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- since 1996 -
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Technical Discussions
Nikhil Srivadtava
India, Joined Jul 2013, 2

Nikhil Srivadtava

India,
Joined Jul 2013
2
19:29 Jun-26-2019
Selection of UT probe

Please suggest the relation between UT probe dia and test suface curvature OD.

kindly suggest probe specs for 20 mm pipe OD and 3 mm thickness

 
 Reply 
 
Satwant
,
Singapore, Joined Jun 2019, 3

Satwant

,
Singapore,
Joined Jun 2019
3
11:34 Jun-27-2019
Re: Selection of UT probe
In Reply to Nikhil Srivadtava at 19:29 Jun-26-2019 (Opening).

Hi Nikhil,

Manual UT is not possible for this tube. Better to go for RT. Minimum thickness for manual UT is 8mm.

 
 Reply 
 
laurie
Australia, Joined Feb 2019, 36

laurie

Australia,
Joined Feb 2019
36
12:23 Jun-27-2019
Re: Selection of UT probe
In Reply to Nikhil Srivadtava at 19:29 Jun-26-2019 (Opening).

If you give a bit more information someone might be able to help.
Are you testing a weld or for thinning?
What material?
New or in-service?
What sort of weld process?
Is the surface ground smooth?

 
 Reply 
 
Wiesław Bicz
Engineering,
PBP Optel sp. z o.o., Poland, Joined Feb 2009, 268

Wiesław Bicz

Engineering,
PBP Optel sp. z o.o.,
Poland,
Joined Feb 2009
268
14:54 Jun-27-2019
Re: Selection of UT probe
In Reply to Satwant at 11:34 Jun-27-2019 .

It is possible. Only the standards are not describing this. It is much better to make automatic testing of such pipes - not depending from which material.

It is possible to use use ultrasound for testing pipes with practically any diameter and thickness, made from almost any material.

 
 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
15:04 Jun-27-2019
Re: Selection of UT probe
In Reply to Satwant at 11:34 Jun-27-2019 .

zoom image



Good gravy, of course UT can be done on thicknesses less than 8mm! Thickness or weld inspection.

If you are doing thickness checks, there isn't a hard-and-fast rule about how small your probe face must be. However, the smaller the better to make the most of the contact surface area. For thickness checks on something like that, I would recommend a pen probe (or pencil, same thing). My favourite is the Dakota 10MHz version P/N T-481-4507. Olympus makes a 15MHz version which is also very good.

If you are limited in area around the tube, Dakota offers a very small, 90 degree version without the shaft. It's a little tricky to hold (and easy to lose) but very useful.

If using a regular size probe, go with a dual element type (Sonatest PDEM 2550 or 2510).

As well, you should be using a contoured calibration block. PH Tool now offers the Extended Range Variable Diameter (ERVD) step wedge (image attached).
1
 
 Reply 
 
laurie
Australia, Joined Feb 2019, 36

laurie

Australia,
Joined Feb 2019
36
01:26 Jun-28-2019
Re: Selection of UT probe
In Reply to Paul Holloway at 15:04 Jun-27-2019 .

Very cool calibration block - I can imagine that was a huge investment in time.
Is there really any measurable difference between calibration with a flat block and a curved block or is it more a confidence tool for less skilled technicians?

 
 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
10:24 Jun-28-2019
Re: Selection of UT probe
In Reply to laurie at 01:26 Jun-28-2019 .

Hi Laurie,

For a pen probe, no it won't make much difference. But for dual crystal probes, absolutely. I've run training before where we used flat and curved blocks and showed the students the differences.

Its also a necessity for boiler tubes inspection, where you are scrubbing tubes all day and wearing the face down. After only half an hour, the probe can get "cupped". You need to continually adjust the probe delay to account for wear, and only a curved block will work once it's cupped.

 
 Reply 
 

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