Definition(s)
PEL
Permissible exposure limit.
Source: API RP 49, Recommended Practice for Drilling and Well Servicing Operations Involving Hydrogen Sulfide, Third Edition, May 2001. Global Standards
Source: API RP 98, Personal Protective Equipment Selection for Oil Spill Responders, First Edition, August 2013. Global Standards
PEL
Exposure limit that is published and enforced by OSHA as a legal standard (see 29 CFR 1910.1000, Subpart Z), expressed as 8-hour TWAs, ceiling values, and STELs.
Source: API RP 98, Personal Protective Equipment Selection for Oil Spill Responders, First Edition, August 2013. Global Standards