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CO2-SCC in Flexible Pipe Carbon Steel Armour Wires

Abstract : Carbon dioxide-induced stress corrosion cracking (CO2-SCC) is an environmentally assisted corrosion cracking phenomenon that has recently been identified as a new failure mode in flexible pipe armor wires. The phenomenon has been observed to take place notably in severe CO2 environments and is a cause of great concern to the flexible pipe industry. As its detection, a diverse and extensive testing program has been established to develop an understanding of the phenomenon and define safe application limits for carbon steel wires to prevent the initiation of CO2-SCC. Several different testing methodologies have been explored and small-scale laboratory testing has played an instrumental role in this overall effort. This paper focuses on the results from three different small-scale testing methodologies and the impact of different parameters such as CO2 fugacity, temperature, and confinement that play a crucial role in the initiation of CO2-SCC. Furthermore, careful prominence has been given to the test setup and methodology that has been rigorously developed over the last few years. With this developed protocol in place, CO2-SCC has been effectively reproduced on all wire grades in a small-scale testing environment. Results have also shown that for a CO2 fugacity greater than 15 bar and applied stress at 100% of the actual yield strength, all existing wire grades are susceptible to CO2-SCC thus creating significant limitations to flexible pipe design with respect to this new failure phenomenon.
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https://hal-ifp.archives-ouvertes.fr/hal-03748596
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Submitted on : Friday, August 12, 2022 - 3:27:34 PM
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R. de Motte, G. Joshi, T. Chehuan, R. Legent, J. Kittel, et al.. CO2-SCC in Flexible Pipe Carbon Steel Armour Wires. Corrosion, National Association of Corrosion Engineers, 2002, 78 (6), pp.547-562. ⟨10.5006/4025⟩. ⟨hal-03748596⟩

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