Process and device for laying a pipe-in-pipe
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United States of America Patent
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Nov 21, 2017
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app pub date -
Dec 9, 2014
filing date -
Dec 10, 2013
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Abstract
The invention concerns a process and a device for laying a subsea pipeline according to the J-lay or S-lay method wherein straight sections are mounted onshore, dried and degassed then closed by plugs. The sections are loaded on a pipe-laying ship, are separated from their plugs before the welding. At the welding of each bulkhead a short pumping is operated to reduce the pressure in the part of the annulus located between the two last bulkheads and then the opening leading to the annulus are sealed.
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