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Title: Analysis of the results of ILI-MFL inspections differentiated for internal and external metal losses
Category: Pigsource Papers
Downloadable: Yes 
Catalog No.: pg3522
Date of Publication: Oct 1 2008 12:00AM
Price: $25.00 US
Authors: J L González Velázquez and R Muñoz Ledo
Abstract: A study was carried out to determine differentiated trends of discrete errors in the detection of defect types on internal and external metal loss. The study was based on the analysis of a high number of results from internal inspections on pipelines using Magnetic Flux Leakage (MFL) and In Line Inspection (ILI) techniques. Starting from this, it is analyzed different methods for evaluating the reliability of the tool and it has been established the guidelines for the statistical adjustment of data. It has been found that, in general, the detection of internal metal loss through ILI - MFL is more accurate and reliable than the external metal loss. The MFL tool for the studied cases had significant deviations in the detection of clusters of PM / ET with depths between 10 and 30% of wall thickness. On the other hand, it is suggested to employ reliability assessment methods for the inspection tool based on comparison of the standard deviation instead of the mean values. This is because it is assumed that during the data acquisition, the systematic errors of the instrumented tools (PIGS)/ILI have been reduced to a minimum and the possible deviations can be properly characterized through a standard distribution. In this paper, we propose to adjust the data with a method based on the mean values and get the reliability of our proposals with its standard deviation. These results will be compared using a Chi square distribution. Also, it is compared the obtained information and that specified in the Appendix E of the API Standard 1163 for verification of individual measurements.
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