United States Department of Transportation
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In-Line Inspection Technologies for Mechanical Damage and SCC in Pipelines: Final Report on Tasks 1 and 2
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1998-12-01
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[PDF-2.38 MB]
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Edition:Final Report
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Abstract:This report is a summary of work conducted under a research and development contract entitled "In-Line Inspection Technologies for Mechanical Damage and SCC (Stress-Corrosion Cracking) in Pipelines." This project evaluated and developed in-line inspection technologies for detecting mechanical damage and cracking in natural gas transmission and hazardous liquid pipelines. The work consists of three major tasks. Task 1 covers inspection methods for mechanical damage. Task 2 covers methods of detecting stress-corrosion cracks. Task 3 covers verification testing. This report is a summary of the work completed in the first two tasks. Task 1 examined magnetic flux leakage (MFL) for detecting mechanical damage. It evaluated existing signal generation and analysis methods to establish a baseline from which today's tools can be evaluated and tomorrow's advances measured, and it developed improvements to signal analysis methods and verified them through pull rig testing. Finally, it built an experience base and defect sets to generalize the results from individual tools and analysis methods to the full range of practical applications. Task 2 evaluated two inspection technologies for detecting cracks. Three subtasks were conducted to evaluate velocity-induced remote-field techniques, remote-field eddy-current techniques, and external techniques for sizing stress corrosion cracks.
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