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TECHNICAL PAPERS

Dynamic Response Interaction of Vibrating Offshore Pipeline on Moving Seabed

[+] Author and Article Information
Vincent O. S. Olunloyo1

Department of Systems Engineering, Faculty of Engineering, University of Lagos, Lagos 234, Nigeriavosolunloyo@hotmail.com

Charles A. Osheku

Department of Mechanical Engineering, Faculty of Engineering, University of Lagos, Lagos 234, Nigeria

Ayo A. Oyediran

 AYT Research Corp., 7922 Falstaff Road, McLean, VA 22102

1

Corresponding author.

J. Offshore Mech. Arct. Eng 129(2), 107-119 (Oct 19, 2006) (13 pages) doi:10.1115/1.2426994 History: Received January 04, 2006; Revised October 19, 2006

The dynamic response interaction of a vibrating offshore pipeline on a moving seabed is herein investigated where the pipeline is idealized as a beam vibrating on an elastic foundation. This problem is of relevance in offshore exploration where pipelines are laid either on or buried in the seabed. When such pipes carry oil and gas, the undulating topography of the sea floor and the internal motion of the fluid subject the entire structure to vibration due to bending forces and form the subject of our study. Our analysis revealed that in general, the seabed acts either as a damper or as a spring and in particular when we have sedimentation, the seabed geology permits the geomechanical property of the sediment cover to act only as a damper. As expected, external excitation will increase the response of these pipes for which an amplification factor has been derived. For soft beds, high transverse vibrations were dampened by increasing the internal fluid velocity whereas they became amplified for hard beds. These results are of contemporary interest in the oil/gas industry where deep sea exploration is now receiving significant attention.

Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

The flow geometry of the dynamic interaction of pipeline on seabed

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Figure 3

Dynamic interaction response profile for soft seabed and pipe internal diameter 150mm(6in.) at 80s

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Figure 6

Dynamic interaction response profile for soft seabed and pipe internal diameter 150mm(6in.) at 80s

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Figure 7

Dynamic interaction response profile for soft seabed and pipe internal diameter 150mm(6in.) at 80s

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Figure 8

Dynamic interaction response profile for hard seabed and pipe internal diameter 150mm(6in.) at 80s

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Figure 9

Dynamic interaction response profile for hard seabed and pipe internal diameter 150mm(6in.) at 80s

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Figure 14

Dynamic interaction response profile for hard seabed and pipe internal diameter 75mm(3in.) at 80s

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Figure 15

Dynamic interaction response profile for soft seabed and pipe internal diameter 300mm(12in.) at 80s

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Figure 18

Dynamic interaction response profile for hard seabed and pipe internal diameter 600mm(24in.) at 80s

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Figure 19

Maximum transverse response as a function of flow velocity for soft seabed and pipe internal diameter of 150mm(6in.)

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Figure 20

Maximum transverse response as a function of flow velocity for hard seabed and pipe internal diameter of 150mm(6in.)

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Figure 21

Maximum transverse response as a function of flow velocity for soft seabed and pipe internal diameter of 300mm(12in.)

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Figure 4

Dynamic interaction response profile for soft seabed and pipe internal diameter 150mm(6in.) at 80s

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Figure 5

Dynamic interaction response profile for soft seabed and pipe internal diameter 150mm(6in.) at 80s

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Figure 10

Dynamic interaction response profile for hard seabed and pipe internal diameter 150mm(6in.) at 80s

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Figure 11

Dynamic interaction response profile for hard seabed and pipe internal diameter 150mm(6in.) at 80s

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Figure 12

Dynamic interaction response profile for soft seabed and pipe internal diameter 150mm(6in.) at 80s

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Figure 13

Dynamic interaction response profile for soft seabed and pipe internal diameter 75mm(3in.) at 80s

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Figure 16

Dynamic interaction response profile for hard seabed and pipe internal diameter 300mm(12in.) at 80s

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Figure 17

Dynamic interaction response profile for soft seabed and pipe internal diameter 600mm(24in.) at 80s

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Figure 22

Maximum transverse response as a function of flow velocity for hard seabed and pipe internal diameter of 300mm(12in.)

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Figure 23

Maximum transverse response as a function of flow velocity for soft seabed and pipe internal diameter of 600mm(24in.)

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Figure 24

Maximum transverse response as a function of flow velocity for hard seabed and pipe internal diameter of 600mm(24in.)

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Figure 2

Control volume sketch for the pipeline dynamic interaction problem

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