Read the whole story of…
…BIDI riser inspection
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: High pressure gas pipeline, 6” WT 12.7mm, operating pressure 131 bar. Length approx. 10km. The pipeline connects a 20” subsea natural gas transmission line with the Thistle platform in the northern North Sea. It consists of (1) the subsea tee piece with valve station, (2) the sea line and (3) the riser. Why is it challenging? There are no possibilities to install a pig trap at the subsea end of the line. Further, for operational reasons it is not possible to de-pressurise the line. In view to UT-inspections, to flood the riser with water was no option. Target of the inspection: To determine external corrosion on the riser. The riser is located inside a casing that had an unknown history.
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