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