What is the lower flammable limit percentage of natural gas?

The lower flammable limit (LFL) percentage of natural gas is approximately 5%. This means that natural gas will ignite only when its concentration in the air is between 5% and about 15%. If the concentration is below 5%, there isn’t enough gas to support combustion; hence, it is considered too 'lean' to burn effectively.

Understanding the LFL is critical in safety and operational contexts, as it helps establish safe handling and storage practices for natural gas. Recognizing that concentrations below this threshold do not pose a fire hazard is vital for anyone working with or around this fuel. Knowing the exact percentage allows professionals to assess work environments and implement proper safety measures.