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Research Papers: Piper and Riser Technology

The Model Test of Deep Water S-Lay Stinger Using Dynamical Substructure Method

[+] Author and Article Information
Xiangfeng Zhang

State Key Laboratory of Structural Analysis
and Industrial Equipment,
Dalian University of Technology,
Dalian 116024, China
Geophysical Department Subsea Engineering
and Technical Center,
China Oilfield Services Limited,
Tianjin 300452, China
e-mail: zxfdut@outlook.com

Qianjin Yue

State Key Laboratory of Structural Analysis
and Industrial Equipment,
Dean of School of Ocean
Science and Technology,
Dalian University of Technology,
Dalian 116024, China
e-mail: yueqj@dlut.edu.cn

Wenshou Zhang

State Key Laboratory of Structural Analysis
and Industrial Equipment,
Dalian University of Technology,
Dalian 116024, China
e-mail: wszhang@dlut.edu.cn

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received August 13, 2013; final manuscript received October 15, 2014; published online November 17, 2014. Assoc. Editor: Longbin Tao.

J. Offshore Mech. Arct. Eng 137(1), 011701 (Feb 01, 2015) (8 pages) Paper No: OMAE-13-1076; doi: 10.1115/1.4028879 History: Received August 13, 2013; Revised October 15, 2014; Online November 17, 2014

Deep water pipeline installations by S-lay present many challenges, especially in the overbend section. The S-lay requires a long curved and stiff stinger to support the pipeline weight. The interaction between the overbend pipe and stinger is complicated such that the numerical structure analysis could not sufficiently predict the mechanical behavior of the installing process. A dynamic substructure model test method with 1:20 length scale for 2000 m water depth is addressed in this paper, where the large scale model structure can be tested to simulate the vessel movements during installation. The roller forces influenced by the stinger stiffness and vessel movements are discussed based on the test platform.

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Figures

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Fig. 7

The principle of the substructure simulation platform

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Fig. 11

Static roller loads

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Fig. 12

Partial cycles of hull motions: (a) Heave, (b) roll, and (c) pitch

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Fig. 13

Dynamic roller loads for different roller locations: (a) roller 2, (b) roller 5, and (c) roller 8

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Fig. 14

Dynamic roller loads for different wave approach angles: (a) 0 deg, (b) 45 deg, and (c) 90 deg

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Fig. 15

The impact of stinger structural rigidity on roller contact states

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Fig. 16

The ΔRd envelope

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Fig. 6

Variations of roller forces with ν

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Fig. 5

Concentrated roller loads

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Fig. 4

Finite element model of stinger

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Fig. 3

Mechanical model of the stinger in substructure 2

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Fig. 2

Substructures and the overbend section

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Fig. 8

Substructure models: (a) stinger and overbend model, (b) sagbend model, and (c) pipelay vessel model

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Fig. 9

The pup piece and the roller arrangement

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