Inner Defect Induced Crack Growth Analysis and Fatigue Life Prediction for Anthropogenic CO₂ Pipelines

Abstract:

One approach to limiting CO₂ emissions from oxidation of carbon-based fuels is to capture the CO₂ and store it, possibly in onshore or offshore subsurface geologic formations. From the CO₂ transportation structure perspective, a critical component of this approach is the pipeline transportation of supercritical or dense CO₂. In CCS, the pipelines undertaking a CO2 transportation task suffer various loads, the effects of which is easily aggravated due to the existence of a high working pressure (above 7.4MPa) and inner corrosion. For the application of anthropogenic CO₂ pipe transportation technique, this paper will address a LEFM-based finite element method which can evaluate fatigue life for a CO₂ transmission pipeline containing a semicircle inner defect. Specifically, a portion of welded round steel pipeline is selected as the object of our analysis. Under the inner pressure fluctuation scenarios, an FRANC2D finite element procedure is generated to simulate mode-I crack extension from a given inner edge crack, which initiates from the half circle defect,and the corresponding stress intension factors(SIFs), , and its increment, , varied with different cracking depths, are calculated and compared. Afterwards, the fatigue lives for the pipeline with the defects of different sizes are obtained by using a modified Paris formula which can analyze the influence of crack closure and stress ratio. Thus, the relation between the fatigue life of CO₂ pipelines and the dimension of the inner defect can be determined by performing the proposed fatigue crack growth analysis.

• Periodical: Applied Mechanics and Materials (Volumes 204-208)
• Pages: 2981-2984
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.204-208.2981
• Online since: October 2012
• Authors: Qiao Jin*, Ming Li, Quan Wen
• Keywords: Carbon Capture and Sequestration (CCS), Crack Growth, Fatigue Life Prediction, Inner Defect, Linear Elastic Fracture Mechanics (LEFM)

References

[1] GCEP energy assessment analysis staff. An assessment of carbon capture technology and research opportunities. GCEP technical assessment report from Standford university(2005).

[2] Paul W.P, Peter. F, Adam. V. Carbon dioxide pipelines for carbon sequestration: Emerging policy issues. CRS report for British Congress(2009).

[3] Du lei. et al. Oil&gas storage and transportation. (2010), 29(2),p.86. (In Chinese)

[4] Newman. J.C, Raju I.S. Engineering FractureMechanics.(1981),15(12),p.185.