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TECHNICAL PAPERS

Alternative Design of Flexible Jumpers for Deepwater Hybrid Riser Configurations

[+] Author and Article Information
Antonio C. Fernandes, Breno P. Jacob, Rogério A. Carvalho

COPPE/UFRJ, Rio de Janeiro, Brazil

Renato M. C. Silva

PETROBRAS, Rio de Janeiro, Brazil Mem. ASME

Carlos A. D. Lemos

PETROBRAS, Rio de Janeiro, Brazil

J. Offshore Mech. Arct. Eng 123(2), 57-64 (Jan 25, 2001) (8 pages) doi:10.1115/1.1361060 History: Received March 31, 2000; Revised January 25, 2001
Copyright © 2001 by ASME
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References

Fernandes, A. C., Jacob, B. P., Silva, R. M. C., Carvalho, R. A., and Lemos, C. A. O., 1999, “Design of Flexible Jumpers for Deepwater Hybrid Riser Configurations,” XVIII International Conference on Offshore Mechanics and Arctic Engineering (OMAE), St. John’s, Canada.
Sertã, O. B., Fernandes, A. C., Pinto, F. J. C., 1997, “Consolidated Concepts for Deep Water Steel Catenary Design: Summary of a PETROBRAS Workshop,” Deep Offshore Technology Conference, DOT 1997, The Hague, Netherlands.
DeepStar, 1994, “Production Riser, Buoy Design and Installation Study,” I, Main Report, DSII CTR 420-1; Aker Omega, June.
Bouygues Offshore, 1998, “Girassol Field,” presented in PETROBRAS, Rio de Janeiro.
DeepStar, 1996, “Deepwater Hybrid Riser Study,” Doc. No.: 1085-RPT-0002 Rev:03, DSIII CTR 3401-1;2H Offshore Eng. Ltd., Nov.
Fernandes, A. C., 1997, “Up-to-date Spread-Sheet Program For Preliminary Analysis Of Flexible And Steel Catenary Risers Using Catenary Concepts,” X International Symposium on Offshore Engineering (Brasil Offshore), Rio de Janeiro, RJ, September 3–5.
Carvalho, R. A., and Fernandes, A. C., 1998, BoiSub1.xls—Microsoft Excel 5.0 Spreadsheet, Rio de Janeiro.
Bathe, K. J., 1996, Finite Elements Procedures, Prentice-Hall, Englewood Cliffs, NJ.
Mourelle, M. M., Gonzalez, E. C. and Jacob, B. P., 1995, “ANFLEX-Computational System for Flexible and Rigid Riser Analysis,” eds., F. L. L. B. Carneiro et al., International Offshore Engineering, John Wiley & Sons, Chichester/New York, pp. 441–458.
Nour-Omid, B., 1987, “The Lanczos Algorithm for Solution of Large Generalized Eigenproblems,” ed., T. J. R. Hughes, The Finite Element Method—Linear Static and Dynamic Finite Element Analysis, Prentice-Hall, Englewood Cliffs, NJ, pp. 582–630.
Orcina, 1998, Visual Orcaflex User Manual—Design Software for Flexible Risers and Offshore Systems, Orcina Limited, UK.
Nyholm-Larsen, H., Gregersen, J. R., and Mathinsen, F., 1998, “Air Suspended Flowline Between Platforms,” XVII International Conference on Offshore Mechanics and Arctic Engineering (OMAE), Lisbon, Portugal.
da Silva, S., 1999, “Ensaio em Ondas de Modelo da Bóia Submersa para Suporte de Risers de Produção” (in Portuguese), IPT Report 39994 to COPPETEC, São Paulo, July.
Fernandes, A. C., Mourelle, M. M., Sertã, O. B., Parra, P. H. C. C., and da Silva, S., 1997, “Hydrodynamic Coefficients in the Design of Steel Catenary Risers,” XVI International Conference on Offshore Mechanics and Arctic Engineering (OMAE), Yokohama, Japan.

Figures

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Behavior of function cosh(x)/x
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Variation of the top tension with the total suspended length
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Definition of the critical length
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Sketch of Excel spreadsheet for quasi-static analysis of TLR jumpers
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Influence of jumper length on top tension
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Mode shapes 1, 2, and 6
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Envelopes and time-histories of tension at the connection with the platform, undamped case
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Envelopes and time-histories of tension at the connection with the platform, CD=0.1
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Envelopes and time-histories of tension at the connection with the platform, CD=0.7
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Model test configuration; full-scale correspondence within brackets
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Numerical model—general view
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Model test results (×-marked lines) compared with numerical results (continuous lines), using drag coefficients=1.0, 2.0, and 3.0; the smaller amplitude corresponds to 1.0 and the larger to 3.0

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