NDLI: Analysis of Flow Induced Vibrations Effect on Service Life of Unbonded Flexible Pipe

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Tan, Zhimin Ethridge, Andrew Sheldrake, Terry Clements, Richard
Copyright Year	2004
Abstract	High frequency vibrations have been reported on flexible pipes for gas export risers installed on platforms offshore in the North Sea. The vibrations are believed to be caused by internal flow vortex shedding as pressured gas passes through the bore at a certain speed. The vibration frequency is typically above 150Hz resulting in approximately 100 billion cycles over the service life. This paper presents analytical models developed to assess the alternating stresses of the strength components induced by the flow-induced carcass vibration, and the consequent influence over their fatigue damage and overall pipe structure integrity. The studied strength layers include the interlocked carcass layer, interlocked hoop strength (pressure armor) and axial tension layers. The models illustrate the behavior of these components inside both the end fitting structure and the free suspended section. The study of a large 15 inch inner diameter gas export riser is presented with test measurements reported in literature.
Sponsorship	Ocean, Offshore, and Arctic Engineering Division
Starting Page	87
Ending Page	94
Page Count	8
File Format	PDF
ISBN	0791837459
DOI	10.1115/OMAE2004-51207
e-ISBN	0791837386
Volume Number	23rd International Conference on Offshore Mechanics and Arctic Engineering, Volume 3
Conference Proceedings	ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering
Language	English
Publisher Date	2004-06-20
Publisher Place	Vancouver, British Columbia, Canada
Access Restriction	Subscribed
Subject Keyword	Cycles Vortex shedding Vibration Service life (equipment) North sea Flow (dynamics) Pressure Stress Pipeline risers Fittings Internal flow Oscillating frequencies Armor Ocean engineering Tension Risers (casting) Pipes Fatigue damage
Content Type	Text
Resource Type	Article

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Experimental Research on Vortex-Induced Vibration of Flexible Catenary Riser Model

Consistent VIV Assessment Methodology for Unbonded Flexible Risers

Experimental Study on Flexible Bare Pipe Arrays Undergoing Vortex-Induced Vibrations

Direct Hang-Off Model to Evaluate Fatigue Damage at Riser Hang-Off

Prediction of VIV for Risers With Effective Strakes

Flexible Riser Fatigue Re-Evaluation to Extend the Service Life

Multiscale Finite Element Analysis of Unbonded Flexible Risers

Modeling VIV Supression Using Negative Lift Coefficients

Lift Coefficient Curves for Predicting Response Using Shear7

Analysis of Flow Induced Vibrations Effect on Service Life of Unbonded Flexible Pipe

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