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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.*

*This is an abridged version of the Dictionary of Petroleum Terms used with permission from PETEX®, The University of Texas, at Austin. All rights reserved © PETEX 2001.