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Picture for Impact of Corrosion Growth on Effective Flaw Dimensions

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Impact of Corrosion Growth on Effective Flaw Dimensions

Product Number: 51324-21001-SG

Author: Thomas A. Bubenik; Steven J. Polasik; Benjamin Hanna

Publication Date: 2024

$40.00

This paper summarizes the results of a sensitivity study conducted on corrosion clusters on a steel pipeline, specifically (1) the change in cluster effective length as the individual anomalies that make up the cluster grow and (2) the effect of changes in effective length on the remaining life calculated using deterministic methods. Two growth scenarios are considered: clusters that grow at the same rate along the cluster versus clusters that grow at a depth-based corrosion growth rate (e.g., deeper areas grow faster than shallower areas). The study shows that, in both scenarios, the effective lengths of long clusters shrink with growth. Examples demonstrate the impact of the results for a semi-elliptically shaped anomaly. The change in effective length and the corresponding change in critical or maximum depth led to an increase in calculated remaining life of 20% to 40% for the cases studied.

Picture for Investigating the Application of the Effective Area Approach to Estimating Fatigue Life

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Investigating the Application of the Effective Area Approach to Estimating Fatigue Life

Product Number: 51324-21053-SG

Author: Zach Booth; Ben Hanna; Steven J Polasik

Publication Date: 2024

$40.00

Fitness-for-service assessments of corrosion flaws in line pipe often use an Effective Area Method approach (e.g., RSTRENG) to estimate criticality. This method evaluates all contiguous combinations of flaw dimensions that can be defined via a detailed profile. The lowest burst pressure of those combinations is considered the estimated burst pressure of the flaw. This paper investigates the use of an effective area approach to estimate the remaining fatigue life of crack-like flaws described by a detailed profile. Using flaws reported from in-line inspection, the burst pressure and fatigue life of all combinations of flaw dimensions were estimated using the CorLAS™ fracture mechanics model. For some profiles, the effective area corresponding to the lowest burst pressure is not the same as the effective area corresponding to the lowest fatigue life. Therefore, additional analyses of flaws with detailed profiles may be warranted when developing remediation plans considering both fatigue life and burst pressure.

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