This paper considers the dynamic stability of free-hanging water intake risers. Suspended from a barge, these risers convey a great volume of cooling water, which is needed for offshore liquefaction process of natural gas. There is a contradiction between theoretical predictions and experiments for cantilever pipes pumping up water. Reported small-scale experiments did not show any instability, while theory predicts instability beyond a critical fluid velocity. To investigate whether the previous experimental setups did not allow to observe the instability or the pipe aspirating water is unconditionally stable, a new test setup was built which could attain a higher internal fluid velocity than the predicted critical velocities. A cantilever pipe of about 5 m length was partly submerged in water. The experiments clearly showed that the cantilever pipe aspirating water becomes unstable by self-excited oscillatory motion (flutter) beyond a critical velocity of water convection through the pipe. Below this velocity the pipe is stable, whereas above it, the pipe shows a complex motion that consists of two alternating types of motion. The first type is a nearly periodic orbital motion with the amplitude of a few pipe diameters and the second one is a quasi-chaotic motion with very small amplitude. Translating these results to offshore water intake risers, shows that for realistic internal flow velocities the riser might become unstable.
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ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering
June 10–15, 2007
San Diego, California, USA
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
Volume 1: Offshore Technology; Special Symposium on Ocean Measurements and Their Influence on Design
ISBN:
0-7918-4267-3
PROCEEDINGS PAPER
Experimental Investigation of the Dynamic Behaviour of a Water Intake Riser
Guido Kuiper,
Guido Kuiper
Delft University of Technology, Delft, The Netherlands
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Andrei Metrikine,
Andrei Metrikine
Delft University of Technology, Delft, The Netherlands
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Mike Efthymiou
Mike Efthymiou
Shell E&P, Rijswijk, The Netherlands
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Guido Kuiper
Delft University of Technology, Delft, The Netherlands
Andrei Metrikine
Delft University of Technology, Delft, The Netherlands
Mike Efthymiou
Shell E&P, Rijswijk, The Netherlands
Paper No:
OMAE2007-29401, pp. 479-488; 10 pages
Published Online:
May 20, 2009
Citation
Kuiper, G, Metrikine, A, & Efthymiou, M. "Experimental Investigation of the Dynamic Behaviour of a Water Intake Riser." Proceedings of the ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering. Volume 1: Offshore Technology; Special Symposium on Ocean Measurements and Their Influence on Design. San Diego, California, USA. June 10–15, 2007. pp. 479-488. ASME. https://doi.org/10.1115/OMAE2007-29401
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