Session: 04-05-02 Subsea Structures & Equipment II

Submission Number: 174996

Investigation of the Internal Pressure Bearing Capacity of Cryogenic Composite Hoses for Offshore Liquid CO2 Transfer 

In Offshore Carbon Capture, Utilization, and Storage (OCCUS) systems, the safe transfer of liquid carbon dioxide (LCO₂) from transport vessels to offshore storage platforms represents a critical enabling step for large-scale offshore sequestration. Ship-to-platform transfer using cryogenic hoses requires that LCO₂ be maintained in a high-pressure, low-temperature state throughout operation to prevent vaporization, thereby imposing stringent demands on the pressure-bearing capacity and structural integrity of the hose. This study focuses on a double-spring-supported cryogenic composite hose dedicated to LCO₂ transport and develops a detailed multi-layer shell–solid finite element model to systematically investigate its pressure resistance characteristics and failure mechanisms under high internal pressure. The global structural response is first examined, including stress distributions within the primary load-bearing layers over a range of internal pressure conditions. Subsequently, a series of parametric analyses is conducted to elucidate the influence of key structural parameters, namely, clamping layer thickness, braided fiber modulus, and metal spring diameter, on the pressure-bearing performance of the hose. The results demonstrate that the braided-fiber clamping layer governs the pressure-induced failure under burst conditions, and that increasing its in-plane modulus and thickness, together with the use of a larger spring diameter, effectively improves the overall pressure-bearing capacity of the hose. These findings provide a clear understanding of the mechanical behavior of double-spring-supported cryogenic composite hoses under extreme internal pressure and offer theoretical support and engineering guidance for structural optimization and performance evaluation of cryogenic hoses applied in LCO₂ transfer for OCCUS operations.

Presenting Author: Zhaokuan Lu Ningbo Key Laboratory of Integrated Development and Safety Assurance for Deep-sea Energy and Resources, Ningbo Institute of Dalian University of Technology

Presenting Author Biography: Dr. Lu is affiliated with Dalian University of Technology. His research interests focus on numerical simulation and experimental studies of offshore energy transfer systems and offshore carbon sequestration.

Authors:

Fangqiu Li CNOOC Gas & Power Group, CNOOC Key Laboratory of Liquefied Natural Gas and Low-Carbon Technology
Hang Shen State Key Laboratory of Structural Analysis for Industrial Equipment, School of Mechanics and Aerospace Engineering, Dalian University of Technology
Yufeng Bu CNOOC Gas & Power Group, CNOOC Key Laboratory of Liquefied Natural Gas and Low-Carbon Technology
Xiaohui Zhang CNOOC Gas & Power Group, CNOOC Key Laboratory of Liquefied Natural Gas and Low-Carbon Technology
Houbin Mao State Key Laboratory of Structural Analysis for Industrial Equipment, School of Mechanics and Aerospace Engineering, Dalian University of Technology
Jun Yan State Key Laboratory of Structural Analysis for Industrial Equipment, School of Mechanics and Aerospace Engineering, Dalian University of Technology, Ningbo Key Laboratory of Integrated Development and Safety Assurance for Deep-sea Energy and Resources, Ningbo Institute of Dalian University of Technology
Zhaokuan Lu Ningbo Key Laboratory of Integrated Development and Safety Assurance for Deep-sea Energy and Resources, Ningbo Institute of Dalian University of Technology