Hydrogen Induced Cracking (HIC) and Sulfide Stress Cracking (SSC) are major issues of line pipes exposed to sour environment. Severity of sour environment determined in accordance with EFC 16 and NACE MR0175 / ISO15156 for low-alloy steels has been proposed based on experimental SSC results. However, SSC susceptibility does not necessarily correspond to HIC susceptibility. The susceptibility of HIC and SSC, which are types of hydrogen embrittlement, would be accurately predicted if absorbed hydrogen content under every environment and critical hydrogen content are fully obtained. In this study, hydrogen permeability domains as a function of pH and H2S partial pressure were determined. In addition, the susceptibilities to these hydrogen-assisted environmental cracking modes under various combinations of pH and H2S partial pressure were also investigated. The severity of the sour environment was proposed based on the hydrogen permeability and the susceptibility for hydrogen assisted environmental cracking.

Subject
Environmental cracking, Materials, Hydrogen permeation, Hydrogen concentration, Permeability, Sour environments, Partial pressures, Sodium chloride solution, Solutions, Steel, Hydrophobic interaction chromatography, Sulfide stress cracking, Hydrogen
Keywords:
Sour environment, Hydrogen, HIC, SSC, Linepipe
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2021
Association for Materials Protection and Performance (AMPP)
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