The Study and Application of the Gravity Type Atmosphere Pressure Dry Cabin Technology for the Sub-sea Pipeline Repairing

摘要

There are some methods to repair damaged and distorted sub-seapipelines, including gripper connector reparation, pipeline lifting andflange welding reparation and gravity atmosphere pressure dry cabin（ GAPDC ） reparation etc. Different methods can be applied indifferent scopes: gripper connector can be used in both shallow anddeep sea, pipeline lifting and flange welding reparation can only beused in shallow sea which is less than 30 meters, and GAPDC can beused in special occasion in shallow sea that can not lift the pipeline orneed welding under gravity atmosphere pressure.The writer of this paper, as the project manager, presided the Dongfang1-1 landing pipeline repair project. Taking all the circumstances intoconsideration, such as the nearshore pipeline buried 9 meters under therubble mound, the pipeline tip 24 meters to the rubble mound, can notlift the pipe to weld the flange and booking a ball flange need a longterm, a new method-GAPDC, was developed and applied in theDongfang 1-1 landing pipeline repair project successfully. This paperspecifically introduced the pipieline repair scheme design, GAPDCstructure design and operation procedures, including the prospecting ofthe damaged pipelines, the manufacture of the GAPDC, the clearanceand cutting of the damaged pipeline, the fishing operation of pipeline,the emplacement of the GAPDC, flange welding in the dry cabin etc.At the same time, it also introduced new technology innovation andapplication in this project, and provided some experience to the similarproject for the future.