The scope of this paper is to present the results from full scale testing of a flexible riser equipped with embedded sensors for distributed temperature sensing. Testing includes monitoring of accessories mounted on the riser, monitoring of hot spots such as trenched sections of the riser, and finally detection of breaches of the outer sheath. Furthermore, the applications of such a condition monitoring system within Riser Integrity Management (RIM) and production optimization will be discussed. For example, the temperature may be measured along a riser (or flowline) for evaluating the annulus environment and as a supplement to the flow assurance assessment, e.g. to avoid hydrate formation. MotivationWith the increasing use of flexible pipe technology -driven by the move of new offshore fields to deeper, more marginal and more challenging conditions -the need for systematic management of the flexible pipes is becoming more apparent. In particular, the full implementation of Riser Integrity Management (RIM) plays a vital role to ensure an efficient and safe operation. Riser condition monitoring and inspection form an important part of integrity management together with processing and analysis of the monitored data. In that respect, the recently developed technology within optical fiber monitoring offers unique possibilities for quantifying the integrity of the flexible risers during their service life. The advantage of an embedded monitoring system is the ability to continuously survey the riser condition, thus enabling operators to detect potential damages in due time. The embedded system will allow monitoring in critical areas (e.g. under a bend stiffener or inside an I-tube) where access is limited for externally mounted monitoring systems.
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