Typical Piping System Design And Support Optimization Technology Of General FPSO Based On Stress Analysis

FPSO is the base of offshore oil and gas resources development,but with the development of offshore oil and gas resources towards the deep sea and ultra deep sea,it is more and more far away from the shore base,and the increase of supply cost leads to more and more large-scale and multi-functional marine engineering products such as FPSO.In order to adapt to the development of different oil fields and different oil products,it has a multi-functional,long-life and wide sea adaptability Co MPared with the traditional FPSO,the complexity and co MPactness of its pipeline system have been significantly improved,but the safety of the whole pipeline system and the optimization of the support have higher requirements.Therefore,it is of great practical value to analyze the forces on the important piping and supports of the general FPSO,verify the rationality of the pump equipment and flange,study the vibration of the important Piping under different design forms and different combination conditions,and put forward the appropriate layout scheme based on the optimization and adjustment of the supports for the unreasonable design,so as to improve the safety performance of the whole ship.In this paper,the general FPSO of the outer high bridge The main deck fire water and ballast water pipeline system of h1468 is taken as the research object.By using CAESARII stress analysis software and using the method of additional displacement to simulate the hull deformation,the stress-strain situation of two important pipeline systems is emphatically studied.The static / dynamic analysis and calculation of the pipeline system are carried out.Based on the stress calculation results,the unreasonable parts are adjusted and optimized.The main research contents are as follows:1?This paper discusses the significance and purpose of stress analysis for the key piping system of general-purpose FPSO,analyzes the components of pipeline stress,briefly and clearly introduces each link and specific tasks of the analysis process,gives the evaluation criteria and stress check conditions of stress analysis,and introduces the combination method of working conditions in stress analysis combined with the system of required analysis.2?Guided by the pipe support of the fire water system on the main deck,the maximum span allowed for the installation of the pipe support is calculated and analyzed,the maximum span allowed for the design and installation is studied,the positioning of the support during installation is analyzed,the thermal displacement is controlled,and the accurate installation position is studied.3?Using CAESAR II pipeline analysis software has established a complete three-dimensional model of fire water and ballast water system on the main deck.According to the different layout and actual check requirements of the two pipelines,two different working condition setting methods have been constructed.The primary stress and secondary stress of the two pipelines have been analyzed perfectly,and the detailed results of pipeline displacement and constraint load have been given,and the unreasonable parts have been optimized.4?The detailed CAESAR II three-dimensional simulation method of pump equipment and flange is given,and the check form is optimized.The load and flange leakage of fire water and ballast water pipeline equipment on the main deck are checked to verify the rationality of the current design pipeline pump port and flange.5?Finally,the corresponding modal analysis and water hammer analysis are carried out for the ballast water pipeline with CAESAR II software.The causes of the formation of the pipeline with excessive vibration and the part with excessive water hammer load in the modal analysis are analyzed and optimized to improve the system safety.