Now showing items 21-40 of 86

    • Dynamic Analysis of ROV Operation 

      Jenssen, Fredrik Rødne (Master thesis, 2015)
      At the semi-submersible rig Snorre B, the work class remotely operated vehicle (WROV) is essential to perform drilling and production activities. Currently, the weather criterion for launching the ROV is set to four meters ...
    • Dynamic Load Effects on a Submerged Floating Tube Bridge with emphasis on Vortex-induced Vibrations 

      Schack, Maria Hapnes von (Master thesis, 2017)
      A ferry-free highway is under planning of the Norwegian Public Roads Administration on the south-west coast of Norway. Many of the fjords are characterized as very deep and wide, resulting in a need for innovative, new ...
    • Dynamic Response of Flexible Pipes Considering Different Damping Models 

      Liu, Xueying (Master thesis, 2014)
      Flexible pipe is a layered structure composed of plastic and steel materials. Under a large bending moment, the pipe layers may slide relative to each other due to internal friction. The moment curvature relationship for ...
    • Dynamic Response of Flexible Pipes During Installation 

      Lu, Xin (Master thesis, 2013)
      This paper is referring to performing dynamic analysis for an installation scenario with the bi-linear assumption for the bending moment stiffness, which is the governing component stiffness for the curvature at the touching ...
    • Dynamic Stress Behaviour of Bonded Pipes and Umbilicals 

      Li, Chunyu (Master thesis, 2015)
      The main objective of this thesis is to study the characteristics of different types of flexible pipes and summarize the existing analytical methods, and to establish the models in order to simulate dynamic stress behavior ...
    • Dynamic Stress due to End Effects in of Non-bonded Flexible Pipes 

      Li, Miao (Master thesis, 2015)
      In oil and gas industry, flexile riser is a crucial component for the production system which connected the seabed and the floating units. At the upper end of the flexible riser, bend stiffener is added to reduce the over ...
    • Effect of lay angle of anti-buckling tape on lateral buckling behavior of tensile armors 

      Zhou, Chongyao; Sævik, Svein; Ye, Naiquan; Ji, Guomin (Chapter; Peer reviewed, 2015)
      During deep water flexible pipe installation, the pipe is normally free hanging in empty condition from the installation vessel to the seabed. This will introduce large hydrostatic forces to the pipe causing true wall ...
    • Evaluation of Wellhead Fatigue for Drilling Risers - A Study on the Effect of Tension 

      Gregersen, Kathrine (Master thesis, 2015)
      In the oil and gas industry today, there is a renewed focus on structural integrity of the well- head. There exists no codes or standards on how to calculate wellhead fatigue today. However, a Joint Industry Project (JIP) ...
    • Fatigue analysis of flexible pipes using alternative element types and bend stiffener data 

      Chen, Minghao (Master thesis, 2011)
      The flexible pipe is a vital part of a floating production system. The lifetime of a flexible riser system is crucial for the Health Safety and Environment (HSE) management. As a result of this, it is very necessary to ...
    • Fatigue Analysis of Flexible Riser - Effect of Mean Stress Correction Procedures 

      Zhao, Boyang (Master thesis, 2013)
      As the critical part of the oil product system, flexible riser?s fatigue life during the normal operating service is more and more significant. Finding the most dangerous point in the flexible riser and using the accurate ...
    • Fatigue Analysis of Flexible Risers: A comparative study of different models for metal fatigue in flexible risers 

      Svoren, Daniel Frøland (Master thesis, 2013)
      This thesis used different methods to model and predict the fatiguefrom wave loads on the tensile armor layers in a flexible riser in thebending stiffener area. The additional aim of the thesis was to givethe reader an ...
    • Fatigue Crack Rrowth Simulation Using xEtended Finite Element Method 

      Liu, Sui (Master thesis, 2013)
      Fatigue crack growth analysis of offshore structure is concerned by the industry because it?s economical and practical to increasing the usage life of the strucutre by extend it?s fatigue life. S-N approachs are the most ...
    • Fatigue of Dynamic Power Cables Applied in Offshore Wind Farms 

      Bakken, Karoline (Master thesis, 2019)
      De siste årene har utviklingen innenfor offshore vind teknologi vært at installasjonene plasseres lenger unna kysten med dypere vann. De dynamiske kraftkablene som leverer strømmen fra installasjonene er viktige komponenter ...
    • Fatigue of Flexible Riser in Bend Stiffner Area 

      Grytå, Gunnhild (Master thesis, 2011)
      The development of offshore fields has reached large water depths, and hence more challenges are met in design of offshore systems. The large water depths challenge the designer in terms of high temperature and pressure ...
    • Fatigue of Flexible Risers Considering Alternative Constitutive Models 

      Grøv, Tom Are (Master thesis, 2014)
      The flexible riser is made up of both polymeric layers and steel layers, including steel tendons. Due to internal pressure and tension of the pipe, the tendons act with a normal force on the layer underneath. In the beginning ...
    • Fatigue of Pipelines resting on Uneven Seabed 

      Jin, Xing (Master thesis, 2011)
      Subsea pipelines represent the most cost effective way of transporting oil and gas from the subsea field to the market. A large network of subsea pipelines has therefore been installed both at the Norwegian continental ...
    • Fatigue Study of Copper Conductors 

      Liu, Shijie (Master thesis, 2014)
      This master thesis was carried out during the spring semester of 2014 at Department of Marine Technology in Norwegian University of Science and Technology. It was a continuous work of the master project during autumn ...
    • Flexible Pipe Stress and Fatigue Analysis 

      Li, Henan (Master thesis, 2012)
      Fatigue is an important character for the flexible pipes as they are always exposed to dynamic loading. For nonbonded flexible pipes, fatigue and stress analysis can be performed based on different assumptions of slip ...
    • Flexible Pipeline for LNG Offloading System 

      Magnusson, Stian T (Master thesis, 2013)
      A theoretical description of the flexible riser has been presented with emphasis on cryogenic inner bore fluid flow. A description of choice of material and cross-sectional design with respect to cryogenic flexible pipes ...
    • Friction models for evaluating dynamic stresses in non-bonded flexible risers 

      Dai, Tianjiao; Sævik, Svein; Ye, Naiquan (Journal article; Peer reviewed, 2017)
      This paper addresses friction models used for evaluating dynamic stresses in non-bonded flexible risers. A review of the most commonly used methods to model friction between layers in such structures was performed. Four ...