Dependence of Burst Strength on Crack Length of a Pipe with a Dent-Crack Defect

Ghaednia, Hossein; Das, Sreekanta; Wang, Rick; Kania, Richard

doi:10.1061/(asce)ps.1949-1204.0000259

Cited by 7 publications

(13 citation statements)

References 20 publications

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“…The pipeline system is one of the most capital-intensive infrastructure systems. Recent investigations of pipeline performance have shown that one of the primary reasons for pipeline failure is corrosion [1,2]. Common types of corrosion that may occur in practice include uniform corrosion, pitting corrosion, crevice corrosion, and galvanic corrosion [3].…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of Composite Repair for Damaged Steel Pipeline

et al. 2021

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Carbon fiber reinforced polymer (CFRP) matrix composite overwrap repair systems have been introduced and accepted as an alternative repair system for steel pipeline. This paper aimed to evaluate the mechanical behavior of damaged steel pipeline with CFRP repair using finite element (FE) analysis. Two different repair strategies, namely wrap repair and patch repair, were considered. The mechanical responses of pipeline with the composite repair system under the maximum allowable operating pressure (MAOP) was analyzed using the validated FE models. The design parameters of the CFRP repair system were analyzed, including patch/wrap size and thickness, defect size, interface bonding, and the material properties of the infill material. The results show that both the stress in the pipe wall and CFRP could be reduced by using a thicker CFRP. With the increase in patch size in the hoop direction, the maximum von Mises stress in the pipe wall generally decreased as the maximum hoop stress in the CFRP increased. The reinforcement of the CFRP repair system could be enhanced by using infill material with a higher elastic modulus. The CFRP patch tended to cause higher interface shear stress than CFRP wrap, but the shear stress could be reduced by using a thicker CFRP. Compared with the fully bonded condition, the frictional interface causes a decrease in hoop stress in the CFRP but an increase in von Mises stress in the steel. The study results indicate the feasibility of composite repair for damaged steel pipeline.

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Section: Introductionmentioning

confidence: 99%

Finite Element Analysis of Composite Repair for Damaged Steel Pipeline

et al. 2021

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“…Mechanical damage like cracks, scratches, and gouges often occur inside dents in pipelines. The combined defects are considered more injurious to pipeline integrity than plain defects [1][2][3][4][5][6]. An example of combined defects found in pipelines is a crack inside a dent, also known as a dent-crack defect [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…The combined defects are considered more injurious to pipeline integrity than plain defects [1][2][3][4][5][6]. An example of combined defects found in pipelines is a crack inside a dent, also known as a dent-crack defect [2][3][4]. Vilkys et al [7] showed that gouge depths greater than 50% of wall thickness cause stresses higher than yield strength of pipe material and cracks are likely to initiate at the tip of such gouges under normal operating pressure.…”

Section: Introductionmentioning

confidence: 99%

“…Very few full-scale experimental studies on dent-crack defects in pipelines have been accomplished [2][3][4][5], mainly because of the difficulty in creating artificial cracks for experiments. Usually, the cracks are represented by notches and gouges [9] with a small fatigue crack at the tip.…”

Section: Introductionmentioning

confidence: 99%

“…In the absence of analytical models, the finite element method (FEA) has been successfully used to evaluate burst pressures of pipelines with dent-crack defects [2][3][4]. But, it lacks an in-built criterion for determining burst pressure.…”

Section: Introductionmentioning

confidence: 99%

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Crack Propagation and Burst Pressure of Pipeline with Restrained and Unrestrained Concentric Dent-Crack Defects Using Extended Finite Element Method

Okodi

Cheng

et al. 2020

Applied Sciences

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Mechanical damage in form of dents, cracks, gouges, and scratches are common in pipelines. Sometimes, these damages form in proximity of each other and act as one defect in the pipe wall. The combined defects have been found to be more injurious than individual defects. One of the combined defects in pipeline comprises of a crack in a dent, also known as dent-crack defect. This paper discusses the development of finite element models using extended finite element criterion (XFEM) in Abaqus to predict burst pressure of specimens of API X70 pipeline with restrained and unrestrained concentric dent-crack defects. The models are calibrated and validated using results of full-scale burst tests. The effects of crack length, crack depth, dent depth, and denting pressure on burst pressure are investigated. The results show that restrained dent-crack defects with shallow cracks (depth less than 50% wall thickness) inside dents do not affect pipeline operations at maximum allowable operating pressure if crack lengths are less than 200 mm. Releasing restrained dent-cracks when the pressure is at maximum allowable operating pressure can cause propagation of deep cracks (depth of 50% wall thickness or more) longer than 60 mm. However, only very long cracks (200 mm and higher) propagate to burst the pipe. Cracks of depth less than 20% of wall thickness inside dents formed at zero pressure are not propagated by the maximum allowable operating pressure. Dent-crack defects having dents of depth less than 2% outside diameter of pipe behave as plain cracks if the dents are formed at zero denting pressure but are more injurious than plain cracks if the dents are formed in pressurized pipes.

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