Flotation to Trigger Lateral Buckles in Pipelines on a Flat Seabed

Peek, Ralf; Yun, Heedo

doi:10.1061/(asce)0733-9399(2007)133:4(442)

Cited by 40 publications

(14 citation statements)

References 6 publications

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“…Figure 3b demonstrates the changes in temperature at positions x/L = 0, 0.5, and 1 with the interval of 25 computational increments throughout the entire heating-up analysis. For modelling of the pipe-soil interaction, the general contact algorithm obeying the Coulomb friction law is used to specify the pipe-soil interface [26][27][28][31][32][33][34][35][36]. To represent a gain in axial soil friction due to the consolidation hardening effect during the intermittent operation and maintenance phases, the equivalent frictional coefficient µ described in Figure 1b is used.…”

Section: Model Descriptionmentioning

confidence: 99%

Effect of Gain in Soil Friction on the Walking Rate of Subsea Pipelines

Zhang

Liu

et al. 2019

JMSE

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Subsea pipelines are commonly employed in the offshore oil and gas industry to transport high-pressure and high-temperature (HPHT) hydrocarbons. The phenomenon of pipeline walking is a topic that has drawn a great deal of attention, and is related to the on-bottom stability of the pipeline, such as directional accumulation with respect to axial movement, which can threaten the security of the entire pipeline system. An accurate assessment of pipeline walking is therefore necessary for offshore pipeline design. This paper reports a comprehensive suite of numerical analyses investigating the performance of pipeline walking, with a focus on the effect of increasing axial soil resistance on walking rates. Three walking-driven modes (steel catenary riser (SCR) tension, downslope, and thermal transient) are considered, covering a wide range of influential parameters. The variation in walking rate with respect to the effect of increased soil friction is well reflected in the development of the effective axial force (EAF) profile. A method based on the previous analytical solution is proposed for predicting the accumulated walking rates throughout the entire service life, where the concept of equivalent soil friction is adopted.

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Section: Model Descriptionmentioning

confidence: 99%

Effect of Gain in Soil Friction on the Walking Rate of Subsea Pipelines

Zhang

Liu

et al. 2019

JMSE

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“…The second is the numerical simulation on the buckling of the submarine pipelines. Commercial software such as ABAQUS has been widely used to analyze the buckling of the submarine pipelines [9,10]. Because of the inevitable model simplification in both of the theoretical analysis and numerical simulation, the experimental work is necessary to support and verify the theoretical and numerical simulation results.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation on Upheaval Buckling of Free-Span Submarine Pipeline

2019

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Submarine pipeline is widely used for the transportation of oil and gas in offshore exploration and production. The free span of pipeline is inevitable because of the complex seabed conditions, which may result in the upheaval buckling failure under the service conditions. In this paper, several experimental tests on scale models of submarine pipelines was carried out. The test results show that the length of the free span is closely related with the buckling of the pipeline. The upheaval buckling of pipelines is induced by the high compressive stress due to thermal action and triggered by the initial curvature due to self-weight. Thus, the traditional analysis and design method with effective length method cannot be used. Based on the experimental results, a simple and effective finite element model is developed and verified for parametric study. The numerical simulation results show that the diameter, length of free span and the self-weight of the pipeline will influence the buckling resistance of the pipeline system. The proposed finite element model can be used for the practical design of submarine pipelines.

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“…Three methods are commonly adopted to promote the reliable formation of lateral buckles and to control the buckle spacing and operating loads, which are snake-lay, sleeper and local weight reduction through distributed buoyancy [6]. A method related to distributed buoyancy is to use discrete buoyancy, such as buoyancy bags, to aid buckle initiation [3,7,8] .…”

Section: Introductionmentioning

confidence: 99%

Analytical study of lateral thermal buckling for subsea pipelines with sleeper

Wang

Tang

Heijden

2018

Thin-Walled Structures

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Unburied subsea pipelines operating under high-temperature and high-pressure conditions tend to relieve their axial compressive force by forming lateral buckles. Uncontrolled lateral buckling may lead to pipeline failure. In order to control lateral buckling, a sleeper is often employed as a buckle-initiation technique. In this study, analytical solutions of lateral buckling for unburied subsea pipelines with sleeper are derived. An energy analysis is employed to investigate the stability of the buckled pipeline. The influence of sleeper height and sleeper friction on pipeline buckled configurations and typical lateral buckling behaviour is illustrated and analysed. The results are shown to be in very good agreement with experimental data in the literature. We also discuss the effect of imperfections and conduct an error analysis of one of the main assumptions of the proposed analytical method. Our results show that increasing the height of the sleeper or decreasing the friction between pipeline and sleeper can all be used to decrease the minimum critical temperature difference. However, only the sleeper height is effective in substantially reducing the maximum compressive stress.

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Flotation to Trigger Lateral Buckles in Pipelines on a Flat Seabed

Cited by 40 publications

References 6 publications

Effect of Gain in Soil Friction on the Walking Rate of Subsea Pipelines

Effect of Gain in Soil Friction on the Walking Rate of Subsea Pipelines

Experimental and Numerical Investigation on Upheaval Buckling of Free-Span Submarine Pipeline

Analytical study of lateral thermal buckling for subsea pipelines with sleeper

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