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Title: Verification studies of guided wave ultrasonic inspections
Category: Pigsource Papers
Downloadable: Yes 
Project No.:
Research Agency:
Catalog No.: pg3427
Date of Publication: Feb 1 2005 12:00AM
Price: $25.00 US
Authors: Scott Lebsack
Abstract: DOT pipeline integrity regulations require operators to assess pipeline sections that previously could not be inspected by conventional in-line-inspection processes, i.e., smart pigs. The rules for gas pipelines allow the use of Direct Assessment to evaluate the integrity of these lines. Over the last five years Guided Wave UT has been used to inspect interstate pipelines regulated by DOT/OPS. The method is recognized as one of the important technologies in the Direct Assessment process.

This paper briefly reviews the guided wave process and compares some of the field data obtained with the actual as-found pipe conditions. The paper generally looks at the research underway in field applications of long-range ultrasonic technology that is contributing to the development of new and better equipment. Next generation equipment sets have been developed and the capabilities of these units will permit more flexibility in data acquisition, greater sensitivity, better defect discrimination and improvement in the inspection range.

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