Seabed stability & cable crossing

What is seabed stability?
- Seabed stability is the control of movement of subsea cables, umbilicals and flowlines once they are installed on the seabed. Environmental loads, thermal effects, seabed conditions and operational factors can cause axial or lateral movement, potentially increasing stresses and affecting service life.
What solutions are available for seabed stability?
- Solutions include ballast systems for increasing submerged weight, mats for protection and stabilisation, and motion stabilisers designed to resist axial and lateral movement. The appropriate solution depends on the application, line characteristics, seabed conditions and required stability.
What are cable crossing solutions used for?
- Cable crossing solutions provide separation and protection where a new subsea cable or pipeline crosses an existing cable or pipeline. Systems such as Polyspace can create the required clearance while helping protect the host line during installation and operation.
How can additional weight improve seabed stability?
- Increasing submerged weight can increase the resistance of a cable, umbilical or flowline to movement. Ballast solutions can therefore be designed to achieve the required stability while taking account of the line's dynamic behaviour and project requirements.
Can seabed stability solutions be customised?
- Yes. Solutions can be configured according to project-specific requirements, including weight, dimensions, line size, seabed conditions and installation methodology. For example, Polymat and ballast systems can be tailored to provide the required weight and protection.
Are these solutions suitable for subsea cable crossings?
- Yes. The product range includes solutions specifically suited to subsea cable crossings. Polymat can provide protection and stabilisation, while Polyspace provides clearance and crossover protection between new and existing subsea cables or pipelines.
How are the solutions installed?
- Installation depends on the selected product. Options include ROV installation, installation during cable or pipe lay operations, and systems supplied in sections or halves for efficient offshore deployment. Installation requirements are considered as part of the solution design.
How do I select the right seabed stability or cable crossing solution?
- Selection depends on factors including the cable or pipeline dimensions, required submerged weight or clearance, seabed soil conditions, environmental loads and installation method. Our engineering team can assess the application and recommend a suitable solution.

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Extended field-life with reliable seabed stability and cable crossing solutions

Reliable solutions for controlling movement, adding submerged weight and protecting subsea infrastructure. Our range supports cables, umbilicals and flowlines with engineered solutions for seabed stability, cable crossings, clearance, impact protection and long-term subsea performance.

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