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Technical Discussions
JAGAN
Engineering,
Saudi Arabia, Joined Dec 2011, 23

JAGAN

Engineering,
Saudi Arabia,
Joined Dec 2011
23
12:19 Nov-15-2014
Boiler tubes inside scale thickness

Boiler tubes inside scale thickness which method is best
LFET or EMAT
And kindly provide the reasons with other information too.

Thanks

 
 Reply 
 
Sudheer Jai Krishnan
Sudheer Jai Krishnan
18:58 Nov-15-2014
Re: Boiler tubes inside scale thickness
In Reply to JAGAN at 12:19 Nov-15-2014 (Opening).

Hi Jagan

There is already 38DL plus Ultrasonic Thickness Gage which can measure the boiler scale thickness alsong with the thickness of the tube. So it gives you two readings at a time, one is scale thickness and the other is remaining metal thickness. Havent you seen it?

http://www.olympus-ims.com/en/38dl-plus/
http://www.olympus-ims.com/en/applications/measuring-oxide-scale-boiler-tubes/

Regards

Sudheer Jai Krishnan

 
 Reply 
 
Borja
Director
Innerspec Technologies, USA, Joined Jun 2002, 36

Borja

Director
Innerspec Technologies,
USA,
Joined Jun 2002
36
20:29 Nov-15-2014
Re: Boiler tubes inside scale thickness
In Reply to JAGAN at 12:19 Nov-15-2014 (Opening).

There are two types of EMAT solutions in the market. Both are quantitative techniques that measure remaining wall.
- temate TG-IS(B) is a system made by Innerspec specifically designed for boiler inspection that permits scanning the full length of the tube and measure the actual remaining wall. It also detects Hydrogen Corrosion Cracking. It works on all kinds of tubes, even if they are heavily pitted inside or outside.
- EMAT sensors. Olympus, Sonatest and Innerspec also sell EMAT sensors for spot checking of boiler walls. The normal beam technique works only on tubes that are not corroded.

LFET is a qualitative technique that scans the tube and looks for variations on a pre-established baseline to find potential defects.

Best regards,
Borja

There are EMAT sensors that can be attached to standard UT flaw detectors to spot check tubes and measure remaining wall, but they only provide

 
 Reply 
 
Eng. ahmad
Eng. ahmad
11:21 Nov-26-2014
Re: Boiler tubes inside scale thickness
In Reply to Sudheer Jai Krishnan at 18:58 Nov-15-2014 .

Dears

we have the instrument and the software

And the discussion about the tubes inside scale thickness measurement using 38 DL plus - Olympus , with M2091 transducer .

regards

 
 Reply 
 

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