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Corrosion Monitoring & Inspection Glossary - U

  • Ultrasonic thickness (UT): Corrosion monitoring technique which provides a means of measuring the thickness of the metal through ultrasound. Compression waves are used for internal pitting and mid-wall effects. Shear waves (at an angle to the surface) are used for welded joints and perpendicular cracks.

  • Utility Pig: A pig that performs relatively simple mechanical functions, such as cleaning the pipeline.


Corrosion Inspection and Monitoring