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Current as of 1999-10-01 Government source

Pipeline and Hazardous Materials Safety AdministrationOfficial agency material

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Welding, flame cutting, and similar operations are prohibited, except at times and places that the operator designates in writing as safe and when constantly supervised in accordance with ANSI/NFPA-51B.

[45 FR 9203, Feb. 11, 1980, as amended at 58 FR 14522, Mar. 18, 1993]