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Technical Discussions
Oil & Gas, Malaysia, Joined Mar 2012, 2


Oil & Gas,
Joined Mar 2012
11:47 Jan-14-2015
UT data taken during on-stream vs shutdown - the difference?

Good day all.. i'm from oil & gas company.
I've an issue to resolve with regard to ut data.
Is there any difference between ut data taken during on-stream vs shutdown?
For both equipment operated at ambient & above 65 deg celcius.. is there any paper / study done for this?

Tom Nelligan
retired, USA, Joined Nov 1998, 390

Tom Nelligan

Joined Nov 1998
16:20 Jan-14-2015
Re: UT data taken during on-stream vs shutdown - the difference?
In Reply to khaiis at 11:47 Jan-14-2015 (Opening).

Sound velocity in typical carbon steel alloys drops by approximately 1% per 55 degrees Celsius of temperature increase. If velocity calibration is performed at ambient temperature, then thickness or distance readings taken at elevated temperatures will be high due to the velocity drop. Additionally, if you are working with angle beam probes, there will be a couple other factors to consider. Velocity changes in the wedge and the metal will cause the refracted angle to increase; the extent to which this happens can be calculated from Snell's Law. Velocity changes in the wedge will cause a change in wedge delay between cold and hot, and attenuation in common wedge materials increases with temperature. This is discussed in a little more more detail in Section 3 of this application note:

Whether all this will be a significant factor in a given test depends of course on the extent to which temperature changes (which in your case is relatively small compared to many high temperature applications) and the degree of measurement accuracy required for the procedure at hand. That would be up to you to determine based on the specific requirements of your test.


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