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SCC Of Tensile Wires At High CO2 Partial Pressure In Simulated Annulus Environments Of Flexible Pipes

Picture for SCC Of Tensile Wires At High CO2 Partial Pressure In Simulated Annulus Environments Of Flexible Pipes
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Unbonded flexible pipes used for transporting process fluids in offshore oil and gas production systems have a complex structure, with alternate polymer and metallic layers. Tensile armors are metallic layers constructed by the helical wrapping of high strength carbon steel wires, and they are responsible for the integrity of the pipe. These armors provide axial strength and torsion resistance to the pipe so that it can sustain its own weight and resist to stresses associated to environmental conditions and vessel motion.

Product Number: 51322-17898-SG
Author: Pedro Netto da Silva, Gaute Svenningsen, Arne Dugstad, José Antônio da Cunha Ponciano Gomes
Publication Date: 2022
Industries: Cathodic Protection , Corrosion Monitoring and Control , Coatings and Linings , Coatings
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The CO2-SCC susceptibility of tensile wires of flexible pipes was investigated. Wire specimens were tensioned in four-point bending jigs and exposed to different simulated annulus environments at high CO2 partial pressure. Unloaded specimens were exposed to the same test environments and corrosion rates were calculated from their mass loss. Artificial sea water solutions at different temperatures were used as electrolyte. Some specimens were pre-corroded in aerated artificial sea water before exposure to the CO2 environments. The corroded surface of the specimens after removal of corrosion products was analyzed using scanning electron microscopy. Cracks associated with localized attacks were observed in the tensioned specimens exposed to some of the simulated conditions. Temperature and pre-corrosion in aerated sea water influenced cracking susceptibility significantly.

The CO2-SCC susceptibility of tensile wires of flexible pipes was investigated. Wire specimens were tensioned in four-point bending jigs and exposed to different simulated annulus environments at high CO2 partial pressure. Unloaded specimens were exposed to the same test environments and corrosion rates were calculated from their mass loss. Artificial sea water solutions at different temperatures were used as electrolyte. Some specimens were pre-corroded in aerated artificial sea water before exposure to the CO2 environments. The corroded surface of the specimens after removal of corrosion products was analyzed using scanning electron microscopy. Cracks associated with localized attacks were observed in the tensioned specimens exposed to some of the simulated conditions. Temperature and pre-corrosion in aerated sea water influenced cracking susceptibility significantly.

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High strength carbon steel tensile wires confined in the annulus of flexible pipes might experience corrosion when the annulus is flooded with water, either due to outer sheath breaches or to condensation of water molecules permeating from the bore through the inner sheath. Carbon dioxide (CO2) molecules may also permeate from the bore and reach the annulus, where it dissolves into water to form carbonic acid (H2CO3).
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51315-5829-Corrosion Testing of Steel Armour Wires in Flexible Pipes—A Parametric Study

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