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Scour Protection

Where pipelines, cable and subsea structures are installed in fast running waters, and cohesionless soils make up the seabed, excessive scour can create serious structural or operational problems.

Seabed scour and has the potential to form sand waves, seabed erosion and deposition of material dependent on the near seabed changes in water particle velocity.

In the context of offshore structures scour can be caused when an installation interferes with the natural near seabed water particle velocities.  Such installations include:

  • piles
  • templates
  • jackets
  • pipelines
  • cables

Pipelines can cause water to accelerate in front of the pipeline thus eroding the soil in front and in extreme cases creates a breakthrough under the pipeline to cause free-spans with the obvious undesirable consequences. Mono-piles cause the water to accelerate around them, creating a scour hole around the base.

Where our Scour Prediction Analysis indicates the need, we can supply a range of scour protection, scour remediation and free span correction products.

Our research

Pipeshield has previously, in conjunction with HR Wallingford and Fugro Ltd, carried out in depth Scour Studies for Shell to establish scour potential and provide preventative measures on the Carrack and Cutter fields. Computer CFD models were created and tested against measured data to establish site specific scour benchmarks in order to predict and thus prevent scouring in the two southern North Sea locations using fronded concrete mattresses.

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