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TECHNICAL PAPERS

Characterizing the Wave Environment in the Fatigue Analysis of Flexible Risers

[+] Author and Article Information
John M. Sheehan

 MCS, Galway Technology Park, Parkmore, Galway, IrelandJohnSheehan@mcs.com

Frank W. Grealish

 MCS, Galway Technology Park, Parkmore, Galway, IrelandFrankGrealish@mcs.com

Annette M. Harte

Department of Civil Engineering, National University of Ireland, Galway, IrelandAnnette.Harte@nuigalway.ie

Russell J. Smith

 MCS, Exploration House, Offshore Technology Park, Bridge of Don, Aberdeen, AB23 8GX, ScotlandRussellSmith@mcs.com

J. Offshore Mech. Arct. Eng 128(2), 108-118 (Nov 15, 2005) (11 pages) doi:10.1115/1.2185129 History: Received March 31, 2005; Revised November 15, 2005

As the offshore industry moves towards deeper water developments and continues to embrace harsh environments, unbonded flexible pipes are increasingly being utilized as a cost effective riser solution. Furthermore, with the advent of issues such as nonpristine annuli environments, the fatigue performance of these flexible risers is becoming a critical issue. This paper presents an overview of the comparisons between deterministic and stochastic global fatigue analysis techniques. Methods used to perform both deterministic and stochastic analyses are outlined, from performing the global analyses to using local models to generate armor wire stresses and subsequent fatigue damage. The paper identifies the key issues in the analysis performed and presents key results and conclusions with regard to the characterization of the wave environment in the global fatigue analysis of flexible risers.

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Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Longuet-Higgins individual wave scatter diagram for Hs=3m,Tp=11s

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Figure 2

Longuet-Higgins individual wave scatter diagram for Hs=3m,Tp=11s broken into blocks

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Figure 3

Sample time trace of curvature and alternating armour wire stress

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Figure 4

Finite element model of North Sea application riser system

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Figure 5

Normalized cumulative distribution of stress range for the stochastic and deterministic analysis, case study sea state, North Sea application

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Figure 6

Normalized cumulative distribution of stress range for the stochastic and deterministic analysis, full scatter diagram, North Sea application

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Figure 7

Finite element model of West of Africa application 2 riser system

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Figure 8

Normalized cumulative distribution of stress range for the stochastic and deterministic analysis, case study sea state, West of Africa application, hang off

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Figure 9

Normalized cumulative distribution of stress range for the stochastic and deterministic analysis, case study sea state, West of Africa application, touchdown region

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Figure 10

Normalized cumulative distribution of stress range for the stochastic and deterministic analysis, full scatter diagram, West of Africa application, hang off

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Figure 11

Normalized cumulative distribution of stress range for the stochastic and deterministic analysis, full scatter diagram, West of Africa application, touchdown region

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Figure 12

RAOs of tension and curvature at the hang off and in the touchdown region of the West of Africa application

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