Atteris was engaged to develop an intervention design concept which would later be detailed for construction. The project remit was to design a stabilisation system which:
- Did not interfere with the pipeline cathodic protection system
- Had the ability to deal with changing shoreline elevations
- Can withstand breaking wave loads
- Allows future visual pipeline inspections
- Has minimal interface with the pipelines
- Considers site access and constructability constraints.
After establishing a regular interface meeting with the client and their installation contractor, Atteris was able to propose an external stabilising structure with adjustable bracing saddles which interface with the pipelines. Crane access to the site was limited and would result in additional site works. Atteris proposed and designed components which would allow for manual handling using aids. Working with the installation contractor, Atteris was able to develop the concept design quickly in preparation for procurement and fabrication. One of the largest and heaviest components was the cross beams. Handling of these was overcome by the installation who floated them in from a small jack up barge located offshore on the high tide.