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Technical Discussions
saroj
saroj
12:58 Apr-21-2019
TCG

what is better to use side drilled hole or notche when calibrating for piping inspection? is it possible to create TCG by using side drill hole?

    
 
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Clair D'El Rei
NDT Inspector,
I am looking for a new opportunity in the labor market and I accept proposals from other countries i, Brazil, Joined Feb 2019, 15

Clair D'El Rei

NDT Inspector,
I am looking for a new opportunity in the labor market and I accept proposals from other countries i,
Brazil,
Joined Feb 2019
15
14:52 Apr-22-2019
Re: TCG
In Reply to saroj at 12:58 Apr-21-2019 (Opening).

The standards API 1104, ASME B31.3 and B31.6, request the use of notch and with curvature and thickness of the same diameter of the tube to be inspected, and how much the TCG, it is possible yes, since it is an electronic correction of the DAC , ie the entire DAC will be at the same height of the device's screen.

    
 
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Pratik Wagh (NDT Video Library)
Consultant,
NDT Video Library on YouTube, USA, Joined Oct 2011, 23

Pratik Wagh (NDT Video Library)

Consultant,
NDT Video Library on YouTube,
USA,
Joined Oct 2011
23
18:09 May-01-2019
Re: TCG
In Reply to saroj at 12:58 Apr-21-2019 (Opening).

You can do Wedge Delay calibration with a radius block or side drilled holes, Initial Sensitivity and TCG with side drilled holes. and final sensitivity with the notches on the appropriate curved blocks.

    
 
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Paul Holloway
Consultant,
Holloway NDT & Engineering Inc , Canada, Joined Apr 2010, 184

Paul Holloway

Consultant,
Holloway NDT & Engineering Inc ,
Canada,
Joined Apr 2010
184
21:42 May-01-2019
Re: TCG
In Reply to Clair D'El Rei at 14:52 Apr-22-2019 .

zoom image


PH Tool ERVW blocks

API 1104 (2018) requires notches and also flat bottom holes if performing automated UT.

ASME B31.1 (power piping), B31.3 (process piping) both refer to ASME Sec. V Article 4 for ultrasonic technique, which permits *either* notches or side-drilled holes.

Here is an excerpt from ASME Sec V Art 4:

T-434.3 Piping Calibration Blocks. The basic calibration block configuration and reflectors shall be as shown in Figure T-434.3-1 or the alternate provided in Figure T-434.3-2 where curvature and/or wall thickness permits.

Side-drilled holes (as seen in the attached image) can easily be used for making a TCG. Notches will create a steep "bump" in attenuation starting around 60 degrees because of mode conversion. This isn't necessarily a bad thing in the end, but can be problematic when calibrating because the uncorrected signal will be weak around that angle (as you are calibrating, but before you hit "accept" and all the TCG correction takes effect).

I wrote an article on it here:

http://www.hollowayndt.com/news/2018/11/27/notches-vs-side-drilled-holes-chapter-1-echo-dynamics

Contrary to popular belief, using notches does not enhance your ability to detect certain types of discontinuities.
    
 
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