The below methods are usually used for pipe and pressure vessel inspection during construction for material defects especially on welds.
Some of these techniques can also be used for maintenance inspection of an operational plant such as UT for thickness measurement, RT for flaw imaging, thermography for leak detection behind insulation and Eddy current for heat exchange tube inspections.
-Visual inspection
-PT
-MT
-UT
-RT
-Eddy current
-Thermography
Watch this youtube video from TWI for a clear picture of the physical equipment used and their operating principles.
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