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1.1 Scope. 1.1.1* This standard shall apply to the safeguarding of tanks or containers operating at nominal atmospheric pressure that contain or have contained flammable or combustible liquids or other hazardous substances and related vapors or residues. A.1.1.1 The procedures in this standard can also apply to pressurized tanks or pressurized containers that have been taken out of service and have had their operating pressure reduced to atmospheric pressure and are vented to atmosphere. 1.1.2* This standard shall not apply to tank vehicles or tank cars; tanks, bunkers, or compartments on ships or barges or in a shipyard; gas plant equipment or gas distribution systems for natural or manufactured gas; or compressed or liquefied gas cylinders. A.1.1.2 Procedures for making some of the tanks and containers listed in 1.1.2 safe are covered separately in the following publications: (1) AGA, Purging Principles and Practices (2) ANSI Z117.1, American National Standard Safety Requirements for Confined Spaces (3) API 1631, Interior Lining and Periodic Inspection of Underground Storage Tanks (4) API 2009, Safe Welding, Cutting, and Hot Work Practices in the Petroleum and Petrochemical Industries (5) API 2015, Requirements for Safe Entry and Cleaning of Petroleum Storage Tanks (6) API 2016, Guidelines and Procedures for Entering and Cleaning Petroleum Storage Tanks (7) API 2217A, Guidelines for Work in Inert Confined Spaces in the Petroleum Industry (8) API 2207, Preparing Tank Bottoms for Hot Work (9) API 2027 Ignition Hazards Involved in Abrasive Blasting of Atmospheric Storage Tanks in Hydrocarbon Service (10) NFPA51B, Standard for Fire Prevention During Welding, Cutting, and Other Hot Work (11) NFPA 306, Standard for the Control of Gas Hazards on Vessels (12) OSHA 29 CFR 1910.146, “Permit-Required Confined Spaces” (13) OSHA 29 CFR 1910.147, “Control of Hazardous Energy (Lockout/Tagout)” 1.1.3* This standard shall not apply to hot tapping. A.1.1.3 Procedures for hot tapping are covered separately in API 2201, Procedures for Welding or Hot Tapping on Equipment in Service. 1.1.4* This standard shall not apply to the entry of a tank or container that contains an inert atmosphere. A.1.1.4 For information on working in an inert atmosphere, see API 2217A, Guidelines for Work in Inert Confined Spaces in the Petroleum Industry.
This standard outlines procedures to safeguard tanks or containers operating at nominal atmospheric pressure that contain or have contained flammable and combustible liquids or other hazardous substances before entry, cleaning, repair, or other activities can be performed.
Described in the logical order in which work is typically conducted, provisions cover basic precautions; preparation for safeguarding such as lockout/tag out, removal of hazardous substances, and isolation; testing procedures, control or removal of vapors, inspection and certification of tanks and containers, procedures for access to and entry of tanks, and cleaning tanks and containers.
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