ASME VIII-1 impact test requirements of UG-20 (f) and UCS-66
ASME VIII-1 impact test requirements of UG-20 (f) and UCS-66
(OP)
Material SA-516Gr70, non-normalized, thickness=22.2 mm, design MDMT is -29°C
1. As per UG-20(f) it is exempted from impact test.
2. As per UCS-66, obtained -5°C of MDMT from curve B, so impact test required or use SA-516Gr70 normalized.
In view above, there is conflict between UG-20(f) and UCS-66 in some cases. This will make people confusing, which one we shall follow, UG-20(f) or UCS-66? This may virtually make a contradiction between the client/user and manufacturer. The manufacturer prefers UG-20(f), but client may prefer UCS-66.
1. As per UG-20(f) it is exempted from impact test.
2. As per UCS-66, obtained -5°C of MDMT from curve B, so impact test required or use SA-516Gr70 normalized.
In view above, there is conflict between UG-20(f) and UCS-66 in some cases. This will make people confusing, which one we shall follow, UG-20(f) or UCS-66? This may virtually make a contradiction between the client/user and manufacturer. The manufacturer prefers UG-20(f), but client may prefer UCS-66.





RE: ASME VIII-1 impact test requirements of UG-20 (f) and UCS-66
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: ASME VIII-1 impact test requirements of UG-20 (f) and UCS-66
RE: ASME VIII-1 impact test requirements of UG-20 (f) and UCS-66
Regards,
Mike
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: ASME VIII-1 impact test requirements of UG-20 (f) and UCS-66
Question: May pressure vessel materials be exempted from impact testing if all of the requirements of UG-20(f) in Section VIII, Division 1 are met, even though impact testing would be required under the provisions of Fig. UCS-66?
Reply: Yes.
Hope this helps.
RE: ASME VIII-1 impact test requirements of UG-20 (f) and UCS-66
The interpretation VIII-1-92-201 might give a great help to convince users. In fact, most of cases this may be only the way to convince clients, they would not be care what your explanation is at all if it is not mentioned in the Code.
RE: ASME VIII-1 impact test requirements of UG-20 (f) and UCS-66
The problem with sloppy work is that the supply FAR EXCEEDS the demand
RE: ASME VIII-1 impact test requirements of UG-20 (f) and UCS-66
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: ASME VIII-1 impact test requirements of UG-20 (f) and UCS-66
UG-20(f) > USC-66(a) > UCS-66(b) > UCS-68(c) > UG-84 > Matl. Specn.
At any stage from left to right of the path, if impact test is not required, we need not examine further to right.