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- since 1996 -
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Technical Discussions
Jason Youn
Jason Youn
03:24 May-16-2014
[UT] Flaw sizing


Dear All

I'd like to know the method of flaw sizing in ASME SECTION V, ARTICLE 4 and 5.
Althrough I have used the 6dB drop method, I can not confirm the flaw sizing procedure in ASME SECTION V, ARTICLE 4 and 5.

So, I check that 6dB drop method is correct or not, under ASME spec.

Many thanks for your advice..

    
 
 Reply 
 
Diego Martinez del Valle
Consultant,
Freelance, Spain, Joined May 2013, 188

Diego Martinez del Valle

Consultant,
Freelance,
Spain,
Joined May 2013
188
12:05 May-16-2014
Re: [UT] Flaw sizing
In Reply to Jason Youn at 03:24 May-16-2014 (Opening).

Hi Jason
ASME V does not show the metod for sizing indications. The method should be shown in the procedure to be used.
The 6dB drop method may be suitable if the search unit element sizes are apropiate for the minimum indicatio length to be accepted and the distance amplitud technique is used.

1    
 
 Reply 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
07:37 May-21-2014
Re: [UT] Flaw sizing
In Reply to Diego Martinez del Valle at 12:05 May-16-2014 .

Which inspection method (Article 4 Appendices) will you be working to.

The -6dB drop is only useful for sizing flaws with dimensions greater than beam diameter otherwise you are measuring beam not flaw dimensions. This satisfies ASME V Article 4 for length sizing by MUT cobined with DAC as Diego wrote

Appendices 4 to 9 (i think, code not in front of me) deal with semi-automated TOFD or PA inspection where height is determining acceptance. Unless told otherwise stick with DAC and length.

    
 
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