How is the long-diameter flange of pressure vessel equipment flanges thinned out using the dashed line?

Based on the information you provided, we can give the following answer: The method of thinning the long-diameter flange of the pressure vessel equipment flange as shown in Figure 1, using the dashed line as a guide, involves thinning a straight section of the flange along the contour indicated by the dashed line. Specifically, the straight portion of the flange is cut and processed multiple times to gradually narrow it down, eventually forming a shape identical to the dashed-line contour. This thinning method is different from the thinning of type B flanges at a slope of 1:3; in the latter case, the flat areas on the flange surface are thinned at a certain slope in order to reduce weight, lower costs, and improve performance. Therefore, in the flanges of pressure vessel equipment, the long-diameter flanges are thinned by means of a dashed line, which involves thinning the straight parts of the flange rather than creating beveled surfaces on the planar areas of the flange ends. .

This post was last edited by qqsbig001 on 2023-6-6 12:21. Is this correct? ≤Thin to a difference of 3 mm at a ratio of 1:3, then bevel at 30°.

I think that’s the way to do it; we thin it out in the same manner. Figure 1 shows thinning through machining, while Figure 2 depicts a smooth transition achieved through welding, which is somewhat similar to \"cladding\" – in other words, making the thin-walled end thicker by \"welding it together\". However, it’s advisable to make the thickness reduction even smaller than the required 1:3 ratio; in other words, reduce the thickness further. Otherwise, the result after welding won’t look good, as there will still be excessive deformation.

This post was last edited by Wen Bing on 2023-6-8 at 13:41. Is there a definitive conclusion?