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51316-7139-Metallurgical Methods used to Assess the Significance of Pipeline Stress Cracking

Methods used to destructively determine the actual crack depths in the Pipeline Research Council International project as well as the statistical comparison of those values to the NDE measurements. We also briefly introduce advanced fracture mechanics analysis techniques that can be used to assess the safety significance of crack-like pipeline anomalies.

Product Number: 51316-7139-SG
ISBN: 7139 2016 CP
Author: Steve Biagiotti
Publication Date: 2016
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Stress corrosion cracking (SCC) and Hydrogen Induced Cracking (HIC) continue to be significant challenges to the pipeline industry. The initial challenge is identifying “where” along a pipeline the damage may exist through inline inspection (ILI) or direct assessment (DA) methods. However, additional challenges must be overcome to realistically assess the significance of the damage to safe pipeline operation. These include characterizing the true extent of the SCC or HIC, estimating future crack behavior and predicting failure pressures.
This paper presents the methods used to destructively determine the actual crack depths in the PRCI(1) project as well as the statistical comparison of those values to the NDE measurements. We also briefly introduce advanced fracture mechanics analysis techniques that can be used to assess the safety significance of crack-like pipeline anomalies.
Key words: downloadable, SCC, metallography, crack measurement, NDE, T-test, fracture mechanics, Phased Array UT, TOFD, Full Matrix Capture

Stress corrosion cracking (SCC) and Hydrogen Induced Cracking (HIC) continue to be significant challenges to the pipeline industry. The initial challenge is identifying “where” along a pipeline the damage may exist through inline inspection (ILI) or direct assessment (DA) methods. However, additional challenges must be overcome to realistically assess the significance of the damage to safe pipeline operation. These include characterizing the true extent of the SCC or HIC, estimating future crack behavior and predicting failure pressures.
This paper presents the methods used to destructively determine the actual crack depths in the PRCI(1) project as well as the statistical comparison of those values to the NDE measurements. We also briefly introduce advanced fracture mechanics analysis techniques that can be used to assess the safety significance of crack-like pipeline anomalies.
Key words: downloadable, SCC, metallography, crack measurement, NDE, T-test, fracture mechanics, Phased Array UT, TOFD, Full Matrix Capture

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