ASME VIII Div.1

[fouriek]

Code Reference:
UW-51(b)(3)- Radiographic Examination of Welded Joints.

Background:
UW-51(b): Indications shown on the radiographs of welds and characterized as imperfections are unacceptable under the following conditions………….
(3): any group of aligned indications that have an aggregate length greater than t in a length of 12t, except when the distance between the successive imperfections exceeds 6L where L is the length of the longest imperfection in the group;

Inquiry:
I would like to know if I'm interpreting ASME Section VIII, Div.I, paragraph number UW-51(b)(3) correct. If on a radiograph the group of aligned indications is acceptable under the first part of the paragraph, i.e.: "any group of aligned indications that have an aggregate length greater than 't' in a length of 12t," do I still need to consider the second part of the paragraph that states: "except when the distance between the successive imperfections exceeds 6L where L is the length of the longest imperfection in the group;” ?

Your assistance with this matter will be greatly appreciated.

 

[Duwe6]

No. Poorly written clause, but it is an "If, Then" statement. If there is aligned porosity that exceeds . . ., then it can be accepted based on , , ,

Second clause is only applicable when the porosity fails the first clause. In the 'real word',an RT that passes the first clause will usually pass the second clause.

 

[fouriek]

Thank you very much. I thought as much but your explanation made it clear to me.