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Annular Blowout Preventer

Annular Blowout PreventerA large valve, usually installed above the ram preventers, that forms a seal in the annular space between the pipe and well bore. If no pipe is present, it forms a seal on the well bore itself. See blowout preventer.


 
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Occupational Safety & Health Administration
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Washington, DC 20210		 Page last updated: 06/10/2009