Meeting the challenge of skewed and tilted cracks

Although the industry has seen dramatic improvements in ILI technology and capability since first introduced, it has lacked the ability to accurately measure tilted cracks, e.g. hook cracks or cracks following the bevel of a DSAW. In general, detecting these types of cracks with current technology is possible, but accurately sizing them is not. Within the last year, NDT Global has overcome these remaining challenges in liquid crack detection technologies.

To address tilted and hooked 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 always combines a clockwise and a counter-clockwise sensor as a pair. This allows recording a third type of signal, in addition to the conventional pulse echo and Enhanced Sizing information.

The development of ultrasonic crack detection technology and capability has been fast-paced and substantial. Along the way, gaps and limitations have been addressed and overcome with high-resolution robots, new analysis methodologies, and today, a special inspection solution:

Evo Eclipse. A combination of different datasets, characteristics, and sizing methodologies allow a highly accurate inspection service, with greatly reduced tolerances. Sub-millimeter accuracy for the entire range of flaws, including hook cracks, is now possible

Pipeline operators can now get a far more accurate understanding of their pipeline condition, without assuming the costs and risks of hydrostatic test inspection

Our Ultrasonic Tools

Eclipse UCx

Eclipse UCx delivers all the benefits of UCx Enhanced Sizing and provides a unique sensor configuration which allows Eclipse UCx to identify and accurately size tilted and skewed cracks, e.g. hook cracks or cracks at the bevel of typical DSAW seams. Eclipse provides ILI critical detection which replaces hydrostatic testing and can be combined with any crack, metal loss or geometry inspection.

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Ultrasonic Crack Detection

The Evo fleet improves speed capabilities and resolution for crack inspections. A maximum inspection speed of 4 m/s and an axial resolution of 1.5 mm (0.06 in) has become standard. Robots can detect and size features with minimum dimension of 20 mm (0.78 in) by 1 mm (0.04 in) in base material at a POD greater than 90%.