The Anchor Leg Load Monitoring System is a monitoring solution for mooring lines. Different technologies can be used within the system depending on its objectives. For breakage or overstress alarms, top angles are measured by inclinometers. For stress cycling monitoring, load cells or vibrating wires (ex-tension/compression measurements) measure parameters that enable tension calculations. By following angles or tension variations, op-erators have access to the actual status of the mooring lines and get valuable information to decide on maintenance or repair before a failure occurs or for making life extension decisions.
The Riser Tension Monitoring System, based on vibrating wire technology, continuously calculates the tension of a rigid riser from extension/compression measurements, allowing long-term remaining life assessment. As for flexible pipes, a better knowledge of operational behavior also helps to improve design coefficients.
The Morphopipe System is dedicated to flexible pipe risers. It is installed at a top location on the riser under the stiffener, where dynamic loads are very stringent due to environmental constraints. An array of sensors, embedded in a dedicated layer, measure the curvatures experienced by the riser. Monitoring curvature cycling loads, correlated with environment data measurements, gives access to the remaining lifetime of the equipment when compared to design calculations. In addition, the follow-up of actual dynamic cycles over the flexible riser lifetime allows re-assessment of the safety coefficients used during design phases.
All the above systems, by monitoring subsea key component conditions, lead to operational risk reduction and operating cost saving. They also help to reduce design and construction uncertainties and offshore manning for inspections, which translates again into cost reductions whilst maintaining high levels of safety.
For further information, please contact Virginie Lenning, Cybernetix Marketing & Technology Coordinator