Calculation problems for type A flat welding flanges
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When calculating type A flat welding flanges, what is the value of Di to be used: the inner diameter of the cylinder, or the inner diameter of the flange at the junction between the flange and the cylinder?
According to the nozzle model used in the calculations (see figure), whether inputting the inner diameter of the pipe flange or the container flange, the inner diameter of the cylinder (or the outer diameter of the nozzle minus 2 times the wall thickness) should be entered. You can also try calculating for a pipe flange, and finally prepare a calculation report to review the data in detail.
If the conditions are met, it can be calculated as a loose flange, with Di taken as the inner diameter of the flange; if calculated as a general-purpose flange, the inner diameter of the cylinder or pipe fitting should be used.