June 2019, Vol. 246, No. 6

Features

Measuring Crack Defects with Sub-Millimeter Accuracy

Ultrasonic crack technology, using piezoelectric transducers, is a proven and widely used solution for crack and crack-like defect detection in liquids pipelines. Over the past 20 years, only minor developments and improvements in this area were offered to pipeline operators.  The most significant enhancement was a move from bucket sizing to absolute depth sizing. After two decades of incremental improvements, technology-related limitations still prevent accurate sizing of defects. Recent technical developments have successfully overcome several of these limitations. Higher-resolution tools, specialized sensors and measurement configurations address major flaw-measurement challenges: depth

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