Seeking help with the design of straight edges on container flanges
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Question 1: For container flanges according to the standards of NB47023, with dimensions DN2200 PN1.0 as shown in Figure A, the thickness of the butt-welded cylinder is 14; based on Appendix 3, the corrected model is (FM DN2200-1.0/112-220). I would like to ask what type of straight edge section should be used for the flange? B, C, D? Question 2: In the GB150 flange types, for the integral flange shown in Figure 7-1, when is the e type used and when is the f type used? Is it related to the flange structure in Figure 7-2 (the C-1 butt-welded flange joint type)?
Let me answer the first question: According to the standard definition, it should be thinned according to Figure C, but there is a slight issue with your diagram. You can thin it down to 17 mm; there’s no need to go down to 14 mm. Of course, if you thin it to 14 mm, I don’t think that’s a problem either.
I think none of these three options are correct. Initially, one end was 32 and the other was 14, giving a total length of 88; after extension, it’s still 32 on one end and 14 on the other, but the length becomes 108. . . . It’s a very simple thing
You’re right; I checked again and found that for NB47020, the trimming is done by adding 3 to the thickness of the cylinder.
This post was last edited by wanlirn on 2022-9-29 09:05; it fails to meet the minimum thickness requirement for the connecting cylinder, and there is a connection with the thinning and roughness – it’s a misunderstanding. . You haven’t understood the intended purpose of the standards; in simple terms, the strength of the flange itself requires additional contribution from the thickness of the cylinder, which is why the standards specify a minimum thickness for the joints. If this requirement cannot be met, the high neck is lengthened, thereby indirectly increasing the thickness of the cylinder
This post was last edited by wanlirn on 2022-9-29 09:14. Question 2: In the GB150 flange types, for the integral flange shown in Figure 7-1, when is the e type used (where the pipe fitting and the flange are integrated as one unit; this is different from a flange that is itself an integral unit – the small-diameter pipe fittings of type e are similar to those of type IF in HG20592), and when is the f type used (for larger diameters, where the pipe fitting is connected to the flange by welding; compared to type e, there is no fundamental difference other than cost)? Is it related to the flange structure in Figure 7-2 (the C-1 butt-welded flange joint type)? (No, it is not related.) You still need to know and understand the models used for flange calculations; otherwise, you will still encounter problems in other areas. . .
Thank you so much; your explanation was very detailed. Learn from seniors more*:D