Apparatus for venting an annular space between a liner and a pipeline of a subsea riser
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United States of America Patent
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Jan 1, 2013
Grant Date -
May 6, 2010
app pub date -
Feb 8, 2008
filing date -
Apr 5, 2007
priority date (Note) -
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Abstract
An apparatus for venting an annular space between a liner and a pipeline of a subsea riser used for conveying hydrocarbons, the apparatus comprising a permeate recovery device for recovering permeate passing through the liner into the annular space. The permeate recovery device includes a first vent port in a wall of the pipeline at or adjacent a lower region of the pipeline and communicating with a permeate recovery line defining a flow path between the annular space and a permeate collection vessel. A one-way valve is associated with the permeate recovery line for preventing flow from the permeate recovery line into the annular space. A gaseous permeate recovery line connected to a second vent port at an upper region of the pipeline defining a flow of gaseous permeate from the annular space.
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