Is it in line with standard requirements to consider a combustible gas concentration of less than 10 LEL as meeting the conditions for hot work during hot work analysis?
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Hot work: Some enterprises consider a combustible gas concentration of less than 10% LEL as meeting the conditions for hot work during hot work analysis. Is this in compliance with standard requirements?
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The lower explosive limit is greater than 4%, and the oxygen content in the system is less than 5%; the lower explosive limit is less than 4%, and the oxygen content in the system is less than 2%
This post was last edited by Shutong on 2023-7-24 07:27. LEL stands for the lower explosive limit of flammable gases (vapors); it is not a unit but rather a specific value, and the LEL for each flammable gas (vapor) is different. After conversion, it was found that the 10% LEL value for most of the combustible gases (vapors) commonly used in actual operations meets the criteria established by this standard for passing the hot work analysis for such gases (vapors); however, there are still some that do not meet these requirements. Therefore, the acceptable criteria for combustible gas analysis specified in this standard shall be applied. When using a portable combustible gas detector to detect and analyze combustible gases (vapors), if the unit of the value displayed by the detector is %LEL, it is necessary to convert this value in accordance with the acceptable criteria for gas analysis specified in this standard