Comparative Analysis of Local Stress Checking Theory of Pressure Vessel Nozzle
This paper compares and analyzes the local stress checking methods of different pressure vessel pipe ports,takes a well-running heat exchange system as an example to analyze the load and stress of pipe ports with different checking methods.The maximum load percentage and maximum principal stress are evaluated and analyzed.Rigid simulation method easily exceeds the allowable range of load and stress.The WRC297 check method can effectively reduce the load and stress concentration of the nozzle of non-large diameter thin-walled equipment.For mouth with sensitive structural boundary conditions such as the diameter and thickness of the pipe,Nozzle Flex module integrated with CAESAR Ⅱ and input the stiffness value calculated by finite element for stress check can reflect the real load more accurately,but it is not generally applicable to engineering practice.The comparative analysis results can provide reference for the local stress check method of the pressure vessel pipe mouth.When the local stress check is performed,rigid check method can be applied first.If the stress analysis results meet the requirements,no other check methods need to be considered,and the system can be judged to run stably.If ASME requirements are not met,ANSYS or NozzlePro finite element analysis and verification should be carried out in combination with actual engineering considerations.If a large number of finite element calculations are not met,WRC297 verification method should be considered,and the stiffness value should be calculated using finite element analysis software.
万方数据
维普
