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Technical Discussions
steve louderback
steve louderback
07:32 Aug-02-2002
Boiler tube corrosion fatigue internal cracking

Can anybody recommend the best NDE method for detecting internal cracking in boiler tubes @ external welded connections?



    
 
 Reply 
 
Joel Light
Consultant, Corrosion Prevention
Deepwater Corrosion Services Inc., USA, Joined Jul 2002, 12

Joel Light

Consultant, Corrosion Prevention
Deepwater Corrosion Services Inc.,
USA,
Joined Jul 2002
12
07:44 Aug-02-2002
Re: Boiler tube corrosion fatigue internal cracking
: Can anybody recommend the best NDE method for detecting internal cracking in boiler tubes @ external welded connections?
.
If the boiler tubes are continuous, and have any external access, Guided Ultrasonics should do the trick.
If you'd like a bit more information, send me an email and I'll get it to you.


    
 
 Reply 
 
DJ Kallhof
DJ Kallhof
08:07 Aug-02-2002
Re: Boiler tube corrosion fatigue internal cracking
: Can anybody recommend the best NDE method for detecting internal cracking in boiler tubes @ external welded connections?
.
Providing it is a full penetration joint I would recomend radiography. Two superimposed views at 90 dergee, or three at 60 degree seperations should give adequate coverage. These joints are typically elipsed at a three to one ratio but shallow fatigue cracking on the ID surface it could easily be missed by this technique.


    
 
 Reply 
 
S.V.Swamy
Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex , India, Joined Feb 2001, 787

S.V.Swamy

Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex ,
India,
Joined Feb 2001
787
05:31 Aug-03-2002
Re: Boiler tube corrosion fatigue internal cracking
Hello, if the boiler tubes are accessible from ID, a simple visual inspection or IRIS (UT System) will be the right solution. I presume the tubes are ferromagnetic. If so, a multi-frequency eddy current with magnetic saturation, may also be considered.


: Can anybody recommend the best NDE method for detecting internal cracking in boiler tubes @ external welded connections?
.



    
 
 Reply 
 
Borja
Director
Innerspec Technologies, USA, Joined Jun 2002, 36

Borja

Director
Innerspec Technologies,
USA,
Joined Jun 2002
36
07:46 Aug-03-2002
Re: Boiler tube corrosion fatigue internal cracking
We manufacture an EMAT based system precisely for that purpose. The system can measure gage, corrosion fatigue and hydrogen damage all from the OD and for the whole tube. Babcock & Wilcox and Longview have been using it for years.

For more information www.innerspec.com


: Hello, if the boiler tubes are accessible from ID, a simple visual inspection or IRIS (UT System) will be the right solution. I presume the tubes are ferromagnetic. If so, a multi-frequency eddy current with magnetic saturation, may also be considered.
.
:
: : Can anybody recommend the best NDE method for detecting internal cracking in boiler tubes @ external welded connections?
: .
.



    
 
 Reply 
 
Paul Dunnwald
Paul Dunnwald
06:29 Oct-01-2002
Re: Boiler tube corrosion fatigue internal cracking
: Can anybody recommend the best NDE method for detecting internal cracking in boiler tubes @ external welded connections?
.The least expensive methods may be MPI and FPI. MPI can be done with a yoke, depending on the wall thickness, and internal access may not be needed.



    
 
 Reply 
 
Richard D. Roberts
Engineering, Executive Managment
Quest Integrity Group, USA, Joined Nov 1998, 78

Richard D. Roberts

Engineering, Executive Managment
Quest Integrity Group,
USA,
Joined Nov 1998
78
07:52 Oct-01-2002
Re: Boiler tube corrosion fatigue internal cracking
Steve,

You may want to consider the use of Laser Profiling or the LOTIS system. LOTIS was designed to inspect boiler tubing back in the mid 1980's for the US Navy and has inspected tubes in 100's of boilers since then. If you would like additional information on this process please contact me directly.

Regards,
Rich

-- ORIGIONAL MESSAGE --
: Can anybody recommend the best NDE method for detecting internal cracking in boiler tubes @ external welded connections?
.



    
 
 Reply 
 
John Hansen
Director, - Eddy Current Technology
ETher NDE Ltd, United Kingdom, Joined Oct 1999, 73

John Hansen

Director, - Eddy Current Technology
ETher NDE Ltd,
United Kingdom,
Joined Oct 1999
73
08:43 Oct-04-2002
Re: Boiler tube corrosion fatigue internal cracking
If you can get to the inner face then the Hocking Eddy Current WeldScan probe may be suitable.

Link below to our data sheet.

Rgds

John Hansen

Hocking NDT



    
 
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