§ 250.511. Traveling-block safety device.
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/us/cfr/t30/s§ 250.511·A research copy — for the controlling text, always check the official state or federal source. Not legal advice.
All units being used for well-completion operations that have both a traveling block and a crown block must be equipped with a safety device that is designed to prevent the traveling block from striking the crown block. The device must be checked for proper operation weekly and after each drill-line slipping operation. The results of the operational check must be entered in the operations log.