Bibliografie tematiche / Submarine Pipeline

Letteratura scientifica selezionata sul tema "Submarine Pipeline"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 21 febbraio 2023

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Articoli di riviste sul tema "Submarine Pipeline"

1

Geng, Hui Hui, e Jun Yang Wu. "The Effect of Submarine Pipelines’ Distortion when Original Parameters Are Changed during Laying". Applied Mechanics and Materials 204-208 (ottobre 2012): 1082–88. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.1082.

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Abstract (sommario):
The mechanics model about submarine pipelines during installation is based on the theory of geometrical nonlinear great distortion. The U.L method is adopted as solving problem about the contact between submarine pipeline and seabed, the results obtained by this method are equally accurate and less computational work is need when solving pipeline’s non-linear great distortion. According to select different original parameter during laying pipeline, the bend distortion to submarine pipeline is calculated and the effect of bend distortion to submarine pipeline is analyzed.
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2

Shao, Bing, Xiang Zhen Yan e Xiu Juan Yang. "Reliability Analysis of Locally Thinned Submarine Pipelines in ChengDao Oil Field". Applied Mechanics and Materials 94-96 (settembre 2011): 1527–30. http://dx.doi.org/10.4028/www.scientific.net/amm.94-96.1527.

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Abstract (sommario):
Local thinning of submarine pipeline always exists due to the complexity and dynamic of marine environment loads. However, the location and extent of thinning areas are random. Mechanical research on the randomness of local thinning of submarine pipelines is significant for pipeline’s stress analysis and failure evaluation. In this paper, finite element model of locally thinned submarine pipeline is established and based on the Monte-Carlo method, the effect of input random variables on the submarine pipeline’s reliability is analyzed. Probability distribution ranges of equivalent stresses are got and further, relationship equation between confidence level and stress limit has been obtained. The result more accurately reveals the relationships of locally thinned pipeline and its elastic modulus with equivalent stress, which can provide foundation for safety analysis of locally thinned submarine pipeline with internal pressure.
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3

Wood, G. D. "Pipeline Incidents and Emergency Repair in the North Sea". Journal of Energy Resources Technology 110, n. 4 (1 dicembre 1988): 219–23. http://dx.doi.org/10.1115/1.3231385.

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Abstract (sommario):
The failures of submarine pipelines in the North Sea, and the response of pipeline operators are first discussed. Against this background, the methods currently available for submarine pipeline repairs are reviewed. The Emergency Pipeline Repair Services available are described, and some future developments in the field of submarine pipeline repair are briefly outlined.
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4

Yan, Yi Fei, e Lu Feng Cheng. "The Finite Element Analysis on the Submarine Pipeline under the Seismic Loading". Advanced Materials Research 490-495 (marzo 2012): 2977–81. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.2977.

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Abstract (sommario):
Seismic loading is one of the most important factors of submarine pipeline damage, so the research on submarine pipeline failure mechanism is still lifeline engineering frontier topics. According to Biot consolidation theory, considering the interaction of submarine pipelines with the soil medium under earthquake action, the model of the seabed-pipeline interaction is established. The influences of wall thickness, radius and cover layer thickness on submarine pipeline strain response are studied under El Centro seismic wave based on this model. The calculating results show that effective stress and axial strain of the submarine pipeline increases with wall thickness, radius and cover layer thickness increasing.
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5

Su, Wenxian, e Jie Ren. "Numerical Simulation of Local Buckling of Submarine Pipelines under Combined Loading Conditions". Materials 15, n. 18 (14 settembre 2022): 6387. http://dx.doi.org/10.3390/ma15186387.

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Abstract (sommario):
Submarine pipelines are prone to developing flaws, such as ellipticity and depression during the manufacture, burying, and use processes. The local buckling characteristics of submarine pipelines with initial imperfection must be studied since the initial imperfection have an impact on local pipeline buckling. In this study, the local buckling of submarine pipelines with varying depression depths and ellipticity is simulated using the finite element program ABAQUS, and defect sensitivity of submarine pipelines with varying shape ellipticity, varying depression depths, and varying pipe radius-thickness ratios is examined. Meanwhile, research is being conducted on the combined load buckling of a submarine pipeline with initial imperfection caused by bending, axial force, and external hydrostatic pressure. The results indicated that the critical external pressure of the pipeline is sensitive to the imperfection, although the buckling propagation pressure is not. The buckling morphology is influenced by the shape and size of the imperfection. Additionally, the ability to withstand external hydrostatic pressure of the pipeline reduces after it has been bent.
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6

Mordvintsev, Konstantine P., Alexander G. Gogin e Ekaterina M. Korneeva. "Submarine pipeline stability under currents and waves action". RUDN Journal of Engineering Researches 22, n. 1 (27 agosto 2021): 113–21. http://dx.doi.org/10.22363/2312-8143-2021-22-1-113-121.

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Abstract (sommario):
Pipelines are widely used in recent decades because their eco-friendliness, safety and profitability of transportation. Their length can be more than hundreds and thousands of kilometers. Submarine pipelines got wide distribution. Their constructing must comply with regulatory documents. But even it cant guarantee no problems during operation. This study contains review of the different research, connected with floating of a submarine pipeline problem. Information about conducted research and their conclusions is summarized in this paper. Direction for the future investigations is shown. Submarine pipelines are subjected to vertical movement (floating). Pipeline ballasting method is used to avoid this situation. Ballasting by loading bags is considered in this article. This study contains review of the different research, connected with floating of a submarine pipeline problem. Calculations required for the correct selection of the loading bags weight are performed, possible reasons for floating are described. This article will be useful for submarine pipeline designers.
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7

Zhang, Yan, Jianhong Ye, Kunpeng He e Songgui Chen. "Seismic Dynamics of Pipeline Buried in Dense Seabed Foundation". Journal of Marine Science and Engineering 7, n. 6 (20 giugno 2019): 190. http://dx.doi.org/10.3390/jmse7060190.

Testo completo
Abstract (sommario):
Submarine pipeline is a type of important infrastructure in petroleum industry used for transporting crude oil or natural gas. However, submarine pipelines constructed in high seismic intensity zones are vulnerable of attacks from seismic waves. It is important and meaningful in engineering design to comprehensively understand the seismic wave-induced dynamics characteristics of submarine pipelines. In this study, taking the coupled numerical model FSSI-CAS 2D as the tool, the seismic dynamics of a submarine steel pipeline buried in dense soil is investigated. Computational results indicate that submarine pipeline buried in dense seabed soil strongly responds to seismic wave. The peak acceleration could be double of that of input seismic wave. There is no residual pore pressure in the dense seabed. Significant resonance of the pipeline is observed in horizontal direction. Comparative study shows that the lateral boundary condition which can avoid wave reflection on it, such as laminar boundary and absorbing boundary should be used for seabed foundation domain in computation. Finally, it is proven that the coupled numerical model FSSI-CAS 2D is applicable to evaluate the seismic dynamics of submarine pipeline.
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8

Hu, Yanhua, Yukun Wang, Pengyu Jia, Jianyu Lv e Mingchao Wang. "Research on Development and Test Analysis of Full-Scale Fatigue Test System of X65 Submarine Pipeline". E3S Web of Conferences 253 (2021): 01055. http://dx.doi.org/10.1051/e3sconf/202125301055.

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Abstract (sommario):
The fatigue performance of welded joints of submarine pipelines is directly related to the safety and economic benefits of welded structures. Considering the limitations of fatigue calculation, anti-fatigue design and small-scale fatigue test in the evaluation and analysis of pipeline fatigue life, this paper demonstrated the feasibility, scientificity and advancement of submarine pipeline full-scale fatigue test technology in engineering applications. Consequently, a full-scale fatigue test system and its test analysis technology applied for ZY-PFS2000 pipelines have been first developed in China, in which the effects of welding residual stress, stress concentration, initial welding defects, pipeline internal pressure shutdown and internal medium fluctuations on the fatigue life of full-scale pipelines were comprehensively taken into account. Through the full-scale fatigue test (four-point bending + internal pressure) of the X65 submarine pipeline, the fatigue cycles of different specifications of pipelines under different stress amplitudes were obtained. Moreover, the fatigue loading results were evaluated and analyzed in accordance with the international standard of BS 7608 and DNV C203. The research in this paper is conducive to accumulating full-scale fatigue performance data for submarine pipelines in China, not only offering a quantitative basis for the subsequent full-scale fatigue life evaluation and the safety operation cycle, but also providing a reference direction for the future development of submarine pipeline full-scale fatigue test technology.
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9

Zhang, Bo, Rui Gong, Tao Wang e Zhuo Wang. "Causes and Treatment Measures of Submarine Pipeline Free-Spanning". Journal of Marine Science and Engineering 8, n. 5 (8 maggio 2020): 329. http://dx.doi.org/10.3390/jmse8050329.

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Abstract (sommario):
Submarine pipelines, as arteries for offshore oil and gas transportation, play a particularly important role in the exploitation of offshore oil and gas resources. Since the world’s first submarine pipelines were laid in the Gulf of Mexico, numerous failures have been caused by pipeline free-spanning. This paper provides a review of the causes and treatment measures for the free span of submarine pipeline. Various factors cause the free span of submarine pipelines, including wave flow scouring, fluctuations in seabed topography, residual stress or thermal stress of pipelines, and human activities. The scour of the wave current is the main factor affecting free span; the research on sediment starting and equilibrium depth during scour is reviewed in-depth. For the span treatment of submarine pipelines, the main measures available at present include the re-digging trench burying, structural support, covering bionic water plants, and choke plate self-burying. For each, the principle, advantages, disadvantages, and research are discussed. This review provides a convenient resource for understanding the causes of submarine free-spanning pipelines and choosing suitable treatment measures.
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10

Peng, Deping, Buyan Wan, Yongping Jin, Likun Han, Jia Chen e Hongkun Liu. "The JCOE/JCOC manufacturing process and collapse resistance of submarine pipeline". Advances in Mechanical Engineering 15, n. 1 (gennaio 2023): 168781322211431. http://dx.doi.org/10.1177/16878132221143186.

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Abstract (sommario):
Submarine pipeline is an important part of deep-sea and ultra-deep-sea oil and gas development. In the cold forming process of longitudinal submerged arc welded (LSAW) pipe, the JCO manufacturing process is one of the key forming technologies for manufacturing submarine pipeline. The main problem encountered by submarine pipelines in offshore oil and gas transportation is insufficient pipeline collapse pressure, which leads to pipeline collapse and shortens the service life of the pipeline. Therefore, the analysis of the JCO manufacturing process is of great significance to improve the collapse resistance of pipelines. In this paper, the development and research status of the JCOE/JCOC manufacturing process are reviewed. The stress, contact, and deformation of the plate are symmetrical in the JCOE/JCOC manufacturing process. The effects of expanding and compression on pipe collapse performance in the JCO manufacturing process are summarized. The asymmetric factors can reduce the collapse performance of the pipeline. Compared with expanding, compression can effectively reduce the ovality of pipe and strengthen the compression performance of pipe, to improve the collapse performance of pipe; finally, the JCOE/JCOC manufacturing process and collapse resistance of submarine pipeline is summarized and prospected.
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Più fonti

Tesi sul tema "Submarine Pipeline"

1

Kok, Nicolaas Johannes. "Lift and drag forces on a submarine pipeline in steady flow". Doctoral thesis, University of Cape Town, 1988. http://hdl.handle.net/11427/8315.

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Abstract (sommario):
Includes bibliography.
This thesis describes an experimental investigation into the hydrodynamic forces induced on a cylinder placed transversely to a steady stream. Various cylinder locations near the bed of a water flume were considered. The work relates to pipeline design. The various flow phenomena around a cylinder are theoretically analysed and an explanation of the phenomenon of lift provided. A thorough literature review was undertaken regarding the classical theory, as well as experimental and theoretical studies carried out on the subject. This revealed that theoretical studies are virtually non-existent. Measurements have been done in intermediate water depths with both smooth and rough beds. Two different methods, comprising very simple yet novel techniques, were utilised in a water flume 18 m long x 600 mm wide x 450 mm deep. The methods involved a unique pressure determination method as well as the direct measurement of hydrodynamic forces, using a "weighing" method. Very ' accurate flow velocities were measured using a unique differential manometer. Experiments were performed in the Reynolds number range 6 000 to 26 000, using 30 and 50 mm diameter cylinders. comprehensive tests on cylinder roughening were carried out in a flow region which had not been well researched regarding this aspect. Cylinder locations were varied from a gap-to-cylinder diameter ratio of zero to 2,67. Results revealed that the force coefficients are not appreciably affected by bed roughness. Cylinder roughening produced somewhat contradicting results for the two different cylinders used. The influence on the lift coefficient was inconclusive, but the "rougher" 30 mm cylinder produced a slightly higher drag coefficient. Although the lift force was predominantly away from the bed, a downward lift force was measured on a few occasions with the cylinder situated further than one cylinder diameter away from the bed. A possible explanation is offered for this and other unexpected results. Flow visualisation tests were performed to confirm certain features of the flow around the cylinder. These as well as all the other results have been related to published work.
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2

Shabani, Behnam. "Wave-Associated Seabed Behaviour near Submarine Buried Pipelines". Thesis, The University of Sydney, 2008. http://hdl.handle.net/2123/3532.

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Abstract (sommario):
Soil surrounding a submarine buried pipeline consolidates as ocean waves propagate over the seabed surface. Conventional models for the analysis of soil behaviour near the pipeline assume a two-dimensional interaction problem between waves, the seabed soil, and the structure. In other words, it is often considered that water waves travel normal to the orientation of pipeline. However, the real ocean environment is three-dimensional and waves approach the structure from various directions. It is therefore the key objective of the present research to study the seabed behaviour in the vicinity of marine pipelines from a three-dimensional point of view. A three-dimensional numerical model is developed based on the Finite Element Method to analyse the so-called momentary behaviour of soil under the wave loading. In this model, the pipeline is assumed to be rigid and anchored within a rigid impervious trench. A non-slip condition is considered to exist between the pipe and the surrounding soil. Quasi-static soil consolidation equations are then solved with the aid of the proposed FE model. In this analysis, the seabed behaviour is assumed to be linear elastic with the soil strains remaining small. The influence of wave obliquity on seabed responses, i.e. the pore pressure and soil stresses, are then studied. It is revealed that three-dimensional characteristics systematically affect the distribution of soil response around the circumference of the underwater pipeline. Numerical results suggest that the effect of wave obliquity on soil responses can be explained through the following two mechanisms: (i) geometry-based three-dimensional influences, and (ii) the formation of inversion nodes. Further, a parametric study is carried out to investigate the influence of soil, wave and pipeline properties on wave-associated pore pressure as well as principal effective and shear stresses within the porous bed, with the aid of proposed three-dimensional model. There is strong evidence in the literature that the failure of marine pipelines often stems from the instability of seabed soil close to this structure, rather than from construction deficiencies. The wave-induced seabed instability is either associated with the soil shear failure or the seabed liquefaction. Therefore, the developed three-dimensional FE model is used in this thesis to further investigate the instability of seabed soil in the presence of a pipeline. The widely-accepted criterion, which links the soil liquefaction to the wave-induced excess pressure is used herein to justify the seabed liquefaction. It should be pointed out that although the present analysis is only concerned with the momentary liquefaction of seabed soil, this study forms the basis for the three-dimensional analysis of liquefaction due to the residual mechanisms. The latter can be an important subject for future investigations. At the same time, a new concept is developed in this thesis to apply the dynamic component of soil stress angle to address the phenomenon of wave-associated soil shear failure. At this point, the influence of three-dimensionality on the potentials for seabed liquefaction and shear failure around the pipeline is investigated. Numerical simulations reveal that the wave obliquity may not notably affect the risk of liquefaction near the underwater pipeline. But, it significantly influences the potential for soil shear failure. Finally, the thesis proceeds to a parametric study on effects of wave, soil and pipeline characteristics on excess pore pressure and stress angle in the vicinity of the structure.
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3

Shabani, Behnam. "Wave-Associated Seabed Behaviour near Submarine Buried Pipelines". University of Sydney, 2008. http://hdl.handle.net/2123/3532.

Testo completo
Abstract (sommario):
Master of Engineering (Research)
Soil surrounding a submarine buried pipeline consolidates as ocean waves propagate over the seabed surface. Conventional models for the analysis of soil behaviour near the pipeline assume a two-dimensional interaction problem between waves, the seabed soil, and the structure. In other words, it is often considered that water waves travel normal to the orientation of pipeline. However, the real ocean environment is three-dimensional and waves approach the structure from various directions. It is therefore the key objective of the present research to study the seabed behaviour in the vicinity of marine pipelines from a three-dimensional point of view. A three-dimensional numerical model is developed based on the Finite Element Method to analyse the so-called momentary behaviour of soil under the wave loading. In this model, the pipeline is assumed to be rigid and anchored within a rigid impervious trench. A non-slip condition is considered to exist between the pipe and the surrounding soil. Quasi-static soil consolidation equations are then solved with the aid of the proposed FE model. In this analysis, the seabed behaviour is assumed to be linear elastic with the soil strains remaining small. The influence of wave obliquity on seabed responses, i.e. the pore pressure and soil stresses, are then studied. It is revealed that three-dimensional characteristics systematically affect the distribution of soil response around the circumference of the underwater pipeline. Numerical results suggest that the effect of wave obliquity on soil responses can be explained through the following two mechanisms: (i) geometry-based three-dimensional influences, and (ii) the formation of inversion nodes. Further, a parametric study is carried out to investigate the influence of soil, wave and pipeline properties on wave-associated pore pressure as well as principal effective and shear stresses within the porous bed, with the aid of proposed three-dimensional model. There is strong evidence in the literature that the failure of marine pipelines often stems from the instability of seabed soil close to this structure, rather than from construction deficiencies. The wave-induced seabed instability is either associated with the soil shear failure or the seabed liquefaction. Therefore, the developed three-dimensional FE model is used in this thesis to further investigate the instability of seabed soil in the presence of a pipeline. The widely-accepted criterion, which links the soil liquefaction to the wave-induced excess pressure is used herein to justify the seabed liquefaction. It should be pointed out that although the present analysis is only concerned with the momentary liquefaction of seabed soil, this study forms the basis for the three-dimensional analysis of liquefaction due to the residual mechanisms. The latter can be an important subject for future investigations. At the same time, a new concept is developed in this thesis to apply the dynamic component of soil stress angle to address the phenomenon of wave-associated soil shear failure. At this point, the influence of three-dimensionality on the potentials for seabed liquefaction and shear failure around the pipeline is investigated. Numerical simulations reveal that the wave obliquity may not notably affect the risk of liquefaction near the underwater pipeline. But, it significantly influences the potential for soil shear failure. Finally, the thesis proceeds to a parametric study on effects of wave, soil and pipeline characteristics on excess pore pressure and stress angle in the vicinity of the structure.
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4

SILVA, BARBARA AZEVEDO DA. "SLOPE STABILITY ANALYSIS ALONG A SUBMARINE PIPELINE`S ROUTE AT CAMPOS BASIN, RJ". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2005. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=7336@1.

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Abstract (sommario):
PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
Neste trabalho são avaliadas as condições de estabilidade do subsolo marinho ao longo da rota de um duto rígido de aço revestido com concreto, de 10 de diâmetro, localizado na Bacia de Campos, RJ. Os dados geológicos e geotécnicos foram adquiridos a partir de um amplo levantamento geofísico e geotécnico realizado na diretriz do duto. Devido as adversidades à estabilidade do fundo marinho, várias análises vêm sendo realizadas de forma qualitativa e quantitativa. Atualmente, por questões ambientais e de segurança de obras de engenharia, busca-se uma avaliação mais quantitativa dos riscos geológicos associados à condição de estabilidade do fundo marinho, pois os escorregamentos de taludes representam o principal risco para estas estruturas. As análises de estabilidade foram feitas a partir da teoria do talude infinito, em metodologia aplicada por Nowacki et al. (2003) nos campos profundos de Mad Dog e Atlantis, no Golfo do México, e comparadas com os resultados encontrados a partir da formulação clássica do talude infinito. Uma integração de dados geotécnicos e geofísicos foi necessária, para que todos os parâmetros utilizados na metodologia pudessem ser obtidos. Os resultados indicaram dois pontos críticos ao longo da rota, ambos associados aos flancos do cânion Itapemirim, que apresentam gradientes altos. Foram realizados breves estudos com o objetivo de se avaliar a possibilidade de ocorrência de mecanismos disparadores (terremotos e ondas de tempestade) nesses pontos críticos mas os resultados descartaram esta possibilidade. Concluiu- se ainda que os dados geotécnicos utilizados neste trabalho não foram suficientes e de certo modo não apropriados para a análise de estabilidade de taludes. Uma nova campanha de ensaios geotécnicos de laboratório foi proposta para futuros estudos.
This research analyses stability conditions of marine sediments superficial layers of along a 10 in. diameter pipeline`s route, located at Campos Basin, RJ. The geological and geotechnical data were obtained during a wide geophysical and geotechnical survey along the pipeline`s route. Due to adversities to botton stability found in the marine environment, several qualitative and quantitative stability analysis have been made. Nowadays, because of environmental and safety issues, the researches are more focused on quantitative analysis of geohazards associated with the stability condition of the sea bottom, since slope slides represent the main risk for those structures. The stability analyses were based on the infinite slope theory. The methodology applied was the same used by Nowacki et al. (2003) at the deep fields of Mad Dog and Atlantis, in the Gulf of Mexico. The results were compared with the results from the classical formulation of the infinite slope. An integration of geotechnical and geophysical data was necessary, in order to obtain all the parameters used in the methodology. The results indicated two critical points along the route, both associated with the flanks of the Itapemirim Canyon, which have steep slopes. Brief studies were made to evaluate the importance of triggering mechanisms (earthquakes and storm waves) at these critical points but the results discard this possibility. It was also concluded that the geotechnical data used in this research were insufficient and in a certain way not appropriate for the slope stability analysis. A new geotechnical lab tests campaign was proposed for future studies.
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5

Oliver, Kerry Derrick. "The response of a soil backed submarine pipeline impacted by a dropped object". Thesis, University of Aberdeen, 1999. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU603188.

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Abstract (sommario):
The impact of a pipeline by a dropped object has been considered to consist of four distinct impact components: the dropped object, pipeline protection, the soil bed and the pipeline itself. The effect of these components as energy absorbers and the effect on system response has been investigated. Quasi-static and dynamic testing has been earned out to investigate the interaction between the various impact components. Quasi-static testing has been widely used to develop initial predictions, since closer observation of interaction is easier. The validity of applying these predictions to dynamic situations has been addressed using results from dynamic impact testing. The Dropped Object: Two areas have been investigated which address the dropped object within the impact system: the dropped object's impact profile and its deformability. Testing has been carried out to study the effect of typical loading profiles. Research has shown that the dropped object profile significantly effects the pipe response; a cone shaped indentor generates deformation with far less energy than either a wedge or a patch shape. The applicability of a method to predict the interaction between two deforming structures, using a method of shared energy, has been investigated for quasi-static and dynamic loading. During quasi-static testing it was found possible to predict a combined response using individual responses. During dynamic testing prediction was not possible, since inertia effects where found to dominate the response. The Concrete Protective Coating: A programme of work carried out has qualified the role of a pipeline protective coating and assessed the effect of four different types of concrete reinforcement. Summary Although the study has not been exhaustive, it is clear that reinforcements, which hold the concrete coating to the pipe, allow the coating to continue its protection. Fibres added to a concrete mix were found to reduce the damage to the pipe. However mesh reinforcements were found to hold the concrete together most effectively and provided the greatest added protection. The Soil Support: All foundations absorb some energy. Tests have been carried out to investigate the effect of a soil bed on the response of a laterally loaded pipeline. During dynamic tests on sand supported pipes it was noted that no energy was absorbed during the initial deformation, possibly corresponding to local indentation of the pipe wall. After this the sand was seen to react and absorbed a proportion of the energy, depending on the hammer's drop height. The energy absorbed by the soil continued to increase until an energy plateau was reached, after which the soil absorbed no further energy. It was noted that the displacement at which this energy plateau was reached increased as the drop height increased. Two possible causes of the energy plateau have been discussed. The first cause questioned an assumption that the pipe would deform as if on simple supports. The second possible cause suggested a change from dynamic to quasi-static response and investigated the relationship between acceleration, velocity and reaction force. Of the possible causes of the energy plateau, the most likely is thought to be soil related. Investigation into the Deformation of Locally Loaded Pipes: The investigation into pipeline deformation has been carried out using experimental, numerical and theoretical analysis methods. Quasi-static test results have been used to investigate four pipeline parameters and their influence on energy absorbed by the pipeline, (length, L, wall thickness, t, diameter, D and material yield stress, ay). This investigation led to an empirical equation, which brought all energy-displacement (E-8) curves on to a common curve, for a wide range of these variables. This empirical relationship has been developed to predict deformation, for the range of parameters investigated. Dynamic results obtained were normalised using these empirical equations and data was seen to fall into two broad groups, one group comprising seam welded pipe and one group comprising cold drawn pipe. Strain rate effects were proposed as the most likely cause of this bi-grouping. Limitations in the experimentally derived empirical relationship have been identified, resulting from an insufficient range of pipe samples tested.
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6

Kamalarasa, Sanmugarasa. "Buckle propagation in submarine pipelines". Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.328779.

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7

Maschner, Emil Alexis. "Vertical buckling of heated submarine pipelines". Thesis, London South Bank University, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336365.

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8

Johnsen, Ingrid Berg. "Clump-weight trawl gear interaction with submarine pipelines". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-20673.

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Abstract (sommario):
Clump weights come in several shapes, with a mass generally between 2 to 9 tons [5]. With extensive oshore development in the last decades, vast networks of pipelines are installed on the sea bottom. With both pipeline extension and trawl equipment development in mind, the need for designing pipelines able to resist forces from trawl gear interaction have emerged. A recommended practice for pipeline design, DNV-RP-F111, was established by DNV. In this master thesis, a brief introduction to trawl gear and recommended practices are given. The main objective of the master thesis is to reproduce model tests numerically and analyse the response from clump weight over-trawling pipelines. Evidence is sought to establish and dierentiate between the importance of various parameters, e.g free span height, pipeline diameter, and pipe end conditions. Several sensitivity studies were performed, with alterations in several parameters, e.g warp line angle alteration and clump weight wobbling. A full scale pipeline model was also analysed, investigating eects of exibility in pipelines and comparing the results with design loads. All analyses are performed in SIMLA, a special purpose non-linear nite element program. A general description of non-linear nite element method is included in the report. All input values used to model the dierent cases are presented in the master thesis. A good correspondence linking model test results and reproduced simulated models were generally achieved, with some deviations. The deviations are primarily found for low free spans, indicating that this discrepancy can be reduced by further development of the numerical model, e.g by introducing friction to the model. For the full scale pipeline model, design loads are evidently higher than vii viii the pull over force from the corresponding full scale simulation. When comparing design loads with pull over forces from simulated experimental test models, they are more closely related. For small diameter pipelines, a simulation in a full scale model, compared to the rigid model simulations, reduce the pull over forces signicantly. Sensitivity simulations indicate a connection between free span height, pipeline diameter and pull over force. For high free spans, the simulated pull over force increase with decreasing pipe diameter. For low free spans, the simulated pull over force decrease when decreasing the pipe diameter. Clump weight wobbling have in the master thesis been shown to reduce the pull over force. This is seen in the sensitivity analyses performed. Changing clump weight geometry can lead to signicant changes in results. An alteration of the warp line bracket was performed, extending the bracket with 4 cm. The eect was an reduction in the pull over force by approximately 10%, in all cases. A change in warp line angle was also performed, by increasing and then decreasing the angle with 20%. The eect was an reduction in pull over force by 10% and an increase in pull over force by approximately 10%, respectively. For further details regarding the results, see chapter 5.
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9

Maalø, Kristian. "Clump-weight Trawl Gear Interaction with Submarine Pipelines". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-16216.

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A recent development in bottom trawling is the use of twin trawl equipment, where two trawl nets are towed side by side from a single vessel. This increases the catch rate and efficiently of the trawler. Governed by cost and catch optimization, the use of twin trawl systems are expected to become more popular in the future. Using two trawl nets will, in addition to trawl doors on each side, require a heavy clump weight in the middle to prevent the trawl nets lifting from the seabed. The largest clump weights can have a mass up to 9000 kg and can cause substantial load towed across subsea pipelines, and may in many cases be the governing design load with respect to external loads in pipeline design. The main objective in this thesis work was to simulate and investigate pull-over forces from clump weights on free spanning pipelines. All simulations were carried out in the computer software SIMLA. Six different small scale tests were simulated in order to verify the finite element model, a very good agreement was obtained. Design loads from trawl gear are generally implemented according to DNV-RP-F111. The calculation methods provided in this recommended practice are based on the same small scale tests which was made available to this thesis work for verification purposes. The validity range of DNV-RP-F111 reflects the range of the small scale tests i.e. only valid for rigid pipelines. The effect of increasing pipeline flexibility was investigated. Simulations were carried out for span heights 0.25m, 0.50m and 0.75m for a 12” pipeline. Two different pipeline models was applied, a 25 m rigid pipeline model with spring representing the lateral pipeline stiffness, and a 1000m pipeline model including realistic soil resistance. The major finding was that pull-over forces decrease for increasing pipeline flexibility. Compared to DNV-RP-F111 the obtained pull-over loads was found considerably lower, both in magnitude and duration. To avoid over-conservatism it is thus recommended that a design method accounting for pipeline flexibility should be developed and used in future pipeline designs. The effect of warp angle was simulated varying the warp line length from 2.5 to 3.5 times the water depth. The horizontal pull-over force was found to increase for increasing warp line length. Regarding clump weight design and towing configuration, simulations have shown that a forward clump weight center of gravity will reduce the pull-over loads. Applying a lower warp line attachment point resulted in a more uniform sliding motion of the clump weight during interference and pull-over loads was almost complete reduced to a case of initial impact. It is thus suggested that future clump weight design should reflect this to reduce interference loads on both trawl gear and subsea pipelines.
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OLIVEIRA, AIMEE EMANUEL CABRAL DE. "VIBRATION OF SUBMARINE PIPELINES SUPPORTED BY AN ELASTIC DISCONTINUOUS FOUNDATION". PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2016. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=29300@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE EXCELENCIA ACADEMICA
Diversos acidentes envolvendo dutos submarinos já aconteceram no Brasil como o do Gasoduto PCR-01/Lubnor e o da plataforma P-55 de 2,3 km no campo de Roncador, na Bacia de Campos. Esses acidentes ocorrem em muitos casos devido à flambagem, à fadiga, ao intenso processo corrosivo, à deficiência de projeto, a falta de manutenção dos mesmos. Os dutos submarinos representam uma alta porcentagem no custo total de uma unidade de extração de petróleo. Sua importância se torna vital para a extração de petróleo em águas territoriais brasileiras. Seu projeto estrutural é uma atividade que pode ser dividida em várias etapas que devem ser seguidas à risca para garantir a conformidade do mesmo com as normas nacionais e internacionais sua operação em um dos mais inóspitos cenários da natureza: o fundo do mar. Nesta situação, o duto fica sujeito a carregamentos extremos, tanto estáticos quanto dinâmicos. Por este motivo, ele é constituído de uma estrutura de camadas bastante complexa. O objetivo deste trabalho é a avaliação das condições de operação de dutos submarinos sujeitos à ação de ondas e correntes marinhas. Um estudo paramétrico em elementos finitos é realizado para compreender a influência das condições de contorno, diferentes comprimentos de vão livre do duto submarino e variações do tipo de solo na resposta dinâmica do duto submarino. È desenvolvida também uma solução analítica para o problema. As soluções numérica, analítica e as recomendações da norma são confrontadas e tiradas conclusões sobre os principais fatores a serem considerados pelos engenheiros envolvidos na construção de estruturas deste tipo.
Several accidents involving subsea pipelines have happened in Brazil as the pipeline PCR-01 / Lubnor and the P-55 platform 2.3 km in the Roncador field in the Campos Basin. These accidents occur in many cases due to buckling, fatigue, the intense corrosive process, design deficiency, lack of maintenance. The submarine pipelines represent a high percentage in the total cost of an oil extraction unit. Its importance becomes vital for the extraction of oil in Brazilian waters. Its structural design is an activity that can be divided into several steps that must be followed strictly to ensure its conformity with national and international standards operation in one of the harshest scenes of nature: the seabed. In this situation, the product is subject to extreme loads, both static and dynamic. For this reason, it consists of a complex layer structure. The objective of this study is the evaluation of the operating conditions of submarine pipelines subject to the action of waves and currents. A parametric study of finite element is performed to understand the influence of the boundary conditions, different span lengths of submarine pipeline and variations of soil type on the dynamic response of submarine pipeline. It is also developed an analytical solution to the problem. The numerical solutions, analytical and standard recommendations are compared and conclusions drawn on the main factors to be considered by the engineers involved in the construction of such structures.
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Più fonti

Libri sul tema "Submarine Pipeline"

1

Deepwater foundations and pipeline geomechanics. Ft. Lauderdale, FL: J. Ross Pub., 2011.

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2

Raven, P. W. J. The development of guidelines for the assessment of submarine pipeline spans: Overall summary report : report. London: H.M.S.O., 1986.

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3

Associates, Trevor Jee. Guidelines for trenching design of submarine pipelines. Sudbury: HSE Books, 1999.

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4

European Conference on Flexible Pipes, Umbilicals and Marine Cables (3rd 1999 London, England). Proceedings of the Third European Conference on Flexible Pipes, Umbilicals and Marine Cables-Materials Utilisation for Cyclic and Thermal Loading. London: Bentham, 1999.

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5

Wolf, Sarah. Unterseeische Rohrleitungen und Meeresumweltschutz: Eine völkerrechtliche Untersuchung am Beispiel der Ostsee = Submarine pipelines and marine environmental proctection : the example of the Baltic Sea under public international law. New York: Springer, 2011.

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6

Affairs, Great Britain Parliament House of Commons Secretary of State for Foreign and Commonwealth. Framework agreement between the government of the United Kingdom of Great Britain and Northern Ireland and the government of the Kingdom of Norway relating to the laying, operation and jurisdiction of inter-connecting submarine pipelines, Stavanger, 25 August 1998. London: Stationery Office, 2003.

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7

Guidance Notes for Submarine Pipeline Applications. Stationery Office Books, 1993.

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8

Guidance notes for submarine pipeline applications under the Petroleum and Submarine Pipe-Lines Act 1975. London: HMSO, 1993.

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9

J, Raven P. W., Great Britain. Department of Energy. e J.P. Kenny & Partners., a cura di. The Development of guidelines for the assessment of submarine pipeline spans: Overall summary report. London: HMSO, 1986.

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Britain, Great. Submarine Pipelines (Designated Owners) Order 2010. Stationery Office, The, 2011.

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Capitoli di libri sul tema "Submarine Pipeline"

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Ren, Yi, Wenyue Liu, Shuai Zhang, Shuang Wang e Hong Gao. "Research on Submarine Pipeline Steel with High Performance". In Energy Materials 2014, 743–50. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-48765-6_91.

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Ren, Yi, Wenyue Liu, Shuai Zhang, Shuang Wang e Hong Gao. "Research on Submarine Pipeline Steel with High Performance". In Energy Materials 2014, 743–50. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119027973.ch91.

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Delgado-Linares, Jose G., e Carolyn A. Koh. "Gas Hydrate Research: From the Laboratory to the Pipeline". In World Atlas of Submarine Gas Hydrates in Continental Margins, 3–13. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-81186-0_1.

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Yuan, Sheng-fu, Xiu-chen Li e Cheng-jia Shang. "Development of High Plasticity-Toughness Low Cost Microalloyed Submarine Pipeline Steel". In HSLA Steels 2015, Microalloying 2015 & Offshore Engineering Steels 2015, 1063–69. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119223399.ch133.

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Yuan, Sheng-fu, Xiu-chen Li e Cheng-jia Shang. "Development of High Plasticity-Toughness Low Cost Microalloyed Submarine Pipeline Steel". In HSLA Steels 2015, Microalloying 2015 & Offshore Engineering Steels 2015, 1063–69. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-48767-0_133.

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Guo, L. P., R. Liu e S. W. Yan. "Low-Order Lateral Buckling Analysis of Submarine Pipeline Under Thermal Stress". In Springer Geology, 191–94. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-31671-5_33.

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7

Xu, Jishang, Jinjing Pu e Guangxue Li. "Field Observations of Seabed Scours around a Submarine Pipeline on Cohesive Bed". In Advances in Intelligent and Soft Computing, 23–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27957-7_4.

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Sha, Y., Y. X. Wang, G. Y. Wang, G. W. Li e Z. J. Chen. "Experimental Study on Response of Submarine Pipeline over Flat Beds in Steady Flow". In New Trends in Fluid Mechanics Research, 332–35. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-75995-9_104.

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Berti, A., R. Bruschi e R. Matteelli. "Some Aspects of the Technology Relating to Submarine Pipeline Crossing of Uneven Seabed Areas". In Case Histories in Offshore Engineering, 255–92. Vienna: Springer Vienna, 1985. http://dx.doi.org/10.1007/978-3-7091-2742-1_7.

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Fang, Zhuo-yu, Shao-hua Dong e Yu-hang Duan. "Analysis of Remaining Strength and Failure of Submarine Pipeline with Double-Point Corrosion Defects". In Proceedings of the 2021 International Petroleum and Petrochemical Technology Conference, 475–90. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-9427-1_47.

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Atti di convegni sul tema "Submarine Pipeline"

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He, Guoxi, Sijia Chen, Kexi Liao e Shuai Zhao. "Study on the Distribution of Submarine Pipeline Corrosion Defects Based on Internal Inspection Data and Data Mining Method". In 2020 13th International Pipeline Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/ipc2020-9567.

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Abstract Submarine pipelines in the sea are applied for oil, gas, water and mixed transportation. Among them, 91% of the pipes contain CO2. Here, based on the existing pipeline internal inspection data of submarine pipeline, the APRIORI algorithm and least-square-support-vector-machine (LSSVM) are applied to analyze the distribution rules and defect characteristics of internal defects along the pipeline. The corrosion defects are divided into 7 types and the pipeline section is divided into 12 intervals. Also, the pipe segment has been defined as J (general pipe), W (weld) and C (close to weld). The contents include the analysis of the characteristics and types of defects, the distribution of defects along the pipe, the severity of the corrosion defects, the size characteristics of defects, and the comparison of the data detected in multiple rounds. The defect depth of four kinds of pipelines is mostly 10%–20% of the wall thickness, hereby the severity of defects is studied via the percentage distribution of corrosion depth. The data of multi-round inspection shows that the corrosions in the mixed pipeline are active and the defects are increasing. The methods and results in this paper can be employed to predict the most likely defect type, mileage location, clock orientation, and shape size of submarine pipeline corrosion. This is helpful for the integrity management of submarine pipelines.
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Brown, R. J., e A. C. Palmer. "Submarine Pipeline Trenching by Multipass Ploughs". In Offshore Technology Conference. Offshore Technology Conference, 1985. http://dx.doi.org/10.4043/4925-ms.

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Liu, Yuxiao. "Overview of Submarine Pipeline Global Buckling". In 2013 Fourth International Conference on Digital Manufacturing & Automation (ICDMA). IEEE, 2013. http://dx.doi.org/10.1109/icdma.2013.212.

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Papusha, A. N., e R. A. Sinyak. "Computer Facilities Of Submarine Pipeline Designing". In Arctic Shelf Oil & Gas Conference 2004. European Association of Geoscientists & Engineers, 2004. http://dx.doi.org/10.3997/2214-4609-pdb.185.section4_08.

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Li, Xin, Rubo Dong, Qiao Jin e Jing Zhou. "Hydrodynamic Force Model on Free Spanning Pipeline Subjected to Seismic Excitations". In ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-57081.

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Firstly, a series of model tests of free spanning submarine pipeline are carried out on an underwater shaking table in the State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology. Hydrodynamic forces imposed on the span of submarine pipeline due to different direction excitations are studied. Secondly, finite element method on the base of the theory of interaction between fluid and structure is utilized to analyze the dynamic response of free spanning submarine pipelines subjected to earthquakes. Thirdly, based on Morison equation an improved hydrodynamic force model considering the effects of seismic exciting directions is proposed. Discretized equations of motion derived from the improved Morison equation is employed to analyze the dynamic response of free spanning submarine pipelines subjected to earthquakes. FE model is established to simulate the above experimental conditions. Finally, the comparison of numerical results with experimental results shows that the improved hydrodynamic force model could satisfactorily predict dynamic response on the free spanning submarine pipelines subjected to earthquakes.
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Xiao, Ming, Qingjun Gao, Jianguo Lin, Wei Li e Xiao Liang. "Dynamics Modeling for Submarine Pipeline Oil Spill". In 2010 Second International Conference on Computer Modeling and Simulation (ICCMS). IEEE, 2010. http://dx.doi.org/10.1109/iccms.2010.11.

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Lei, Peng, e Kun Yang. "Development of Submarine Pipeline 3D GIS Platform". In 2013 Seventh International Conference on Image and Graphics (ICIG). IEEE, 2013. http://dx.doi.org/10.1109/icig.2013.160.

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Wu, Guiguang, e Kexi Liao. "Submarine Pipeline HSE Management System and Application". In International Conference on Pipelines and Trenchless Technology 2011. Reston, VA: American Society of Civil Engineers, 2011. http://dx.doi.org/10.1061/41202(423)64.

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Hulsbergen, C. H., e R. Bijker. "Effect of Spoilers on Submarine Pipeline Stability". In Offshore Technology Conference. Offshore Technology Conference, 1989. http://dx.doi.org/10.4043/6154-ms.

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Smoot, W. T., R. A. Teale e J. J. Trotter. "Semiautomatic FCAW for Submarine Pipeline Girth Welds". In Offshore Technology Conference. Offshore Technology Conference, 1987. http://dx.doi.org/10.4043/5533-ms.

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Rapporti di organizzazioni sul tema "Submarine Pipeline"

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EXPERIMENTAL AND NUMERICAL INVESTIGATION ON UPHEAVAL BUCKLING OF FREE-SPAN SUBMARINE PIPELINE. The Hong Kong Institute of Steel Construction, dicembre 2019. http://dx.doi.org/10.18057/ijasc.2019.15.4.3.

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