Calculation issues for opening reinforcement of SW6 pressure vessels
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Question: When performing calculations for strengthening openings in horizontal containers, after entering the data, I close that window and then run the calculation for strengthening the opening again, and it shows that the result is acceptable. And when the input data is entered, if that window is not closed and hole reinforcement is calculated directly, it will be shown that the hole reinforcement is unsatisfactory, and the calculated thickness of the shell in the reinforcement calculation sheet does not match that in the shell calculation sheet. This phenomenon does not occur in the calculations for strengthening openings in vertical vessels and towers; what is the reason for this?
Is this “shell calculation thickness” not the head? For an elliptical head, when the openings are located in the corner area or in the dome area, the shell thickness used in the reinforcement calculations for those openings is different. . . SW6 has many small bugs; the calculation sheet is sufficient, so there’s no need to worry about the details~
The “housing” here refers to a cylinder, with openings made in this cylinder
How about comparing the calculation sheets for the two cases?
"How about comparing the calculation sheets for the two cases?"
The same is true for the SW6 4.0 network version of accounting; when it is opened again, the calculation is based on the inner diameter
In the calculation sheet generated from the unprocessed input data, the outer diameter of the shell was used as if it were the inner diameter; as a result, the inner diameter became larger, and thus the calculation failed
Here is the response from the central station: This is because, in the conversion between the outer diameter and the inner diameter, the relationship between them is such that the outer diameter equals the inner diameter plus twice the nominal thickness δn; it is not the calculated thickness δ used in the formula for the mean diameter, which is why there is a difference. The difference is particularly significant under high pressure, or when the actual thickness applied differs greatly from the nominal thickness designed.