Oceaneering Asset Integrity

Subsea conductor stabilisation

The Oceaneering CSS Subsea solution focuses on HSE and eliminates the need for any divers. The solution offers a considerable time / cost saving operation compared to the traditional diver deployed systems.

The ROV operated subsea solution flies the prefabricated section to the installation site. The sections are zero buoyant in water prior to installation.

After the section is installed the buoyancy aid is removed and the section becomes negatively buoyant.

Benefits of the Oceaneering CSS Subsea solution include:

• No diver operation required for installation
• Operation performed 100% by ROV
• No steel to steel contact between conductor and guide
• Stabilisers are fabricated to cater for misalignment
• Stabiliser sections prefabricated onshore before start of operation
• No need for post-installation maintenance
• The material is environmentally friendly
• The material is not affected by seawater environment

Topside conductor stabilisation for offshore installations

Oceaneering’s CSS Subsea minimises wave-induced damages to an offshore installation by improving traditional techniques to obtain conductor / guide stability. Waves generate vibrations which are damaging to the conductors, risers, caissons and the installation in general. Conductors’ hammering against the guides, resulting in fatigue and fracturing, is one known problem with lateral wave movement. Repairing these damages can be costly, challenging and even dangerous.

Oceaneering has vast experience and excellent results with use of this technique on conductors, caissons and risers above sea level. The Oceaneering CSS Topside was first used on a Statoil installation in 1999. To date, no preventative maintenance has been required on this cast.

Conductor stabilisation solution

A new elastic stress-absorbent compound called Elastogran™ is cast into the entire length and diameter of the conductor guide. The Oceaneering CSS entirely replaces the traditional need for centering and chocking solutions and provides for a new, better and measurable solution.

Oceaneering CSS benefits:

• Faster and better solution than traditional methods
• Uses the entire length and width of guide
• Three-step easy implementation
• Reduces wave-induced impact and damage
• Increased guide stability
• Extends life of conductors and caissons
• Subsea application
• No maintenance and long-lasting solution