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Metric dimension of ASME16.5 flanges

Metric dimension of ASME16.5 flanges

Metric dimension of ASME16.5 flanges

(OP)

According to ASME 16.5, 2003 Edition, Metric dimension of raised face thickmess of class 150 and 300 pipe flange is 2mm(0.06in).  0.06in is 1.524mm to be exact.

If the flange were fabricated by 1.6mm th, is that out of specification ?

Why did ASME revise B16.5 to round off decimal place ?

RE: Metric dimension of ASME16.5 flanges

litbark,
The only thing to matter, is the ASME B16.5 stamp on the flange rim and the faricator's stamp. I'm pretty sure they (the Code writers) didn't intend to upset me or you with the rounding up to 2 mm in the Code. However, the face thickness should not be less than 0.06" or 1.524mm, or in excess of 2 mm. Anything in between is acceptable, due to the manufacturing tolerances and because of the Code disclaimer which doesn't allow the conversion from inch to millimeters.
cheers,
gr2vessels

RE: Metric dimension of ASME16.5 flanges

I do not know if it is in B16.5 but I know the BPVC has an appendix which explains some of the logic in the conversions.  I also found a document with respect to the conversions used in B16.5.  I do not recall where I put it considering it was probably 2 years ago.  It probably came from ASME.

RE: Metric dimension of ASME16.5 flanges

Keep in mind that the raised face dimension is not a requirement. From B16.5 2003 Fig 7: 2mm raised face regularyly furnished on Classes 150 and 300 unless otherwise ordered. The thickness of the flange, tf, is fixed. The raised face can vary. Unless the connecting piping is rigid, a half of a millimeter here or there should not be a big deal.

jt

RE: Metric dimension of ASME16.5 flanges

For old pressure vessel, I used to see the field machining work at raised face of manholes. The remaining raised face thickness could be less than 0.06". However, the plant can continue operation without any problem.

Hope, this is related to your subject.

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