Tensile Armor Wires Submitted to Slow Strain Rate Tests in a Corrosive Environment and Cathodic Protection: a Comparison Between Two Different Microstructures

Tagliari, Mariana dos Reis; Antunes, Marcio Ribeiro; Santos, Jaqueline Guimarães; Santos, Fabrício Pinheiro dos; Santos, João M. C.; Falcade, Tiago; Reguly, Afonso

doi:10.1590/1980-5373-mr-2018-0465

Cited by 8 publications

(5 citation statements)

References 34 publications

(33 reference statements)

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“…In this context, flexible risers may have to support static loading, either for tensile and flexion modes. The armours are made by high-strength carbon steel helically arranged, with chemical composition given in Table 1 [10].…”

Section: Methodsmentioning

confidence: 99%

Comparative study between crack tip opening displacement techniques by statistical analysis

Schmidt¹,

Lemos²,

Fabrício³

et al. 2021

Tecnol. Metal. Mater. Min.

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Standardized tests may not always achieve all their analytical objectives. Particularly to structural integrity, where a reproduction of the practical occurrences of the industry is desired, new techniques are being developed. Therefore, this work aims at evaluating fracture toughness in tensile armour through four measurement methodologies (standard, video, laser and stretch zone (SZ)) to obtain crack tip opening displacement (CTOD), and compares their responses by ANOVA and Duncan's tests. The findings showed equivalence between the standard and other approaches, thus allowing distinct methods for fracture toughness evaluation.

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Section: Methodsmentioning

confidence: 99%

Comparative study between crack tip opening displacement techniques by statistical analysis

Schmidt¹,

Lemos²,

Fabrício³

et al. 2021

Tecnol. Metal. Mater. Min.

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“…The microstructure of the wires, shown in Figure 3, is composed by highly cold-worked ferrite and perlite. Metallography showed great similarity to 70% cold drawn carbon steel microstructure [17] Tensile armor wires microstructures studied by Tagliari et al [18] also presented a longitudinal section with similar features.…”

Section: Stress Corrosion Cracking Tests At 20 Bar Co 2 Pressure and 60 °Cmentioning

confidence: 97%

Quantitative analysis of localized corrosion in tensile armor wire of flexible riser submitted to sweet stress corrosion cracking testing with crevice

Trindade¹,

Jesus²,

Reis³

et al. 2021

Tecnol. Metal. Mater. Min.

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Failure of flexible risers can occur, among several factors, due to their cold drawn carbon steel tensile armor wires collapse. These wires are susceptible to corrosion by seawater which increases propensity to a synergistic sweet stress corrosion mechanism, when they are associated with CO 2 -saturation, high tension, pressure, temperature, and crevices occurrence. In the present study, the influence of crevice in the annular region of flexible risers on the severity of pitting corrosion was quantified. Two different cold drawn carbon steel wires were compared. Corrosion tests by immersion were carried out on wires subjected to three-point bending in synthetic seawater environment at 0.1 MPa, 25 °C and 2 MPa, 60 °C. The crevice occurrence and the internal energy were significant intensifying factors for pitting corrosion, which was demonstrated by the higher frequency and depth of the pittings and by the arrangement of corrosion deposits in crevice assembly samples. The carbon content of the wire did not significantly influence corrosion.

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“…The strategies to predict the flexible riser's axisymmetric and bending responses are presented in what follows. These strategies rely on those proposed by [5] but are limited to assessing the tensile armor layers of flexible risers, as these armors are especially prone to fatigue failure.…”

Section: Local Analysismentioning

confidence: 99%

“…The main difficulties consist of knowing their design limits and, more importantly, determining the loads to which they would be subjected in service. [4,5].…”

Section: Introductionmentioning

confidence: 99%

A Coupled, Global/Local Finite Element Methodology to Evaluate the Fatigue Life of Flexible Risers Attached to Floating Platforms for Deepwater Offshore Oil Production

Alves,

Corrêa,

de Sousa

et al. 2024

Mathematics

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This study introduces a Finite Element (FE) hybrid methodology for analyzing deepwater offshore oil and gas floating production systems. In these systems, flexible risers convey the production and are connected to a balcony on one side of the platform. The proposed methodology couples, in a cost-effective manner, the hydrodynamic model of the platform with the FE model that represents the risers and the mooring lines, considering all nonlinear dynamic interactions. The results obtained and the associated computational performance are then compared with those from traditional uncoupled analyses, which may present inaccurate results for deepwater scenarios, and from fully coupled analyses that may demand high computational costs. Moreover, particular attention is dedicated to integrating global and local stress analyses to calculate the fatigue resistance of the flexible riser. The results demonstrate that the coupled global analyses adequately capture the asymmetric behavior due to all risers being connected to one of the sides of the platform, thus resulting in a more accurate distribution of fatigue damage when compared to the uncoupled methodology. Also, fatigue life is significantly affected by adequately considering the coupling effects.

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Tensile Armor Wires Submitted to Slow Strain Rate Tests in a Corrosive Environment and Cathodic Protection: a Comparison Between Two Different Microstructures

Cited by 8 publications

References 34 publications

Comparative study between crack tip opening displacement techniques by statistical analysis

Comparative study between crack tip opening displacement techniques by statistical analysis

Quantitative analysis of localized corrosion in tensile armor wire of flexible riser submitted to sweet stress corrosion cracking testing with crevice

A Coupled, Global/Local Finite Element Methodology to Evaluate the Fatigue Life of Flexible Risers Attached to Floating Platforms for Deepwater Offshore Oil Production

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