NDLI: Fatigue Analysis of Tether Chain in Hybrid Risers

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Cerkovnik, Mark Chang, S. Griffin, Cary
Copyright Year	2012
Abstract	Hybrid risers represent an excellent way to isolate the riser from most of the host vessel motions and thereby limit riser fatigue. A common arrangement features the riser supported by a buoyancy can via a tether chain. The tether chain is a cheap simple way to make the connection while providing flexibility for installation. However, in service the tether is under very high tension, and the chain is not really flexible in the face of small amplitude fatigue loads. The friction effectively “welds” the chain together. Moment and torque input to the system by first order vessel motions and vortex induced vibrations are carried through the chain and induce fatigue loading in the links. Analysis of the chain can be problematic because the determination of the detailed stress in the chain requires a refined FEA model with contact element between the links. From the global sense the analysis may require running hundreds of sea-state realizations in the time domain and the vortex induced vibration (VIV) assessment of thousands of current profiles. In this paper an efficient numerical method is described to rigorously determine fatigue damage at locations throughout the chain.
Sponsorship	Ocean, Offshore and Arctic Engineering Division
Starting Page	799
Ending Page	807
Page Count	9
File Format	PDF
ISBN	9780791844908
DOI	10.1115/OMAE2012-83954
Volume Number	Volume 3: Pipeline and Riser Technology
Conference Proceedings	ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering
Language	English
Publisher Date	2012-07-01
Publisher Place	Rio de Janeiro, Brazil
Access Restriction	Subscribed
Subject Keyword	Chain Engineering Fatigue Offshore Hybrid riser Hybrid risers Fatigue analysis
Content Type	Text
Resource Type	Article

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