Mathematical model elaboration in terms of baking time influence on the resistance to stress corrosion cracking under tension

Abaev, Z. K.; Galachieva, S

doi:10.1109/icieam.2016.7911569

2016 2nd International Conference on Industrial Engineering, Applications and Manufacturing (ICIEAM) 2016

DOI: 10.1109/icieam.2016.7911569

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Mathematical model elaboration in terms of baking time influence on the resistance to stress corrosion cracking under tension

Z. K. Abaev

S Galachieva

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“…Such prediction is impossible without the kinetic equation of the corrosion process, which accounts for the specific factors determining the rate of «groove» corrosion. It should be noted that the proposed equation does not take into account the mechanisms of hydrogen sulfide cracking [17][18][19], stress-corrosion processes [20][21][22], and destruction of pipelines due to stress corrosion cracking [23][24][25].…”

mentioning

confidence: 99%

Development of the Kinetic Equation of the Groove Corrosion Process for Predicting the Residual Life of Oil-Field Pipelines

Popov,

Bolobov,

Zhuikov

et al. 2023

Energies

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One of the main reasons for oil-field pipeline failure is groove corrosion. The residual life of such pipelines is estimated based on defectoscopy corrosion rate—a ratio of the formed «groove» depth to the pipeline operation start time. In this case, it is supposed that, in the future, the «groove» will deepen at the same rate for the remaining period of the pipe’s operation. However, sometimes, oil-field pipeline operation experience shows that the remaining time of safe operation is much less than the calculated one. In this article, such a discrepancy is explained via the acceleration of the groove corrosion rate in the process of «groove» deepening due to the increasing level of mechanical stresses in the surrounding metal, which intensifies the corrosion process as a result of the mechanochemical effect. Based on a literature analysis and calculated data, the kinetic equation of the groove corrosion rate for an oil-field pipeline is proposed, which accounts for the acceleration of the process rate as the pipeline is operated and allows the more accurate estimation of its remaining service life.

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mentioning

confidence: 99%

Development of the Kinetic Equation of the Groove Corrosion Process for Predicting the Residual Life of Oil-Field Pipelines

Popov,

Bolobov,

Zhuikov

et al. 2023

Energies

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Methodology for testing pipeline steels for resistance to grooving corrosion

Popov

2021

PMI

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The methodology for testing pipeline steels is suggested on the assumption that for the destruction of pipes in field oil pipelines by the mechanism of grooving corrosion the simultaneous fulfillment of such conditions as the occurrence of scratches on the lower generatrix of the pipe, eventually growing into a channel in the form of a groove, emulsion enrichment with oxygen, presence of pipe wall metal in a stressed state, presence of chlorine-ion in the oil-water emulsion is required. Tests are suggested to be carried out in 3 % aqueous solution of NaCl with continuous aeration by air on bent plates 150×15×3 mm, made of the analyzed steel, the middle part of which is under the action of residual stresses σres, close to the level of maximum equivalent stresses σeqv in the wall of the oil pipeline, with the presence of a cut on this part on the inner side of the plate as an initiator of additional mechanical stresses. Using the value of the modulus of normal elasticity of the analyzed steel, the degree of residual strain of the elastic-plastic body from this material, corresponding to the value σres ≈ σeqv is calculated, based on which the plates are bent to the required deflection angle, after which the cut is applied to them. After keeping the plates in the corrosive medium for each of them the increase in depth of the cut as a result of corrosion of the walls by the corrosive medium is analyzed, from which the rate of steel K by the mechanism of grooving corrosion is calculated taking into account the duration of tests. Corrosion rate values for two pipe steel grades determined by the suggested procedure are given. The comparison of K values obtained leads to the conclusion about the higher resistance to grooving corrosion of 09G2S steel.

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Mathematical model elaboration in terms of baking time influence on the resistance to stress corrosion cracking under tension

Cited by 2 publications

References 2 publications

Development of the Kinetic Equation of the Groove Corrosion Process for Predicting the Residual Life of Oil-Field Pipelines

Development of the Kinetic Equation of the Groove Corrosion Process for Predicting the Residual Life of Oil-Field Pipelines

Methodology for testing pipeline steels for resistance to grooving corrosion

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