents have also caused huge losses to residents' lives and property, becoming a concern for the gas industry. Hot spots.

If city gas is operated in strict accordance with national standards, technical specifications, and operating procedures, safety is generally guaranteed under normal circumstances. The occurrence of various types of urban gas safety accidents occurs under conditions of abnormal external conditions, man-made negligence, or vandalism, such as earthquakes, lightning strikes and other force majeure gas storage, transmission and distribution system leaks, explosions; equipment and facilities lack of maintenance and Failures, gas safety accidents caused by operational errors of staff, and gas safety accidents caused by various types of man-made destruction of gas infrastructure.

I. Examples of Gas Safety Accidents

February 3, 2015 Gas explosion Haidian District, Beijing residents in one of the households in the windows were shattered, broken kitchen part of the wall, but fortunately the accident caused no casualties. The cause of the accident was that the owner forgot to turn off the heat when cooking food. Water spilled from the pot led to gas leaks. When the owner opens the faucet and water heater in the restroom, it triggers an explosion.

July 20, 2015, the medical campus of Lanzhou University Hospital South Campus, gas deflagration accident occurred. A total of 31 people were slightly injured. The cause of the accident was that the construction party destroyed the DN80 steel gas pipeline in the artificial gas era that had been plugged during the demolition operation , resulting in the leakage of natural gas and the resulting deflagration.

November 17, 2015, Dalian City Xigang a residential home, due to boil water to extinguish gas, octogenarian old couple a pair of smoked found dead at home. According to the official, there were cases where water was used to extinguish the gas in the elderly before, and there were no gas alarms in the elderly. It is understood that in more than a month, three gas poisoning accidents occurred in one community in the city , causing serious consequences of six deaths and three injuries, and three accidents were caused by improper use of gas.

All these accidents have caused huge losses to the life and property of the country and the people. They have also brought a great negative impact on the public safety and stability of the society. They have caused management and users at all levels to pay great attention to the safety management of urban gas. The importance of use.

Second, the cause of the accident

2.1 Non-tempered safety explosion-proof devices before gas appliances There are no tempered safety explosion-proof flame arresters in China's urban pipeline gas and all civilian gas pipelines including liquefied petroleum gas cylinders. At present, some industrial countries in the world have produced and used various kinds of industrial and civilian flame arresters for the absolute safety of gas equipment and personnel, which is worth learning and learning from gas engineering technicians in China.

2.2 Pipeline gas

The main source of gas supply by pipeline is natural gas and gas. In this way, gas supply equipment usually consists of pipelines, gate stations, high-voltage stations, pressure regulating devices, and ancillary equipment on pipelines. Because the pipeline is a concealed project, over time, ground subsidence, aging of the pipeline, and other unforeseen reasons can cause air to enter the pipe. The carrier medium itself is flammable and explosive, and it is in a certain pressure state, so it is relatively large. The risk of fire. The annual occurrence of pipeline gas explosions in China is relatively frequent. The reasons for analysis are mainly the following three aspects.

( 1 ) Aging and serious corrosion of pipeline equipment. Some pipelines have never been tested and maintained for decades, and their safety and reliability cannot be determined. In many cities, the gas pipeline network has changed along with the needs of the city's construction. The location of local pipelines has changed, and roads have been widened. The gas pipelines are placed under the lanes, which can easily lead to pressure damage and gas leakage. In addition, the leakage of the medium can also be caused by the loose connection of valves and flanges.

( 2 ) Pressure relief devices, rupture disks, explosion-proof membranes, etc. on the carrier equipment do not work. Electrical equipment in the hazardous area is not explosion-proof. There is no lightning protection, anti-static electricity, or although it does not work.

( 3 ) Safety responsibilities and management measures are not implemented, safety organizations and rules and regulations are not implemented , and operating procedures are violated.

2.3 Human factors

( 1 ) Carelessness, when staff left the kitchen for a long time forget to close the valve or lax valve leads to a large number of gas leaks.

( 2 ) An erroneous operation, accustomed to the use of gas, etc., does not obey the fire, etc.; causes leakage of gas before ignition.

( 3 ) Lax management, illegal storage, improper use. Especially some catering business establishments.

( 4 ) 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.

Third, the city gas safety accident prevention measures

In order to avoid the occurrence of gas explosion accident, to remind customers:

1. Gas stoves with flameout protection devices manufactured by regular manufacturers should be used when selecting gas cookers, and gas leakage alarm devices should be installed in rooms where natural gas is used. At the same time, accidental fans are installed in conjunction with alarm devices. When the gas cooker is not used for a long time, turn off the gas valve.

2. Lightning prevention and anti-static grounding facilities shall be provided at the entrance and exit of the gas pipelines to and from the building, outdoor roof pipes, risers, discharge pipes, inlet pipes and gas equipment.

3 , when using natural gas to be guarded, boil water, boiled milk, porridge when the containers do not install too full to prevent the overflow will be the furnace to extinguish the leak. Prolonged use of gas can make the indoor oxygen insufficient and should maintain good indoor ventilation.

4. The hose is prone to ageing after being used for a long time. It is recommended that the user replace it regularly and fix the hose with the clamp.

5. Do not store flammable or explosive materials in the room where gas facilities are installed, nor can it contain a second source of fire; do not bundle, hang and store items on gas facilities.

6. When carrying out interior decoration, do not move the gas facilities by yourself; otherwise, the airtightness of the original gas facilities will be damaged; the gas meters, gas pipelines, and gas valves will not be sealed so as to avoid hiding potential safety hazards. You can find a gas company to start construction.

7. In order to facilitate the identification of natural gas leaks, an odor agent is added to the gas. After the gas leaks, there will be a rotten egg smell. If the user smells this odor at home, there is a possibility that the gas leaks. Do not operate the home at this time. The electrical switch and dialing the phone cannot use an open flame. Close the valve in time, open the doors and windows for ventilation, and quickly leave the site for repair.

In many cases, disasters can be avoided. People often suffer incalculable losses due to one-time negligence. As long as we pay attention to these small details in our daily lives, we can avoid the occurrence of danger in a timely manner.

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