Ship Engineering

Stress Analysis and Flexible Design of Steam Pipeline for Ships Sailing in Ice Area

[Purpose]In view of the problems of pipeline failure caused by vibration, fatigue damage and rupture of steam pipeline system of ships sailing in ice area, the layout optimization design of the whole structure was studied at the initial stage of pipeline design. [Method]According to the stress check results of pipeline system obtained by modeling calculation, by adding natural compensation and optimizing the layout of supports and hangers, the pipeline can adapt to the complex stress and deformation environment, and reasonable adjustment of constraints to improve the stiffness of pipeline system, so as to obtain a safer and more reasonable layout scheme. [Result]After the modification, the secondary stress was reduced from 2.9 times the allowable stress value of the material to 0.7 times, in accordance with the ASME B31.3 process piping code, and the first-order natural frequency met the limit requirements of the design frequency of the engineering piping.[Conclusion]In order to ensure the safety and stability of the pipeline system under various working conditions,the flexibility and stiffness of the pipeline system are balanced, and good results are obtained, which provides reference for other types of pipeline system optimization design.