May I ask if the materials for the equipment flanges can only be selected from Tables 6 and 7 on Pages 12 and 13 of 47020?
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If the material for type A flanges is S30408, then are such flanges considered non-standard?
That’s the rule (after all, different materials allow for different allowable stresses), but there are too few materials listed in the standards; I have this same problem as well. It can also be calculated using SW6 for custom designs; after selecting the appropriate specifications, the relevant dimensions can be determined, and drawings will need to be produced for custom designs. If no diagram is desired, select an appropriate standard grade after the calculation is completed.
I fully agree that necessary adaptive designs should be made based on the actual circumstances.
When selecting standard flanges, it is necessary to do so in accordance with the standard specifications. Otherwise, it is a non-standard design. Although the materials are different, the dimensions can be calculated by referring to standards.
Yes, when the materials change, it becomes a non-standard case, and one has to do the calculations themselves.
Since it does not meet the standard requirements, it should be calculated as a non-standard flange.
If the material falls outside the range of materials covered by the selected standard, it is possible to use the dimensions specified in that standard as a substitute, and then perform calculations using the parameters corresponding to the material and pressure level chosen by one’s own. Once the calculations yield satisfactory results, this standard can be adopted, with the material simply being labeled according to the chosen material.