The development of a vortex induced vibration (VIV) fatigue factor of safety (FoS) consistent with state-of-the-art industry design practice is cast within the coherent framework of reliability analysis. The proposed methodology consists of the following steps: (i) define the failure criteria or limit-state function (ii) setup a deterministic analysis model (iii) characterize the uncertainties involved in the problem (iv) propagate the uncertainties through the deterministic model and assess the probability of failure due to VIV fatigue and (v) calculate the FoS required to achieve a given failure probability. The proposed methodology is demonstrated by determining the FoS associated with using state-of-the-art VIV prediction models to attain varying reliability levels (probabilities of failure) in a hypothetical design scenario. Prediction uncertainty is based herein on measured flow and response data for several full-scale drilling risers working in the field. Results indicate that depending on the reliability level required of a particular design, different FoS than those that currently appear in guidance may be appropriate. Results also indicate the sensitivity of the FoS to the riser and prevailing current type, analysis program and input parameters, and accumulation of conservatism in aggregate versus single-event damage predictions.

References

References
1.
Marcollo
,
H.
,
Vandiver
,
K.
, and
Chaurasia
,
H.
,
2007
, “
Phenomena Observed in VIV Bare Riser Field Tests
,”
Proceedings of the 26th International Conference on Offshore Mechanics and Arctic Engineering
, ASME OMAE2007-29562.
2.
Trim
,
A.
,
Braaten
,
H.
,
Lie
,
H.
, and
Tognarelli
,
M.
,
2005
, “
Experimental Investigation of Vortex-Induced Vibration of Long Marine Risers
,”
J. Fluids Struct.
,
21
(
3
), pp.
335
361
.10.1016/j.jfluidstructs.2005.07.014
3.
Tognarelli
,
M.
,
Taggart
,
S.
, and
Campbell
,
M.
,
2008
, “
Actual VIV Fatigue Response of Full Scale Drilling Risers: With and Without Suppression Devices
,”
Proceedings of the 27th International Conference on Offshore, Mechanics and Arctic Engineering
, ASME OMAE2008-57046.
4.
Tognarelli
,
M. A.
,
Slocum
,
S. T.
,
Frank
,
W. R.
, and
Campbell
,
R. B.
,
2004
, “
VIV Response of a Long Flexible Cylinder in Uniform and Linearly Sheared Currents
,”
OTC 16338, Offshore Technical Conference
.
5.
Vandiver
,
J. K.
,
Leverette
,
S.
,
Wajnikonis
,
C. J.
, and
Marcollo
,
H.
,
2007
,
User Guide for SHEAR7 Version 4.5
,
MIT, Cambridge
,
MA
.
6.
Chaplin
,
J. R.
,
Bearman
,
P. W.
,
Cheng
,
Y.
,
Fontaine
,
E.
,
Graham
,
J. M. R.
,
Herfjord
,
K.
,
Huera Huarte
,
F. J.
,
Isherwood
,
M.
,
Lambrakos
,
K.
,
Larsen
,
C. M.
,
Meneghini
,
J. R.
,
Moe
,
G.
,
Pattenden
,
R. J.
,
Triantafyllou
,
M. S.
, and
Willden
,
R. H. J.
,
2005
, “
Blind Predictions of Laboratory Measurements of Vortex-Induced Vibrations of a Tension Riser
,”
J. Fluids Struct.
,
21
(
1
), pp.
25
40
.10.1016/j.jfluidstructs.2005.05.016
7.
Bearman
,
P. W.
,
Chaplin
,
J. R.
,
Fontaine
,
E.
,
Graham
,
J. M. R.
,
Herfjord
,
K.
,
Lima
,
A.
,
Meneghini
,
J. R.
,
Schulz
,
K. W.
, and
Willden
,
R. H. J.
,
2006
, “
Comparison of CFD Predictions of Multi-Mode Vortex-Induced Vibrations of a Tension Riser with Laboratory Measurements
,”
Proceedings of the 6th International Symposium on FSI, AE and FIV+N, ASME PVP Division Summer Meeting
, ASME PVP2006-ICPVT11-93177.
8.
Tognarelli
,
M. A.
,
Yin
,
F.
,
Campbell
,
M.
, and
Achanta
,
V.
,
2009
, “
Benchmarking of SHEAR7v4.5: Comparisons to Full Scale Data and Legacy Analyses
,”
Proceedings of the 28th International Conference on Ocean, Offshore and Arctic Engineering
, ASME, OMAE2009-79443.
9.
Chasparis
,
F.
,
Modarres-Sadeghi
,
Y.
,
Hover
,
F. S.
,
Triantafyllou
,
M. S.
,
Tognarelli
,
M. A.
, and
Beynet
,
P. A.
,
2009
, “
Lock-in, Transient and Chaotic Response in Riser VIV
,”
Proceedings of the 28th International Conference on Ocean, Offshore & Arctic Engineering
, ASME, OMAE2009-79444.
10.
Vandiver
,
K.
,
Swithenbank
,
S.
,
Jaiswal
,
V.
, and
Marcollo
,
H.
,
2006
, “
The Effectiveness of Helical Strakes in the Suppression of High-Mode Number VIV
,”
Offshore Technical Conference
, OTC 18276.
11.
Winterstein
,
S. R.
,
Jha
,
A. K.
, and
Kumar
,
S.
,
1999
, “
Reliability of Floating Structures: Extreme Response and Load Factor Design
,”
J. Waterway, Port, Coastal, Ocean Eng.
,
125
(
4
), pp.
163
169
.10.1061/(ASCE)0733-950X(1999)125:4(163)
12.
Lemaire
,
M.
, and
Pendola
,
M.
,
2006
, “
PHIMECA-SOFT
,”
Structural Safety
,
28
(
1–2
), pp.
130
149
.10.1016/j.strusafe.2005.03.007
13.
Iranpour
,
M.
, and
Taheri
,
F.
,
2006
, “
The State-Of-The-Art Review of Risers VIV Fatigue
,”
Proceedings of the 25th International Conference on Offshore Mechanics and Arctic Engineering
, ASME OMAE2006-92636.
14.
Leira
,
B.
,
Meling
,
T.
,
Larsen
,
C. M.
,
Berntsen
,
V.
,
Stahl
,
B.
, and
Trim
,
A.
,
2005
, “
Assessment of Fatigue Safety Factors for Deep-Water Risers in Relation to VIV
,”
ASME J. Offshore Mech. Arctic Engineering
,
127
, pp.
353
358
.10.1115/1.2087548
15.
Mork
,
K.
,
Sodal
,
N.
, and
Souza
,
L.
,
2001
, “
Present and Future Fatigue Analysis Procedure for Dynamic Risers
,”
Proceedings of the 20th International Conference on Offshore Mechanics and Arctic Engineering
, ASME OMAE2001/OFT-1272.
16.
Stahl
,
B.
, and
Banon
,
H.
,
2002
, “
Fatigue Safety Factor for Deepwater Risers
,”
Proceedings of the 21st International Conference on Offshore Mechanics and Arctic Engineering
, ASME OMAE2002-28405.
17.
Leira
,
B.
,
Meling
,
T. S.
,
Larsen
,
C.
,
Berntsen
, V
.
,
Stahl
,
B.
, and
Trim
,
A.
,
2003
, “
Assessment of Fatigue Safety Factors for Deepwater Risers in Relation to VIV
,”
Proceedings of the 22nd International Conference on Offshore Mechanics and Arctic Engineering
, ASME OMAE2003-37346.
18.
Chezhian
,
M.
,
Mork
,
K.
,
Ronaess
,
M.
,
Meling
,
T. S.
,
2005
, “
Application of DNV-RP-F204 for Determining Riser VIV Safety Factors
,”
Proceedings of the 24th International Conference on Offshore Mechanics and Arctic Engineering
, ASME OMAE2005-67021.
19.
Sigurdsson
,
G.
,
Mork
,
K.
, and
Fyrileiv
,
O.
,
2006
, “
Calibration of Safety Factors for DNV-RP-F105 Free-Spanning Pipelines
,”
Proceedings of the 25th International Conference on Offshore Mechanics and Arctic Engineering
, ASME OMAE2006-92099.
20.
Chezhian
,
M.
,
Mork
,
K.
,
Sodahl
,
N.
,
Meling
,
T. S.
, and
Leira
,
B.
,
2003
, “
Risk Based Fatigue Factor of Safety for Deepwater Risers
,”
15th Deep Offshore Technology Conference DOT
.
21.
Tognarelli
,
M.
,
Gabbai
,
R.
, and
Campbell
,
M.
,
2009
, “
An Approach to Include Observed VIV Likelihood in Drilling Riser Fatigue Analyses
,”
Proceedings of the 28th International Conference on Ocean, Offshore & Arctic Engineering
, ASME OMAE2009-79443.
22.
Det
Norske Veritas
,
2005
, “Recommended Practice: Riser Fatigue,” DNV RP-F204. Available at: http://www.dnv.com
23.
Melchers
,
R. E.
,
1987
,
Structural Reliability Analysis and Prediction
,
John Wiley and Sons
,
New York
.
You do not currently have access to this content.