Effects of Laying Depth and Pipe Arc Length on the Mechanical Performance of Large-Diameter Cold-Water Pipes during Float-and-Sink Installation

Author:

Wang Dongshi1,Zheng Miaozi2,Zhang Li3,Mao Zhenyu1,Tan Jian1,Zhang Yulong4ORCID,Duan Menglan1

Affiliation:

1. College of Safety and Ocean Engineering, China University of Petroleum-Beijing, Beijing 102249, China

2. State Key Laboratory of Hydroscience and Engineering, Department of Hydraulic Engineering, Tsinghua University, Beijing 100084, China

3. Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang 524005, China

4. Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China

Abstract

The successful operation of a large-diameter cold water pipeline installation is crucial for harnessing the potential of ocean thermal energy conversion. However, there is a shortage of research focused on mechanical performance analysis during installation. This study establishes a pipeline response analysis model based on a nonlinear beam theory to elucidate the underlying mechanical behaviour. Employing the method of singular perturbation, the general solution for the exterior region of the pipeline, the solution at the boundary layer, and the valid solution across the entire domain are derived. A comparison with numerical solutions is conducted to validate the accuracy and effectiveness of the theoretical model. Based on the theoretical analysis, the influence of installation depth and pipeline curvature on the pipeline’s shape, tension, curvature, and stress is discussed. The results indicate that increasing the installation depth leads to intensified pipeline bending and significant deformation, reaching a maximum bending moment of 3.92 MN∙m at a distance of 50~100 m from the bottom of the pipeline. The results also show that, as the pipeline’s arc length increases from 0 to 100 m, the bending curvature, Von Mises stress, and bending stress exhibit a trend of initial growth followed by a decline, peaking at 7.45 MPa, and 6.83 Mpa, respectively, while the actual tension and axial tension decrease initially and then increase, reaching −0.17 MN and −0.17 MPa, respectively, at the maximum arc length. The findings of this study provide valuable insights for practical cold-water pipe installation and laying.

Funder

Southern Marine Science and Engineering Guangdong Laboratory

National Natural Science Foundation of China

Publisher

MDPI AG

Subject

Ocean Engineering,Water Science and Technology,Civil and Structural Engineering

Reference21 articles.

1. Stability based approach to design cold-water pipe (CWP) for ocean thermal energy conversion (OTEC);Adiputra;Appl. Ocean Res.,2019

2. An Overview of Deepwater Pipeline Laying Technology;Li;China Ocean Eng.,2008

3. Zan, Y., Yuan, L., Huang, K., Ding, S., and Wu, Z. (2018). Numerical Simulations of Dynamic Pipeline-Vessel Response on a Deepwater S-Laying Vessel. Processes, 6.

4. Keesmaat, K. (2015). Installation Limits of Large Diameter Cold Water Pipes in Deep Water for Land-Based OTEC Plants, TU Delft.

5. Miroslav, S. (2015). (Pipe-Life) Email Conversation with Pipe-Life; Large Diameter OTEC Pipe Installation Thesis Bluerise.

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