Propane: LFL & UFL, YOU NEED TO KNOW!

The ignition mixtures for propane in oxygen refer to the fuel-to-oxygen ratios at which propane can ignite and sustain combustion. Specifically, there are two important ratios to consider:

1. Lower Flammability Limit (LFL): The lower flammability limit, also known as the lower explosive limit (LEL), is the minimum concentration of propane in an oxygen-rich environment below which the mixture is too lean to sustain combustion. For propane, the LFL is approximately 2.1% propane by volume in an oxygen-rich atmosphere.

2. Upper Flammability Limit (UFL): The upper flammability limit, also known as the upper explosive limit (UEL), is the maximum concentration of propane in an oxygen-rich environment above which the mixture is too rich to sustain combustion. For propane, the UFL is approximately 9.5% propane by volume in an oxygen-rich atmosphere.

To achieve proper combustion, it is important to maintain the propane-oxygen mixture within the flammability range, which lies between the LFL and UFL. The ideal ratio for complete combustion is often referred to as the stoichiometric ratio, which is around 4.3% propane by volume in an oxygen-rich atmosphere.

It's important to note that these values can vary depending on factors such as temperature, pressure, and the presence of other gases or impurities. Additionally, safety considerations and precautions should always be followed when handling and working with flammable gases to minimize the risk of fire or explosion.

When using propane or any fuel gas, it is essential to follow proper safety protocols, consult relevant safety guidelines, and ensure compliance with local regulations to maintain a safe working environment.