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Challenging Pipelines
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Putting theory into practice
Hydrostatic Testing for Complex Cracking
The Challenge
To identify an alternative to hydrostatic testing, our client wanted to explore the feasibility of an ultrasonic solution, to provide a proven and alternative method for inspecting their critical lines. Despite the ability to detect hook cracks, they are typically undersized with conventional technology, leading to an underestimation of severity which may later cause in service failures.
The Solution
To address tilted (hooked) and skewed cracks, a modified sensor arrangement was introduced to the fleet of robots. Instead of arranging clockwise and counter-clockwise sensors independently from each other, the new arrangement combines a clockwise and a counter-clockwise sensor as a pair. This allows the recording of a third type of signal, in addition to the conventional pulse echo and Enhanced Sizing
information.
The Results
Detection of critical defects by avoiding the use of Hydrostatic Testing, ensuring 99% probability of detection of severe flaws without the risk of causing plastic deformation of the pipeline
The operator used a third party to independently verify inspection results
Ultrasonic critical feature detection robot, Eclipse UCx, has taken the ILI industry to the next level, not only with the advanced hook crack detection but with a full spectrum of additional features that are changing the way operators approach their inspection decisions.
