Safe burst strength of a pipeline with dent–crack defect: Effect of crack depth and operating pressure

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

doi:10.1016/j.engfailanal.2015.06.005

Cited by 40 publications

(32 citation statements)

References 19 publications

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“…Comparing Equation with the crack propagation velocity of brittle materials

V = 0.38 \sqrt{\frac{E}{ρ}} ((), 1 - \frac{a_{normalc}}{a})

reveals that the brittle crack propagation velocity V does not correlate with σ ∞ ; however, the propagation velocity of the ductile materials is correlated with σ ∞ . When the applied stress is changing, the limiting propagation velocity of the crack will be affected.…”

Section: Crack Propagation Velocity Of Pipeline Ductile Hardening Matmentioning

confidence: 98%

Experimental study of unstable crack propagation velocity for X80 pipeline steel

Dong

Zhang

et al. 2018

Fatigue Fract Eng Mat Struct

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Unstable crack propagation velocity following the failure of pipeline steel has always been a problem. In this study, differences between the existing unstable crack propagation calculation models were analysed, and the deficiencies within the crack propagation velocity models were overcome. The hardening coefficient and hardening index of the ductile material were considered, and a velocity model of unstable crack propagation of pipelines based on the Hutchinson‐Rice‐Rosengren (HRR) theory elastic‐plastic stress‐strain field and the displacement field was established. Consequently, the limit propagation velocity was obtained. In full‐scale burst test, the pipe with diameter of 1422 mm was chosen to simulate the natural gas pipeline transportation environment. Compared with the theoretical result, the error was limited in 13%. The research result solved the problem of quantifying the propagation velocity of the crack in X80 pipeline, which was significant for describing the forecast of velocity and length of unstable propagation and failure characteristics of pipelines.

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“…Comparing Equation with the crack propagation velocity of brittle materials

V = 0.38 \sqrt{\frac{E}{ρ}} ((), 1 - \frac{a_{normalc}}{a})

Section: Crack Propagation Velocity Of Pipeline Ductile Hardening Matmentioning

confidence: 98%

Experimental study of unstable crack propagation velocity for X80 pipeline steel

Dong

Zhang

et al. 2018

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…Two main causes of structural damage that could induce pipeline failure are: mechanical interference and corrosion. It has been estimated that the failure of oil and gas transmission pipelines resulting from mechanical damage ranges from 55% in the USA to around 70% in Europe (Ghaednia et al 2015b). Dents, gouges, cracks, corrosion and combinations thereof are commonly found on pipelines.…”

Section: Introductionmentioning

confidence: 99%

“…They might be caused by abnormal or accidental events including dropped objects, dragging anchors, fishing equipment, sinking vessels, mudslides and harsh environments such as extreme waves and currents (Bjørnøy et al 2000;DNV 2010;Abeele et al 2013;Ghaednia et al 2015b). Under these circumstances, prediction of the strength of a pipeline is a subject that has attracted the attention of many researchers such as Dyau and Kyriakides (1993), Lancaster and Palmer (1996a) (1996), Estekanchi and Vafai (1999), Bjørnøy et al (2000), Bruschi et al (2005), Vitali et al (2005), Vaziri and Estekanchi (2006), Bartolini et al (2014), Ghaednia et al (2015a), Ghaednia et al (2015b) and Rajabipour and Melchers (2015). Relevant research can not only clarify the inner mechanism of the pipeline structure failure, but also facilitates the decision-making in engineering practice when pipelines undergo structural damage.…”

Section: Introductionmentioning

confidence: 99%

Residual ultimate strength of offshore metallic pipelines with structural damage – a literature review

Cai

Jiang

Lodewijks

2017

Ships and Offshore Structures

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The latest research progress on residual ultimate strength of metallic pipelines with structural damage is presented through literature survey. The investigated pipe diameter-to-thickness ratios majorly lie between 20 and 50, which are typically applicable in deep water. Influential parameters in terms of pipe load, installation process and material that affect the ultimate strength of pipes are categorised. Structural damage including dent, metal loss and crack is identified and efforts are made to summarise critical damage factors such as dent length and crack depth. Furthermore, research and prediction methods on pipe residual ultimate strength in terms of experimental tests, numerical simulations and analytical predictions are summarised and discussed. Specific details on how to introduce, simplify and simulate structural damage are presented and discussed. It is expected that the mechanism of residual ultimate strength of metallic pipes with structural damage can be clarified through this study so that guidance will be provided for researchers in this field.

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“…A lot of dents have been found in the pipeline due to the construction of mechanical damage. Dents can deform the pipeline and affect the integrity of body for the pipeline [3][4][5][6]. Specifically, the dent located in the weld of pipeline or the dent that is very sharp can lead to the serious leak consequence.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Calculation of Dent Based on Pipeline Bending Strain

Feng

Zhang

2016

Journal of Sensors

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The bending strain of long-distance oil and gas pipelines can be calculated by the in-line inspection tool which used inertial measurement unit (IMU). The bending strain is used to evaluate the strain and displacement of the pipeline. During the bending strain inspection, the dent existing in the pipeline can affect the bending strain data as well. This paper presents a novel method to model and calculate the pipeline dent based on the bending strain. The technique takes inertial mapping data from in-line inspection and calculates depth of dent in the pipeline using Bayesian statistical theory and neural network. To verify accuracy of the proposed method, an in-line inspection tool is used to inspect pipeline to gather data. The calculation of dent shows the method is accurate for the dent, and the mean relative error is 2.44%. The new method provides not only strain of the pipeline dent but also the depth of dent. It is more benefit for integrity management of pipeline for the safety of the pipeline.

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Safe burst strength of a pipeline with dent–crack defect: Effect of crack depth and operating pressure

Cited by 40 publications

References 19 publications

Experimental study of unstable crack propagation velocity for X80 pipeline steel

Experimental study of unstable crack propagation velocity for X80 pipeline steel

Residual ultimate strength of offshore metallic pipelines with structural damage – a literature review

Modeling and Calculation of Dent Based on Pipeline Bending Strain

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