Oct 11, 2023 · The minimum required amount of a particular combustible gas or vapour necessary to support its combustion in air is defined as the Lower Explosive Limit (LEL) for that specific gas. Below this level, the mixture of gas and oxygen is too “thin” to burn.

LEL (Lower Explosive Limit) is the minimum concentration of a gas or vapor in the air needed to ignite. UEL (Upper Explosive Limit) is the maximum concentration where combustion can occur. Below the LEL, the mixture is too lean to burn; above the UEL, it’s too rich.

Explosive limits give the concentration range of a fuel (gas/vapor) that will cause an explosion or fire in the presence of an igniting source. There are two kinds of explosive limits that are widely used; LEL or Lower Explosive limits and UEL or Upper Explosive limits.

The minimum concentration of a particular combustible gas or vapor necessary to support its combustion in air is defined as the Lower Explosive Limit (LEL) for that gas. Below this level, the mixture is too “lean” to burn. The maximum concentration of a gas or vapor that will burn in air is defined as the Upper Explosive Limit (UEL).

The limits are commonly called the "Lower Explosive or Flammable Limit" (LEL/LFL) and the "Upper Explosive or Flammable Limit" (UEL/UFL). The lower and upper explosion concentration limits for some commonly used gases are indicated in the table below.

Nov 10, 2016 · LEL vs UEL. Based on illustration above we can see that Lower Explosive Limit (LEL) is minimum concentration of combustible gas that lead to burn. Below this concentration, gas is too lean too burn. On the other hand, Upper Explosive Limit (UEL) is maximum concentration of combustible

The maximum concentration of a gas or vapor that will burn in air is defined as the Upper Explosive Limit (UEL). Above this level, the mixture is too "rich" to burn. The range between the LEL and UEL is known as the flammable range for that gas or vapor.

Jun 21, 2021 · LEL and UEL are the abbreviations of “Lower Explosive Limit” and “Upper Explosive Limit”, respectively. (Also used as LFL and UFL, which stands for Lower Flammability Limit and Upper Flammability Limit.) These measurements are useful in specifying the amount of flammable-explosive gases.

The thresholds required for combustion to take place with fuels are referred to as the Lower Explosive Limits (LEL) and the Upper Explosive Limits (UEL). While the threshold for energy is referred to as the Minimum Ignition Energy (MIE) Ignition Curve of a Typical Combustible Fuel.

What is the difference between LEL and UEL? While LEL (Lower Explosive Limit) refers to the minimum concentration of a flammable gas or vapor for ignition, UEL (Upper Explosive Limit) is the maximum concentration. Above the UEL, the mixture is too rich to ignite. Both LEL and UEL define the explosive range for a particular substance.