Simulation of Hydrogen Distribution in Pipeline with Double Corrosion Defects

doi:10.11902/1005.4537.2023.333

Journal of Chinese Society for Corrosion and protection

2024, Vol. 44

Issue (2): 335-344 DOI: 10.11902/1005.4537.2023.333

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Simulation of Hydrogen Distribution in Pipeline with Double Corrosion Defects

GUO Shiwen¹^,², WU Haozhi¹^,², DONG Shaohua¹^,²(

), CHEN Lin¹^,², CHENG Frank³

^1.School of Safety and Ocean Engineering, China University of Petroleum Beijing, Beijing 102249, China
^2.Key Laboratory of Oil and Gas Safety and Emergency Technology, Ministry of Emergency Management, University of Petroleum Beijing, Beijing 102249, China
^3.Schulich School of Engineering, University of Calgary, Calgary T2N 1N4, Canada

Cite this article:

GUO Shiwen, WU Haozhi, DONG Shaohua, CHEN Lin, CHENG Frank. Simulation of Hydrogen Distribution in Pipeline with Double Corrosion Defects. Journal of Chinese Society for Corrosion and protection, 2024, 44(2): 335-344.

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Abstract

To deliever mixed natural gas and hydrogen with the existed natural gas pipelines is an important way to achieve efficient hydrogen transportation. However, corrosion defects present on these aged pipelines will affect the diffusion and enrichment of hydrogen atoms, potentially causing hydrogen embrittlement in the pipeline steel and further leading to the pipeline failure. In addition, corrosion defects on pipelines often exist in the form of adjacent double corrosion defects and even multiple corrosion defect groups. The interaction between adjacent defects can complicate the hydrogen diffusion and enrichment behavior, and ultimately affect the hydrogen induced failure behavior of the pipeline. In order to study the distribution of hydrogen concentration on pipelines containing double corrosion defects, a finite element model coupled with stress field and diffusion field was developed. The influence mechanism of corrosion defect length, defect spacing and applied tensile strain on hydrogen diffusion and enrichment behavior in steel was investigated in terms of the stress coupling behavior between the two corrosion defects. The results showed that the existence of corrosion defects caused the accumulation of hydrogen atoms in steel, and the value and location of the maximum hydrogen concentration in accumulation area changed with tensile strain, defect length and defect spacing. However, when the distance between the two defects is large enough, they will not have a superposition effect on the hydrogen diffusion and enrichment, and thus they can be regarded as two independent defects. This study provides a theoretical reference for the safety assessment of hydrogen damage in hydrogen transmission pipelines with double corrosion defects.

Key words: double corrosion defects hydrogen distribution finite element modeling X52 pipeline steel

Received: 23 October 2023 32134.14.1005.4537.2023.333

ZTFLH:

TE832

Fund: Science Foundation of China University of Petroleum, Beijing(2462023BJRC020)

Corresponding Authors: DONG Shaohua, E-mail: shdong@cup.edu.cn

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	GUO Shiwen
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https://www.jcscp.org/EN/10.11902/1005.4537.2023.333 OR https://www.jcscp.org/EN/Y2024/V44/I2/335

Fig.1 Schematic diagram of a two-dimensional pipe model with double internal corrosion defects

Fig. 2 Distributions of hydrostatic stress at single defect with length of 10 and 20 mm, double defects with spacing of 0, 5 and 10 mm under tensile strain of 0.5%

Fig.3 Distributions of hydrogen concentrations at single defect with a length of 20 mm and double defects with a spacing of 0 mm under tensile strains of 0% (a), 0.1% (b), 0.2% (c) and 3% (d)

Table 1 Maximum hydrogen concentrations at double defects with different spacing under different tensile strains (mol/m³)

Fig.4 Distributions of hydrogen concentrations at double defects with different spacing (0, 5, 10 and 15 mm) under 0.5% tensile strain

Fig.5 Distributions of hydrogen concentrations at double defects with different spacing (0, 5, 10 and 15 mm) under 1% tensile strain

Fig.6 Linear distributions of hydrogen concentrations along the model bottom of double corrosion defects with a spacing of 0 mm (a), 5 mm (b), 10 mm (c) and 15 mm (d)

Table 2 Maximum hydrogen concentrations at double defects with different lengths and different spacing under different tensile strains (mol/m³)

Fig.7 Distributions of hydrogen concentrations at double corrosion defects with a spacing of 10 mm under different tensile strains and defect lengths

Table 3 Maximum hydrogen concentrations at double defects and single defect (mol/m³)

Fig.8 Distributions of hydrogen concentrations at single defect with a length of 20 mm and double defects with a spacing of 0 mm under tensile strains of 0.5% and 0.1%

Fig.9 Distributions of hydrogen concentrations at double defects with a spacing of 15 mm and single defect with a length of 10 mm under tensile strains of 0.5% and 0.1%

Fig.10 Linear distributions of hydrogen concentrations along the model bottom of single corrosion defect with a length of 10 mm (a) and 20 mm (b)

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