Definition(s)
LEL
Lower explosive limit (LFL preferred).
Source: API RP 14F, Design, Installation, and Maintenance of Electrical Systems for Fixed and Floating Offshore Petroleum Facilities for Unclassified and Class 1, Division 1 and Division 2 Locations, Fifth Edition, July 2008. Global Standards
Source: API RP 49, Recommended Practice for Drilling and Well Servicing Operations Involving Hydrogen Sulfide, Third Edition, May 2001. Global Standards
Source: NOPSEMA Guidance note: Hazard Identification, N-04300-GN0107, Australia, Revision 5, December 2012. Regulatory Guidance
LEL
Lower explosion limit.
Source: API STD 689, Collection and Exchange of Reliability and Maintenance Data for Equipment, First Edition, July 2007. Global Standards
LEL
lower explosive (flammable) limit.
Source: API RP 98, Personal Protective Equipment Selection for Oil Spill Responders, First Edition, August 2013. Global Standards
LEL
Minimum concentration of combustible gas or vapor in air (expressed in percent of gas or vapor in air by volume) below which propagation of flame does not occur on contact with an ignition source.
NOTE Lower flammable limit (LFL) is synonymous with lower explosive limit (LEL).
Source: API RP 98, Personal Protective Equipment Selection for Oil Spill Responders, First Edition, August 2013. Global Standards