Results 151 to 160 of about 1,280 (210)

Dynamic response of marine risers

Engineering Structures, 1989
Abstract The dynamic response of marine risers to both regular and random waves is obtained in the time domain using a time marching numerical integration scheme to solve the equation of motion. For random sea states, time histories of sea surface elevation, water-particle kinematics and vessel top motion are simulated by a harmonic superposition ...
S. Ahmad, T.K. Datta
openaire   +1 more source

Scraping Assessment of Offshore Marine Risers

Offshore Technology Conference, 2023
Abstract 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, Feras Khalid Alfosail, Qasim Saleem, Abdulrahman Saleh Alshammari, Mohammad Salem Al khoufi, Mousa Rashed Harbi   +5 more
openaire   +1 more source

Upper Marine Riser Package

Offshore Technology Conference, 1986
ABSTRACT A new integrated riser tensioning system is presented. The system unitizes upper riser components into a compact package, and uses the slip joint as the support structure for the riser tensioning cylinders. The system is called the Upper Marine Riser Package (UMRP).
J.S. Lim, J.R. Pfeifler
openaire   +1 more source

Probabilistic Dynamical Analysis of a Marine Riser

1983
This paper presents numerical techniques of modal and spectral probabilistic analysis applied to the study of vibrations of a marine riser. The latter is fixed to a tethered buoyant platform (or tension leg platform) and can be considered as a beam with variable normal force.
De Wilde, W., Narmon, B.
openaire   +2 more sources

Vertical Dynamics of Marine Risers

Offshore Technology Conference, 1984
ABSTRACT 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

Lock-in Prediction Of Marine Risers And Tethers

Journal of Sound and Vibration, 1994
Abstract 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, 1973
A 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

Riser Recoil During Unscheduled Lower Marine Riser Package Disconnects

IADC/SPE Drilling Conference, 1998
Abstract 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

Development of an Instrumented Marine Riser Joint

Journal of Energy Resources Technology, 1982
A marine riser pup joint was instrumented to measure riser tension, bending moment, and mud temperature and pressure. The ground rules for the design, major design decisions, significant details, and calibration and testing are discussed.
J. L. Evans, D. A. Ganser, S. J. Williams   +2 more
openaire   +1 more source

Riser Modeling Scheme for a Load-Sharing Marine Drilling Riser

Volume 3: Pipeline and Riser Technology; CFD and VIV, 2007
Typical 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