Please help me! What should I do if the flange stress is less than the allowable stress of the shell flange?
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Regarding the problem that the extended part of the tube plate doubles as a flange, the fixed tube plate heat exchanger (P80) is calculated according to GB151-2014. The flange stress calculated in the last step is greater than 3 times the allowable stress of the shell flange. I am a novice. I calculated the thickness of the tube plate alone for more than 30 pages. I feel that I am too stupid. Please help me! I also want to know whether the material of the tube sheet is the same as that of the cylinder, or is it selected according to the forging material given by the standard flange JBT4700? When the shell side Ps=0.88Mpa, Pt=0, with or without thermal expansion, there was no problem in stress verification. Then, the shell side Ps=0, Pt=0.55, with or without thermal expansion, the verification failed.
Sorry to bother everyone, the problem has been solved. The poster is blind and missed a 0. He needs to think about glasses. I'm so happy. I'm so happy.