Method for laying a pipeline on the seabed and a pipeline installation device

摘要

The present invention regards a method for laying pipelines on the seabed comprising the steps of attaching an end (2) of the pipeline (1) to a structure (10, 20), lowering the structure with the pipeline to the seabed, allowing the pipeline end to pivot relative the structure, measuring the inclination of the pipeline end relative to the seabed, modifying a pipe spool such that one end is given the same inclination of the end as the pipeline and that at least one part of the pipe spool will be resting on the seabed after connection, connecting the pipe spool to the pipeline. The invention also regards a pipeline installation device where at least a one side of a top structure is allowed to move relative a foundation structure.

主权项

1. A method for laying pipelines on the seabed comprising the steps of:
attaching an end of the pipeline to a structure; lowering the structure with the pipeline attached to the seabed; after the structure has landed on the seabed, allowing the end of the pipeline to pivot relative to the structure; measuring an inclination of the end of the pipeline relative to a horizontal plane; modifying a pipe spool such that an end of the pipe spool is given the same inclination as the end of the pipeline; and connecting the end of the pipe spool to the end of the pipeline; whereby the bending moments in the connection between the pipeline and the pipe spool are reduced.