公开(公告)号：US09822905B2

公开(公告)日：2017-11-21

申请号：US14564239

申请日：2014-12-09

Applicant: ITP SA

Inventor： Christian Bonigen ,  Christian Geertsen

IPC: F16L1/12 ,  F16L1/225 ,  F16L1/235 ,  F16L1/23 ,  F16L1/26 ,  F16L1/18 ,  F16L59/065 ,  F16L1/19 ,  B63B35/03 ,  F16L1/16 ,  F16L59/14

CPC classification number: F16L1/18 ,  B63B35/03 ,  F16L1/165 ,  F16L1/19 ,  F16L1/235 ,  F16L59/065 ,  F16L59/143

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.