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Hybrid Modelling for Dynamic Reliability Assessments in Subsea Oil and Gas Processing Systems
(Master thesis, 2017)Traditional reliability methods such as fault tree analysis and reliability block diagrams were not designed to account for the complex dynamic behavior of most industrial systems. These traditional reliability methods ... -
A hybrid multi-stage methodology for remaining useful life prediction of control system: Subsea Christmas tree as a case study
(Peer reviewed; Journal article, 2023)With the improvement of control system composition and operation process complexity, the uncertainty in its operation process increases and real-time observation data is difficult to obtain, and the influence of noise also ... -
Hybrid Prognostic Model for Residual Useful Life Estimation of Degraded Equipment
(Master thesis, 2015)As the consequence of the more widely used complex systems, there has been a shift in maintenance strategy. The traditional corrective maintenance is gradually replaced by preventive maintenance or even more advanced ... -
Hybrid Welding of 45 mm High Strength Steel Sections
(Journal article; Peer reviewed, 2017)Thick section welding has significant importance for oil and gas industry in low temperature regions. Arc welding is usually employed providing suitable quality joints with acceptable toughness at low temperatures with ... -
Hydraulic capacity of culverts under sediment transport
(Master thesis, 2014)Sedimentation frequently causes an extensive blockage in culvert which may reduce its design capacity. Culvert guidelines which are extensively used reveal little details about sedimentation in culvert. Requirement of the ... -
Hydraulic capacity of culverts under sediment transport - Multibarrel Setup
(Master thesis, 2014)As a part of the research program Natural hazards Infrastructure for Floods and Landslides (NIFS), the hydraulic performance of the culverts are presently investigated in a scale model study carried out in the NTNU ... -
Hydraulic Fluids for Offshore Applications – the Lubrication Mechanisms of Water-Based Fluids
(Doctoral theses at NTNU;2018:268, Doctoral thesis, 2018)Components used in offshore drilling applications such as hydraulic cylinders wear out earlier than expected due to the combined effect of multidegradation processes like friction, wear, mechanical stresses and corrosion. ... -
Hydraulic Performance of Advanced Treatment Media to Improve Quality of Stormwater from Airports Exposed to De-icing Chemicals
(Master thesis, 2016)Winter-runoff from airports contains a high fraction of contaminated stormwater. Contaminants such as de-icing chemicals propylene glycol and potassium formate, heavy metals and PAHs are often present in stormwater runoff ... -
Hydraulics and Thermodynamics of Closed Surge Tanks for Hydropower Plants
(Doctoral thesis at NTNU;2016:20, Doctoral thesis, 2016)This work has studied the hydraulic and thermodynamics of closed surge tanks for hydropower plants. Surge tanks are applied in hydropower plants to control and reduce the acceleration forces of the water during change of ... -
Hydraulisk utforming av nedløp fra gateavrenning
(Master thesis, 2015)I denne masteroppgaven er det sett på hvordan den hydrauliske kapasiteten til forskjellige rister varierer med hensyn på helning, vannføring i vegbanen, ristutforming og størrelse. Det er sett på hvordan kapasiteten beregnes ... -
Hydrodynamic Damping of a Fluttering Hydrofoil in High-speed Flows
(Journal article; Peer reviewed, 2018)A hydrofoil resembling a high head Francis runner blade was submerged in a rectangular channel and attached to the walls in a fixed-beam configuration. The hydrofoil was excited by piezoelectric Macrofiber composite actuators ... -
Hydrodynamic Design Principles and Structural Verification of a Hydrofoil Concept for Kiteboarding
(Master thesis, 2022)Bruken av hydrofoiler i kiteboarding har de siste ˚arene blitt stadig mer populært og vil for første gang bli inkludert i de olympiske leker i 2024. Siden oppstarten har den primære utviklingsinnsatsen vært˚a optimalisere ... -
Hydrogen assisted crack growth in iron: a simulations approach
(Doctoral theses at NTNU;2021:32, Doctoral thesis, 2021)Hydrogen enhances crack growth, limiting the lifetime of industrial components. Despite the abundance of research into hydrogen enhanced crack growth and its proposed mechanisms, none of the models can explain all the ... -
Hydrogen embrittlement effect observed by in-situ hydrogen plasma charging on a ferritic alloy
(Journal article; Peer reviewed, 2018)To study the hydrogen embrittlement (HE) effect, a novel in-situ slow strain rate tensile test together with in-situ hydrogen (H) charging by H-plasma was conducted in an environmental scanning electron microscope (ESEM). ... -
Hydrogen Embrittlement in Fe3%Si, Visited by Nanomechanical Testing and Cohesive Zone Simulation
(Chapter, 2016)This work is part of a multi scale computational and experimental approach in which first principle modelling, nanoscale experiments and continuum simulations are combined in order to represent hydrogen induced degradation ... -
Hydrogen embrittlement in subsea pipelines made from X70: Effect of plastic deformation on hydrogen diffusion
(Master thesis, 2011)As a part of the DEEPIT project at SINTEF, hydrogen permeation tests have been carried out on API X70 pipeline steel. The effect of plastic deformationon hydrogen diffusion properties has been evaluated, using a worldwide ... -
Hydrogen Embrittlement of 25Cr duplex stainless steel exposed to well fluid with H2S - effect of cold working and product form
(Master thesis, 2017)It is known that cold deformation may have detrimental effects on resistance against SulphideStress Cracking/Stress Corrosion Cracking and Hydrogen Induced Stress Cracking. Thoughit is clear that cold deformation should ... -
Hydrogen embrittlement of additively manufactured AlCoCrFeNi2.1 eutectic high-entropy alloy
(Peer reviewed; Journal article, 2022)AlCoCrFeNi2.1 eutectic high-entropy alloy (HEA) was fabricated in as-cast and additively manufactured (AM) states. The hydrogen embrittlement susceptibility of both materials was investigated through in-situ uniaxial tensile ... -
Hydrogen embrittlement of clad steel pipes: Experiments and FE modelling
(Doctoral theses at NTNU;2018:200, Doctoral thesis, 2018)Pipes with an inner layer of corrosion resistant alloy, so called clad pipes, are increasingly used in the oil and gas industry as en economical viable option for corrosion management, combining the mechanical properties ... -
Hydrogen embrittlement revealed via novel in situ fracture experiments using notched micro-cantilever specimens
(Journal article, 2018)The susceptibility of the FeAl intermetallic alloy to hydrogen-assisted cracking was investigated by in situ fracture experiments using notched micrometre-sized specimens using an Environmental Scanning Electron Microscope ...