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Any work involving burning, welding, <br /> • Aot Work riveting, or similar fire producing <br /> operations, as well as work which produces a <br /> source of ignition, such as drilling, <br /> abrasive blasting, and space heating. <br /> Displacement of the atmosphere by a non <br /> - <br /> Inerting reactive gas (such as nitrogen) to such an <br /> extent that the resulting atmosphere is <br /> noncombustible. <br /> Isolation A process whereby the confined space is ' <br /> removed from service and completely <br /> protected against the inadvertent release of <br /> material by the following: blanking off <br /> (skillet type metal blank between flanges) , <br /> misaligning sections of all lines and pipes, <br /> a double block and bleed system, electrical <br /> lockout of all sources of power, <br /> and <br /> blocking or disconnecting all mechanical <br /> linkages. <br /> Lower Flaamable Limit (LF'i.) The minimum concentration of a combustible <br /> gas or vapor in air (usually expressed <br /> dwiin <br /> percent by volume at sea level) , <br /> which ll <br /> ignite if an ignition source (sufficient <br /> ignition energy) is present. <br /> oxygen Deficiency Refers to an atmosphere with a partial <br /> pressure of oxygen (PO2) less than 132 mm <br /> R8. Normal air at sea level contains <br /> approximately 21% oxygen at a P02 of 160 mm <br /> Ag. At an altitude <br /> 802feet <br /> normal <br /> air <br /> of <br /> contains approximately 21% <br /> 132 mm Hg. <br /> Any oxygen concentration greater than 25% <br /> oxygen Enriched Atmosphere (PO2 - 190 mm Hg) at normal atmospheric <br /> pressure. <br /> The maximum 8-hour time weighted average of <br /> Permissible Exposure Limit (PEL) any airborne contaminant to which an <br /> employee may be exposed. At no time shall <br /> the exposure level exceed the ceiling <br /> concentration for that contaminant as listed <br /> in 29 CFR Part 1910 Sub Part Z. <br /> The method -by which gases, vapors, or other <br /> Purging airborne impurities are displaced from a <br /> confined space <br /> . <br /> A person designated by the employer, in <br /> Qualified Yerson education and/or <br /> writing, as capable (by <br /> specialised training) of anticipating, <br /> r =ing, and evaluating employee <br />