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Technical Discussions
India, Joined May 2018, 4


Joined May 2018
16:41 Jan-21-2020
UT thickness correction on high temperature surfaces

hello friends, please explain the thickness correction on high temperature surfaces ,and give me the example for carbon steel. (I found some answers in Google but I'm not clear about that answers)

Pradeep Boddu
NDT Inspector,
K-KEM , India, Joined Feb 2016, 32

Pradeep Boddu

NDT Inspector,
Joined Feb 2016
18:26 Jan-21-2020
Re: UT thickness correction on high temperature surfaces
In Reply to Jagath at 16:41 Jan-21-2020 (Opening).


A rule of thumb is as follows:

The apparent thickness reading obtained from steel walls having elevated temperatures is high by a factor of about 1% per 55°C.
If the instrument was standardized on a piece of similar material at 20°C, and if the reading was obtained with a surface temperature of 460°C, the apparent reading should be reduced by 8%.

Thank You.

Paul Holloway
Holloway NDT & Engineering Inc , Canada, Joined Apr 2010, 242

Paul Holloway

Holloway NDT & Engineering Inc ,
Joined Apr 2010
20:54 Jan-22-2020
Re: UT thickness correction on high temperature surfaces
In Reply to Pradeep Boddu at 18:26 Jan-21-2020 .


A correction... as you correctly state, the velocity of carbon steel decreases approximately 1% for every 55 deg C. This slower velocity means longer transit time, which would fool the machine into thinking the test piece is getting thicker, not thinner. Once the velocity setting was lowered to the correct value, the resulting thickness reading will be reduced to the correct value.



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