LPG has an explosive concentration range of what percentage?

LPG has an explosive concentration range of what percentage?

• A. 1.5-10%
• B. 0-5%
• C. 10-20%
• D. 1-3%

Answer: (A)

Understanding how LPG behaves in air means recognizing that a fuel–air mixture will ignite only if its concentration sits between the lower and upper flammable limits. For LPG, those limits are about 1.5% to 10% by volume in air. Below roughly 1.5% the mixture is too lean to burn, and above roughly 10% there isn’t enough oxygen relative to fuel to sustain a flame. So the practical explosive range is around 1.5% to 10%, which is why that option is the best match. Other ranges either miss the lower limit or the upper limit, implying ignition could occur outside LPG’s actual flammable range.

Understanding how LPG behaves in air means recognizing that a fuel–air mixture will ignite only if its concentration sits between the lower and upper flammable limits. For LPG, those limits are about 1.5% to 10% by volume in air. Below roughly 1.5% the mixture is too lean to burn, and above roughly 10% there isn’t enough oxygen relative to fuel to sustain a flame. So the practical explosive range is around 1.5% to 10%, which is why that option is the best match. Other ranges either miss the lower limit or the upper limit, implying ignition could occur outside LPG’s actual flammable range.