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- since 1996 -
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Technical Discussions
junho
NDT Inspector,
KOREA Material INSPECTION, South Korea, Joined Oct 2009, 21

junho

NDT Inspector,
KOREA Material INSPECTION,
South Korea,
Joined Oct 2009
21
07:22 Feb-08-2010
TOFD Flaw acceptance criteria for 64~100mm ?????

hi all

I don't know that Flaw acceptance criteria for 64mm~100mm.

NOTE : For intermediate flaw aspect ratio a/ and thickness t (21⁄2 in. [64 mm] < t < 4 in. [100 mm]) linear interpolation is permissible. <<< what's mean????


i always appreciate for your help

    
 
 Reply 
 
jagadish
jagadish
18:00 Feb-08-2010
Re: TOFD Flaw acceptance criteria for 64~100mm ?????
In Reply to junho at 07:22 Feb-08-2010 (Opening).

You should draw a linear interpolation line or use mathematical equation and get the desired a/t. you should use two different lines for surface and subsurface flaws. If still not clear mail me at jagadish.ndt@gmail.com

    
 
 Reply 
 
junho
NDT Inspector,
KOREA Material INSPECTION, South Korea, Joined Oct 2009, 21

junho

NDT Inspector,
KOREA Material INSPECTION,
South Korea,
Joined Oct 2009
21
00:48 Feb-10-2010
Re: TOFD Flaw acceptance criteria for 64~100mm ?????
In Reply to jagadish at 18:00 Feb-08-2010 .

I still don't know clearly....

I don't know that linear interpolation line or mathematical equation

It's not mentioned at ASME Code case 2235-9

I'm sorry that I don't kown english very well. so I don't described in detail.

thank you

    
 
 Reply 
 
JoSE GARCIA
JoSE GARCIA
13:55 Sep-12-2011
Re: TOFD Flaw acceptance criteria for 64~100mm ?????
In Reply to jagadish at 18:00 Feb-08-2010 .

Dear Jagadish
I have the same problem of interpolation, because i cant see any linearity on relationship between surface and sub surface flaws.
Ihave been doing the acceptance criteria based on the nearest aproximation, but i have now a vessel 83mm thick, i dont realy know how to do this linear interpolation that the code say.
Thank you for your answer.

    
 
 Reply 
 
massimo carminati
Consultant, AUT specialist
IMG Ultrasuoni Srl, Italy, Joined Apr 2007, 691

massimo carminati

Consultant, AUT specialist
IMG Ultrasuoni Srl,
Italy,
Joined Apr 2007
691
20:30 Sep-12-2011
Re: TOFD Flaw acceptance criteria for 64~100mm ?????
In Reply to JoSE GARCIA at 13:55 Sep-12-2011 .

zoom image
Here is an example: let's assume we have an a/l ratio of 0.25 and a thickness of 80 mm. a/t ratio for 65 mm is 0.066 and from 100 mm 0.038.

The graph in the picture is a simple linear interpolation between values and is easy todetermine the interpolated value for 80 mm or any other thickness value between 65 and 100.
    
 
 Reply 
 
Oliviero
NDT Inspector,
Quality Control srl, Italy, Joined Oct 2008, 414

Oliviero

NDT Inspector,
Quality Control srl,
Italy,
Joined Oct 2008
414
22:19 Sep-14-2011
Re: TOFD Flaw acceptance criteria for 64~100mm ?????
In Reply to massimo carminati at 20:30 Sep-12-2011 .

The same interpolation showed by Massimo need to be done for each a/l ratio and both for surface and sub-surface values

    
 
 Reply 
 
junho
NDT Inspector,
KOREA Material INSPECTION, South Korea, Joined Oct 2009, 21

junho

NDT Inspector,
KOREA Material INSPECTION,
South Korea,
Joined Oct 2009
21
05:29 Sep-15-2011
Re: TOFD Flaw acceptance criteria for 64~100mm ?????
In Reply to massimo carminati at 20:30 Sep-12-2011 .

Dear massimo.

I can't understand your calculation a/t ratio.

why 65mm is 0.066 and 100mm 0.038 ???

sorry massimo, I want to more information for flaw acceptance criteria.

thanks.

    
 
 Reply 
 
Oliviero
NDT Inspector,
Quality Control srl, Italy, Joined Oct 2008, 414

Oliviero

NDT Inspector,
Quality Control srl,
Italy,
Joined Oct 2008
414
09:16 Sep-15-2011
Re: TOFD Flaw acceptance criteria for 64~100mm ?????
In Reply to junho at 05:29 Sep-15-2011 .

Dear Junho,
on the CC2235-9 table 2 show the acceptance criteria limits for 25 mm to 300 mm thick weld.
In table 2 the first column shows the reference aspect ratio of the sized flaw. The second and third column are the a/t limits for thick welds from 25 to 64 mm. The fourth and fifth column are the a/t limits for thick welds from 100 mm to 300 mm.
Between the 64 mm and 300 mm the "NOTE" posted by you on February 8 2010 is applicable.
So for each a/l aspect ratio reference value you need to interpolate the a/t limits value.
The example made by Massimo is relevant to the a/l aspect ratio 0,25 where in CC2235-2 table 2 the a/t limit values for the subsurface defect are 0,066 for thickness 64 mm and 0,038 for thickness 100 mm. The graph made by Masssimo shows the interpolation between these two values 0,066 and 0,038 for each weld thickness between 64 and 100 mm.

    
 
 Reply 
 

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