Methods of fitting linings in pipelines
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United States of America Patent
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N/A
Issued Date -
Apr 24, 2003
app pub date -
Oct 18, 2002
filing date -
Oct 19, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method of fitting a lining in a pipeline is disclosed comprising the steps of providing a flexible tubular liner having a cross section sized to fit the pipeline, attaching a pig which is a close fit in the pipeline to an end of the liner and locating the pig in the pipeline. The liner is compacted to a reduced cross-section on or prior to entry to the pipeline to facilitate passage of the liner along the pipeline, and a fluid pressure is applied to the pig to cause the pig to pass along the pipeline and, to draw the liner into the pipeline. The pig is removed from the pipeline and the liner restored to its original cross-section to engage around the inner periphery of the pipeline For example, the liner may be of circular cross-section and is compacted by forming a re-entrant portion in the periphery of the cross-section to reduce the overall cross-section of the liner.
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