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- since 1996 -
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Technical Discussions
Hareesh Kumar
Hareesh Kumar
06:05 Nov-29-2013
MPI OF PIPE BEVEL EDGES

Dear Experts,
We can go for PT on bevel edges, or fluorescent mpi.
My question is can we use MT on bevel edges by applying white contrast paint? Will there be any adverse effect on welding with the traces of WCP? Please advise.

 
 Reply 
 
Jon Wallis
NDT Inspector, -
Netherlands, Joined Feb 2010, 626

Jon Wallis

NDT Inspector, -
Netherlands,
Joined Feb 2010
626
07:46 Nov-29-2013
Re: MPI OF PIPE BEVEL EDGES
In Reply to Hareesh Kumar at 06:05 Nov-29-2013 (Opening).

Mt on bevels is an examination that you will do thousands of times and not find anything but once in a while you may find a lamination os segregation that will prevent welding being carried out. This is the main reason for the bevel examination.
MT shoud be carried out after all mechanical work has been completed and some argue that if you use white contrast paint the welders will then grind the paint off so that is a further mechanical work..... etc. Some manufacturers of MT chemicals also supply paint remover in a spray can. The fluorescent method is an alternative but requires darkness. Most norms don't say that you must use a contrast paint but only if the background doesn't give sufficient contrast.
Yes PT is a good alternative, the main disadvantage is cost (time). A proper PT examination, even on one bevel, will take you at least 30 minutes (depending on the norm) whereas MT is usually completed in a few minutes.

 
 Reply 
 
HAREESH KUMAR
HAREESH KUMAR
11:52 Nov-29-2013
Re: MPI OF PIPE BEVEL EDGES
In Reply to Jon Wallis at 07:46 Nov-29-2013 .

Thanks jon for your valuable comment and I agree with you. But my doubt still remain... Is there any adverse effect on welding with the traces of WCP?

 
 Reply 
 
anjafo
NDT Inspector
Norway, Joined Aug 2009, 204

anjafo

NDT Inspector
Norway,
Joined Aug 2009
204
14:32 Nov-29-2013
Re: MPI OF PIPE BEVEL EDGES
In Reply to HAREESH KUMAR at 11:52 Nov-29-2013 .

I think question has been asked many times but remains un-answered.
Weld should be on clean metal according procedure I would think, so regardless of effects its not quite right.
You can easily remove white contrast without grinding but I would consider F-MT.

Would be quite an expensive investigation to prove it didn't have any effects...

 
 Reply 
 
Jon Wallis
NDT Inspector, -
Netherlands, Joined Feb 2010, 626

Jon Wallis

NDT Inspector, -
Netherlands,
Joined Feb 2010
626
15:26 Nov-29-2013
Re: MPI OF PIPE BEVEL EDGES
In Reply to HAREESH KUMAR at 11:52 Nov-29-2013 .

I don't know and I suspect you won't get a manufacturer of contrast paint to give you a declaration to say there is no effect on welding.

1
 
 Reply 
 
SSK
Engineering, QA/QC/NDT
NOV (National Oilwell Varco), Angola, Joined Mar 2006, 42

SSK

Engineering, QA/QC/NDT
NOV (National Oilwell Varco),
Angola,
Joined Mar 2006
42
14:02 Nov-30-2013
Re: MPI OF PIPE BEVEL EDGES
In Reply to Jon Wallis at 15:26 Nov-29-2013 .

As per ASME V
The ability of the method to find small discontinuities can be enhanced by using fluorescent particles suspended in a suitable vehicle and by introducing a magnetic field of the proper strength whose orientation is as close as possible to 90 deg to the direction of the suspected discontinuity.

Adverse Effect:
If WCP not cleaned properly undercut may occure.

SSK

 
 Reply 
 

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