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Heavy wall – small diameter ILI

We appreciate to share our knowledge and our experience with customers and business partners. Every pipeline inspection project presents new challenges and requires an adapted approach as well as individual technical solutions.

We have compiled this treasure trove of first-hand practical experience for you as a case study. There we describe our concept, our performance and the result of our ILI projects.

Pipeline Description: Offshore flowlines 4“, wall thickness ½“, designed as a hair pin loop starting from the Gannet A platform (Central North Sea), passing by two subsea production templates and back to Gannet A. The total length is 11.7 km. There are flexible riser sections at the foot of the platform and bend radius of 5D within the risers. Why is it challenging? ½” wall thickness cannot be sufficiently magnetised in a 4” pipeline. Therefore an MFL inspection is not feasible. Ultrasonic inspection tools, that could handle the wall thickness, were not available for 4”. Further, the permanent pig traps, having a length of only 1100mm, cannot be extended. Target of the inspection: Perform a high resolution inspection for internal local corrosion. Due to the project circumstances the inspection was to be performed under urgency.

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