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0 0 <br /> A2.5.2 UPPER FLAMMABLE LIMIT - The A2.9 PURGING - The method by which gases, <br /> maximum concentration of a flammable vapor in vapors, or other airborne impurities are <br /> air or oxygen that will ignite if an ignition source displaced from a confined space. <br /> is applied. <br /> A2.10 QUALIFIED PERSON - A person <br /> A2.5.3 FLAMMABLE RANGE - The range of designated by the employer, in writing, as <br /> concentrations of flammable vapor in air or capable by education and/or specialized training <br /> oxygen, between and inclusive of the lower of anticipating, recognizing, and evaluating <br /> flammable limit and upper flammable limit, that employee exposure to hazardous substances or <br /> will propagate flame or explosion if ignited. other unsafe conditions in a confined space, <br /> capable of specifying necessary control and/or <br /> protective action to ensure workers safety, and <br /> A2.6 LOCKED OUT - The disconnecting or knowledgeable of the procedures described in <br /> locking of electrical switches or connections in this standard. <br /> the off position to prevent accidental activation <br /> of electrical equipment that may create a <br /> hazardous condition to the worker(s) <br /> performing work in or around the tank. A2.11 RUST PLUG - A deep pit or complete <br /> perforation which is filled with corrosion <br /> byproducts and thereby temporarily sealed. <br /> A2.7 HOT WORK - Any work capable of <br /> producing a source of ignition including,but not A2.12 STANDBY PERSON - A person trained <br /> limited to, burning, welding, riveting, grinding, in emergency rescue procedures and assigned <br /> drilling, saw cutting, abrasive blasting, and to remain on the outside of the confined space <br /> space heating. and to be in communication with those working <br /> inside. <br /> A2.13 SPECIAL INSPECTOR - A special <br /> A2.8 PERFORATION - A hole in a tank (other inspector is a person that is trained, tested, and <br /> than those which are a part of the certified by the National Leak Prevention <br /> manufacturing process such as bung holes). Association as competent in regard to the <br /> Perforations are measured after the edges have requirements specified by this Standard. <br /> been reamed so that no portion of the <br /> perforation edge has less than '/8th inch of metal <br /> thickness. Perforations may exist in the form of A2.14 STATIC ELECTRICITY - The <br /> holes prior to abrasive blasting operations or electrification of materials through physical <br /> may open up as a result of abrasive blasting due contact and separation, and the various effects <br /> to the cleaning of rust plugged holes or the that result from the positive and negative <br /> piercing of minute areas of thin metal caused by charges so formed, particularly where they <br /> pitting. Often, a tank will not have leaked constitute a fire or explosion hazard. <br /> product even when a perforation is present. <br /> A2.15 SELF-CONTAINED BREATHING <br /> APPARATUS-A portable respiratory <br /> 7 <br />