Historic overview of offshore field development Current activities and trends Mature areas versus frontier areas The North Sea & the Norwegian Continental Shelf (NCS)Ĭhapter 2 – Offshore pipelines and steel risers Table of Contents Abstract Acknowledgment Table of Contents List of Tables List of Figures List of Diagrams Mina Karimi June 26th, 2012 Stavanger, Norway Your supports, your loves and the laughs are things that keep me going forward. Last but not least, I would like to sincerely and special thank my friends and my family for everything. Furthermore, I would like to thank Tanja Bergby and Sheryl Josdal for all the support and help during my study. Terje Aven for sharing their knowledge during my study. Ljlijana Djapic Oosterkamp, Prof Tore Markeset and Prof. I also would like to thank all lecturers at the Department of Mechanical and Structural Engineering and Materials Science ‐ UiS: Prof. It is an honor to have a chance to work with him. Ove Tobias Gudmestad for all the guidance, all support, all advice and help throughout the work and during my master study.
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First of all, I would like to give sincere gratitude to my supervisor Prof. OrcaFlex outputs will be observed to find out which scenario gives the “worst” condition during pipe-lay.Īcknowledgement This thesis work is prepared to fulfill the requirement in the Master of Science degree in the Faculty of Natural Science and Technology in University of Stavanger.
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Cases presented will be named based on these directions. Different direction scenarios will be taken for the current. The bottom end of the pipeline is pinned to the seabed with no torsion allowed and will represent an anchored end. The upper end of the pipeline is fixed to the barge and will not accept torsion. These lateral links are simple but very useful components for the model to reach its equilibrium during iterations. Tension in a lateral link will represent a lateral reaction which is due to lateral forces on the pipe. Same criteria apply to the lateral links. Tension forces in a vertical link will represent stinger roller reactions when the pipe is sitting on the roller, and zero force will represent a pipe lift-off. The idea is that these links will act as “roller” restraints. The links are restricted to only accept tension forces without any shear forces or bending moments. The stinger elements are modeled as points which are held by links/tethers in both vertical and lateral directions. Fortunately the program OrcaFlex is capable to do both analyses. First step is a static analysis and the second is a dynamic analysis.
The S-lay pipeline installation method will be taken for the analysis in the 2 case study of this thesis. Calculations for two different cases related to documenting installation of steel pipelines and flexible pipelines in sideway current are included. Then guidelines and constrains for establishing the different installation methods are matters of our concerns. Therefore in the next step we introduce various installation methods for offshore pipelines and what may govern the choice of an installation method / scenario. Installation also plays an important and vital role. In the literature survey stage we elaborate on basic information about different types of offshore pipelines. Pages: 133 + enclosure: CD Contains OrcaFlex filesĪbstract This master thesis is describing the theoretical & analytical principles of pipeline installation. Key words: Steel pipeline, Flexible pipeline, Installation, Sideway current, Makassar Strait, OrcaFlex Titel of thesis: Installation of steel pipelines and flexible pipelines in sideway current Credits (ECTS): 30 Ove Tobias Gudmestad External supervisor(s):. MASTER’S THESIS Study program/ Specialization: Spring semester, 2012 Offshore Technology - Marine Technology and Subsea Engineering Open / Restricted access Writer: Mina Karimiįaculty supervisor: Prof.