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Drill string safety valve<br />
A spare drill pipe safety<br />
valve should be readily<br />
available (i.e. stored in<br />
open position with wrench<br />
accessible) on the rig floor<br />
at all times.<br />
This valve or valves should<br />
be equipped to screw into<br />
any drill string member in<br />
use.<br />
The outside diameter of the<br />
drill pipe safety valve should<br />
be suitable for running in the<br />
hole.
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