Reducing flange ASME B16.5 used with ASME B31.3 design
Reducing flange ASME B16.5 used with ASME B31.3 design
(OP)
Hi,
I see that the reducing flange are allowed according to ASME B16.5. for example you can have a face of 10'' Class 150 and a hub of 2''. But i'm wondering if it's allowed to be used with design according to ASME B31.3. I think stress analysis should be made. What are your thoughts ?
I see that the reducing flange are allowed according to ASME B16.5. for example you can have a face of 10'' Class 150 and a hub of 2''. But i'm wondering if it's allowed to be used with design according to ASME B31.3. I think stress analysis should be made. What are your thoughts ?





RE: Reducing flange ASME B16.5 used with ASME B31.3 design
RE: Reducing flange ASME B16.5 used with ASME B31.3 design
Table 326.1 allows to use those component as standard flange covered by ASME B16.5.But in reallity we knows that flange with face of 10'' and socket weld hub of 2'' can't be used as such. a huge stress on the hub !! How this could be accepted by B31.3 ?
RE: Reducing flange ASME B16.5 used with ASME B31.3 design
RE: Reducing flange ASME B16.5 used with ASME B31.3 design
RE: Reducing flange ASME B16.5 used with ASME B31.3 design
I agree with moltenmetal's comments (unless your case requires some special consideration). Can you explain how abnormal stress is induced on the hub?
RE: Reducing flange ASME B16.5 used with ASME B31.3 design
RE: Reducing flange ASME B16.5 used with ASME B31.3 design
RE: Reducing flange ASME B16.5 used with ASME B31.3 design
You asked if this practice (a 10x2 reduction using a hubbed reducing or even a blind flange) was permitted per B16.5 and B31.3 without special additional analysis, and the answer is yes. You are of course free to go beyond code in this and in all other respects if you don't think code-permitted fabrication is up to your particular task.