PR186-233809-R01 Hydrogen Cracking Integrity Management Evaluation

This report describes what is understood by the pipeline industry concerning the hydrogen cracking mechanisms of hydrogen blistering and hydrogen embrittlement. Based upon the industry’s understanding and case studies reviewed, in-line inspection (ILI) strategies for two hydrogen-related cracking threat scenarios were developed. The ILI strategies rely upon a susceptibility determination in accordance with the guidance offered in previous PRCI work. The susceptibility determination methodology relied upon in this work was benchmarked using pipeline segments for which the presence of a significant threat of hydrogen-related cracking in pipe body hard spots was known.