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Technical Discussions
Mahmoud Mohamed
Mahmoud Mohamed
00:56 May-21-2005
Inspection at bottom plates of LNG tank

Dear Sir
Are magnetic fluxes leakages can help us to inspect at welding of bottom plates of LNG tank? Please advice me by the best technique for inspection at bottom plate welding


    
 
 Reply 
 
Frank Lund
R & D,
United Kingdom, Joined Apr 2005, 219

Frank Lund

R & D,
United Kingdom,
Joined Apr 2005
219
00:34 May-23-2005
Re: Inspection at bottom plates of LNG tank
You can use the electromagnetic array (EMA) technique to look for surface breaking cracks in your welds or plates. It has also been used to map corrosion on the inside of marine dieso tanks.


----------- Start Original Message -----------
: Dear Sir
: Are magnetic fluxes leakages can help us to inspect at welding of bottom plates of LNG tank? Please advice me by the best technique for inspection at bottom plate welding
------------ End Original Message ------------




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

John O'Brien

Consultant, -
Chevron ETC ,
USA,
Joined Jan 2000
278
05:21 May-23-2005
Re: Inspection at bottom plates of LNG tank
Mahmoud

please specify weld type and is this new construction sor post service inspection.

MFL is not used for weld inspection.

If lap welds, vaccuum box is normal. If butt weld radiography or UT. Eddy Current can also be considered.

Define the problem then select the appropriate technique.



    
 
 Reply 
 
RT JEYAKUMAR
NDT Inspector
Singapore, Joined Aug 2002, 10

RT JEYAKUMAR

NDT Inspector
Singapore,
Joined Aug 2002
10
06:27 May-24-2005
Re: Inspection at bottom plates of LNG tank
If it is butt welding, you can prefer to go for RT/UT.
If it is other than butt welding, UT is preferable.

for more information, give me some more details about this and contact me in my mail

Best regards

RT Jeyakumar


    
 
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