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Characterization of the Uncertainties in the Inspection Results of Ultrasonic Intelligent Pigs

[+] Author Affiliations
Mamdouh M. Salama

ConocoPhillips Company, Houston, TX

Bruce J. Nestleroth

Battelle, Columbus, OH

Marc A. Maes

Blade Energy Partners, Calgary, AB, Canada

Chris Dash

ConocoPhillips Company, Bartlesville, OK

Paper No. OMAE2013-11168, pp. V003T03A044; 5 pages
  • ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 3: Materials Technology; Ocean Space Utilization
  • Nantes, France, June 9–14, 2013
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5535-5
  • Copyright © 2013 by ASME


In-Line Inspections using magnetic flux leakage (MFL) and the Ultrasonic (UT) intelligent pigs are the most common tools used to assess the integrity of pipelines. But, both MFL and UT inspection results are subject to various sources of uncertainties which must be quantified and accounted for in the integrity assessment of the inspected pipeline. A series of pull-through tests (PTT) of seven MFL tools and two UT tools from five service providers was performed on a 12-inch diameter pipe containing pre-existing internal corrosion defects of various length, width, and depth, and located in a variety of circumferential and longitudinal positions. The results of these tests are used to quantify the detectability statistics and the sizing uncertainties of the different tools for future use in developing calibrated probabilistic models for reliability based inspection, quantitative risk assessment and life extension studies for pipelines. The results of the MFL tools were presented in 2012 OMAE conference and this paper presents the results of the two UT tools.

Copyright © 2013 by ASME
Topics: Inspection



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