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- since 1996 -

Canadian Institute for NDE
We are specialized in training for Radiography, Ultrasonics, Magnetic Particle, Liquid Penetrant, Eddy Current and emerging NDT technologies.
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Technical Discussions
Zacharias Rohith Joseph
Engineering,
Jindal Steel and Power limited, India, Joined Sep 2017, 2

Zacharias Rohith Joseph

Engineering,
Jindal Steel and Power limited,
India,
Joined Sep 2017
2
05:29 Sep-19-2017
Interpretation of UT defect Ratings on AWS D1.1

Hello everyone.

As per AWS D1.1 UT defects are rated as Classes A,B,C,D based on what value is got from the formula d=a-b-c.

Most of these values are positive values thus helping us figure out in what class the defect is.

Could anyone please clarify what one must do when a negative value is obtained.

For example -2.3db

Thanks in advance.

 
 Reply 
 
Paul Holloway
Consultant,
Holloway NDT & Engineering Inc , Canada, Joined Apr 2010, 227

Paul Holloway

Consultant,
Holloway NDT & Engineering Inc ,
Canada,
Joined Apr 2010
227
22:02 Sep-19-2017
Re: Interpretation of UT defect Ratings on AWS D1.1
In Reply to Zacharias Rohith Joseph at 05:29 Sep-19-2017 (Opening).

Hello Zach,

Hopefully your employer is not tasking you with performing UT without first having you familiar with the code. No harm in asking a question though.

The North American structural codes, at present, are counter intuitive when it comes to indication ratings. Lower numbers are "bigger" than higher numbers.

A minus 2.3dB indication is more serious than a positive 2.3dB. This is reflected in the acceptance tables where you will find that a Class A indication is a lower number than a Class B, and in many cases, is negative.

 
 Reply 
 
BODDU PRADEEP
NDT Inspector,
K-KEM , India, Joined Feb 2016, 32

BODDU PRADEEP

NDT Inspector,
K-KEM ,
India,
Joined Feb 2016
32
11:21 Sep-22-2017
Re: Interpretation of UT defect Ratings on AWS D1.1
In Reply to Zacharias Rohith Joseph at 05:29 Sep-19-2017 (Opening).

Refer Table 6.2/6.3 in AWS D1.1(2015)

 
 Reply 
 

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