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Cracks - Pipeline defects


Figure 1: Crack.

Defect name: Cracks
Record No.: 2748
Type of defect (Internal/Surface): Internal
Defect classification: Other defects
Steel name: Steel
Steel composition in weight %: No data.
Note:  Cracks: MFL tools occasionally detect cracks, even though they are not designed for this purpose. Crack-like imperfections or defects can be found only under limited conditions. Cracks are not common in pipelines, but when they occur, they are due to fatigue, stress corrosion, and weld defects. Selective weld corrosion is often grouped with cracks because it leads to a wedge-shaped groove that behaves somewhat like a crack. Cracks can sometimes be found when they are oriented in a direction that significantly affects the magnetic field around the defect.
Reference: Not shown in this demonstration version.