Message Board Thread - "Ultrasound Question"

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Ultrasound Question Edd Hindmarsh 9/1/2011
We recently carried out UT thickness testing on a quite new boilers internal tubes, they appear to have lost approx 30% of the thickness over 12 months, now approx. 3.5 mm. I am wondering that if we place a frequency tone generator into the manifold of the tubes and use an Ultraprobe 10,000 would the sound pass through the thniner metal, or must there be a puncture. The idea is to find the problems early because of a recent failure which caused more consequential damage and shut down the Plant
 
Re:Ultrasound Question mkgoodman 9/1/2011
Unfortunately, to properly "flood" a boiler with that amount of Ultrasound would be very difficult. The energy required to ultrasonically vibrate that amount of mass, would take more not only a higher output from a standard Ultrasonic Tone Generator, but probably a large number of remote transducers also.

This application is a difficult one for airborne ultrasound,
 
Re:Ultrasound Question Edd Hindmarsh 9/2/2011
Thanks Mark, any other suggestions. 12 months ago the wall thickness of the tubes was 4.5mm, parts of them are now down to 3.5mm, the wear taking place on the outside of the tube
 
Re:Ultrasound Question TDLIR 9/4/2011
Edd Hindmarsh wrote:
Mark, any other suggestions. 12 months ago the wall thickness of the tubes was 4.5mm, parts of them are now down to 3.5mm, the wear taking place on the outside of the tube
Hi Edd,

UT Thickness testing is really the best way to test for remaining wall thickness.

To come up with some answers to your problem, more info is needed:

- What type of boiler
- How is the boiler fired (fuel)
- Where is the OD wear coming from (height and location)?
- Is the wear localized or throughout the entire length on all or certain tubes?
- Where is this bopiler located? (type of plant, enviroment, etc...).

So far you are going on the right track with the UT Thickness Gauging. If you wasnt to spend bigger bucks and more time, you can try IRIS inspection. But the UT Thickness should still suffice.

Figure out what and why this is happening and where it is happening and this will lead to what is the next step to do.

It may be as simple as metalizing the tubes if the problem is errosion that cannot be controled.

Hope this helps.

Sonny James
ASNT NDT Level 3 MT, PT, UT, RT & IR
API 510 Certified Inspector
 


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