The S-lay method has been widely used in pipeline installation from shallow water to deep water for decades. In this paper, a novel numerical model for analyzing pipelines in the S-lay problem is proposed to investigate the overall configuration, internal forces, and strain of the pipeline taking into account the influence of ocean currents and seabed stiffness. The influence of many important factors, including the variation position of the liftoff point, the change of stinger radius, ocean currents, seabed stiffness are investigated in detail. Some useful results are obtained: the stress state of the pipeline is found to vary greatly during the whole laying process; the train of the pipeline at both the upper and the lower sides is very important; ocean currents have negligible influence on the pipeline; traditional “touchdown factor” is not suitable to predict the real pipe embedment; and soil stiffness plays an important role in pipeline behavior on the seabed. The illustrative examples and comparison with a previous work demonstrate the widespread applicability of this model. Moreover, the solution process of this model is easy and fast, so it is suitable for engineering applications.

References

References
1.
Kashani
,
M.
, and
Young
,
R.
, 2005, “
Installation Load Consideration in Ultra-Deepwater Pipeline Sizing
,”
J. Transp. Eng.
,
131
(
8
), pp.
632
639
.
2.
Torselletti
,
E.
,
Brusci
,
R.
,
Vitali
,
L.
, and
Marchesani
,
F.
, 1999, “
Lay Challenges in Deep Waters: Technologies and Criteria
,”
Proceedings of the 2nd International Deepwater Pipeline Technology
,
Clarion Technical Conference
,
New Orleans, Louisiana
.
3.
Wasow
,
W.
, 1956, “
Singular Perturbations of Boundary Value Problems for Nonlinear Differential Equations of Second Order
,”
Pure Appl. Math.
,
9
, pp.
93
113
.
4.
Plunkett
,
R.
, 1967, “
Static Bending Stresses in Catenaries and Drill Strings
,”
J. Eng. Ind.
,
39B
(
1
), pp.
31
36
.
5.
Dixon
,
D. A.
, and
Rutledge
,
D. R.
, 1968, “
Stiffened Catenary Calculation in Pipeline Laying Problem
,”
J. Eng. Ind.
,
90B
(
1
) pp.
153
160
.
6.
Palmer
,
A. C.
,
Hutchinson
,
G.
, and
Ells
,
W. J.
, 1974, “
Configuration of Submarine Pipelines During Laying Operations
,”
J. Eng. Ind.
, pp.
1112
1118
.
7.
Zhu
,
D. S.
, and
Cheung
,
Y. K.
, 1997, “
Optimization of Buoyancy of an Articulated Stinger on Submerged Pipelines Laid With a Barge
,”
Ocean Eng.
,
24
(
4
)pp.
301
311
.
8.
Guarracino
,
F.
, and
Mallardo
,
V.
, 1999, “
A Refined Analytical Analysis of Submerged Pipelines in Seabed Laying
,”
Appl. Ocean Res.
,
21
, pp.
281
293
.
9.
Wilkins
,
J. R.
, 1970, “
Offshore Pipeline Stress Analysis
,”
Offshore technology conference
,
OTC 1227, Houston, Texas
, pp.
11
19
.
10.
Ovunc
,
B.
1982, “
Design of Offshore Pipelines
,”
J. Pipelines
,
2
(
4
), pp.
285
295
.
11.
Ovunc
,
B.
, 1982, “
Geometrical Nonlinearity in Offshore Pipelines
,”
Proceedings of the International Conference of Pipeline Design and Installation
,
Las Vegas
, pp.
336
350
.
12.
Oliver
,
J.
, and
Oñate
,
E.
, 1985, “
A Finite Element Formulation for the Analysis of Marine Pipelines During Laying Operations
,”
J. Pipelines
,
5
, pp.
15
35
.
13.
Konuk
,
I.
, 1980, “
Higher Order Approximations in Stress Analysis of Submarine Pipelines
,”
ASME J. Energy Resour. Technol.
,
102
, pp.
190
196
.
14.
Martinez
,
C. E.
, and
Goncalves
,
R.
, 2003, “
Laying Modeling of Submarine Pipelines Using Contact Elements Into a Corotational Formulation
,”
ASME J. Offshore Mech. Arct. Eng.
,
125
, pp.
145
152
.
15.
Perinet
,
D.
, and
Frazer
,
I.
, 2007, “
J-Lay and Steep S-Lay: Complementary Tools for Ultradeep Water
,”
Offshore technology conference
,
Houston, Texas, OTC 18669
, pp.
1
8
.
16.
Gu
,
Y. N.
, 1989, “
Analysis of Pipeline Behaviors During Laying Operation
,”
China Ocean Eng.
,
3
(
4
), pp.
477
486
.
17.
Kyriakides
,
S.
, and
Corona
,
E.
, 2007,
Mechanics of Offshore Pipelines: Volume 1, Buckling and Collapse
,
Elsevier Science
,
Oxford, UK
, Chapter 2.
18.
Lenci
,
S.
, and
Callegari
,
M.
, 2005, “
Simple Analytical Models for the J-Lay Problem
,”
Acta Mech.
,
178
, pp.
23
29
.
19.
Murff
,
J. D.
,
Wanger
,
D. A.
, and
Randolph
,
M. F.
, 1989, “
Pipe Penetration in Cohesive Soil
,”
Geotechnique
,
39
(
2
), pp.
213
229
.
20.
Aubeny
,
C. P.
, and
Dunlap
,
W. A.
, 2003, “
Penetration of Cylindrical Objects in Soft Mud
,”
Proc. IEEE Oceans
, pp.
2068
2073
.
21.
Bridge
,
C.
,
Laver
,
K.
,
Clukey
,
E.
, and
Evans
,
T.
2004, “
Steel Catenary Riser Touchdown Point Vertical Interaction Models
,”
Offshore Technology Conference
,
OTC, 16628
, pp.
1
8
.
22.
Aubeny
,
C. P.
,
Shi
,
H.
, and
Murff
,
J. D.
, 2005, “
Collapse Loads for a Cylinder Embedded in Trench in Cohesive Soil
,”
Int. J. Geomech.
,
5
(
4
), pp.
320
325
.
23.
Merifield
,
R.
,
White
,
D. J.
, and
Randolph
,
M. F.
, 2008, “
The Ultimate Undrained Resistance of Partially Embedded Pipelines
,”
Geotechnique
,
58
(
6
), pp.
461
470
.
24.
Moussalli
,
A. H.
, 1981,
Offshore Pipeline Design, Analysis, and Methods
,
Pennwell Corporation
,
Tulsa, OK
, Chapter 3.
25.
Berteaux
,
H. O.
, 1976,
Buoy Engineering
,
New York
,
John Wiley and Sons
, pp.
104
105
.
26.
Wilson
,
B. W.
, 1960, “
Characteristics of Anchor Cables in Uniform Ocean Currents
,” Agricultural and Mechanical College of Texas, Tech. Rep. No. 204-1.
27.
Callegari
,
M.
,
Lenci
,
S.
,
Torselletti
,
E.
, and
Vitali
,
L.
, 2003, “
Dynamic Models of Marine Pipelines for Installation in Deep and Ultra-Deep Waters: Analytical and Numerical Approaches
,”
16th AIMETA Congress of Theoretical and Applied Mechanics
,
1
12
28.
Palmer
,
A. C.
, 2008, “
Touchdown Indention of the Seabed
,”
Appl. Ocean Res.
,
30
, pp.
235
238
.
29.
Palmer
,
A. C.
, and
King
,
R. A.
, 2008,
Subsea Pipeline Engineering
,
Pennwell Corporation
,
Tulsa, OK
, Chapter 14.
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