temperature and gravity loads while working.Besides
the components in the system are under mutual influence and restriction.So it's hard to analysis the stress of different parts in the system with the method of the traditional mechanics of materials and structural mechanics.ANSYS software is used to analysis the structural strength of the top inlet pipe for the LNG storage tank.The deformation and the stress of the top inlet pipe enduing pressure
gravity and temperature stress are got.Based on this
the arrangement of the top inlet pipe is adjust.The result of the research shows that:The maximum principal stress of the optimized design of the top inlet pipe is less than that of the original design of the maximum principal stress of the top inlet pipe 1/6
which greatly ensure the safety of storage tank in use process.