Heavy wall natural gas lines inspection by inline inspection tools
Proceedings Publication Date
Karem Akcha
karem akcha, Alexandre BILLOT
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Gas pipelines are primarily inspected using MFL (Magnetic Flux Leakage) technology due to its 'dry inspection capability.' However, MFL technology has thickness limitations. So, how do we inspect heavy-wall gas pipelines? The answer lies in Ultrasonic technology (UT).

The first challenge is the need for a liquid, like water, for UT inspection. The second challenge arises from the large 30'' x 2500m line, requiring a significant water supply. Third, the mountainous installation location (parabolic D+300m/D-300m) presents challenges. Fourth, obtaining water in a dry, natural setting is tough.

Intero's expertise in complex projects is invaluable.

A comprehensive service package using Nitrogen Services and Inspection Services at Intero has successfully tackled these hurdles while ensuring high performance, safety, and data quality.

To perform this challenging inspection, we deployed 26 temporary tanks containing
70m3, a powerful pump (400m3/h at 36bar), and 600m of hoses to a fire reserve basin. We pushed the inspection tool uphill using water from the launcher to the receiver, then returned it with Intero's nitrogen pump, emptying the line.

Managing high back-pressure, controlling flow, and ensuring data quality were critical and successfully managed by Intero. After a three-week shutdown, Intero dried the pipeline to prepare it for natural gas.

Our commitment to evolving solutions and flexibility remains unwavering.

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