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51312-01167-Field Methods for Estimating Pipeline Stress Corrosion Crack Growth Rate at Near-Neutral pH

Picture for Field Methods for Estimating Pipeline Stress Corrosion Crack Growth Rate at Near-Neutral pH
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Product Number: 51312-01167-SG
ISBN: 01167 2012 CP
Author: Fengmei Song
Publication Date: 2012
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Crack growth rate (CGR) is a critical parameter in pipeline integrity management for estimating inspection or reassessment intervals. The current industrial practice of estimating CGRs is based on empirical approaches assuming a constant rate or a rate obtained through linear extrapolation. University of Alberta (UOA) recently reported a semi-physical model for predicting CGRs for pipeline near-neutral pH stress corrosion cracking (SCC). This model was developed from extensive laboratory data. More recently Southwest Research Institute (SwRI®) added mechanistic derivation to the UOA model and extended it to a broader range of environmental conditions. Since the central format of both models is essentially the same the UOA model is used in this work as an example for developing a practical method for applying it in field use. A four-step procedure was proposed for field use of the model as an alternative to existing methods. A proper CGR should be chosen by evaluating all the CGRs obtained from different methods and by using best expert judgment.
Crack growth rate (CGR) is a critical parameter in pipeline integrity management for estimating inspection or reassessment intervals. The current industrial practice of estimating CGRs is based on empirical approaches assuming a constant rate or a rate obtained through linear extrapolation. University of Alberta (UOA) recently reported a semi-physical model for predicting CGRs for pipeline near-neutral pH stress corrosion cracking (SCC). This model was developed from extensive laboratory data. More recently Southwest Research Institute (SwRI®) added mechanistic derivation to the UOA model and extended it to a broader range of environmental conditions. Since the central format of both models is essentially the same the UOA model is used in this work as an example for developing a practical method for applying it in field use. A four-step procedure was proposed for field use of the model as an alternative to existing methods. A proper CGR should be chosen by evaluating all the CGRs obtained from different methods and by using best expert judgment.
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