Webinar: Verification and Validation of the Plausible Profiles (Psqr) Method for the Assessment of Corroded Pipelines
Verification and Validation of the Plausible Profiles (Psqr) Method for the Assessment of Corroded Pipelines
Thursday, September 21, 2023 11:00 AM – 12:00 PM EDT
Presenters: Daniel Spring, Ph.D.
The Plausible Profiles (Psqr) method has been proposed as a means for reducing conservativism in a Level 2 Fitness-For-Service (FFS) evaluation of corrosion damage; and is being considered for adoption by both the ASME B31.G and API 579-1/ASME FFS-1 code committees.
Current Level 2 evaluation procedures in ASME B31.G use an effective area method computed on the “river-bottom” profile. The river-bottom profile consists of the profile that connects each of the lowest points on all circumferential cross-sectional planes of a corroded region, with no consideration given to the physical proximity of the lowest points on adjacent planes. Alternatively, the Psqr method generates several plausible profiles, with constraints applied to the physical distance between points on adjacent circumferential planes. The burst pressure (Pburst) is calculated for each profile, using the effective area method. Finally, the Psqr method selects the 5th-percentile value of the resulting Pburst distribution as representative of that for the corroded region.
The Psqr method is purely statistical and is guaranteed to predict a burst pressure that is greater than or equal to the existing Level 2 approaches in ASME B31.G. This has great appeal, as it yields fewer follow-up inspections and remediation activities, saving operators money. However, no independent review has been presented that compares the Psqr method to rigorous Level 3 Finite Element Analysis or independently gathered validation data. This presentation will discuss the findings of a detailed review of the Psqr method and reveal insights into its applicability and limitations.
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