Problems with the tube sheet and vessel flanges of U-tube heat exchangers
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I was working on my graduation project and chose a U-tube heat exchanger, with flange-clamped tube sheets, which also makes it easier to remove the tube bundle. However, while drawing the diagrams, I realized that the outer diameter of my tube sheet was larger than diameter D1, which is the diameter at the midpoint of the flange bolts. If that’s the case, how can the two flanges be bolted together? My tube side pressure is 1.6 MPa and the shell side pressure is 4 MPa. The inner diameter of the shell is 400. Both the flanges and the tube sheet were selected according to the heat exchanger manual. Given the inner diameter and pressure, how could such a situation occur? What should I do now? Can I use flanges with an inner diameter that is one size larger? Help, help! The submission is due soon
What is the pressure rating of the shell side tube flange? Is it 4.0 MPa? ~~~Tube sheet pressure rating?
Yes, I selected the flanges based on a shell-side pressure of 4 MPa
This is the tube sheet size table for 4mpa/1.6mpa
This is the 4mpa flange size table
It can be seen that the outer diameter of the tube sheet, 540, completely covers the diameter of the bolt centerline of the flange, which is 515. . . . . . . .
Was the container flange specification chosen incorrectly? The flanges at both ends of the U-tube heat exchanger are concave flanges. The diameter of the tube sheet is generally calculated based on the size of the accompanying flanges, rather than being selected arbitrarily. Tube sheet diameter = Container flange D3 (outer diameter of the sealing surface) - 3mm
I’m following the heat exchanger design manual, which contains a table showing the dimensions of tube sheets made of ordinary low-carbon steel that do not require strength verification. Using the diagram I sent earlier, can I simply reduce the outer diameter of the tube sheet? Do I need to re-check the tube sheet?
The tube sheet dimensions that were specified directly in the past are now outdated and may be overly conservative; it is recommended to recalculate them using SW6.
I haven’t used any similar heat exchanger calculation software before. I saw on forums that SW’6 requires a password token or something; could you share the relevant resources?
Doing a graduation project is a process of becoming familiar with standards. It is recommended to take a closer look at 151.