Abstract
For new build FPSOs or to safely extend the life of ageing assets, operators require technologies that enable them to safely monitor the subsea infrastructure in real-time, to identify problems before they occur. Annual inspections by Remotely Operated Vehicle (ROV), although useful to provide close up inspection, do not provide real-time information in the event of a mooring line failure or problem with the risers.
Through the application of multibeam sonar technology, operators can now have real-time 24/7 information on the presence and position of mooring chains, risers and umbilicals. Unlike other acoustic techniques, multibeam sonar does not require additional sensors mounted to each mooring chain or riser, therefore removing the need for regular maintenance, servicing and power source replacement by ROVs.
The multibeam sonar system provides autonomous alarms in the event of mooring line or bend stiffener failure and the accurate sonar data can be used for further fatigue analysis, assisting in the planned maintenance schedule.
This unique technology was developed for BP and has been successfully deployed on an FPSO in the North Sea, where it has provided round-the-clock integrity monitoring capability. This technology was selected in 2013 for permanent deployment on a new build FPSO entering service in the North Sea with production planned for 2015.
