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- since 1996 -
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Technical Discussions
cheema
cheema
13:11 Nov-10-2018
UT limitation

Dear all friends:
how wall thickness of one inch line (SS) can be verified by ultrasonic thickness meter ? is it possible manually with TR probes or required a special probe and shoe?

    
 
 Reply 
 
Ed Ginzel
R & D, -
Materials Research Institute, Canada, Joined Nov 1998, 1268

Ed Ginzel

R & D, -
Materials Research Institute,
Canada,
Joined Nov 1998
1268
14:32 Nov-10-2018
Re: UT limitation
In Reply to cheema at 13:11 Nov-10-2018 (Opening).

A UT thickness meter (preferably with an A-scan display) is probably the most common tool to assess thickness of steels. Since the processing of stainless steel varies from one product form to another, it is not possible to speculate that the product form you are concerned with will be excessively attenuative or not. So why do you not simply try the equipment you have at hand to see if it works?

    
 
 Reply 
 
Sudheer Jai Krishnan
Other,
Olympus, United Arab Emirates (UAE), Joined Sep 2018, 21

Sudheer Jai Krishnan

Other,
Olympus,
United Arab Emirates (UAE),
Joined Sep 2018
21
16:58 Nov-10-2018
Re: UT limitation
In Reply to cheema at 13:11 Nov-10-2018 (Opening).

Hi cheema

Mr.Ginzel made it easy for you. A thickness gages with an A-scan will be helpful in order to find that you are not picking up the noise . TR should work . What thickness gage do you have ?

    
 
 Reply 
 
Cheema
Cheema
19:08 Nov-16-2018
Re: UT limitation
In Reply to Sudheer Jai Krishnan at 16:58 Nov-10-2018 .

Actually I have pipe of 25 mm dia with non attenuated martial. TR probe with 10 mm dia is not making contact. How I find thickness?

    
 
 Reply 
 
Paul Holloway
Consultant,
Holloway NDT & Engineering Inc , Canada, Joined Apr 2010, 189

Paul Holloway

Consultant,
Holloway NDT & Engineering Inc ,
Canada,
Joined Apr 2010
189
20:25 Nov-16-2018
Re: UT limitation
In Reply to cheema at 13:11 Nov-10-2018 (Opening).

zoom image
Your transducer diameter is quite large for the curvature on a 25 mm diameter surface. It may not be ideal, but it should still work provided you ensure the T and R elements are oriented axially and not side by side as shown in the attached picture.
1    
 
 Reply 
 
Emmanuel
Emmanuel
10:57 Nov-17-2018
Re: UT limitation
In Reply to Cheema at 19:08 Nov-16-2018 .

use a matching coverture probe or a smaller probe diameter between 3-5mm crystal diameter - in this case you may only find this diameter as a single crystal - use with delay line to eliminate the dead zone effect.

    
 
 Reply 
 
cheema
cheema
06:55 Nov-21-2018
Re: UT limitation
In Reply to Paul Holloway at 20:25 Nov-16-2018 .

sir,
i applied the TR probe in both way like axial and perpendicular as well, contact was not made on schedule 40, one inch diameter. so i was unable to verify wall thickness of pipe with echometer 1073.
please provide links if any for measuring small dia pipes with UT?

    
 
 Reply 
 
Ashok Kumar Patra
,
Saudi K-KEM Engineering service co, Saudi Arabia, Joined May 2018, 52

Ashok Kumar Patra

,
Saudi K-KEM Engineering service co,
Saudi Arabia,
Joined May 2018
52
11:48 Nov-21-2018
Re: UT limitation
In Reply to cheema at 06:55 Nov-21-2018 .

Please use 5mm probe and you will get the results.

    
 
 Reply 
 
Paul Holloway
Consultant,
Holloway NDT & Engineering Inc , Canada, Joined Apr 2010, 189

Paul Holloway

Consultant,
Holloway NDT & Engineering Inc ,
Canada,
Joined Apr 2010
189
12:41 Nov-21-2018
Re: UT limitation
In Reply to cheema at 06:55 Nov-21-2018 .

An Echometer 1073 is only a D-meter, no A-scan.

I would never use one of these, it's impossible to troubleshoot signals. Would recommend you find someone onsite with an A-scan thickness gauge or flaw detector, and with further UT expertise.

    
 
 Reply 
 

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