Discussion on the feasibility of the flange part also serving as the head
Thread Content
Good morning, teachers. I am opening a discussion thread to discuss the following issue.: I have a tapered head with a half taper angle of 60°. According to standard requirements, its small end should be brought here. Now the user needs to set the flange under the cone head. Please tell me, can I use the lower flange to double as the small end hem of the tapered head? The structure is shown in the figure. If feasible, what should be paid attention to when issuing a calculation sheet at this time? Are there standard terms that can be relied upon? If not feasible, how would you deal with such a need? Thanks
Personally, I think that if it is designed according to 150, the structure can only undergo stress analysis. For structures that do not comply with 150.3, only stress analysis can be performed.
There is another question about this structure. Does the cone need a reinforced section of the barrel? It is obvious that the thickness of your cylinder is lower than the thickness of the cone.
I personally think: In fact, this structure is that the flange also serves as the folding edge of the small end of the head. The premise is that the head and flange must be fully welded. When the calculation sheet is actually issued, the head part must be calculated according to 150.3 to pass. Some of my colleagues do believe that this structure does not comply with the provisions of 150.3 and requires analysis and design. But think about it from another angle: For example, I have a cone head with a half cone angle of 60°, a diameter of 1000mm at the big end, and a diameter of 50mm at the small end. The head manufacturer will definitely not be able to do this. We can only make the cone head in two halves, for example, the big end is 1000 and the small end is 200 in one piece, the big end is 200 and the small end is 50 in one piece, and then butt weld together. If it is strictly stuck at 150.3, does it also require analysis and design?
It is possible to make a cone in sections, which is equivalent to making a ring seam. How does this not comply with 150.3? Your company's cones cannot be spliced?
Now that you plan to use a flange and a small-end cylinder, have you considered deformation coordination? Just like a flat-end head, the side in contact with the medium is processed into an elliptical head shape or a spherical head shape, and the thickness of the flat cover can form a complete convex head wall thickness. Can the thickness be calculated based on the convex head?
The above is just the personal opinion of a draftsman who does not know ANSYS. He often encounters medium and high voltage equipment and is very timid.
If you must use a flange, it is recommended to make a butt structure, which will bear better stress.