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<br />_ .... , .. . . ..,.v, .. ,..,,.. <br />,.IN <br />IF <br />1. The presence of a flammable gas, vapor, or mist in excess of 10 % of the <br />LEL. <br />? 2. Airborne combustible dust at a concenuation that exceeds its <br />LEL. (Note: <br />This concentration may be approximated as a condition in which the dust <br />? obscures vision at a distance of 5 feet or less.) <br />? 3. Any oxygen concentration below 19.5 % or above 23.5 %. <br />4. Any atmosphenc condition recognized as IDLH. <br />? 5. An atmospheric concentration of any substance above its PEL. <br />F. Entry - Passing through an opening into a permit-required confined space. Entry <br />is considered to have occuned as soon as any part of the entrant's body breaks <br />the plane of an opening into the space. <br />? G. Entry Supervisor - The employee assigned the overall responsibility for the safe <br />confined space operation. The entry supervisor must be familiar with the <br />? operation and its hazards, must insure that all appropriate tests have been <br />conducted before endorsing the entry form, verify availability of rescue services, <br />control access to the space during operations, and insure continued operational <br />? compliance during any transfer of responsibilities/personnel. <br />H. LEL (Lower Explosive Limit) - Minimum concentration of a combustible gas, <br />? vapor, or mist in air that will ignite if an ignition source is present. <br />J. INISDS (Material Safety Data Sheet) - A document prepared by the manufacturer <br />or importer of a chemical material which lists its fire, physical and health <br />hazards, as well as, recommended workplace controls and personal protective <br />equipment. <br />K. Non-Permit ConfinEd Space - A confined space that does not contain or, with <br />respect to atmospheric hazards, have the potential to contain any hazard capable <br />of causing death or serious physical harm. <br />L. Oxygen Deficiency - An atmosphere containing less than 19.5 percent oxygen by <br />volume. Normal air contains approximately 21 % oxygen. For the purpose of <br />this procedure, any atmosphere containing less than 19.5 % oxygen by volume <br />shall be considered oxygen deficient and IDLH. <br />M. Permissible Exposure Limit (PEL) - The maximum time weighted average <br />concentration of a substance to which an employee can be exposed 8 hours a day, <br />5 days a week for a working lifetime, without harmful effects. PELs are <br />3