Read the whole story of…
…Heavy wall MFL – Stretch the boundaries
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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: Two 10″ heavy wall offshore pipelines running parallel from platform to platform required a metal loss inspection. The length is 1.9 miles (3 km). There are heavy wall riser sections with 0.719″ (18.2mm) wall thickness at the foot of the platforms. The pipelines are located offshore California, USA. Why is it challenging? With common MFL tool designs, the wall thickness of 0.719″ (18.2mm) cannot be sufficiently magnetised in a 10″ pipeline. Therefore, an MFL inspection seemed not feasible. In addition, a previous 3rd party MFL inspection wasn’t successful because of this. Ultrasonic inspection tools failed to get good data because of debris issues. The high cleanliness requirements for UT technology could not be met. Target of the inspection: Perform a high-resolution metal loss inspection for internal and external corrosion. Due to the project circumstances the inspection was to be performed under urgency.
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