What happens when the lower explosive limit (LEL) exceeds 10%?

When the lower explosive limit (LEL) exceeds 10%, it indicates that the concentration of flammable gas or vapor in the air is significant enough to pose a serious risk of explosion or fire. The LEL represents the lowest concentration of the substance that could ignite if an ignition source is present. If this threshold is exceeded, it is essential to consider the safety of personnel.

In situations where the concentration surpasses this critical level, the protocol is to prohibit any personnel from entering the space. This measure is taken to ensure the safety of individuals and to prevent potentially catastrophic incidents resulting from the ignition of flammable materials. Therefore, the requirement that no personnel shall enter the space when the LEL exceeds 10% is a critical safety protocol aimed at protecting lives and preventing hazardous conditions.

In contexts where safety regulations are enforced, this restriction is aligned with standard operational procedures, emphasizing the importance of maintaining a safe working environment.