Rotating Buoyancy Modules are used to mitigate buckling in seabed pipelines. Buckling occurs during start-up and shutdown sequences as the thermal fluctuations cause pipelines to expand and contract, leading to problematic buckling along its length.
Traditionally non-rotating cylindrical buoyancy modules have been installed along sections of the pipeline, to reduce the weight and friction in that section and promote controlled bending. However, in certain conditions, the modules have displaced seabed material to build berms (ridges) that have then restricted the lateral movement the modules were installed to promote.
Rotating Buoyancy Modules roll on the seabed reducing lateral friction and berm creation, allowing repeatable and predictable pipeline behaviour by eliminating rogue buckles and reducing axial walking in the pipeline. As a consequence, it allows for project cost reduction, as a lower quantity of buoyancy modules are used to create ‘safe buckling zones’.
Predictable safe buckling zones
Reduce berm creation
Eliminate rogue buckles
Reduce axial walking in the pipeline
Reduced project costs
Seabed pipeline and flowlines