ASME B16.5 design confirmation
ASME B16.5 design confirmation
(OP)
Sorry If I sound like a bit of a newbie here this is not really my line of expertise.
Is this slip-on flange design correct for a NPS20 inch pipe holding 1300 psi?
Regards,
RM
Is this slip-on flange design correct for a NPS20 inch pipe holding 1300 psi?
Regards,
RM





RE: ASME B16.5 design confirmation
B) I doubt I would use any slip-on flange at that pressure.
Regards,
Mike
RE: ASME B16.5 design confirmation
A) Its ambient temperature around 25C.
B) Could you elaborate why you wouldnt use it, and why would it be your first choice?
About that I also have a question on the standard that might be related, the copy I have says "slip on welding(NPS 1/2 to 2 1/2 only)" (right below the drawing on page 90)
But then they go ahead and give dimensions for them on all sizes, so its contradicting or I misunderstand.
Again thanks so much for the input.
RE: ASME B16.5 design confirmation
Could you elaborate why you wouldnt use it, what whould you use and why would it be your first choice?
RE: ASME B16.5 design confirmation
For a slip-on flange the welds will be two fillet welds (corner joints) and they would probably be rather large. The stress concentrations are not especially desirable. They are hard to NDE. I would more likely use a weld-neck flange and butt weld it. This weld can be x-rayed.
Regards,
Mike
RE: ASME B16.5 design confirmation
1) Thats very weird, in mine it seems to be pretty clear (see attached) but why would they give you the dimensions then.
2) yes I guess being able to x-ray it is a big plus.
Setting that aside for a bit did I use the standard correctly?
I mean ambient temperature+1300 psi+ASTM A516 gr 65+NPS20 gives you that flange?
I just want to make sure that if need be I can use the same process to use a weld-neck flange and be confident I'm doing it right.
Regards,
RM
RE: ASME B16.5 design confirmation
RE: ASME B16.5 design confirmation
2) Yeah, I'd say you read it right. Material, temperature, read off a pressure.
Good luck,
Mike
RE: ASME B16.5 design confirmation
RE: ASME B16.5 design confirmation
Depending on your contract date, you'll probably have to stick to B16.5-2009.
RE: ASME B16.5 design confirmation
RE: ASME B16.5 design confirmation
RE: ASME B16.5 design confirmation
The material specified on your drawing is ASTM A516 Gr. 65. This is a plate material.
Plate material is only allowed for blind flanges and reducing flanges without hubs. Please read the following sections in ASME B16.5:
Paragraph 1.1(b)
Note (b) in Table 1A
Paragraph 5.1
RE: ASME B16.5 design confirmation