Some parameters entered for the SW6 tube sheet calculation are not supposed to be less than or equal to zero; please check the input data
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I am working on a single-pass heat exchanger. When using the SW6 software for tube sheet calculations, it keeps indicating that certain parameters, which should not be less than or equal to zero, have been entered; please check the input data. I’m wondering which one I didn’t enter?
Thank you so much; I initially thought this didn’t need to be filled in. It has been successfully verified now
Excuse me, sir – why is this schematic in the calculation sheet shown as a two-pipe design? Is this normal?
This post was last edited by tangzhenguo on 2021-6-1 08:51. Since there are slots in the tube sheet and shell side, it is necessary to enter the \"area at the tube sheet partition\", which cannot be 0
You already said it’s a simplified diagram... there’s no need to worry about it
The difference between the thickness of the tube sheet and that of the tube sheet flange also needs to be entered, as this value affects the thickness of the tube sheet.
This post was last edited by Dianxiaoer on 2021-6-3 at 10:05. 1. It is a single-pass heat exchanger without partition grooves between passes; therefore, the area at the partition point of the tube sheet is 0, so it should not be filled in. The depth of the partition grooves on the tube side of the tube sheet is also 0, so it should not be filled in either. 2. In your screenshot, the nominal thickness of the tube sheet is 74 mm, and the material used for the tube sheet is sheet metal; note that it should be Q345R (normalized). It is recommended to use forged materials instead. 3. The type of tube sheet used here is one where the extended portion also serves as a flange. In this case, the difference in thickness between the tube sheet and its flange is not 0, so this value should be filled in. Typically, 3 mm is used as this value. 4. A welding length of 1.5 mm for the heat exchange tubes and the tube sheet is inappropriate; the welding length should be at least 2 mm greater than the wall thickness of the heat exchange tubes. 5. The equivalent length for pressure-induced instability of the heat exchange tubes should be calculated based on the spacing between the baffle plates. Attention should also be paid to the unsupported spans between the baffle plates or support plates, as well as the minimum thickness of the baffle plates
The welding length between the heat exchange tube and the tube sheet is generally taken as the length at the intersection of the heat exchange tube and the weld, where this length is parallel to the axial force of the heat exchange tube; it should not be less than δt. The length by which the heat exchange tube extends outward should not be used as this value