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Technical Discussions
Manfred Richter
Consultant,
Richter & Tomasi Ltd., Brazil, Joined Jan 2008, 31

Manfred Richter

Consultant,
Richter & Tomasi Ltd.,
Brazil,
Joined Jan 2008
31
00:29 Aug-14-2019
ASME B31.1 - 2018 Acceptance Criteria

Gentlemen,
I have a question for discussion: - ASME B31.1 revision 2018 indicates in Figure O-8-1 for Surface and Subsurface Indication in its acceptance criteria, the values ​​of 2a and 2d for discontinuity height. However in tables O-9-1, 0-9-2 and O-9-3 refer to a value "h". I'm understanding that the value h is the same as 2a or 2d (total height) and not the half valeu "a" or "d". Am I right? Opinions are welcome.
Best Regards,

    
 
 Reply 
 
Edward Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1266

Edward Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1266
13:37 Aug-14-2019
Re: ASME B31.1 - 2018 Acceptance Criteria
In Reply to Manfred Richter at 00:29 Aug-14-2019 (Opening).

Manfred, your assumption is correct. I am guessing it was NDT technicians not familiar with traditional fracture-mechanics engineering that prompted the change from the traditional "a" and "2a" terminology.

1    
 
 Reply 
 
Manfred Richter
Consultant,
Richter & Tomasi Ltd., Brazil, Joined Jan 2008, 31

Manfred Richter

Consultant,
Richter & Tomasi Ltd.,
Brazil,
Joined Jan 2008
31
15:22 Aug-14-2019
Re: ASME B31.1 - 2018 Acceptance Criteria
In Reply to Edward Ginzel at 13:37 Aug-14-2019 .

Thanks Ed. It doesn't make much sense with the notes in the figure. If the sketch shows 2a / 2d, why indicate h in the note?

    
 
 Reply 
 
Edward Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1266

Edward Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1266
15:27 Aug-14-2019
Re: ASME B31.1 - 2018 Acceptance Criteria
In Reply to Manfred Richter at 15:22 Aug-14-2019 .

This would probably have come out of the way in which Code Case 181.2 was developed. CC181.1 used the traditional format and CC181.2 changed to the technician's version so both notations have been used in ASME publications.

    
 
 Reply 
 
William Jensen
Other,
IHI Southwest Technologies, Inc., USA, Joined May 2017, 64

William Jensen

Other,
IHI Southwest Technologies, Inc.,
USA,
Joined May 2017
64
16:15 Aug-14-2019
Re: ASME B31.1 - 2018 Acceptance Criteria
In Reply to Edward Ginzel at 13:37 Aug-14-2019 .

That seems to be the best explanation.

    
 
 Reply 
 
Sri Krishna Chaithanya
Sembmarine, Singapore, Joined Sep 2018, 6

Sri Krishna Chaithanya

Sembmarine,
Singapore,
Joined Sep 2018
6
03:46 Aug-21-2019
Re: ASME B31.1 - 2018 Acceptance Criteria
In Reply to Manfred Richter at 15:22 Aug-14-2019 .

Hi,

Mentioning the 2a, 2d is for grouping purpose (Yes they are derived from CC 181)

But mentioning h (height) commonly to avoid confusion for Aspect ratio, which is related with acceptance criteria

So 2a, 2d is for grouping purpose and h is for acceptance criteria.

Thanks....

    
 
 Reply 
 

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