Loop formation may occur in cables, ropes, and also risers — flexible pipes or umbilical cables — used for offshore exploitation. The phenomenon occurs when there is enough torsion moment in the line and also a low tension condition or, even in the cases of cable slack (almost zero tension) with some torsion moment. Many references discuss about the loop formation prediction in different conditions, but mostly for the cases of an initial straight cable (rope or riser) which is usually represented by a beam. The problem of the loop formation in a catenary riser including the nonlinear contact with the seabed is very important, once during the riser installation in some conditions a low tension combined with torsion moment can lead to the loop formation, which is undesirable. There is a necessity of a better understanding of this theme. The present work explores the loop formation in catenary risers comparing the results of the static and the dynamic predictions, showing an asymptotic tendency from the dynamics to the statics. For that study, geometrically-exact nonlinear beam models were employed in the statics and in dynamics, leading to very realistic loop formation predictions.
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ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering
June 9–14, 2013
Nantes, France
Conference Sponsors:
- Ocean, Offshore and Arctic Engineering Division
ISBN:
978-0-7918-5537-9
PROCEEDINGS PAPER
Loop Formation in Catenary Risers on Installation Conditions: A Comparison of Statics and Dynamics
Alfredo Gay Neto,
Alfredo Gay Neto
University of São Paulo, São Paulo, SP, Brazil
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Paulo de Mattos Pimenta,
Paulo de Mattos Pimenta
University of São Paulo, São Paulo, SP, Brazil
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Clóvis de Arruda Martins
Clóvis de Arruda Martins
University of São Paulo, São Paulo, SP, Brazil
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Alfredo Gay Neto
University of São Paulo, São Paulo, SP, Brazil
Paulo de Mattos Pimenta
University of São Paulo, São Paulo, SP, Brazil
Clóvis de Arruda Martins
University of São Paulo, São Paulo, SP, Brazil
Paper No:
OMAE2013-11426, V04BT04A046; 9 pages
Published Online:
November 26, 2013
Citation
Gay Neto, A, Pimenta, PDM, & Martins, CDA. "Loop Formation in Catenary Risers on Installation Conditions: A Comparison of Statics and Dynamics." Proceedings of the ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. Volume 4B: Pipeline and Riser Technology. Nantes, France. June 9–14, 2013. V04BT04A046. ASME. https://doi.org/10.1115/OMAE2013-11426
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