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Technical Discussions
Murray Cook
Murray Cook
09:09 Mar-22-2001
Boiler near drum cracking

I am looking for a remote ultrasonic aplication that will detect generator bank tube cicumferential cracking in or slightly above the roll joint at the mud drum. The mud drum will be flooded only access is from the steam drum through the tube ID(aprox.20 feet)to the area of interest. Typical tube ID is 2 inch or less and wall thickness of about 0.180". Near drum external corosion is not an issue so shear wave application is necessary. Is there equipment available for this inspection?

Murray Cook
AITEC Inc.
Thunder Bay ON.
Canada


    
 
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Guido Crapels
Guido Crapels
00:24 Mar-23-2001
Re: Boiler near drum cracking

: I am looking for a remote ultrasonic aplication that will detect generator bank tube cicumferential cracking in or slightly above the roll joint at the mud drum. The mud drum will be flooded only access is from the steam drum through the tube ID(aprox.20 feet)to the area of interest. Typical tube ID is 2 inch or less and wall thickness of about 0.180". Near drum external corosion is not an issue so shear wave application is necessary. Is there equipment available for this inspection?
.
: Murray Cook
: AITEC Inc.
: Thunder Bay ON.
: Canada
.
Reply:

Yes, there is equipment available for these kind of examinations. Please take a look at our site:
http://www.nuson.nl
We provide the means for ultrasonics examinations in tubes, conventionally 3/4", 7/8" and 11/16", but larger diameters are also feasible and have demonstrated to perform well. The UT probes can be customized to the task, so as to register axial or circumferential flaws. The probe will be guided by a flexible hose, driven by a push-puller. The acquisition is PC-software controlled and evaluated.
Once inside the steam drum the probe can be guided towards the mud drum, while the odometer on the push-puller registers the exact displacement. All kinds of scans (A-, B-, C- and customized scans) can be rendered from the acquired data to evaluate the potentially present cracklike flaws.
The practical implications however may constitute a problem: what is the accessibility to the tubes from the steam drum ? The probe has to be inserted manually, as no dedicated manipulators (as in the nuclear power plants) are likely to be available. To what extent can deposits onto the tube ID surface be anticipated ?



    
 
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John O'Brien
Consultant, -
Chevron ETC , USA, Joined Jan 2000, 278

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
278
01:36 Mar-23-2001
Re: Boiler near drum cracking
Try contacting Physical Acoustics at Princeton New Jersey. They have a system we have used called Tubescan. This is a UT C-Scan Imaging System for applications such as yours and it has a shear wave capability for identifying cracking. I do not know if it is on their website www.pacndt.com



    
 
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