As a combustible gas, natural gas can burn together with air to release a large amount of heat under normal conditions. The normal natural gas combustion process is relatively stable and controllable. However, if in a space with no air circulation, after natural gas leaks, it will gather in the room. When the concentration of natural gas exceeds 5%, once it encounters an open flame or an electric spark, the natural gas will immediately burn uncontrollably and violently , and then the volume expansion triggers an explosion.
Natural gas itself is colorless and odorless. In order to make people aware of natural gas leakage, hydrogen sulfide or odorous chemicals containing mercapto groups are added to natural gas for residential use. If there is a gas leak, we will smell something like rotten eggs.
When natural gas leaks, it mainly contains the following gases:
Methane (CH4): Methane is the main component of natural gas and usually accounts for the majority of natural gas, so it dominates natural gas leaks. It is a colorless, odorless, non-toxic gas but can be explosive in high concentrations.
Ethane (C2H6): Ethane is usually a minor component of natural gas, but is also released along with methane. It is a flammable gas that can cause fire or explosion.
Nitrogen (N2): Nitrogen is one of the main components of air and is usually released with natural gas. Nitrogen itself is not flammable, but it can reduce oxygen concentrations, thereby reducing the risk of fire or explosion.
Carbon monoxide (CO): Carbon monoxide is a toxic gas that may be produced when natural gas burns incompletely. It is a colorless, odorless gas, but inhaling high concentrations of carbon monoxide can be harmful or even fatal to the human body.
Hydrogen sulfide (H2S): Hydrogen sulfide is a toxic gas that is often found in trace amounts in natural gas. Inhalation or exposure to high concentrations of hydrogen sulfide can cause serious harm to the human body, even fatal.
The main dangers of natural gas leaks come from the explosive nature of methane and the toxicity of toxic gases such as carbon monoxide and hydrogen sulfide, so appropriate safety measures need to be taken when dealing with natural gas leaks.
If we are away from a natural gas source, or if we are asleep, we may not smell natural gas. For safety reasons, you can install a natural gas alarm or Combustible Gas Leak Detector in the kitchen.
The leakage of natural gas generally occurs at the interface, and the condition of the gas appliances in the home should be checked regularly. Old burning appliances should be replaced in time to prevent pipelines and connections from aging, and the gas company will also regularly check natural gas pipelines.