What is the upper flammable limit percentage of natural gas?

The upper flammable limit (UFL) of natural gas indicates the maximum concentration of gas in air that can ignite or burn. When the concentration exceeds this limit, there is not enough oxygen to sustain combustion. For natural gas, the upper flammable limit is typically around 15%. This means that if the concentration of natural gas in the air exceeds 15%, it will be too rich to ignite.

Understanding the UFL is essential for safety in handling natural gas, as it helps in assessing the risk of fire or explosion in environments where gas is present. Proper ventilation and monitoring of gas concentrations help maintain levels below this upper limit, ensuring safety in both residential and industrial settings.