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Technical Discussions
Babu
India, Joined Oct 2015, 8

Babu

India,
Joined Oct 2015
8
02:59 Oct-22-2015
Notch Vs Side Drilled hole in UT

Dear all,

DAC drawn by Notch block(piping) -good for linear Indication
DAC drawn by side drilled hole(Non-piping) -good for both linear & rounded indication.

My question is why not side drilled hole for Piping which is more critical than non piping?

 
 Reply 
 
Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 747

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
747
14:02 Oct-22-2015
Re: Notch Vs Side Drilled hole in UT
In Reply to Babu at 02:59 Oct-22-2015 (Opening).

Side drilled hole is allowed for piping. Please see ASME V (2013), Article 4, Figure T-434.3-2

2
 
 Reply 
 
Miguel Diaz
Miguel Diaz
18:43 Oct-22-2015
Re: Notch Vs Side Drilled hole in UT
In Reply to Babu at 02:59 Oct-22-2015 (Opening).

Hello,
A reflector is more sensitive than the other whenever there is a comparison or demonstration of the complete system ( UT system used Saut , AUT , TOFD ) in my experience, for a reflector block 0.500in pipes , compared with side holes the basic thickness range for this block, the DAC curve block pipes is more sensitive than the basic block ; 3 to 5 dB ... but this will vary with the material, transducer , equipment, cables ...

Consider the fact that a of pipe block takes into account the curvature of the pipe, which certainly affects the beam energy ...

The blocks may have side drill holes, if the thickness of the pipe permits the manufacture of the holes.

 
 Reply 
 
John
John
23:22 Oct-22-2015
Re: Notch Vs Side Drilled hole in UT
In Reply to Miguel Diaz at 18:43 Oct-22-2015 .

Hard to put in a SDH Parallel to curved surface

2
 
 Reply 
 
Shankar Arumugam
Other, NDE Engineer
India, Joined Oct 2013, 39

Shankar Arumugam

Other, NDE Engineer
India,
Joined Oct 2013
39
12:32 Oct-23-2015
Re: Notch Vs Side Drilled hole in UT
In Reply to Babu at 02:59 Oct-22-2015 (Opening).

All the reflectors are reference only. No specific reflector is good for any specific flaws. The expected flaw's orientation and probe angle should be considered while choosing the reflectors. For Non-piping we can easily make SDH, it can be used as reflector. For Piping either notch or SDH or both can be used as reflectors. Making SDH in curved surfaces is critical but it is possible.

1
 
 Reply 
 
John
John
15:48 Oct-24-2015
Re: Notch Vs Side Drilled hole in UT
In Reply to Shankar Arumugam at 12:32 Oct-23-2015 .

I keep breaking my curved drill bits

 
 Reply 
 
Ed Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1274

Ed Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1274
18:52 Oct-24-2015
Re: Notch Vs Side Drilled hole in UT
In Reply to Babu at 02:59 Oct-22-2015 (Opening).

zoom image
Babu, the simple answer to why notches are used instead of side drilled holes as targets for setting UT sensitivity is ease of manufacture. It is POSSIBLE to get a SDH in a curved block, but usually difficult. I uploaded a couple of images on how some people have managed to get SDHs in components with curved surfaces. In a pipe you can cut a portion of the pipe and mill flat sides in which a SDH can be made. But the diameter of the pipe will limit the ligament and thereby the length available to interact with the beam. People in Eclipse made a custom block (image to the right in the uploaded image) with a single SDH (other side drilled holes could be added at other depths). This second option would be suitable if you did not rely on a skip off the inside surface of the pipe. Both these options require that your probe is placed at the midpoint of the chord formed by the SDH.
I have seen specimens made with EDM (spark erosion) using a curved wire that provided a SDH with a constant depth at all points around the circumference.
Both methods (flat-ended surfaces with SDH and EDM arc-shaped holes) can be time-consuming and costly to make compared to a simple notch.
1
 
 Reply 
 
Ernesto Peduzzi
Other, worker
Italy, Joined Oct 2015, 1

Ernesto Peduzzi

Other, worker
Italy,
Joined Oct 2015
1
00:01 Oct-25-2015
Re: Notch Vs Side Drilled hole in UT
In Reply to Ed Ginzel at 18:52 Oct-24-2015 .

And to get SDHs in a steel plate (same P-Number, same heat treatment, ... ) and to calander it with the same pipe diameter?

 
 Reply 
 
Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 747

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
747
01:10 Oct-25-2015
Re: Notch Vs Side Drilled hole in UT
In Reply to Babu at 02:59 Oct-22-2015 (Opening).

For diameters exceeding 20 inches, a flat calibration can be used. So that simplifies the machining process.

Ernesto - Equivalent P-numbers are allowed

 
 Reply 
 
Ali
NDT Inspector,
Iran, Joined Mar 2013, 101

Ali

NDT Inspector,
Iran,
Joined Mar 2013
101
07:25 Oct-26-2015
Re: Notch Vs Side Drilled hole in UT
I want to add some thing to Anmol comment"For diameters exceeding 20 inches, a flat calibration can be used."
Also an adjustment of receiver gain maybe required when you are usin g flat basic calibration blocks of various thicknesses to calibrate the examination of convex surface materials greater than 20" in diameter.
 
 Reply 
 
John
John
12:01 Oct-27-2015
Re: Notch Vs Side Drilled hole in UT
In Reply to Anmol Birring at 01:10 Oct-25-2015 .

SUbject matter is piping, not vessel or plate

 
 Reply 
 
Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 747

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
747
17:12 Oct-27-2015
Re: Notch Vs Side Drilled hole in UT
In Reply to John at 12:01 Oct-27-2015 .

Yes, flat calibration blocks are allowed for piping with dia exceeding 20 inches

 
 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
19:11 Nov-07-2015
Re: Notch Vs Side Drilled hole in UT
In Reply to Ali at 07:25 Oct-26-2015 .

This 20" rule is too general, it depends on standards so, pay attention.
For PA, for example ISO EN 13588:2013 requires that the gap between wedge and surface shall not exceed 0,5 mm. Therefore, the wider the wedge, the higher the gap.

 
 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
19:14 Nov-07-2015
Re: Notch Vs Side Drilled hole in UT
In Reply to John at 23:22 Oct-22-2015 .

Jon,
hard but not impracticable, indeed very expensive. But when you experiment calibration using curved holes, you also understand that it's worth it.

 
 Reply 
 

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