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Dissertations / Theses on the topic 'Offshore engineering [LM-DM270]'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 April 2022

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1

Valpiani, Giovanni. "Welding Book of an Offshore Jacket." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/15255/.

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La tesi riguarda la redazione del "Welding Book" per il caso studio di un Jacket Offshore. Il corpo del testo è costituito da una breve introduzione sulla saldatura e sul progetto che è stato preso in considerazione per realizzare il Welding Book. Una seconda parte teorica con richiami alle normative e specifiche utilizzate, riguardante le nozioni necessarie per realizzare il libro di saldatura. Una terza parte tecnica che racchiude il Welding Book; in particolare un elenco di tutte le saldature da effettuare nel progetto, le WPS (Welding Procedure Specification) e le WPQR (Welding Procedure Q
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2

Righi, Bento Pereira Rafael. "Dynamic Analysis and Fatigue Assessment of a Jacket-type Offshore Platform." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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This work aims to evaluate the environmental loads and make the fatigue analysis in a Jacket-type platform situated in the North sea.Under this line of thought. Then, a static and a dynamic fatigue analysis are evaluated and compared.
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3

Rasekhafshar, Samsam. "Global Fatigue Assessment of a Decommissioned Jacket Platform for a Sustainable Reuse as an Offshore Wind Turbine." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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When the offshore oil and gas supplies exhaust, offshore platforms must be decommissioned and removed. The present thesis highlights the importance of evaluating the possibility of reuse of decommissioned offshore jacket platforms for offshore wind energy. In order to shift to the new structure, the topside must be removed from the substructure and a wind turbine can be installed in its place. The feasibility of this project was investigated using a finite element analysis software called Sesam. To study fatigue life in offshore structures, an exhaustive review of the background and state of
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4

Rustico, Althea. "Dynamic actuation model for vibration reduction in offshore cranes." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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The handling of offshore payloads is a critical operation that presents numerous challenges, in particular related to the required precision in controlling their oscillations in a safely and accurate manner. The uncontrolled payload oscillations induced by the rolling movement of the vessel have been historically mitigated by the experience of on-deck operators by means of taglines. The availability of experienced personnel is not always present and a manual control operation still presents inconsistent performances and a high risk for the safety of men and machines. A similar problematic, alt
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5

Radulovic, Luka. "Influence of advanced load simulation models on fatigue design of jackets for offshore wind turbines." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/6369/.

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Constant developments in the field of offshore wind energy have increased the range of water depths at which wind farms are planned to be installed. Therefore, in addition to monopile support structures suitable in shallow waters (up to 30 m), different types of support structures, able to withstand severe sea conditions at the greater water depths, have been developed. For water depths above 30 m, the jacket is one of the preferred support types. Jacket represents a lightweight support structure, which, in combination with complex nature of environmental loads, is prone to highly dynamic beha
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6

Alessi, Lorenzo. "Design of wind tower in existing offshore platforms." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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Jackets are the most common structures in the Adriatic Sea for extracting natural gas. These structural typologies are suitable for relative low water depth (around 250m) and flat sandy sea floors. Most of them have been built in the last 50 years. When the underground source finishes, these structures should be moved to another location or removed if they reached their design life. Nevertheless, another solution might be considered: change the future working life of these platforms by involving renewable energy and transforming them into offshore wind towers. The present research proposal aim
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7

Randi, Nicolò. "Analysis of floating photovoltaic systems and their future role in the green economy." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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Floating PV systems technologies have been analysed to identify the best solution. By analysing the costs of the structures and the respective LCOE. Identified the solution with the lowest value, we studied in detail project. The lower LCOE was for the OS-75 platform and is €35/MWh. The costs of connecting the energy to the land have been ignored. The project represents an investment opportunity for renewable energy companies. Taking into account the distance from the LCOE for floating PV and Ground Mounted, the LCOE of both solutions is close. On the OS-75 platform, the horizontal modules dec
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8

Unida, Roberto. "An investigation on the offshore wind energy potential in Italy and its deployment with floating turbines." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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The thesis aim is to offer a general assessment of potential of offshore wind deployment in Italy. More specifically, it aids with the identification of the most promising locations and estimates the levelized cost of energy of the areas found suitable. Furthermore, the thesis develops a simple technical feasibility study at one of these sites, which specifically focuses on the design of the wind turbines foundations, considering and comparing different geotechnical solutions. It is been found that, in Italy, the offshore area suitable for the installation of wind farms is approximately 110,
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9

Takavar, Sadegh. "Investigation of Vertical Axis Wind Tower Installation on Existing Offshore Platforms." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Jacket structures are the most common offshore tools for extraction of oil and natural gas in relative low water depth. Lots of these structures exist in Adriatic Sea and most of them have been constructed in the last 50 years. When the offshore oil and gas supplies exhaust, these structures must be relocated to another zone containing underwater resources or take them away if reaching the design life. Alternatively, another solution can be taken into account: altering the future working life of these platforms by bringing renewable energy into use and transforming them into offshore wind towe
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10

Laricchia, Francesco. "Study of offshore flexible pipelines with analytical and numerical methods." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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The work outlined presents three different analytical approaches for analyze a flexible pipelines, combined in one unified formulation. Additionally, a finite element model of an unbonded flexible riser is presented. Are reported results and discussion about a flexible pipeline subjected to a tensional load and internal pressure and focus on Axial tension-elongation curves under different lay angles of helical tendons.
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11

Hamadi, Hasan. "Structural analysis of an offshore steel monotubular platform ‘morena-1’ and fatigue assesment of leg-boat landing connection joint." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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Structural analysis of ‘MORENA-1’ platform. As a start for the work,a 3D model wa performed. Firstly, materials and sections were defined, and then assigned to the elements, then a check of dead load case was done to be sure that no design errors are involved. After the check of the design, soil properties for the foundation pile were defined also. For the soil property, two values of undrained shear strength of soil were given in the original project at z=0 at sea bottom and z=-50m, then lateral p-y curves were studied at 30 levels of 1 m space in between. After p-y curves were defined, no
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12

Bianchi, Mattia. "Deterministic and spectral fatigue analysis of the Additional Living Quarter platform in the North Field Bravo." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

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Fixed offshore platforms, especially jacket type platforms, are the most common offshore structures used for oil & gas industry in the Persian Gulf due to its shallow water depths. Sea waves are cyclic loads and have random nature. Thus, the cyclic sea wave forces lead to fatigue damages in jacket’s joints. There are different methods to investigate the fatigue life of jackets such as deterministic method and spectral method. In this thesis, three kinds of assessment methods have been used to estimate the fatigue life of a living quarter jacket platform, at North Field Bravo (Persian Gulf): t
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13

Zarifkar, Marziyeh. "Investigation of Horizontal Axis Wind Tower Installation on Existing Offshore Platforms." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Jackets are the most common offshore structures used to extract oil and natural gas in relative low water depth specially, in Adriatic Sea. Most of them have been built in the last 50 years. When the offshore resources run out, these structures must be displaced to another area containing underground resources or removed in the case of reaching to the design life. However, another solution can be investigated: changing the future working life of these platforms by introducing renewable energy and converting them into offshore wind towers. This thesis intends to examine the possibility of chan
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14

Liu, Biheng. "Reduced order models for the analysis of offshore lattice structures." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.

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The lattice is a common frame applied in offshore structures benefiting from their economic construction and easily accessible, for example, the jacket platform of the offshore wind turbine. In order to accelerate the design process of a model, this thesis proposed a method to reduce the order of the offshore lattice structure models. The full order model is constructed based on the FEM. Applying the MDOF mass discrete concept lumps the structure mass on each story center. Meanwhile, apply the DSM to determine the displacement and the forces implied on the mass center for accomplishing the uni
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15

Dissegna, Camilla. "Experimental analysis of the MoonWEC floating model in a wave flume." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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This document aims to show the experiments conducted in order to validate the MoonWEC’s theoretical floating model, together with the description of relative results. The MoonWEC is a wave energy converter prototype designed as a point absorber working as an oscillating body in heave. It’s composed of a cylindrical floating body with a cylindrical hollow inside it which works as a moonpool when filled by water, and from which the device also takes its name. The device exploits the relative motion between the floater and the moonpool for energy conversion and, in order to maximize said relative
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16

Di, Nicola Felice. "Decommissioning of an offshore platform as a wind turbine support by using digital twin." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.

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The aim of the research project is the decommissioning of an existing oil and gas platform located in the Adriatic Sea and the re-utilization of the three-legs jacket as wind turbine support The project consists of two main phases. In the first phase, the existing structure, the oil and gas platform, is examined through the structural analysis using an RB-FEA software considering the in-place loads applied. Further, the fatigue analysis is performed in order to assess the resistance of the structure respect the long terms environmental actions caused by waves. In the second phase, the
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17

Succi, Martino. "Analysis of the efficiency of air and steam-assisted flares on offshore platform." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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Gas Flaring is nowadays uniquely recognized as a major environmental threat. In addition to that, it has been estimated that flaring operations are one potential under-reported or non-reported pollutants source. Studying a flaring process, characterizing its emissions, and evaluating key indicators, such as the destruction & removal efficiency (DRE) and/or the combustion efficiency (CE), may be extremely difficult primarily due to (1) Type of Industrial Plant & Composition of the Stream to be flared, (2) Operation Mode, (3) Flare Design, (4) Meteorological Conditions, and (5) Possible Flare
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18

Abu, Snaina Sufyan Ibrahim Mohamed. "Metocean Climate Impact on the Fatigue Assessment of a Jacket-Type Offshore Platform." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.

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When the offshore oil and gas supplies exhaust, most offshore platforms are decommissioned and removed. The purpose of this paper is to evaluate the fatigue damage that will occur during the service life of a jacket-type offshore platform using different fatigue approaches in particular locations. The locations considered for this metocean climate impact study were Norway (North Sea), Portugal (Atlantic Ocean - Leixões) and Italy (Adriatic Sea). A finite element model was created by the means of Sesam and two different fatigue analysis, deterministic and spectral, were applied. For the fati
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19

Musayev, Namig. "Analysis of Security Threats for Offshore Oil&Gas Installations." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Offshore oil & gas operations are a key part of the supply of energy in many countries. Worldwide, about a third of the oil is produced offshore and, in Europe, more than 80% of the current oil and gas production takes place offshore. In spite of their location, which makes them inherently more difficult to reach, offshore oil and gas installations are susceptible to security-threatening external agents. The attractiveness is linked to the high amount of hazardous substances handled, the socio-political location of the target installations, and the possibility of obtaining proprietary informat
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20

Floridia, Daniele. "Hybrid foundations for offshore wind turbines." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2012. http://amslaurea.unibo.it/3284/.

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Nowadays offshore wind turbines represents a valid answer for energy production but with an increasing in costs mainly due to foundation technology required. Hybrid foundations composed by suction caissons over which is welded a tower supporting the nacelle and the blades allows a strong costs reduction. Here a monopod configuration is studied in a sandy soil in a 10 m water depth. Bearing capacity, sliding resistance and pull-out resistance are evaluated. In a second part the installation process occurring in four steps is analysed. considering also the effect of stress enhancement due to fr
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21

Spinosa, Lorenzo. "Cost Estimating Process: applicazione ad un Caso Studio nel Settore dell’Offshore Energy." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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L’elaborato finale è suddiviso in 3 sezioni: Sez. I, nella quale viene presentata l’azienda ospitante (Rosetti Marino SpA), il settore nel quale opera principalmente (Offshore Energy) e più nel dettaglio, del reparto che si occupa del processo di realizzazione del Preventivo (Cost Estimating Process, Ufficio Tendering) per presentare al Cliente un’Offerta competitiva al fine di aggiudicarsi il Contratto. Nella Sez. II è descritto più nel dettaglio il Processo di Cost Estimating: valutazione e stima di tutti i costi (Offshore Direct Costs, Onshore Direct Costs, Indirect Costs e “On Top” Costs)
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22

Laham, Noor. "Episodic DSS tests to measure changing strength for whole-life geotechnical design." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Changes in seabed soil strength due to loading events during the life of a structure, affect the response of the structure to any future event. This change in soil strength due to loading events, in particular cyclic loads, was of great concern in the field of offshore geotechnics during the last decades. Allowing for these changes can have a beneficial outcome on the design. Studying the changes occurring in the soil can be mainly done using large scale centrifuge tests or Laboratory element testing, where the latter proved to be able to successfully illustrate soil strength changes during pe
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23

Mazzarella, Martina. "Numerical modelling of hydrodinamics and morphodynamics for the Friuli Venezia Giulia coast." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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Integrated Coastal Zone Management (ICZM) should be considered as one of the main components to be able to implement sustainable development. Friuli Venezia Giulia region with its 93 km of coastline is committed to investing its resources in projects aimed at studying the evolution of the coast. In this report, reference will be made to the area in front of the municipality of Grado, where the Banco della Mula di Muggia is located. Starting from previous studies and surveys, morphology of the coastal stretch between the municipality of Grado and the mouth of the Isonzo river will be reproduc
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24

Aidibi, Ali. "Stress Concentration Factor and Fatigue Life Evaluation in offshore tubular KT-Joints." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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In the last few decades, offshore field has grown fast especially after the notable development of technologies, explorations of oil and gas in deep water and the high concern of offshore companies in renewable energy mainly Wind Energy. Fatigue damage was noticed as one of the main problems causing failure of offshore structures. The purpose of this research is to focus on the evaluation of Stress Concentration Factor and its influence on Fatigue Life for 2 tubular KT-Joints in offshore Jacket structure using different calculation methods. The work is done by using analytical calculations, ma
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25

Gabelli, Filippo. "Security analysis of physical attacks to offshore O&G facilities." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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Chemical and petrochemical plants are susceptible to malicious acts due to the attractiveness brought by the substances handled, the possibility to thieve secret information, and their strategic importance. Thus, a number of qualitative and semi-quantitative methodologies have been developed for the assessment of vulnerabilities of such sites. Similarly, offshore facilities, that are central in the production of hydrocarbons, were subjected to physical and cyber security events as is outlined in relevant past accident analysis. However, there are just few methodologies tailored for the identif
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26

Valentini, Francesco. "Experimental and numerical study of methods to displace oil and water in complex pipe geometries for subsea engineering." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/17528/.

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The purpose of the thesis is to study fluid displacement operations in complex pipe geometries utilized in offshore petroleum industry. Typically, MEG or Methanol is circulated through specific sections of the subsea production systems to lower the hydrocarbon content. This is often done at the beginning of production after a prolonged production shut-in, to avoid formation of hydrates or to minimize the emissions of chemicals to the environment. Experimental and numerical analyses have been conducted modifying a previously built pipe system formed a U-shaped jumper, adding a fluid recirculat
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27

Baco, Gerond. "Uplift Behaviour of Screw Piles for Offshore Deepwater Wind Turbine Foundations." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

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The two main types of foundations used so far for offshore wind energy applications are the conventional solution, the so-called mono-piles and the less conventional suction caissons. In the case of the monopiles cyclic loading is identified as the main issue to be considered, and for suction caissons, a quite large number of design issues are present, but prevalent on the others, is the tension capacity. The idea to extend screw piles to offshore applications is becoming nowadays actual. This type of foundation has a quite large onshore application but not offshore so far. They have excellen
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28

Leo, Riccardo. "The axial response of offshore piles in sand from large scale tests." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

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This thesis focuses on deep foundations used in offshore environment, in particular for offshore wind turbines. Piles are necessary when the bearing capacity of the shallow soil layers is not enough to ensure stability. Piles can work on both axial and lateral response. In the thesis only axially loaded piles will be considered. The analysis of the axial behavior of piles should be considered in terms of ultimate capacity as well as the load transfer mechanism between the pile and the soil. The technical aim of this thesis concerns the understanding of the load transfer curves, their extrapo
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29

Rai, Tannaw. "Parametric study of offshore structures with magneto-rheological tuned liquid column damper." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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The master thesis work involved the implementation of Magneto-rheological tuned liquid damper for the mitigation of undesired vibration caused in offshore structures. The research begins with the study of passive tuned liquid column damper with uniform and non-uniform cross-section, coupled with an offshore structure under random wave force. The results show that increasing the density of the liquid used in the TLCD system gives better results, which provides an opportunity to use fluids with varying density and possibility to modify the conventional passive system into a semi-active damping s
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30

Alhajali, Abdallah. "Analysis of existing offshore structures considering structural damage to investigate a vertical axis wind tower." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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The most common offshore structures are the Jackets which are tools used to extract the oil and natural gas in relative low water depth particularly exist in Adriatic Sea and a lot of them have been constructed in the last 50 years. When the offshore oil and gas resources exhaust, these structures must be replaced to another region containing underground resources or removed if reaching the design life, furthermore, another solution can be considered: changing life of the future working of these platforms by applying renewable energy and alternating them into offshore wind towers. This thesis
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31

Saliba, Georges. "Assessment of decarbonization possibilities for offshore oil and gas platforms using the EnergyPLAN model." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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Offshore oil and gas extraction is a high-energy process that produces CO2 and methane, which are released into the atmosphere, as well as chemicals, which are discharged into the sea. The oil and gas industry accounts directly or indirectly for the 42% of the global emissions. In order to play its role in mitigating climate change, the oil and gas industry must reduce emissions of at least 3.4 tons of carbon dioxide equivalent (GtCO2e) annually by 2050 to reduce the current emissions by 90%. Four scenarios for a hypothetical offshore gas platform in the North Adriatic Sea were presented, asse
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32

Peccerillo, Carmine. "Tender Management within the EPC Process in the Offshore Energy Sector." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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La transizione del settore energetico unita alla volatilità dei mercati, costringe le società dell'industria Oil&Gas ad un continuo adattamento delle strutture e delle strategie per competere. Da un lato le grandi Company dell'industria Upstream costrette a fronteggiare la caduta del prezzo del petrolio con maggior riguardo a costi e efficienza, dall'altro gli EPC Contractor che forniscono la gestione dell'intero ciclo di realizzazione di grandi impianti industriali secondo contratti Turn Key, costretti ad assumersi sempre più rischi con conseguente riduzione dei margini di profitto. In questo
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33

Caiafa, Alessio. "Decommissioning of a tension leg platform – possible removal options for a challenging project in the Gulf of Mexico." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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The Decommissioning is a “multidisciplinary” process by which an Oil Company goes through of deciding how best shut down the oilfield activities at the end of the field life, plugging and abandoning the well(s), making the equipment/installation safe, remove some or all the facilities (offshore structures and appurtenances e.g.: platforms, top sides, jackets etc.) and restoring the area. Decommissioning will occur at different stages of asset lifecycle and has wide relevance in terms of reputation, so it needs to be managed properly as a dedicated business process. Usually Oil Companies deco
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34

Mutallimov, Turan. "Wind load effect on storage tanks in Azerbaijan." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23576/.

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Oil storage tanks play a significant role in social and economic development in Azerbaijan where is known as an oil producer country; however, there have been various cases of wind and earthquake destruction. The effect of wind disturbance on dynamic responses is analyzed, and the role of storage ratio and seismic waveform on dynamic responses under wind-earthquake activity is investigated further. The results show that the wind disruption effect has a significant impact on the dynamic responses of liquid storage tanks, especially in the empty state. When the liquid storage level is high, trad
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35

Younes, George. "Integration of offshore renewable energy sources for the production of chemical energy vectors: The case of Hydrogen." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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Energy is the fuel that drives our economies. Energy demand is on the rise, and so the challenge of meeting the needs for safer, more efficient, and environmentally friendly solutions. With the aim of staying below the 2℃ scenario and agreeing with the 2015 Paris agreement and the European Union 2050 Green Deal, further action is required to ensure a smooth energy transition. In the offshore context the challenge persists, as renewable energy is weather and climate dependent, but represents a great opportunity for energy transition. For these reasons, along with the latest oil crisis due to C
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36

Ravipati, Venkata Raja Sekhar Reddy. "Design and modelling of boat landing for jacket platforms in the Adriatic sea." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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Boat landings on fixed offshore platforms are designed to absorb the impact energy from the boats approaching the platform for crew transfer. As the size and speed of operating boats vary, the design and maintenance of the boat landings become more challenging. Different oil and gas operators adopt different design criteria for the boat landing design. The objective of this study is to develop structural calculations and safety checks regarding a boat landing structure installed on an Offshore Platform in Canale di Sicilia. The useful international codes are ISO 19902 and to carry out the stru
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37

Saberi, Sina. "Analysis of Unreinforced and Reinforced Tubular T-Joints Structures with Open Source Finite Element Software." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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Tubular Joints play quite a vital role in most of the marine structures. It is obvious that having full control about the capacity and strength of tubular joints would be very worthy to have good knowledge about the total performance of the structure. In recent years the application of the finite element method has become very popular in the analyses of different types of welded circular tubular joints. The rapid development of FE programs and computation facilities has extended the analyses in the study of stress distribution and load-displacement behavior of a joint to the assessment of the
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38

Ouakka, Slimane. "On the static strength of reinforced joints." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

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The title, On the Static Strength of Reinforced Joints, shows the main subject of this research. The main aim of this study is to analyze the static strength of joints when geometrical and/or mechanical parameters change, by the use of Finite Element (FE) Model. In the current study a FE Model with the use of shell element was modelled as requested from the codes, that for a new configuration of Joints suggest using FE Models, and since this type of strategy are mesh dependent especially for cases where the concentration of stress is sharp it needs to be calibrated by using physical experimen
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39

Donnini, Lorenzo. "Numerical modelling of axially loaded piled foundations with physical tests validation." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.

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L'oggetto della tesi è la modellazione numerica di pali di fondazione per turbine eoliche in ambiente offshore. Il metodo di modellazione comprende l'interpretazione di prove CPT per l'estrapolazione dei parametri geotecnici del terreno, la creazione di un modello dell'interazione tra struttura e terreno tramite il software agli elementi finiti Abaqus, la sua verifica, l'ottimizzazione dell'estensione del modello del terreno e della mesh e la simulazione numerica del comportamento di pali caricati assialmente in compressione. Grazie al confronto con i risultati di test su modelli fisici, es
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40

Saqib, Muhammad. "The use of laboratory and site tests data in the finite element modelling of offshore piles subjected to tensile loading." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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The thesis investigate the response of pile foundations subjected to axial load, with application to offshore wind turbines supported by multi-pod steel jackets. Wind turbines are relatively light weight structures as compared to other offshore structures and this results on the foundation in high tensile loadings. For this reason, the thesis focus is the response of a open ended steel pile subjected to pull out. The study develops on the results of a large-scale testing campaign recently conducted at the Test Centre of Support Structures of the Universität Hannover. The model piles encompasse
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41

Muraleedharan, Atmaram. "Fatigue design and dynamic analysis of Steel catenary risers at Touch down zone with nonlinear soil structure interaction model under randomly generated waves." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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The offshore industry is moving deeper and deeper into the ocean depths and a subsequent technological advancement are inevitable factors. Steel Catenary Risers (SCRs) are the most popular type of deep water risers and are very important part of any deep-water developments. Although the simplicity in installation and the associated economic advantage makes it widely popular, these highly slender structures are very sensitive to dynamic loads and fatigue. Hang-off point where the riser is connected to the floater and Touch Down Zone (TDZ) where the riser interacts with the seabed are the two-im
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42

Silingardi, Alberto. "Design of a Subsea Observatory to monitor the environmental impacts in a decommissioned area." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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Abstract:
When oil and gas fields end production, offshore installations need to be dismantled and disposed of. The set of processes used to do this could be summed up in the term Decommissioning. The Decommissioning of fixed offshore structures is one of the biggest technical and operational challenges in the O&G industry. Due to this complexity, also in term of HSE, in particular site Decommissioning could lead to potential environmental hazards which need to be monitored. The BP Miller platform is going to be completely decommissioned in the near future. Due to derogation to the OSPAR legislative fra
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