Failures and leak inspection techniques of tube-to-tubesheet joints: A review

Thekkuden, Dinu Thomas; Mourad, Abdel‐Hamid I.; Bouzid, Abdel‐Hakim

doi:10.1016/j.engfailanal.2021.105798

Cited by 43 publications

(9 citation statements)

References 269 publications

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“…Factors contributing to such failures include fouling, scaling, salt buildup, weld defects, and vibrations, which can stem from poor material selection, inadequate structural design, non-adherence to recommended operating practices, or human error [4,5] . These failures typically manifest as cracks, leaks, or blockages due to deposits on the tubes' inner surfaces, resulting in significant maintenance costs that, in many countries, reach approximately 0.25% of GDP [6] .…”

Section: Introductionmentioning

confidence: 99%

Exploring stress corrosion cracking in 2205 duplex stainless steel across varied stress thresholds

Zhao,

Wen,

Guo

et al. 2024

Preprint

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Reboilers are pivotal in the process of condensate oil stabilization, playing a significant role in reducing the vapor pressure to ensure product stability. The operational milieu of reboiler tube bundles is marked by extremities—high temperatures, elevated salinity, and the presence of dissolved oxygen—rendering them vulnerable to stress corrosion cracking. Such conditions can precipitate untimely degradation and disrupt production schedules. Addressing this, our research employed electrochemical noise measurement techniques to perform a statistical examination of the morphological characteristics of noise peaks, alongside time and frequency domain analyses for 2205 Duplex Stainless Steel(DSS), under an array of stress levels, ranging from 60%σs to 90%σs. Complementary Scanning Electron Microscopy analysis was utilized to discern microscopic changes pre- and post-corrosion exposure. Findings have demonstrated pronounced localized corrosion at each measured stress level, with localized corrosion index values spanning from 0.4290 to 0.9993. The presence of chloride ions was found to penetrate the passive film, selectively targeting the ferrite phase for pitting. Furthermore, the confluence of mechanical stress and corrosive elements facilitated the nucleation of crack tips, with oxygen and chloride ions synergistically escalating crack propagation. Our study concludes that the SCC of 2205 DSS follows a dual path: anodic dissolution alongside hydrogen embrittlement, culminating in surface pitting and intergranular cracking.

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Section: Introductionmentioning

confidence: 99%

Exploring stress corrosion cracking in 2205 duplex stainless steel across varied stress thresholds

Zhao,

Wen,

Guo

et al. 2024

Preprint

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“…It is generally understood today that cavitation erosion is mainly a kind of mechanical wear in consideration of its damage characteristics. In addition, cavitation erosion interacts with other damage such as corrosion and fretting on the components, and the damage induced by the erosion–corrosion accelerates thinning, causing severe leaks in the nuclear power equipment and resulting in huge investment loss [ 28 ].…”

Section: Introductionmentioning

confidence: 99%

“…Local corrosion is concentrated in some areas of the surface, developing to the longitudinal depth. Local corrosion includes pitting corrosion, slot corrosion, intergranular corrosion, and stress corrosion, among which stress corrosion is more harmful [ 28 ]. Local corrosion is not easily found, and it is more harmful than uniform corrosion.…”

Section: Introductionmentioning

confidence: 99%

A Review of Cavitation Erosion on Pumps and Valves in Nuclear Power Plants

Gao,

Guo,

2024

Materials

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The cavitation erosion failure of pumps or valves induces the low efficiency and reduced service life of nuclear reactors. This paper reviews works regarding the cavitation erosion of pumps and valves in the nuclear power industry and academic research field. The cavitation erosion mechanisms of materials of pumps and valves are related to the microstructure and mechanical properties of the surface layer. The cavitation erosion resistance of austenitic stainless steel can be ten times higher than that of ferritic steel. The cavitation erosion of materials is related to the hardness, toughness, and martensitic transformation capacity. Erosion wear and erosion–corrosion research is also reviewed. Erosion wear is mainly influenced by the hardness of the material surface. Erosion–corrosion behavior is closely connected with the element composition. Measures for improving the cavitation erosion of pumps and valves are summarized in this paper. The cavitation erosion resistance of metallic materials can be enhanced by adding elements and coatings. Adhesion, inclusion content, and residual stress impact the cavitation erosion of materials with coatings.

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“…For this reason, is essential to guarantee the strength and reliability of these joints [5][6][7][8]. Many efforts have been focused on detect and identify the defects that appear in these brazed joints since they are critical for a proper heat exchanger performance during operation [9,10].…”

Section: Introductionmentioning

confidence: 99%

Acoustic Emission and Digital Image Correlation Based Methods for Early Damage Identification during Heat Exchanger Testing

Garcia dela Yedra,

Muñoz,

Vivas

et al. 2023

Preprint

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Aircraft heat exchangers play a crucial role in maintaining thermal balance and ensuring that essential components operate efficiently and safely. In this context, it is highly relevant to gain knowledge about the deterioration and the predominant damage mechanisms of these components. In this study, two different non-destructive methods are employed to analyze the damage initiation of a heat exchanger part during fatigue test. On the one hand, Acoustic Emission technique is employed using membrane-free microphones capable of capturing a broad bandwidth. The acoustic events were classified by a machine learning algorithm to determine their source and damage mechanisms. On the other side, Digital Image Correlation (DIC) allowed the measurement of the strain evolution along the test and more precisely, redistributions were considered as damage indicators. As a result, it was identified that AE served as early damage indicator as the cumulative number of events was in good agreement with the severity of the damage. With respect to classification two clear clusters ascribed to different type of events were identified. In the case of DIC, strain redistributions gave clear indications of damage or deterioration but at a later stage compared to AE

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Failures and leak inspection techniques of tube-to-tubesheet joints: A review

Cited by 43 publications

References 269 publications

Exploring stress corrosion cracking in 2205 duplex stainless steel across varied stress thresholds

Exploring stress corrosion cracking in 2205 duplex stainless steel across varied stress thresholds

A Review of Cavitation Erosion on Pumps and Valves in Nuclear Power Plants

Acoustic Emission and Digital Image Correlation Based Methods for Early Damage Identification during Heat Exchanger Testing

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