In this paper, a methodology suitable for assessing the allowable sea states for installation of a transition piece (TP) onto a monopile (MP) foundation with focus on the docking operation is proposed. The TP installation procedure together with numerical analyses is used to identify critical and restricting events and their corresponding limiting parameters. For critical installation phases, existing numerical solutions based on frequency and time domain (TD) analyses of stationary processes are combined to quickly assess characteristic values of dynamic responses of limiting parameters for any given sea state. These results are compared against (nonlinear and nonstationary) time domain simulations of the actual docking operations. It is found that a critical event is the structural damage of the TP's bracket supports due to the potential large impact forces or velocities, and a restricting installation event (not critical) is the unsuccessful mating operation due to large horizontal motions of the TP bottom. By comparing characteristic values of dynamic responses with their allowable limits, the allowable sea states are established. Contact–impact problems are addressed in terms of assumed allowable impact velocities of the colliding objects. A possible automatic motion compensation system and human actions are not modeled. This methodology can also be used in connection with other mating operations such as float-over and topside installation.

References

References
1.
Thomsen
,
K. E.
,
2014
,
Offshore Wind—A Comprehensive Guide to Successful Offshore Wind Farm Installation
,
Elsevier
,
London
, Chap. 5.
2.
DNV
,
2014
, “
Offshore Standard DNV-OS-H205, Lifting Operations
,” Det Norske Veritas, Oslo, Norway.
3.
Clauss
,
G.
, and
Riekert
,
T.
,
1990
, “
Operational Limitations of Offshore Crane Vessels
,”
Offshore Technology Conference
(OTC), Houston, TX, May 7–10, SPE Paper No.
OTC-6217-MS
.https://doi.org/10.4043/6217-MS
4.
Nojiri
,
N.
, and
Sasaki
,
T.
,
1983
, “
Motion Characteristics of Crane Vessels in Lifting Operations
,”
Offshore Technology Conference
(OTC), Houston, TX, May 2–5, SPE Paper No.
OTC-4603-MS
.https://doi.org/10.4043/4603-MS
5.
Cozijn
,
J.
,
van der Wal
,
R.
, and
Dunlop
,
C.
,
2008
, “
Model Testing and Complex Numerical Simulations for Offshore Installation
,”
18th International Offshore and Polar Engineering Conference
, Vancouver, BC, Canada, July 6–11, SPE Paper No.
ISOPE-I-08-080
.https://www.onepetro.org/conference-paper/ISOPE-I-08-080
6.
Jung
,
J. J.
,
Lee
,
W. S.
,
Shin
,
H. S.
, and
Kim
,
Y.
,
2009
, “
Evaluating the Impact Load on the Offshore Platform During Float-Over Topside Installation
,”
19th International Offshore and Polar Engineering Conference
, Osaka, Japan, June 21–26, SPE Paper No.
ISOPE-I-09-330
.https://www.onepetro.org/conference-paper/ISOPE-I-09-330
7.
He
,
M.
,
Yuan
,
R.
,
Li
,
H.
,
Yu
,
W.
,
Qian
,
J.
, and
Wang
,
A. M.
,
2011
, “
Floatover Installation Analysis and Its Application in Boahi Bay
,”
21st International Offshore and Polar Engineering Conference
, Maui, HI, June 19–24, SPE Paper No.
ISOPE-I-11-292
.https://www.onepetro.org/conference-paper/ISOPE-I-11-292
8.
Peace
,
D.
,
Tuturea
,
D.
,
Ellis
,
N.
, and
Chivvis
,
J.
,
1985
, “
Dynamic Analysis of the Hutton TLP Mating Operation
,”
Offshore Technology Conference
(OTC), Houston, TX, May 6–9, SPE Paper No.
OTC-5048-MS.
https://doi.org/10.4043/5048-MS
9.
Hamilton
,
J.
,
French
,
R.
, and
Rawstron
,
P.
,
2008
, “
Topsides and Jackets Modeling for Floatover Installation Design
,”
Offshore Technology Conference
(OTC), Houston, TX, May 5–8, SPE Paper No.
OTC-19227-MS
. https://doi.org/10.4043/19227-MS
10.
Guachamin Acero
,
W.
,
Li
,
L.
,
Gao
,
Z.
, and
Moan
,
T.
,
2016
, “
Methodology for Assessment of the Operational Limits and Operability of Marine Operations
,”
Ocean Eng.
,
125
, pp.
308
327
.
11.
Li
,
L.
,
Guachamin Acero
,
W.
,
Gao
,
Z.
, and
Moan
,
T.
,
2016
, “
Assessment of Allowable Sea States During Installation of OWT Monopiles With Shallow Penetration in the Seabed
,”
ASME J. Offshore Mech. Arct. Eng.
,
138
(
4
), p.
041902
.
12.
Guachamin Acero
,
W.
,
Gao
,
Z.
, and
Moan
,
T.
,
2016
, “
Assessment of the Dynamic Responses and Allowable Sea States for a Novel Offshore Wind Turbine Installation Concept Based on the Inverted Pendulum Principle
,”
Energy Procedia
,
94
, pp.
61
71
.
13.
Guachamin Acero
,
W.
,
Gao
,
Z.
, and
Moan
,
T.
,
2017
, “
Numerical Study of a Novel Procedure for Installing the Tower and Rotor Nacelle Assembly of Offshore Wind Turbines Based on the Inverted Pendulum Principle
,”
J. Marine Sci. Appl.
, (in press).
14.
Guachamin Acero
,
W.
,
Moan
,
T.
, and
Gao
,
Z.
,
2015
, “
Steady State Motion Analysis of an Offshore Wind Turbine Transition Piece During Installation Based on Outcrossing of the Motion Limit State
,”
ASME
Paper No. OMAE2015-41142.
15.
ISO
,
2015
, “
Ships and Marine Technology—Offshore Wind Energy-Port and Marine Operations
,” International Organization for Standardization, Geneva, Switzerland, Standard No.
ISO 29400
.https://www.iso.org/standard/60906.html
16.
Century Dynamics-Ansys
,
2011
, “
AQWA Reference Manual Version 14.0
,” Century Dynamics-Ansys, Inc., Horsham, UK.
17.
Lankhorst
,
2015
, “
Offshore Steel Wire Ropes
,” Royal Lankhorst Euronete, Sneek, The Netherlands, accessed Nov. 29, 2015, http://www.lankhorstropes.com/files/uploads/Offshore/brochures/Steel_Wire_Rope_brochure__100dpi__April_2013.pdf
18.
Jung
,
S.
,
Kim
,
S. R.
,
Patil
,
A.
, and
Hung
,
L. C.
,
2015
, “
Effect of Monopile Foundation Modeling on the Structural Response of a 5-MW Offshore Wind Turbine Tower
,”
Ocean Eng.
,
109
, pp.
479
488
.
19.
Hoit
,
M.
,
Chung
,
J. H.
,
Wasman
,
S. J.
, and
Bollmann
,
H. T.
,
2007
, “
Development of API Soil Models for Studying Soil-Pile Interaction Analysis Using FB-MultiPier
,” Bridge Software Institute, University of Florida, Gainesville, FL.
20.
API
,
2000
, “
Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms-Working Stress Design
,” American Petroleum Institute, Washington, DC, Standard No.
API-RP-2A-WSD
.http://latorebondeng90245.tripod.com/api_rp2a.pdf
21.
Fylling
,
I.
,
1994
, “
On the Statistics of Impact Velocities and Hit Positions Related to Collisions and Mating Operations for Offshore Structures
,”
BOSS'94, Behaviour of Offshore Structures
,
C.
Chryssostomidis
,
M. S.
Triantafyllow
,
A. J.
Whittle
, and
M. S.
Hoo Fatt
, eds., Elsevier,
Boston, MA
, Vol.
3
, pp.
297
306
.
22.
Sandvik
,
P. C.
,
2012
, “
Estimation of Extreme Response From Operations Involving Transients
,” Second Marine Operations Specialty Symposium (
MOSS
), Singapore, Aug. 6–8, pp. 103–112.
23.
Low
,
Y. M.
,
2009
, “
Efficient Vector Outcrossing Analysis of the Excursion of a Moored Vessel
,”
Probab. Eng. Mech.
,
24
(
4
), pp.
565
576
.
24.
DNV
,
2010
, “
Environmental Conditions and Environmental Loads
,” Det Norske Veritas, Oslo, Norway, Recommended Practice DNV-RP-C205.
25.
DNV
,
2011
, “
Modelling and Analysis of Marine Operations
,” Det Norske Veritas, Oslo, Norway, Recommended Practice DNV-RP-H103.
26.
Hamilton
,
J.
, and
Ramzan
,
F.
,
1991
, “
Dynamic Analysis of Offshore Heavy Lifts
,”
The First International Offshore and Polar Engineering Conference
, Edinburgh, UK, Aug. 11–16, Vol.
1
, SPE Paper No.
ISOPE-I-91-004
.https://www.onepetro.org/conference-paper/ISOPE-I-91-004
You do not currently have access to this content.