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langtuteng2
Armenia, Joined Nov 2014, 199

langtuteng2

Armenia,
Joined Nov 2014
199
17:03 Sep-23-2019
how to calibrate when using PAUT cobra scanner

hello! most of the sales manager told me cobra scanner is useful for small diameter girth welding. they just said it very useful compared with RT and conventional UT, but when the calibration for cobra scanner was asked, they kept silence. my question is : when we use the cobra scanner for girth welding, which calibration block shall be used for sensitivity calibration because mostly, there is no code for cobra scanner calibration.
thanks

 
 Reply 
 
Paul Holloway
Consultant,
Holloway NDT & Engineering Inc , Canada, Joined Apr 2010, 255

Paul Holloway

Consultant,
Holloway NDT & Engineering Inc ,
Canada,
Joined Apr 2010
255
18:13 Sep-23-2019
Re: how to calibrate when using PAUT cobra scanner
In Reply to langtuteng2 at 17:03 Sep-23-2019 (Opening).

I beg to differ on your comment "there is no code for cobra scanner calibration". Ultrasonic inspection of small diameter piping butt weld joints have been done for decades as per ASME. This is why companies like PH Tool sells these:

https://store.phtool.com/all-products/ph-tool-asme-style-pipe-calibration-block-paut/

 
 Reply 
 
Edward Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1307

Edward Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1307
21:01 Sep-23-2019
Re: how to calibrate when using PAUT cobra scanner
In Reply to Paul Holloway at 18:13 Sep-23-2019 .

Paul, to add to your comment, the "scanner" is not the item "calibrated". The probes used in the scanner would be connected to a phased-array instrument and the signals from the delay-laws would be used to calibrate the system on suitable calibration blocks. Attached to the scanner there could be an encoder. An encoder would be calibrated to ensure that the travelled distance was within tolerances such as provided in ASME V Art. 4.
The "scanner" is merely a convenient holder for the probes.

 
 Reply 
 
Paul Holloway
Consultant,
Holloway NDT & Engineering Inc , Canada, Joined Apr 2010, 255

Paul Holloway

Consultant,
Holloway NDT & Engineering Inc ,
Canada,
Joined Apr 2010
255
23:33 Sep-23-2019
Re: how to calibrate when using PAUT cobra scanner
In Reply to Edward Ginzel at 21:01 Sep-23-2019 .

Ed,

Thank you for the clarification. I assumed he meant ultrasonic calibration using something like a Cobra (or Jireh Circ-it) scanner, but perhaps he meant calibration of the Cobra itself.

In that case, I would suggest he check out ASME Sec. V Article 4 Mandatory Appendix V, para V-467 Encoder Calibration which states:

"A calibration check shall be performed at intervals not to exceed one month or prior to first use thereafter, by moving the encoder a minimum distance of 20 in. (500 mm). The display distance shall be within 1% of the actual distance moved."

 
 Reply 
 
langtuteng2
Armenia, Joined Nov 2014, 199

langtuteng2

Armenia,
Joined Nov 2014
199
01:49 Sep-24-2019
Re: how to calibrate when using PAUT cobra scanner
In Reply to Paul Holloway at 23:33 Sep-23-2019 .

Sorry to make the question unclear. what I mean is: the probes used in the scanner would be connected to a phased-array instrument and the signals from the delay-laws and sensitivity would be used to calibrate the system on suitable calibration blocks. which calibration block shall be used, side drilled hole or rectangle notch? According to ASME V article 4, for tube inspection calibration, the notch shall be used. But notch is not ideal for phased array testing sensitivity calibration when S scan is used due to the echo transmission coefficient. But if we use the side drilled hole, there is another problem: the scanning surface is curve, we can't determine the size and location of the side drilled hole.
thanks

 
 Reply 
 
Creed
NDT Inspector,
Vietnam, Joined Jul 2009, 37

Creed

NDT Inspector,
Vietnam,
Joined Jul 2009
37
07:12 Sep-24-2019
Re: how to calibrate when using PAUT cobra scanner
In Reply to langtuteng2 at 01:49 Sep-24-2019 .

Hi,
Mostly using Cobra scanner would be for piping, so you have to calibrate the Cobra with the calibration blocks for piping which is stated in ASME V code

 
 Reply 
 
Matthias
NDT Inspector, CEO
Dreifeld Materialprüftechnik, Germany, Joined Sep 2005, 105

Matthias

NDT Inspector, CEO
Dreifeld Materialprüftechnik,
Germany,
Joined Sep 2005
105
09:37 Sep-24-2019
Re: how to calibrate when using PAUT cobra scanner
In Reply to langtuteng2 at 01:49 Sep-24-2019 .

Are you looking for ASME or ISO standards?
If ISO, I can send you a draft of a block for BeamTool or just a sketch.

 
 Reply 
 
langtuteng2
Armenia, Joined Nov 2014, 199

langtuteng2

Armenia,
Joined Nov 2014
199
01:54 Sep-25-2019
Re: how to calibrate when using PAUT cobra scanner
In Reply to Matthias at 09:37 Sep-24-2019 .

thanks. my email is :ndtkui@163.com
looking forward to receive your draft of a block for BeamTool or just a sketch

 
 Reply 
 
Paul Holloway
Consultant,
Holloway NDT & Engineering Inc , Canada, Joined Apr 2010, 255

Paul Holloway

Consultant,
Holloway NDT & Engineering Inc ,
Canada,
Joined Apr 2010
255
13:03 Sep-25-2019
Re: how to calibrate when using PAUT cobra scanner
In Reply to langtuteng2 at 01:49 Sep-24-2019 .

As per ASME you are free to use notches or side-drilled holes (SDH).

If you use SDH, the code stipulates that the blocks must be marked to indicate the tangent point (i.e. the "center") of the hole.

I developed these in partnership with PH Tool for this exact application:

https://store.phtool.com/asme-compliant-ervw-line-of-calibration-blocks/

 
 Reply 
 

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