Subsea vehicle assisted pipeline dewatering method
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United States of America Patent
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May 4, 2010
Grant Date -
Jan 4, 2007
app pub date -
Jun 15, 2005
filing date -
Mar 13, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention is directed to a pig receiver used in a dewatering method for subsea pipelines. In the dewatering method a pig is placed in one end of the pipeline filled with water and a compressed gas is introduced behind the pig; in addition the water and pig are drawn by a subsea pump operated by a submersible vehicle (SV) operating near the sea floor to a pig receiver of the present invention. A feature of the pig receiver is a gas sensor that shuts the pump off when gas enters the receiver to prevent a gas (vapor) lock of the pump.
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