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API RP 2207-2017 pdf free download

API RP 2207-2017 pdf free download.Preparing Tank Bottoms for Hot Work.
3 Terms, Definitions, Acronyms, and Abbreviations 3.1 Terms and Definitions For the purposes of this document, the following definitions apply. 3.1.1 acute hazard Capable of causing effects occurring from exposure over a short time, usually within minutes or hours. An acute exposure can result in short-term or long-term health effects. 3.1.2 chronic health hazard Capable of causing effects occurring from exposure over a long period of time (often at low-level concentrations). 3.1.3 competent person A person identified by the employer as being capable of identifying existing and predictable hazards in the surroundings or working conditions that are unsanitary, hazardous, or dangerous to personnel, and who has authorization to take prompt corrective measures to eliminate them. NOTE 1 See OSHA 29 CFR 1926.32. NOTE 2 The concept of“competent person” is perfomance based and relative to the context of the work to be done (see also“qualified person”). OSHA 29 CFR 1926.1200 also has definitions of“competent person” and“qualifed person.’ 3.1.4. confined space Any tank or space that meets all three of the following requirements: is large enough and so configured that a person can bodily enter and perform assigned work; – has limited or restricted means for entry or exit (e.g. tanks and vessels, storage bins, hoppers, vaults, and pits are spaces that may have limited means of entry or exit); and is not designed for or meant to be continuously occupied by personnel.
3.1.5 double block and bleed The positive closure of a line or pipe by closing and locking or tagging two in-line valves and by opening and locking or tagging a drain or vent valve in the line or pipe between the two closed valves. NOTE 1 OSHA 29 CFR 1926. 1200 also has a defnition of “double block and bleed.” NOTE 2 Employers may evaluate and designate a single valve that uses two sealing surfaces with a drain orifice between them as satisfying double block and bleed requirements. 3.1.6 fume Small diameter particulate matter formed by condensation of vaporized high molecular weight materials (such as metals) from the gaseous state. Although they are solids, fumes are small enough to behave like gases. NOTE Welding can generate fumes. 3.1.7 hazard An inherent chemical or physical property or situation with the potential to do harm (flammability, toxicity, corrosivity, stored chemical or mechanical energy). NOTE OSHA 29 CFR 1926.1200 also has a definition of “hazard.” 3.1.8 hazardous atmosphere An atmosphere that has the potential to expose entrants to the risk of death, incapacitation, impairment of ability to self-rescue (escape unaided from a confined space), injury, or acute ilness from one or more of the following causes. a) Flammable gas, vapor, or mist in excess of 10 % lower explosive limit (LEL). b) Airborne combustible dust at a concentration that meets or exceeds 80 % of its LEL. NOTE The LEL may be approximated as a condition in which the dust obscures vision at a distance of5 ft (1.5 m) or less.
3.1.11 lockout/tagout The placement of a lockout or tagout device on an energy isolating device in accordance with an established procedure to ensure that the energy isolating device and the equipment being controlled are not operated until the lockout or tagout device is removed. NOTE OSHA 29 CFR 1926. 1200 also has a definition of “lockout.” 3.1.12 lower explosive (flammable) limit LEL The minimum concentration (expressed as a volume percentage) of a vapor-in-air below which propagation of flame does not occur on contact with an ignition source; generally considered to be “too lean to burn.” NOTE OSHA 29 CFR 1926.1200 also has a definition of “lower explosive limit.’ 3.1.13 nonconfined space A tank (space) that does not meet the requirements for a confined space and has been classified as a nonconfined space following the employer’s confined space program requirements. A nonconfined space may also be a space that was previously classified as a PRCS or a non-PRCS and that no longer meets any one or more of the requirements to be classifed as either a PRCS or a non-PRCS. NOTE 1 OSHA 29 CFR 1926. 1200 also has definitions of “confined space,” “permit required confined space,” and “non-pemmit-required confined space.’

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