Surface laid pipelines can experience free-spans due to various reasons; uneven seabed and local scour. If free-spans are long, the vortex induced vibrations (VIV) can cause the pipeline to undergo fatigue damage and severely reduce the pipeline design life.
Free-spans can be rectified by,
- Pipeline Lowering (PL) Method
- Grout/Sand bag placement
- Rock dump placement
The selected method for rectification depend on the pipeline details, location, water depths and cost details.
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