Method and apparatus for replacing damaged section of a subsea pipeline without loss of product or entry of seawater
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United States of America Patent
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Jun 5, 2001
Grant Date -
N/A
app pub date -
Mar 16, 1999
filing date -
Mar 17, 1998
priority date (Note) -
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Abstract
A method and apparatus for repairing a submerged pipeline. The method comprises installing a pair of hot tap tees on either side of the damaged section of pipeline, cutting a hole in the pipeline through each hot tap tee, inserting and securing plugging pigs into the pipeline, cutting and removing the damaged section of pipeline, and installing a new section of pipeline. The apparatus includes a plugging pig for use during repair of a damaged pipeline comprising a body shaft, a cup seal secured to the body shaft for engaging an interior wall of the pipeline, a cam attached to the exterior of the body shaft, a slip assembly for sliding on the cam and engaging a slip against the pipeline wall, and a control mechanism for engaging and releasing the slip from the wall.
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