Pipe-joining method and system for producing underwater pipelines and underwater-pipeline-laying vessel comprising such a system
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United States of America Patent
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Sep 3, 2013
Issued Date -
N/A
app pub date -
Apr 9, 2008
filing date -
Apr 10, 2007
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of joining pipes to produce an underwater pipeline on a firing line includes supplying the firing line with pipes having previously roughened end portions; welding the end portions of adjacent pipes to form cutbacks, each of which is defined by two end portions, and by an annular weld bead between the two end portions; cleaning, by cryogenic blasting, the outer surface of each cutback; and forming a protective joint coating about each cutback.
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