Failure Analysis of a Steel Elbow Pipe from a Gas Well

García-Martínez, María; González, Ma Pilar Valles; Meije, Alejandro González; Pastor, A.

doi:10.1007/s11668-020-00870-5

Cited by 5 publications

(4 citation statements)

References 11 publications

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“…As an important component of the oil and gas transportation pipeline, the elbow plays a role in changing the direction of oil and gas transportation [1][2]. Compared with the steel pipe used in mass production, the elbow manufacturing process is more complex, the quality control of the same batch of products fluctuates greatly, and the performance of different sampling parts of a single product also fluctuates, so its quality directly determines the operation safety of the whole pipeline [3][4][5]. Because of the initial ellipticity and uneven thickness of the pipe elbow during bending, the complex multi-axial stress state is formed at the elbow of high temperature and high-pressure pipe, which becomes the key part of life loss analysis.…”

Section: Introductionmentioning

confidence: 99%

Quality inspection and defect analysis of a batch of long radius elbows for oil and gas transportation

Feng²,

Li³

et al. 2022

International Conference on Advanced Sensing and Smart Manufacturing (ASSM 2022)

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Given the quality problem of a batch of oil and gas long radius elbow found on site, a quality sampling inspection was carried out. The quality was tested by a penetrant test, geometric dimensions measurement, chemical composition analysis, and a hardness test. Metallographic analysis was carried out about the defects found. It can be seen that no obvious abnormality was found in the profile size, remaining wall thickness, chemical composition analysis, and hardness test results of this batch of elbows. There is a longitudinal crack with a length of 10 mm on the outer surface of the pipe end of the DN50 elbow. According to anatomical analysis, this defect is a shallow crack on the outer surface, with a certain angle between the crack and the outer surface of the pipe. The maximum depth in the cross-section is 0.24 mm, and the vertical depth from the outer surface is 0.12 mm. It is speculated that these cracks occurred before solution treatment and are related to the original defects of the parent pipe or mechanical damage during cold work.

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Section: Introductionmentioning

confidence: 99%

Quality inspection and defect analysis of a batch of long radius elbows for oil and gas transportation

Feng²,

Li³

et al. 2022

International Conference on Advanced Sensing and Smart Manufacturing (ASSM 2022)

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“…40,44 Moreover, the material degradation and damage accumulation in these structures can be intensified under environmental conditions such as corrosive and high temperature. 41 For instance, steel elbow pipes of A234 WPB used in gas wells can be exposed to fatigue loads in the presence of corrosion defects. 41 In order to prevent catastrophic failures and high repair costs in petrochemical, offshore, gas production, and nuclear industries, it is important to design pipeline systems against harsh loading conditions and to suggest design considerations for the safe working conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Steel elbows are used in various industries, namely, refineries, petrochemical, offshore structures, power plants, steam systems, and nuclear powerplant pipelines. [40][41][42][43] The elbow pipes can be introduced as critical segments of pipeline systems in the aforementioned industries which can undergo seismic, earthquake, wind, wave, and vibrational load types and lead to different damage phenomenon such as fatigue, fatigue-ratchet, and plastic collapse. 40,44 Moreover, the material degradation and damage accumulation in these structures can be intensified under environmental conditions such as corrosive and high temperature.…”

Section: Introductionmentioning

confidence: 99%

“…41 For instance, steel elbow pipes of A234 WPB used in gas wells can be exposed to fatigue loads in the presence of corrosion defects. 41 In order to prevent catastrophic failures and high repair costs in petrochemical, offshore, gas production, and nuclear industries, it is important to design pipeline systems against harsh loading conditions and to suggest design considerations for the safe working conditions. In this way, the present paper, which is a part of systematic researches performed by the authors, 15,17,20 and its corresponding findings can be helpful to improve the knowledge about the ratcheting behavior of a specified elbow pipe used in gas production and petrochemical industry.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and numerical analysis of ratcheting behavior of A234 WPB steel elbow joints including corrosion defects

Moradi

Shariati

Zamani

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

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In this paper, ratcheting behavior of intact and corroded 90o elbow pipe specimens of A234 WPB steel is investigated at intrados, crown, and extrados positions. A special fixture was designed and constructed to carry out the fatigue experiments. Then, the effects of fatigue loading parameters (mean and amplitude) and defect depth were examined on ratcheting responses of intact and corroded specimens at intrados, crown, and extrados positions. To simulate the ratcheting behavior of specimens, a finite element analysis was performed based on the combined nonlinear isotropic/kinematic hardening model. As a reasonable agreement was found between the finite element (FE) simulation results and experimental data, the influence of constant internal pressure during the cyclic loading was examined on ratcheting responses through FE simulation. Results indicated that decreasing the load amplitude was more effective on decreasing the ratcheting strain than that of the mean fatigue load. Moreover, the most critical ratcheting response was associated with the intrados location of the pipe. For defective specimens, decreasing fatigue loading parameters resulted in a shakedown behavior for a defect placed at extrados, while, for the defects at intrados and crown, an increasing behavior was observed for the ratcheting strain. It was revealed that, at extrados position, the ratcheting behavior was arrested up to 1 mm defect depth. The ratcheting strains were increased at intrados and crown by increasing the internal pressure, while they were decreased at extrados.

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Corrosion-Fatigue Life of 35 Steel in Tap Water Under Additional Cavitation Loading

2022

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Failure Analysis of a Steel Elbow Pipe from a Gas Well

Cited by 5 publications

References 11 publications

Quality inspection and defect analysis of a batch of long radius elbows for oil and gas transportation

Quality inspection and defect analysis of a batch of long radius elbows for oil and gas transportation

Experimental and numerical analysis of ratcheting behavior of A234 WPB steel elbow joints including corrosion defects

Corrosion-Fatigue Life of 35 Steel in Tap Water Under Additional Cavitation Loading

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