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51312-01577-Effect of H2S and CO2 on Fatigue Corrosion Crack Growth and Fracture Toughness of X65 in Offshore Oi

Picture for Effect of H2S and CO2 on Fatigue Corrosion Crack Growth and Fracture Toughness of X65 in Offshore Oi
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Product Number: 51312-01577-SG
ISBN: 01577 2012 CP
Author: Feng Gui
Publication Date: 2012
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API 5L X65 is commonly used in various offshore projects for risers and flow lines in various environments ranging from sweet to sour service. Corrosion fatigue crack growth rate (FCGR) and fracture toughness have been investigated in a series of sweet and sour environments. This paper focused on the gaps that were not addressed in other studies. The effects of two levels of H2S and three levels of CO2 on the FCGR and fracture toughness were investigated. Frequency scan was conducted to obtain the frequency at which the FCGR would plateau. The highest frequency at which the FCGR attained a plateau will be used to determine the da/dN vs. DK curve. The data will be also be modeled based on the superposition principle of environmentally assisted fatigue to determine the role of hydrogen diffusion through the crack tip process zone versus surface reaction kinetics at the crack tip in generating hydrogen.
API 5L X65 is commonly used in various offshore projects for risers and flow lines in various environments ranging from sweet to sour service. Corrosion fatigue crack growth rate (FCGR) and fracture toughness have been investigated in a series of sweet and sour environments. This paper focused on the gaps that were not addressed in other studies. The effects of two levels of H2S and three levels of CO2 on the FCGR and fracture toughness were investigated. Frequency scan was conducted to obtain the frequency at which the FCGR would plateau. The highest frequency at which the FCGR attained a plateau will be used to determine the da/dN vs. DK curve. The data will be also be modeled based on the superposition principle of environmentally assisted fatigue to determine the role of hydrogen diffusion through the crack tip process zone versus surface reaction kinetics at the crack tip in generating hydrogen.
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Fatigue Crack Growth Rate (FCGR) and fracture toughness behavior of high strength steels used in drilling riser applications was investigated in sour environments. Frequency scan tests were performed were performed on X80 C110 and S135 in moderate to mildly sour environments.
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Role of Crack Tip Strain Rate on the Fatigue and Fracture Behavior of Line Pipe Steel in Sour Environments

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Fatigue and fracture of line pipe steels in a sour inhibited environment is presented. Fatigue crack growth rate (FCGR) was investigated as a function of frequency at several different K values at a pH of 3.5 and 0.21psia (0.00144MPa) H2S. 
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