Effect of heat exchange tube center distance on tube sheet thickness
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I would like to ask my senior colleagues: for a fixed-plate heat exchanger with a diameter of 400 mm, the design parameters are as follows – the design pressure for the shell side is 0.7 MPa, the design temperature is 190°C, and the fluid involved is steam； The tube bank is designed for a pressure of 2.0 MPa and a temperature of 100°C; the fluid involved is hydrogen fluoride and hydrogen chloride. The heat exchange area is 8 m², the heat exchange tubes have a diameter of ∅25X2, a length of L=1500 mm, and the tube spacing is 32 mm. The calculated number of heat exchange tubes is approximately 72, and the calculated thickness of the tube sheet for sw6 is 72 mm. Based on my experience, I believed that the thickness of the tube sheet was too large; I thought there might be an error in the parameter input, so I checked those parameters several times. In the end, it wasn’t possible to adjust the tube spacing to 36 mm, but the thickness of the tube sheet was reduced, with the calculated thickness coming to 33 mm. Therefore, I would like to ask everyone: does the center distance between the heat exchange tubes have a significant impact on the thickness of the tube sheet? What about the temperature difference between the tube side and the shell side, and the extent to which the gasket coefficient affects the thickness of the tube sheet? Looking forward to everyone's answers, thank you so much!
There are calculation software available now; you can change the relevant parameters and give it a try to see.
The smaller the tube spacing, the greater the weakening effect on the tube sheet strength, and the lower the axial tensile stress it can withstand. Just like a board, does it have greater strength when the holes are more dense or when they are sparser? The metaphor might not be very appropriate; it’s for reference only.
I have worked on heat exchangers with that type of partial tube layout; there are fewer heat exchange tubes, so as you said this would mean sparse holes. On the other hand, the thickness of the tube sheet increases significantly
Uh, thank you:handshake