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Sour Environmental Severity Based On Hydrogen Permeability And HIC/SSC Susceptibilities

Picture for Sour Environmental Severity Based On Hydrogen Permeability And HIC/SSC Susceptibilities
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Product Number: 51321-16543-SG
Author: Taishi Fujishiro/ Takuya Hara/ Daisuke Mizuno/ Nobuyuki Ishikawa/ Kyono Yasuda/ Eiji Tada/ Mitsuo Kimura
Publication Date: 2021
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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.

Key words: Sour environment, Hydrogen, HIC, SSC, Linepipe

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.

Key words: Sour environment, Hydrogen, HIC, SSC, Linepipe

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