The effect of the width to length ratios of corrosion defects on the burst pressures of transmission pipelines

Fekete, G.; Varga, L.

doi:10.1016/j.engfailanal.2011.12.002

Cited by 79 publications

(24 citation statements)

References 10 publications

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“…The material is modelled as an isotropic elasto-plastic material and true stress-true strain data are employed within Abaqus. It is acknowledged that some anisotropic behaviour does exist in the pipes as a result of the manufacturing processes; however, considering that the isotropic behaviour has yielded accurate results in terms of predicting failure pressure as reported by many researchers in the past [8,11,15,16,[26][27][28], only an isotropic hardening rule is used in this work. The true stress-strain values are obtained from the engineering uniaxial stress-stress data using equations (1) and (2) which are only valid up to necking where the loading situation is no longer uniaxial throughout the gauge length [29]:…”

Section: Materials Propertiesmentioning

confidence: 99%

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Analysis of shape and location effects of closely spaced metal loss defects in pressurised pipes

Al-Owaisi

Becker

Sun

2016

Engineering Failure Analysis

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription.For more information, please contact eprints@nottingham.ac.uk AbstractMetal loss due to corrosion is a serious threat to the integrity of pressurised oil and gas transmission pipes. Pipe metal loss defects are found in either single form or in groups (clusters). One of the critical situations arises when two or more defects are spaced close enough to act as a single lengthier defect with respect to the axial direction, causing pipe ruptures rather than leaks, and impacting on the pressure containing capacity of a pipe. There have been few studies conducted to determine the distance needed for defects to interact leading to a failure pressure lower than that when the defects are treated as single defects and not interacting. Despite such efforts, there is no universally agreed defect interaction rule and pipe operators around the world have various rules to pick and choose from. In this work, the effects of defects shape and location on closely spaced defects are analysed using finite element analysis. The numerical results showed that defect shapes and locations have a great influence on the peak stress and its location as well as the failure pressure of pipes containing interacting defects.

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Section: Materials Propertiesmentioning

confidence: 99%

“…Fekte et. al [27] considered the failure pressure of the corroded pipes to occur when the von Mises equivalent stress at the deepest point of the defect area reaches the true UTS of the considered pipe material.…”

Section: Failure Criteriamentioning

confidence: 99%

Analysis of shape and location effects of closely spaced metal loss defects in pressurised pipes

Al-Owaisi

Becker

Sun

2016

Engineering Failure Analysis

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“…DNV and BG have then developed a uniform DNV RP F101 [12] guideline to test corroded pipelines, based on finite element analysis and experimental studies. Several significant experimental and numerical studies were recently conducted by Cronin [13], Choi et al [14], Netto et al [15], Cosham et al [16], Chiodo and Ruggieri [17], Majid et al [18], Huang and Zhou [19], Zhu and Leis [20], Ma et al [21], Fekete and Varga [22], Alamilla et al [23], Abdalla Filho et al [24]. Though, their contributions are important, but focalized only on pipelines simple corrosion.…”

Section: Introductionmentioning

confidence: 95%

Pipelines Reliability Analysis Under Corrosion Effect and Residual Stress

et al. 2015

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This work focuses on a development of a finite element model that simulates corrosion phenomenon and its influence on structure rupture (pipelines). Subsequently, the pitting effect on reliability and pipelines lifetime is studied. In this paper, the investigated structure material is characterized experimentally, in order to determine the maximum strength and stress resistance. Therefore, a numerical model was developed under ANSYS code to simulate different loads to obtain the stress concentration factor as the stresses could surpass the yielding limit in the corrosion impact, and to determine the Von Mises stress. A corrosion model and residual stresses used in the literature are coupled with the probabilistic model to find the limit state function. Thus, failure probability and structure reliability index under the effect of pitting corrosion phenomena are calculated and the obtained results are discussed and analyzed.

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“…The most famous literature in the study focuses on the assessment of the residual strength of pipelines with corrosion defects in its straight parts [4][5][6][7][8][9][10][11][12][13][14][15].…”

mentioning

confidence: 99%

“…In modern studies, the strength and reliability of the design are often estimated using explicit modeling of corrosion damage [4][5][6][7][8][9][10][11][12][13][14][15], which is usually carried out in software complexes, followed by the use of the finite element method (FEM).…”

mentioning

confidence: 99%

Estimation of Residual Strength of Pipeline's Elbow With Volumetric Corrosion Defect, Which Is Developing

Larin¹,

Potopalska²

2017

Pratsi OPU

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ELBOW WITH VOLUMETRIC CORROSION DEFECT, WHICH IS DEVELOPINGО.О. Ларін, К.Є. Потопальська. Оцінка залишкової міцності криволінійної ділянки трубопроводу з корозійним об'ємним дефектом, що розвивається. Магістральні трубопроводи є найпоширенішим засобом транспортування нафтопродуктів або газу, їх призначено для тривалого використання. Під час експлуатації внаслідок дії агресивного середовища на поверхні трубопроводу можуть виникати та розвиватися поверхневі дефекти, які певною мірою впливають на міцність трубопроводу. Дослідження проводилося з метою оцінки залишкової міцності коліна трубопроводу з об'ємним дефектом, розвиток якого моделюється у часі. Оцінку характеристик напружено-деформованого стану пошкодженого елементу коліна трубопроводу проводили в рамках сучасних засобів комп'ютерного моделювання з використанням методу скінчених елементів (МСЕ). Корозійне пошкодження моделювали явно як об'ємний дефект на зовнішній поверхні коліна трубопроводу. На основі проведеного дослідження отримано результати з оцінки залишкової міцності магістрального трубопроводу зі зростаючим поверхневим дефектом в період експлуатації від 10 до 45 років. Визначено зони, в яких з'являється локалізація максимальних еквівалентних напружень та, відповідно, пластичних деформацій в залежності від розміру пошкодження. Опираючись на отримані результати можна зазначити, що в період експлуатації від 37 років трубопровід з відповідним дефектом не витримує можливе максимальне навантаження.Ключові слова: магістральний трубопровід, корозія, пошкодження, НДС, залишкова міцність O.O. Larin, K.E. Potopalska. Estimation of residual strength of pipeline's elbow with volumetric corrosion defect, which is developing.Pipelines are used as one of the most practical and low cost methods for transmission of different liquid petroleum products and gases. Damage on the pipeline is capable to appear during operation due to the accumulation of fatigue and arising of corrosion. The Aim is estimation the residual strength of pipeline's elbow with volumetric surface defect development of which is modeled in time. Deformed state assessment of damaged elbow of pipelines was held in the framework of computer modeling by using finite-element method (FEM). Corrosion damage modeled explicitly as volumetric defect on the outside of the knee pipeline. Based on the results of the study the assessment of the residual strength of pipeline with increasing surface defects in operation from 10 to 45 years has been obtained. Besides, the areas in which there is localization of maximum equivalent stresses and respectively plastic deformation depending on the size of damage were defined. By obtained results may be noted that after 37 years of operation the pipelines with the corresponding defect on surface cannot withstand the maximum load.

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The effect of the width to length ratios of corrosion defects on the burst pressures of transmission pipelines

Cited by 79 publications

References 10 publications

Analysis of shape and location effects of closely spaced metal loss defects in pressurised pipes

Analysis of shape and location effects of closely spaced metal loss defects in pressurised pipes

Pipelines Reliability Analysis Under Corrosion Effect and Residual Stress

Estimation of Residual Strength of Pipeline's Elbow With Volumetric Corrosion Defect, Which Is Developing

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