Results 161 to 170 of about 1,280 (210)
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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
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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.
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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.
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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 (
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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 ...
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SUPERVISORY SWITCHED CONTROL OF MARINE RISERS
IFAC Proceedings Volumes, 2007Abstract For a riser array in deep waters interference between individual risers exposed to strong ocean current and/or large TLP motions is of concern. The lateral deflections are likely to be large, and the risers may experience collision with fatigue or surface damage as a consequence.
Anne M. Rustad +2 more
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Coupled Nonlinear Flexible Marine Riser
2014In Chap. 7, boundary control for a coupled nonlinear flexible marine riser with two actuators in transverse and longitudinal directions is developed to reduce the riser’s vibrations. The dynamic behavior of the flexible riser is represented by a distributed-parameter system (DPS) model with partial differential equations (PDEs), and the control is ...
Wei He +3 more
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Evolutionary Design of Marine Riser Systems
23rd International Conference on Offshore Mechanics and Arctic Engineering, Volume 1, Parts A and B, 2004It is said that nature attempts to solve the ‘problem of life’ through evolution. ‘Solutions’ are proposed which are then tested in the world around us. Natural selection ensures that the best characteristics are inherited by subsequent generations. This paper gives details of a new method of automated riser design and optimization using techniques ...
Nicholas Cunliffe +3 more
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Natural Frequencies of Marine Drilling Risers
Journal of Petroleum Technology, 1976This paper gives the mathematical basis for determining natural frequencies and corresponding mode shapes for marine drilling risers. Numerical results relate natural frequencies to riser parameters; the data cover risers operating within 600 ft of water. An approximate method is given for establishing marine-riser natural frequencies.
D.W. Dareing, T. Huang
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Dynamic analysis of a marine riser
2008The problem of the dynamic analysis of a marine riser is considered in this thesis. The equations of motion for a marine riser undergoing large three dimensional deflections and rotations are derived using modal discretization approach. The nonlinear expressions for the bending and torsional deformations are obtained for a beam undergoing finite ...
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2003
A steel catenary riser (16) is suspended from a floating platform (14) hanging in tension between seabed (12) and surface (10). A flexible conduit (18) extends between an upper end J of the steel riser and a fluid connection point F on the platform. An arm or tether 20 extends between the upper end (J) of the riser(s) and a hanging point (H) elsewhere ...
STOLT OFFSHORE SA, BEATRIX ETIENNE
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A steel catenary riser (16) is suspended from a floating platform (14) hanging in tension between seabed (12) and surface (10). A flexible conduit (18) extends between an upper end J of the steel riser and a fluid connection point F on the platform. An arm or tether 20 extends between the upper end (J) of the riser(s) and a hanging point (H) elsewhere ...
STOLT OFFSHORE SA, BEATRIX ETIENNE
openaire +1 more source