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

Al-Owaisi, Sultan; Becker, A.A.; Sun, Wei

doi:10.1016/j.engfailanal.2016.04.032

Cited by 58 publications

(9 citation statements)

References 24 publications

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“…These studies indicate that the maximum cross-sectional loss is a good parameter to correlate the residual load-bearing capacity of damaged pipeline. Other related studies on corroded tubes suggests that the presence of corrosion in the internal or external surface of a pipeline wall, may result in a serious threat to the structural integrity of the pipeline [17][18][19][20][21][22].…”

Section: Accepted Manuscript N O T C O P Y E D I T E Dmentioning

confidence: 99%

Modeling Deformation of Corroded Buried Steel Pipes and Design of Protective Measure

Wordu

Tee

Shafiee

2019

Journal of Pressure Vessel Technology

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Corrosion damage is reported to be one of the leading causes of steel pipeline failure causing significant financial losses to operators and damage to the surrounding environment. As part of a rising confrontation to pipeline integrity management, researchers are continuously seeking better ways to assist on how to identify, assess, and prevent such incidents. Thus, there is a crucial need to establish a connection between assessment of pipeline condition and its structural stability. To achieve this, a three-dimensional finite element (FE) model is developed. The effects of geometry parameters such as defect thickness and spread angle are considered. Results show that thicker pipelines with corrosion groove perform better structurally than slender equivalents. The impact of corrosion damage is assessed to be significant on pipe stability with pipelines experiencing higher displacement and wall stresses with increasing defect depth and spread angle. A protective measure has been proposed using the buried pipes bedding system. The most critical spread angle is at 60 deg for unprotected pipe sections and 90 deg for bedded protected sections.

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Section: Accepted Manuscript N O T C O P Y E D I T E Dmentioning

confidence: 99%

Modeling Deformation of Corroded Buried Steel Pipes and Design of Protective Measure

Wordu

Tee

Shafiee

2019

Journal of Pressure Vessel Technology

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“…The uniaxial stress-strain data were used as input to Abaqus where isotropic hardening was assumed in the FE analysis. Two failure criteria are specified for single defects and interacting defects [39].…”

Section: Preliminary Finite Element Simulationsmentioning

confidence: 99%

“…A separate failure criterion is adopted for defect interaction. Defect interaction is deemed to occur when the von Mises equivalent stress value along the spacing line between the two defects reaches a value between the engineering UTS and the true UTS, at or before the wall thickness ligament [39].…”

Section: Preliminary Finite Element Simulationsmentioning

confidence: 99%

An experimental investigation of the effect of defect shape and orientation on the burst pressure of pressurised pipes

Al-Owaisi

Becker

Sun

et al. 2018

Engineering Failure Analysis

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The burst pressure of commonly used ductile steel pipes in oil and gas industries, i.e. X52 and X60, is measured under internal pressure loading. The pipes were machined with circular and boxed defects at different orientations to simulate actual metal loss defects. Defect shapes and orientations were investigated in detail to study how they affect the failure behaviour of interacting defects. The experimental burst pressure results were compared with those obtained using existing analytical methods from Design Codes. Comparison of the results showed conservatism in the existing analytical methods which may potentially lead to unnecessary plant shutdowns and pipe repairs. The outcome of the experimental tests revealed that the shapes of the defects have very small influence on the defect interaction behaviour. The burst tests interestingly showed that the defect orientation has an important effect on defect interaction. Defects oriented in the hoop and diagonal directions showed no defect interaction even when spaced by a distance of one wall thickness, while defects oriented in the longitudinal directions showed that defects interact even when the spacing is up to six wall thickness but the interaction fades away for defects spaced at longer distances. Highlights Experimental 31 pipe burst tests with machined metal loss defects analysed  The effects of defect shape, orientation and interaction are investigated  Results compared with existing analytical methods from Design Codes  Degree of conservatism in the existing design codes discussed  Results show that defect orientation has an important effect on defect interaction

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“…Yu et al [33] concluded that the loading path has a great influence on the ultimate load of the steel pipeline, and the p→T loading path is more serious than the T→p loading path. Although scholars have conducted a lot of research on the buckling of corroded steel pipelines, the formula for buckling pressure of corrosion steel pipelines under the combined action of external pressure and axial force is rarely involved [34][35][36][37], which is more convenient for engineering practice.…”

Section: Introductionmentioning

confidence: 99%

Buckling Analysis of Corroded Pipelines under Combined Axial Force and External Pressure

Chen

2022

Metals

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Affected by a complex environment, corrosion is a common defect in steel pipelines. Moreover, steel pipelines are subjected to large axial forces during their installation and operation. Corroded deep-sea steel pipelines are prone to local buckling under complex loads. Therefore, in view of this problem, the collapse response of corroded steel pipelines under the combined axial force and external pressure is analyzed in detail. First, a formula for evaluating the collapse pressure of corroded steel pipelines under external pressure and axial force is proposed. Then, the factors affecting the collapse pressure of the steel pipeline are parameterized by using the finite element method. The accuracy of the finite element model is proved by collapse tests of the corroded steel pipeline. As shown in finite element results, the diameter-to-thickness ratio, initial ovality and corrosion defect size have significant effects on the buckling response of a steel pipeline. The collapse pressure of the steel pipeline decreases as the axial force increases. Finally, based on the finite element simulation results, the parameter variables in the evaluation formula are obtained.

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

Cited by 58 publications

References 24 publications

Modeling Deformation of Corroded Buried Steel Pipes and Design of Protective Measure

Modeling Deformation of Corroded Buried Steel Pipes and Design of Protective Measure

An experimental investigation of the effect of defect shape and orientation on the burst pressure of pressurised pipes

Buckling Analysis of Corroded Pipelines under Combined Axial Force and External Pressure

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