DIRECT ASSESSMENT-1: Software module hones system-wide practices

Gasunie has utilized external corrosion direct assessment (ECDA) as proposed by the National Association of Corrosion Engineers (NACE) as a valuable method of assessing the corrosion threat in unpiggable pipelines.Structural-reliability analysis (SRA) combined with Bayesian statistics make it possible to quantify the results of an ECDA process. This combined method allows automatic adjustment of the expected number of both coating and corrosion defects based on the results of two aboveground surveys (one for the detection of each).The method makes it possible to use the results of excavations to adjust the following variables:The probabilities of detection and of false indication of each ...

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