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Displaying records 486 through 486 of 2180
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Title: Crack detection in pipelines: survey experience obtained with the 'UltraScan CD' tool
Category: Pigsource Papers
Downloadable: Yes 
Catalog No.: pg3255e
Date of Publication: 1996
Price: $25.00 US
Authors: H H Willems and Dr Michael Beller
Abstract: The rate of pipeline failures caused by cracking is increasing world-wide, and several severe accidents have already occurred. In most cases, the ruptures are attributed to stress-corrosion cracks (SCC), but fatigue cracks may also be expected under certain conditions. Hydrostatic pressure tests are usually applied by the operating companies to verify the crack state of their pipelines. Such tests, however, do not yield detailed information, and may even worsen the damage state. Pipetronix now provides a powerful alternative: with the new ultrasonic crack-detection tool (UltraScan CD), for the first time a sensitive and reliable in-line detection of crack-like defects becomes a reality. The tool ensures a highly-sensitive detection of SCC, fatigue cracks, or other longitudinal crack-like defects with sizes as small as 30mm in length and 1mm in depth.

Since its commercial availability in October, 1994, it has successfully inspected nearly 1000km of operating pipelines (gas pipelines, as well as oil pipelines). The positive experiences gained so far have led to the approval of the tool by German T V as a substitute for in-service hydrotests. In the paper, we present in particular some results from a SCC inspection of a gas transmission pipeline.

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