UG-36(g) vs. B16.9 - Eccentric Reducer Section
UG-36(g) vs. B16.9 - Eccentric Reducer Section
(OP)
I want to use a 48" X 36" eccentric reducer as part of a pressure vessel. The reducer conforms to ASME B16.9 (according to vendor; I don't have it), but it does not appear to be in compliance with Section VIII Div 1 UG-36(g)(2). The α on this reducer is well over 30 degrees.
I attached a screenshot of what my plan was.
Has anyone run into this before? I know Section VIII has the final say, but why is it more stringent than the B16.9 spec? Can I make this work? If not, any suggestions for an alternative?
Thanks!
I attached a screenshot of what my plan was.
Has anyone run into this before? I know Section VIII has the final say, but why is it more stringent than the B16.9 spec? Can I make this work? If not, any suggestions for an alternative?
Thanks!





RE: UG-36(g) vs. B16.9 - Eccentric Reducer Section
In that case the reducer may not be used under UG-44. It must meet the rules for reducer sections in UG-36(e) and (f) if applicable.
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: UG-36(g) vs. B16.9 - Eccentric Reducer Section
Thank you for looking that up! To be more specific, the catalog I'm looking at designates that this reducer is "in accordance with B16.9. Special Fittings paragraph 4.4.2."
Does the 2003 version have that, or has it perhaps been added since then?
RE: UG-36(g) vs. B16.9 - Eccentric Reducer Section
Section 4 is all about marking requirements, and with the supplementary designations called up in para 4.4.2 for special fittings. You would need to confirm that the fitting would indeed be marked in accordance with the standard.
RE: UG-36(g) vs. B16.9 - Eccentric Reducer Section
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: UG-36(g) vs. B16.9 - Eccentric Reducer Section