The number of flexible pipes in operation is increasing due to new field developments and the desire to extend the lifetime of existing fields. There have been many challenges with respect to long term operation of such pipes, in many cases with the need to replace or repair before the end of the initial design life. The number of identified failure mechanisms and observed failure events is also increasing.
The objective of the present paper is to describe the steps required in order to be able to extend the lifetime of a flexible riser for the case of corrosive annulus environments. A specific riser configuration is considered, and the particular case of outer sheath damage is applied for the purpose of illustration.
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