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Appendix 1.0 continued <br /> Flammable Liquid- <br /> Any liquid having a flash point below 100°F, having a vapor pressure not exceeding 40 pounds <br /> per square inch (absolute) at 100°F. <br /> Locked Out- <br /> The disconnecting or locking of electrical switches or connections in the off position to prevent <br /> accidental activation of electrical equipment that may create a hazardous condition to the <br /> worker(s) performing work in or around the tank. <br /> Oxygen Deficiency- <br /> Exists if the atmosphere contains less than 19.5%oxygen. <br /> Purging- <br /> The method by which gases,vapors or other airborne impurities are displaced from a confined <br /> space. <br /> Qualified Person- <br /> Refers to the person who has been designated to direct the work of the other employees <br /> involved in performing a specific task. <br /> Rust Plug- <br /> A deep pit or complete perforation which is filled with corrosion byproducts and thereby <br /> temporarily sealed. <br /> Special Inspector- <br /> A special inspector is a person that is trained,tested and certified as competent in regard to the <br /> requirements specified by the Standard. <br /> Standby- <br /> Refers to the person who is assigned to maintain surveillance on workers inside an enclosed or <br /> confined space and assures that blinds or other equipment are not altered which could affect <br /> the safety of the persons inside the space. <br /> Supervisor- <br /> Refers to the person who oversees the operation of the facility where the work is being <br /> performed.This may be the facility supervisor or his written designate. <br /> 2/99 <br /> Page 23 of 30 <br />