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- since 1996 -
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Technical Discussions
Charlie Jackson
Engineering
MBINSPECTION, United Kingdom, Joined Aug 2003, 7

Charlie Jackson

Engineering
MBINSPECTION,
United Kingdom,
Joined Aug 2003
7
01:35 Jun-27-2005
Twisted heat exchanger tube inspections

It would appear that a recent development in the exchager field is twisted tube bundles. Does anyone know of an inspection tool such as iris centest eddy current that has regularly been applied successfully.

Kind Regards Charlie


    
 
 Reply 
 
Ingo Becker
Engineering, NDT Inspector & Sales
ec-works GmbH, Germany, Joined Apr 2000, 30

Ingo Becker

Engineering, NDT Inspector & Sales
ec-works GmbH,
Germany,
Joined Apr 2000
30
03:57 Jun-27-2005
Re: Twisted heat exchanger tube inspections
Charlie,

last year we have developed a customized eddy current probe for the inspection of a twisted tubes heat exchanger located in a refinery. Tube material was SS, tube dimension more or less 1 inch with 1,5mm wall. Please try to contact me for further information

best regards

Ingo

----------- Start Original Message -----------
: It would appear that a recent development in the exchager field is twisted tube bundles. Does anyone know of an inspection tool such as iris centest eddy current that has regularly been applied successfully.
: Kind Regards Charlie
------------ End Original Message ------------




    
 
 Reply 
 
Rich Roberts
Engineering, Executive Managment
Quest Integrity Group, USA, Joined Nov 1998, 78

Rich Roberts

Engineering, Executive Managment
Quest Integrity Group,
USA,
Joined Nov 1998
78
07:48 Jun-27-2005
Re: Twisted heat exchanger tube inspections
Good Day Mr. Jackson,

I believe you are talking about the twisted tubes manufactured by Brown Fin Tube? If so, the laser based LOTIS technique was successfully applied to detect pitting, corrosion, erosion on the ID. The only problem with any of these NDT techniques which shoot a beam (i.e. ultrasound, laser, etc.) is that there are blind spots where the angle of incidence becomes greater than the diameter of the receiver. With twisted tubes the greater the ratio between the minimum diameter: maximum diameter, the larger portion of the tube circumference not inspected.

Regards, Rich


----------- Start Original Message -----------
: It would appear that a recent development in the exchager field is twisted tube bundles. Does anyone know of an inspection tool such as iris centest eddy current that has regularly been applied successfully.
: Kind Regards Charlie
------------ End Original Message ------------




    
 
 Reply 
 
James Gauthier
Engineering,
ABB, Inc., USA, Joined Nov 2007, 25

James Gauthier

Engineering,
ABB, Inc.,
USA,
Joined Nov 2007
25
03:04 Jun-27-2005
Re: Twisted heat exchanger tube inspections

The LOTIS technique that I have seen several times demonstrated a requirement for an extremely clean inner surface. I caution those that want to use this technique if cleaning is going to be an issue.





    
 
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