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In-Line Inspection Performance III: Effect of In-Ditch Errors in Determining ILI Performance

[+] Author Affiliations
Rick McNealy

Applus-RTD, Houston, TX

Roger McCann

Applus RTD, Houston, TX

Michael Van Hook, Amanda Stiff

Williams Gas Pipeline, Salt Lake City, UT

Richard Kania

TransCanada, Calgary, AB, Canada

Paper No. IPC2010-31269, pp. 469-473; 5 pages
  • 2010 8th International Pipeline Conference
  • 2010 8th International Pipeline Conference, Volume 4
  • Calgary, Alberta, Canada, September 27–October 1, 2010
  • Conference Sponsors: International Petroleum Technology Institute and the Pipeline Division
  • ISBN: 978-0-7918-4423-6 | eISBN: 978-0-7918-3885-3
  • Copyright © 2010 by ASME


The performance of in-line inspection tools employed for pipeline integrity assessments has significant impact on the reliability of assessment results and subsequent remediation program. Previous papers by the lead authors established criteria for determining the number of “successful” field validation measurements for establishing whether a tool’s performance should be accepted or rejected and how to assess the tool performance when a claimed performance can be neither rejected nor accepted. This “apparent” validated performance contains both the ILI tool measurement error and the in-ditch measurement error. Determination of the true tool error can have significant impact on the response to ILI feature characterization relating to timing for repairs and justification of re-assessment intervals. Measurement errors, associated with the currently available technologies employed in the field for in-line inspection metal loss validation measurements, are discussed in this paper. The relative effect of variations in validated tool error due to field measurement error on pipeline integrity is discussed within the context of actual in-line assessment case studies.

Copyright © 2010 by ASME
Topics: Inspection , Ditches , Errors



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