Influence of Loading Condition on the Behavior of a Moored Liquefied Natural Gas Ship
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 131, Issue 1
Abstract
In a recent paper, a verification study was presented of the time-domain mooring simulation program TERMSIM. In that paper, the verification was restricted to the behavior of loaded ships. Extension to the verification of the model for different loading conditions is made in this technical note. For the downtime analysis of a new liquefied natural gas (LNG) terminal, the influence of the loading condition is often neglected and the analysis is only carried out for the loaded ship. This assumption seems valid, because the draft difference between laden and ballast is small for LNG ships. However, prototype measurements of line forces showed quite large increase of mooring forces during the loading process of the ship. This strong dependence also follows from computer simulations presented in this technical note. Large differences in moored ship behavior in swell waves between the loaded and ballasted condition can occur because of a different roll period and ratio between the wave frequency and stiffness of the mooring system.
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Acknowledgment
The writers wish to thank Shell Global Solutions International BV for making available the prototype measurements used in this research project.
References
Pinkster, J. A. (1980). “Low frequency second order wave exciting forces on floating structures.” PhD thesis, Delft University of Technology, Delft, The Netherlands.
van der Molen, W., Ligteringen, H., Van der Lem, J. C., and De Waal, J. C. M. (2003). “Behavior of a moored LNG ship in swell waves.” J. Waterw., Port, Coastal, Ocean Eng., 129(1), 15–21.
Van Oortmerssen, G. (1976). “The motions of a moored ship in waves.” PhD thesis, Delft University of Technology, Delft, The Netherlands.
Van Oortmerssen, G., Pinkster, J. A., and Van den Boom, H. J. J. (1986). “Computer simulation of moored ship behavior.” J. Waterw., Port, Coastal, Ocean Eng., 112(2), 296–308.
Wichers, J. E. W. (1988). “Simulation model for single buoy moored tankers.” PhD thesis, Delft University of Technology, Delft, The Netherlands.
Information & Authors
Information
Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 131 • Issue 1 • January 2005
Pages: 33 - 36
Copyright
© 2005 ASCE.
History
Received: Jun 10, 2003
Accepted: Jul 19, 2004
Published online: Jan 1, 2005
Published in print: Jan 2005
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