| As an important transportation equipment in the exploitation of marine resources,themarine flexible pipeline is a multi-layer composite structure pipeline,and it is a “lifeline”related to the development of marine resources.The marine flexible pipe is composed of a metal layer and a polymer material layer,and has the advantages of strong design,low bending rigidity,high strength,good fatigue resistance,good corrosion resistance,and easy installation.It is widely used in offshore oil and gas exploitation processes and at sea.All stages of oil and gas transportation are particularly suitable for deep water offshore oil and gas exploration.When the liquid transported by the pipeline is at a high temperature,the properties of the material in each layer of the pipeline may change,which may lead to deformation and damage of the jacket layer and leakage of the liquid,thereby affecting the surrounding marine ecological environment.Therefore,based on the enterprise project,this paper studies the thermophysical properties of marine flexible pipe materials and their influence on mechanical behaviors,analyzes the possible damage modes of flexible pipes due to temperature changes,summarizes their failure modes,and analyzes their service reliability..Through the research of this paper,we hope to provide suggestions and references for the section design and optimization of flexible pipelines in practical projects.The content of this paper is as follows:Based on the combination of numerical simulation and simulation experiments,this paper analyzes the temperature field of flexible pipelines.First of all,it analyzes the marine engineering application environment and specifies the working conditions and loads of flexible pipelines.Secondly,according to the material of each layer of flexible pipe,the performance parameters of metal and non-metal materials such as elastic modulus,thermal conductivity,and linear expansion coefficient change with temperature are experimentally analyzed.Third,based on the differential equations of heat conduction,a flexible pipeline temperature field analysis model was established,and the ABAQUS finite element software was used as the operating platform to calculate the temperature distribution law.The thermodynamic coupling analysis was performed on the calculation model.Finally,by establishing an indoor simulation experiment and analyzing the experimental data,the temperature distribution of the flexible pipe and the law of the temperature change of thenonmetallic layer deformation are summarized to verify the rationality of the temperature field analysis model.In the project of cooperation with enterprises,the experimental results of temperature and pressure cycles of marine flexible pipelines were analyzed,and the law of elongation of flexible pipelines with temperature was obtained.It provides reference and reference for the design and analysis of flexible pipes in the future. |
