What is the explosive concentration range for LPG in air?

What is the explosive concentration range for LPG in air?

• A. 0.5% to 5%
• B. 1.5% to 10%
• C. 5% to 15%
• D. 10% to 20%

Answer: (B)

The explosive (flammable) range is the concentration of LPG in air at which it can ignite if an ignition source is present. This range is set by the lower explosive limit (LEL) and the upper explosive limit (UEL). Below the LEL the mixture is too lean to burn; above the UEL there isn’t enough oxygen or the mixture is too rich to sustain flame. For LPG, which is mainly propane and butane, the LEL is about 1.5–2% by volume in air and the UEL is about 10% by volume. So the explosive range is roughly 1.5% to 10% in air, though exact values can shift a bit with composition, temperature, and pressure. So, when you see a range like 1.5% to 10%, that aligns with the typical flammable interval for LPG.

The explosive (flammable) range is the concentration of LPG in air at which it can ignite if an ignition source is present. This range is set by the lower explosive limit (LEL) and the upper explosive limit (UEL). Below the LEL the mixture is too lean to burn; above the UEL there isn’t enough oxygen or the mixture is too rich to sustain flame.

For LPG, which is mainly propane and butane, the LEL is about 1.5–2% by volume in air and the UEL is about 10% by volume. So the explosive range is roughly 1.5% to 10% in air, though exact values can shift a bit with composition, temperature, and pressure.

So, when you see a range like 1.5% to 10%, that aligns with the typical flammable interval for LPG.