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- since 1996 -

Materials Research Institute
Consulting to the NDT industry.
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Technical Discussions
Govindraj
NDT Inspector,
Usonix Inspection Solutions Pvt Ltd, India, Joined Sep 2013, 2

Govindraj

NDT Inspector,
Usonix Inspection Solutions Pvt Ltd,
India,
Joined Sep 2013
2
12:11 Jan-08-2016
Inspection without removing coating

Is there any technique which can inspect thickness of carbon steel of 12.7mm thickness and 6" dia with 5mm of Nepprene coating. The client want to inspect without removing the coating.

 
 Reply 
 
Tom Nelligan
Engineering,
retired, USA, Joined Nov 1998, 390

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
14:54 Jan-08-2016
Re: Inspection without removing coating
In Reply to Govindraj at 12:11 Jan-08-2016 (Opening).

Yes, you can very likely use an echo-to-echo measurement technique. To get through 5 mm of neoprene, which is quite attenuating, I would suggest working at 2/2.25 MHz. We have an application note that is written around measurement through thin paint rather than thick neoprene, but the description of echo-to-echo testing applies in this case as well. You can do this with any flaw detector, and with quality thickness gages that have a waveform display and adjustable setups.

http://www.olympus-ims.com/en/applications/measuring-metal-thickness-paint/

 
 Reply 
 
Malcolm Hill
United Kingdom, Joined Jun 2012, 14

Malcolm Hill

United Kingdom,
Joined Jun 2012
14
14:57 Jan-08-2016
Re: Inspection without removing coating
In Reply to Govindraj at 12:11 Jan-08-2016 (Opening).

It depends what you are looking for-if its wall thinning/ internal damage-Intelligent pigging or long range UT will give you some results.BUT if you mean at the welds or outer surface-There wont be enough bond between the coat and the pipe to allow ultrasound through(TOFD PA AUT MANUAL) or ACFM etc?-and radiography will be to time consuming and poor images

 
 Reply 
 
Pedro A. Serruto Gamboa
Director, Level II UT, PT
Red Code Quality, Peru, Joined Sep 2013, 87

Pedro A. Serruto Gamboa

Director, Level II UT, PT
Red Code Quality,
Peru,
Joined Sep 2013
87
16:01 Jan-10-2016
Re: Inspection without removing coating
In Reply to Govindraj at 12:11 Jan-08-2016 (Opening).

Download Inspection of Neoprene by the side of steel with UT

Dear collegue, take a look of this papper that I made about the problems that I found in a same inspection.
 
 Reply 
 
Nasser
Saudi Arabia, Joined Feb 2016, 2

Nasser

Saudi Arabia,
Joined Feb 2016
2
14:00 Apr-14-2016
Re: Inspection without removing coating
In Reply to Pedro A. Serruto Gamboa at 16:01 Jan-10-2016 .

HOW are you every one? I have a final project and I just want to know what is going to happen to the sound in coated carbon steel ?

 
 Reply 
 
Laurent
Consultant,
France, Joined Mar 2016, 16

Laurent

Consultant,
France,
Joined Mar 2016
16
17:12 Apr-14-2016
Re: Inspection without removing coating
In Reply to Govindraj at 12:11 Jan-08-2016 (Opening).

Depending of what you are looking for.
If you resaerch inside defect the magnetostriction method can be used:
http://www.ndt.net/article/mendt03/48/48.htm

 
 Reply 
 
Nasser
Saudi Arabia, Joined Feb 2016, 2

Nasser

Saudi Arabia,
Joined Feb 2016
2
19:15 Apr-14-2016
Re: Inspection without removing coating
In Reply to Laurent at 17:12 Apr-14-2016 .

No I meant the reflation and scattered sound in a coated plate what will be the reaction of the sound under this condition

part of my project is to study that the affect of coating on the carbon steel by conventional ultrasonic testing

Nasser..

 
 Reply 
 
cptbtptp248
cptbtptp248
08:31 Nov-01-2016
Re: Inspection without removing coating
In Reply to Govindraj at 12:11 Jan-08-2016 (Opening).

l think you can also use the metal detector to judege that is there any metal in the soil. l bought a metal detector in http://www.kingdetector.com/. l also find something interesting.It can detect missing or lost coins, pieces of jewellery and other metal objects.

 
 Reply 
 

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