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Research Papers: Piper and Riser Technology

Modeling Approach of Hydropneumatic Tensioner for Top-Tensioned Riser

[+] Author and Article Information
Baiquan Chen

State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 300350, China;
Collaborative Innovation Center for
Advanced Ship and Deep-Sea Exploration,
Shanghai Jiaotong University,
Shanghai 200240, China
e-mail: cbq_tju@163.com

Jianxing Yu

State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 300350, China;
Collaborative Innovation Center for Advanced
Ship and Deep-Sea Exploration,
Shanghai Jiaotong University,
Shanghai 200240, China
e-mail: yjx2000@tju.edu.cn

Yang Yu

State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 300350, China;
Collaborative Innovation Center for Advanced
Ship and Deep-Sea Exploration,
Shanghai Jiaotong University,
Shanghai 200240, China
e-mail: yang.yu@tju.edu.cn

Lixin Xu

State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 300350, China
e-mail: lixin.xu@tju.edu.cn

Han Wu

State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 300350, China
e-mail: wuhan@imech.ac.cn

Zhenmian Li

State Key Laboratory of Hydraulic Engineering
Simulation and Safety,
Tianjin University,
Tianjin 300350, China
e-mail: lizhenmian@tju.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 January 22, 2018; final manuscript received May 6, 2018; published online May 28, 2018. Assoc. Editor: Theodoro Antoun Netto.

J. Offshore Mech. Arct. Eng 140(5), 051706 (May 28, 2018) (10 pages) Paper No: OMAE-18-1010; doi: 10.1115/1.4040241 History: Received January 22, 2018; Revised May 06, 2018

A three-dimensional (3D) finite element analysis (FEA) model of top-tensioned riser (TTR) with hydropneumatic tensioner is proposed in this work. First, the tension calculation equation of the hydropneumatic system is derived, and the kinematic relationship of the platform–tensioner–riser system is established. Second, a 3D FEA model is established based on the FEA code ABAQUS, considering the actual riser string configuration and the Christmas tree. At last, four kinds of tensioner models, i.e., a constant vertical tension model, a conventional simplified model, a linear spring–damper model, and a nonlinear spring–damper model, are compared and analyzed in this study. Results show that the constant vertical tension model is not recommended as it cannot reflect the actual tension in the tensioner and the response of the TTR. The conventional simplified model indeed overestimates the tension of tensioner and may lead to inaccurate estimation results of the TTR response. The linear model is applicable when the environmental condition is relatively mild, but it is strongly recommended to use the nonlinear model especially in harsher environmental conditions.

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References

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Figures

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Fig. 4

Schematic of hydropneumatic cylinder

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Fig. 3

Schematic of hydropneumatic system

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Fig. 2

Schematic of DAT system

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Fig. 1

Stack-up of a production TTR

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Fig. 5

Schematic of the relationship of the platform–tensioner–riser system

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Fig. 10

Maximum tension distribution along TTR: (a) condition A, (b) condition B, and (c) condition C

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Fig. 6

Comparison of numerical and experimental RES

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Fig. 7

Influence of the gas constant

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Fig. 8

Vertical tension and piston stroke relation

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Fig. 9

Vertical tension time history of tensioner: (a) condition A, (b) condition B, and (c) condition C

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Fig. 11

Maximum bending moment distribution along TTR: (a) condition A, (b) condition B, and (c) condition C

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Fig. 12

Maximum lateral displacement distribution along TTR: (a) condition A, (b) condition B, and (c) condition C

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Fig. 13

Vertical displacement time history of TTR center: (a) condition A, (b) condition B, and (c) condition C

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