Norfolk Marine Ltd Completes First Installation of their Tyre Filled Net (TFN) Scour Remediation System

Norfolk Marine Ltd have completed installation of their TFN Scour Remediation System to E.ON’s Scroby Sands Offshore Wind Farm. The system has been installed to 5 monopile foundations on the site to provide protection against further scouring of the seabed at the foundation bases. After extensive testing and development including scale modelling at HR Wallingford’s new Fast Flow Facility* the TFN system was installed in late 2015.

The TFN System captures and maintains natural seabed sediments, reinstating the seabed with naturally occurring materials. This not only prevents further scouring around base of subsea structures but offers protection to cables at the critical interface between trench and J tube. For new build sites, the system can be installed after monopile and cable installation has been completed and so reduces upfront investment in Scour Protection systems.

HR Wallingford concluded “Our analysis of the short term impacts showed that the nets were effective in preventing and reducing scour around monopile foundations”.

Following the endorsement of the TFN System, E.ON Operations & Maintenance Manager, Steve Johnson, commented, “The TFN System developed by Norfolk Marine Ltd gives a cost effective alternative to rock dumping or sand/stone filled geotextile bags. The TFNs can be easily removed for cable maintenance, and can be reinstalled, without the need for expensive dredging”.

The TFN System is the first in a range of Offshore Scour Protection products currently under development by Norfolk Marine Ltd for protection of Structures, Pipelines and Cables installed in areas where the seabed is subject to scour.