Results 121 to 130 of about 1,207,140 (178)
Some of the next articles are maybe not open access.
Scraping Assessment of Offshore Marine Risers
Offshore Technology Conference, 2023Abstract The engineering assessment in this paper provides the recommendations for the minimum wall thickness selection of marine riser pipeline and their ability to allow the passage of in-line instrument scraper. The assessment was conducted considering two criteria: First, the minimum wall thickness for riser is evaluated against the ...
Shadid Ayedh Alnutifat +5 more
openaire +1 more source
Lock-in Prediction Of Marine Risers And Tethers
Journal of Sound and Vibration, 1994Abstract A model is presented to predict the cross-flow displacement of a deep water marine riser or tether (tendon) due to vortex-shedding in a vertically sheared flow. The displacement of each mode is determined by a balance between the energy fed into the structure over lock-in regions of the structure and the energy dissipated by the fluid ...
openaire +1 more source
An Analysis of Marine Risers For Deep Water
Journal of Petroleum Technology, 1973A model is used to calculate this static and dynamic behavior of a marine riser supported from a floating vessel. Analysis examples demonstrate the consequences of extrapolating an existing riser design into deep water, and show that the dynamic behavior of the riser, caused primarily by vessel response to waves, is a significant design factor in all ...
openaire +1 more source
Vertical Dynamics of Marine Risers
Offshore Technology Conference, 1984ABSTRACT A study of the vertical dynamics of marine riser-load systems has been performed to determine the amplitude of dynamic forces and displacements caused by heave action. The analysis predicts circumstances under which slackening or compression, and subsequent failure of a riser can occur ...
W.R. Azpiazu, V.N. Nguyen
openaire +1 more source
Riser Recoil During Unscheduled Lower Marine Riser Package Disconnects
IADC/SPE Drilling Conference, 1998Abstract In the event of a deep water emergency disconnection, the sudden release of the Lower Marine Riser Package (LMRP) connector can cause the riser string to reach destructive velocities and displacements. Impact between the outer barrel of the telescoping joint and the diverter housing must be avoided.
William Puccio, Reid Nuttall
openaire +1 more source
2019
Abstract Visual examination, optical and scanning electron microscopy were used to determine the cause of failure in the connector groove of a marine riser coupling. The specified steel was AISI 4142 (0.40 to 0.45% C; 0.75 to 1.00% Mn; 0.20 to 0.35% Si; 0.80 to 1.10% Cr; 0.15 to 0.25% Mo) normalized from 9000C.
openaire +1 more source
Abstract Visual examination, optical and scanning electron microscopy were used to determine the cause of failure in the connector groove of a marine riser coupling. The specified steel was AISI 4142 (0.40 to 0.45% C; 0.75 to 1.00% Mn; 0.20 to 0.35% Si; 0.80 to 1.10% Cr; 0.15 to 0.25% Mo) normalized from 9000C.
openaire +1 more source
Problems in Marine Riser Design
Marine Technology and SNAME News, 1982Major problems associated with the design of marine risers are identified. Two of these problems, namely, the mathematical modeling of the riser's dynamic behavior and the prediction of the hydrodynamic forces exerted on the riser, are studied. The first problem is studied with the aid of a set of consistent equations describing three-dimensional ...
openaire +1 more source
Riser Modeling Scheme for a Load-Sharing Marine Drilling Riser
Volume 3: Pipeline and Riser Technology; CFD and VIV, 2007Typical riser analysis for a marine drilling riser using the conventional composite modeling scheme will have only one line of elements mathematically representing riser pipe and auxiliary lines. The mass and weight of the riser system may be properly modeled. It is up to the analyst to include auxiliary lines’ stiffness, bending and/or axial. The rule
Roger Chang, Ed Fisher
openaire +1 more source
Large Displacement Analysis of a Marine Riser
Journal of Energy Resources Technology, 1985A method of static analysis for a marine riser experiencing large displacements is presented. The method is suitable for analyzing a riser having a known top tension and a possible slippage at the top slip joint. Utilizing the stationary condition of a functional coupled with an equilibrium equation, one can conveniently obtain the equilibrium ...
T. Huang, S. Chucheepsakul
openaire +1 more source
Necessary Tension in Marine Risers
Revue de l'Institut Français du Pétrole, 1977The tension governing transverse static and dynamic deflections in a riser is not the actual tension but the so-called « effective tension » The concept of effective tension and effective compression is thoroughly explained, and means for calculating effective forces are given. Numerical examples are worked out for risers whose length is between 152 m (
openaire +1 more source