Tube sheet thickness calculation problem
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Hello teachers, today I raised an actual problem. The tube-sheet connection method is. When calculating the tube-sheet strength through SW6, a fixed tube-sheet heat exchanger is used for strength calculation. The selected tube-sheet structure is Type B. Then the calculated thickness is about 130mm. The thickness is very different from the original drawing (235mm in the original drawing) ； For this reason, I calculated the strength of the tube sheet as a flat cover, and selected 7 as the flat cover type. The calculated thickness is about 180mm. It stands to reason that with the weakening of the tube plate opening strength, the thickness should be about 200mm. So there should be something wrong with the first method, and what is wrong with it? Can the thickness of the tube sheet be selected according to the first method? Please give me some advice! I found an article online indicating that there are indeed some problems with SW6 calculations. The link is as follows: https://wenku.baidu.com/view/474f090b79563c1ec5da71f3.html?_wkts_=1673229608959&bdQuery=%E7%AE%A1%E6%9D%BF%E4%B8%8D%E5%85%BC%E5%81%9A%E6%B3%95%E5%85%B0
The heat exchanger tube sheet has great potential. The tube sheet calculation method of GB/T 151 is the most advanced. As long as the parameter input of SW6 is correct, the calculation result is credible. The conclusion of the article you linked not only states that the 151 method is more reasonable and accurate, but also says that the results of TEMA should prevail. These individuals are too conservative.
The support effect of the heat exchange tubes on the tube sheet is far greater than the weakening of the openings. Check the input data and if there is no problem, you have to believe GB151
Okay, I really believed in SW6 before, but the calculated difference between this picture and the original picture is too big, which makes me confused.
The mechanical models of flat cover and fixed tube sheet are completely different. Fixed tube sheet cannot be calculated as flat cover.