Offshore flexible pipelines are designed to operate without intervention throughout the life of field, which can be 20 to 30 years long. The monitoring of these lines is more and more often considered and implemented with two main objectives: to confirm that the risers and flowlines operate within safe working limits and enable the assessment of the integrity and lifetime of these lines. The first objective can be achieved by continuous collection of the operational data, such as for example internal pressure, fluid temperature, riser top tension and vessel motions, to confirm that the pipelines continue to be operated within the design parameters. The second objective can be achieved through direct condition monitoring of the flexible pipe (for example coupons samples, temperature within the pipe structure, curvature and bending stresses). All of these techniques can contribute towards regular assessment of pipe integrity and lifetime. Flexi France is developing several monitoring and inspection technologies, some of which are already operational or ready to use. This paper will focus primarily on corrosion monitoring of flexible risers steel reinforcement layers through measurement of the annular space fluid composition and physical parameters such as temperature distribution, end-termination sealing integrity and dynamic risers curvature distribution. The state of the art monitoring technologies will be presented in this paper, and it will be explained how they can allow the field operator to optimize the inspection program, reduce the risk of potential damage in operation or enable reuse of the flexible lines at the end of field life.

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