Assessing mechanical damage in offshore pipelines – Two case studies

Macdonald, Kenneth A.; Cosham, Andrew; Alexander, Chris; Hopkins, P.

doi:10.1016/j.engfailanal.2006.11.074

Cited by 62 publications

(15 citation statements)

References 3 publications

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“…This observation is based on several studies of the significance of plain dents; the results of the full scale burst tests confirm the high burst strength of plain dents [9], [11], [20], [21]. The results of over 75 burst tests of unconstrained plain dents have been published (dating from 1958 to 2000), but failure in the dented area only occurred in four tests (the remainder of the tests were terminated prior to failure) Note that in all of the full scale tests on plain dents, the dent depths were measured at zero pressure after spring back.…”

Section: = ∆supporting

confidence: 62%

“…The large stresses and strains introduced by the dent are accommodated by the ductility of the pipe. Deep dents tend to fail either because they are unable to reround or because of wall thinning in the dented area (in tests, outward bulging has been observed in dented areas that have rerounded [21]). The limited number of burst tests on constrained dents indicates that they have burst strength at least that of an equivalent unconstrained dent, unless the indenter is sharp [11].There are no published analytical methods for assessing the burst strength of a plain dent; rather, the results of full scale tests have been used to derive empirical limits for the acceptability of plain dents.…”

Section: = ∆mentioning

confidence: 99%

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The Effect of Dent Under Fatigue Loading in Pressurized Pipeline: A Review

2015

IJAERD

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Section: = ∆supporting

confidence: 62%

Section: = ∆mentioning

confidence: 99%

The Effect of Dent Under Fatigue Loading in Pressurized Pipeline: A Review

2015

IJAERD

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“…The extent of the fatigue lifetime change depends on the type of the dent, and it can be analyzed and assessed analytically or numerically (FEM) [14]. Fatigue life analysis helps in the decision on the necessity of repairs and/or replacement of the damaged pipelines, i.e., planning of inspection and maintenance activities.…”

Section: Ofshore Structural Failurementioning

confidence: 99%

Common Case Studies of Marine Structural Failures

Vukelić¹,

Vizentin²

2017

Failure Analysis and Prevention

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Marine structures are designed with a requirement to have reasonably long and safe operational life with a risk of catastrophic failures reduced to the minimum. Still, in a constant wish for reduced weight structures that can withstand increased loads, failures occur due to one or several following causes: excessive force and/or temperature induced elastic deformation, yielding, fatigue, corrosion, creep, etc. Therefore, it is important to identify threats afecting the integrity of marine structures. In order to understand the causes of failures, structure's load response, failure process, possible consequences and methods to cope with and prevent failures, probably the most suitable way would be reviewing case studies of common failures. Roughly, marine structural failures can be divided into structural failures of ships, propulsion system failures, ofshore structural failure, and marine equipment failures. This book chapter will provide an overview of such failures taking into account failure mechanisms, tools used for failure analysis and critical review of possible improvements in failure analysis techniques.

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“…The fast moving soil would present a great risk to the submarine pipeline with a long route length (Nadim and Locat, 2005;Bruschi et al, 2006;Parker et al, 2008). So with the offshore oil and gas development shifting gradually to the deep-water continental slope area, the mass movement impact of the submarine landslide on the submarine pipeline has been paid more and more attentions, compared with the traditional failure models (Macdonald et al, 2007;Yang et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Runout prediction and dynamic characteristic analysis of a potential submarine landslide in Liwan 3-1 gas field

et al. 2015

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A large number of submarine landslides with different scales have been identified in the canyon area of the submarine pipeline route of Liwan 3-1 gas field. There is still much chance that submarine slope failures would happen, and the following mass movement would present great risk to the submarine pipeline. In view of this, a numerical prediction method based on Eulerian-Eulerian two-phase flow model is introduced to simulate the mass movement of potential submarine landslides. The sliding soil and ambient water are respectively simulated by Herschel-Bulkley rheology model and Newtonian fluid model. The turbulence is simulated using the k-e model. Compared with both the experiment data and Bing result, the two-phase flow model shows a good accuracy, and its result is more close to the actual situation; the dynamic coupling between soil and ambient water can be effectively simulated and the phenomena of hydroplaning and head detachment can be obtained. Finally, the soil movement of a potential submarine landslide is simulated as an example, according to the seismic profile in the canyon area. The result shows that the hydroplaning occurs during the movement process. The runout distance calculated by the two-phase flow model is 877 m, which is 27.1% larger than the Bing result. However, the peak front velocity of soil is relative small, with a maximum value of 8.32 m/s. The Bing program with a simple and rapid process can be used for a preliminary evaluation, while the two-phase flow model is more appropriate for an accurate assessment. . 2015. Runout prediction and dynamic characteristic analysis of a potential submarine landslide in Liwan 3-1 gas field. Acta Oceanologica Sinica, 34 (7): 116-122,

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Assessing mechanical damage in offshore pipelines – Two case studies

Cited by 62 publications

References 3 publications

The Effect of Dent Under Fatigue Loading in Pressurized Pipeline: A Review

The Effect of Dent Under Fatigue Loading in Pressurized Pipeline: A Review

Common Case Studies of Marine Structural Failures

Runout prediction and dynamic characteristic analysis of a potential submarine landslide in Liwan 3-1 gas field

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