Blar i NTNU Open på forfatter "Sævik, Svein"
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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) ... -
Experimental and finite element analysis of fatigue strength for 300 mm2 copper power conductor
Nasution, Fachri Panusunan; Sævik, Svein; Berge, Stig (Journal article; Peer reviewed, 2014)The fatigue strength of a 300 mm2 stranded copper conductor was investigated experimentally and by finite element (FE) analysis. An analytical model was also developed and validated. Wires taken from the outer layer of the ... -
Experimental and numerical studies on dynamic stress and curvature in steel tube umbilicals
Dai, Tianjiao; Sævik, Svein; Ye, Naiquan (Peer reviewed; Journal article, 2020)The present paper addresses the stresses in dynamic steel tube umbilicals at the platform hang-off exposed to large motions corresponding to an extreme storm condition. Experimental tests were carried out by mounting ... -
Experimental study of drilling riser and wellhead force by small scale testing
Wang, Huanhuan; Yang, Jin; Zhang, Dongyufu; Sævik, Svein; Leira, Bernt Johan; Xu, Fei; Li, Xiao (Peer reviewed; Journal article, 2022)Small-scale model tests of a drilling riser were conducted, aiming at a better understanding of the mechanical transfer of forces from the drilling riser to the wellhead. The tests were conducted in a water tank with ... -
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 Estimation of Offshore Structure by Monitored Data and Machine Learning
Smedsland, Gjermund (Master thesis, 2022)Som en konsekvens av at et økende antall offshore-plattformer passerer sin initielt tiltenkte levetid, er utmattingssvikt ansvarlig for et betydelig antall reparasjoner i Nordsjøen. I løpet av de siste årene har ... -
Fatigue of a composite rigid wing sail designed for the shipping industry
Bouchet, Nicolas (Master thesis, 2021) -
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 ... -
A Framework for Condition Monitoring and Risk-Based Decision Support Involving a Vessel State Observer
Han, Xu; Leira, Bernt Johan; Sævik, Svein; Radhakrishnan, Gowtham; Skjong, Stian; Kyllingstad, Lars Tandle (Chapter, 2021)Digital twins have attracted significant attention across different domains for decades. In the maritime and the energy industries, digital twins have been mainly used for system condition monitoring, project visualization, ... -
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 ... -
Global buckling of pipelines - A study on different soil models
Park, Seoyeon (Master thesis, 2016)Pipelines are essential units as a energy transportation method nowadays. Buckling behaviors have been recognized as majority because it can cause sudden disconnection of pipelines and this may lead the pipeline to ...