Pipe-joining method and system for producing underwater pipelines and underwater-pipeline-laying vessel comprising such a system

摘要

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.