Circumferential Crack Inspection

Detecting and sizing circumferential crack-like irregularities

Circumferential Crack-Like Irregularities

In comparison to axial cracks, circumferential cracking does not yet show a significant role in pipeline integrity. Nevertheless, pipeline operators observe these defects, often in combination with circumferential welds and/or local stress/strain accumulation. Such features are often caused by soil movement, which may occur more readily in mountainous areas. Stress accumulation in combination with susceptible pipe steel, coating, and environmental conditions can cause circumferential cracking. These type of defects can be addressed with ILI robots utilizing ultrasonic shear wave technology.

Circumferential crack detection inspections are becoming more widely viewed as a necessity for integrity management programs. Ultrasonic ILI robots can play an important role in the integrity management of circumferential cracks

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Evo Series UCc

Circumferential cracking defects can be addressed with ILI robots utilizing ultrasonic shear wave technology.

To accurately identify Circumferential cracking, the diffracted shear wave signal travels in the pipe wall by an angle of 45° and is reflected either by an external or internal flaw. Based on the individual pattern of the reflected signal algorithms, experienced data analysts can read and translate the information into flaw properties, e.g. length, width, type and depth.

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Ultrasonic Crack Detection

Evo Series 1.0 UC fleet improves speed capabilities and resolution for crack inspections. A maximum inspection speed of 4 m/s and an axial resolution of 0.75 mm (0.03 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%.