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08142 The Utilization of a Pipeline Integrity Management System for ECDA Management within Gasunie

Picture for 08142 The Utilization of a Pipeline Integrity Management System for ECDA Management within Gasunie
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Product Number: 51300-08142-SG
ISBN: 08142 2008 CP
Author: Menno T. Van Os, Piet Van Mastrigt, and Giorgio G.J. Achterbosch
Publication Date: 2008
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$20.00
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Gasunie has utilized External Corrosion Direct Assessment (ECDA) as proposed by the NACE as a valuable method to assess the corrosion threat to unpiggable pipelines. ln addition, a new probabilistic methodology has been adopted to quantify the results of an ECDA and to account for any uncertainties experienced throughout the process. This approach, based on Structural Reliability Analysis (SRA) and Bayesian statistics, uses the data gathered in the pre-assessment to calculate a failure frequency for each ECDA region defined. In the indirect inspections step, the method allows automatic updating of the expected number of both coating and corrosion defects based on the results of two aboveground surveys (one for the detection of each). In the direct examinations step, the method uses the results from excavations to automatically update the performance characteristics of the survey techniques (e.g. probabililty of detection and probability of false indication), the time of initiation of corrosion defects, the defect depth, corrosion growth rate and several other relevant parameters. The failure frequency is updated accordingly.
Gasunie has utilized External Corrosion Direct Assessment (ECDA) as proposed by the NACE as a valuable method to assess the corrosion threat to unpiggable pipelines. ln addition, a new probabilistic methodology has been adopted to quantify the results of an ECDA and to account for any uncertainties experienced throughout the process. This approach, based on Structural Reliability Analysis (SRA) and Bayesian statistics, uses the data gathered in the pre-assessment to calculate a failure frequency for each ECDA region defined. In the indirect inspections step, the method allows automatic updating of the expected number of both coating and corrosion defects based on the results of two aboveground surveys (one for the detection of each). In the direct examinations step, the method uses the results from excavations to automatically update the performance characteristics of the survey techniques (e.g. probabililty of detection and probability of false indication), the time of initiation of corrosion defects, the defect depth, corrosion growth rate and several other relevant parameters. The failure frequency is updated accordingly.
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