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- since 1996 -

Canadian Institute for NDE
We are specialized in training for Radiography, Ultrasonics, Magnetic Particle, Liquid Penetrant, Eddy Current and emerging NDT technologies.
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Technical Discussions
langtuteng
Armenia, Joined Nov 2014, 196

langtuteng

Armenia,
Joined Nov 2014
196
14:24 Jul-29-2018
PA TESTING FOR OIL AND GAS PIPE



hi! has anyone inspected the oil or gas welded pipe which is in service? I want to know that whether oil or gas in the pipe will influence with UT inspection result, especially for the weld root? because according to the theory, liquid oil or gas in the pipe will aborb some acoustic energy, so it will cause the root defect can't be found.

 
 Reply 
 
Manoj Kumar P
Manoj Kumar P
15:12 Jul-29-2018
Re: PA TESTING FOR OIL AND GAS PIPE
In Reply to langtuteng at 14:24 Jul-29-2018 (Opening).

No, you can differentiate the signals. There is no chances of disappearing the signal but lesser the amplitude you cause with. you should compensate the loss of energy by adding some gain. The amount of gain you add depends on the fuel flow inside the pipe which is complex to calculate. Better add some dB based on the usual repeated signal from the active pipe.

 
 Reply 
 
langtuteng
Armenia, Joined Nov 2014, 196

langtuteng

Armenia,
Joined Nov 2014
196
03:16 Aug-05-2018
Re: PA TESTING FOR OIL AND GAS PIPE
In Reply to Manoj Kumar P at 15:12 Jul-29-2018 .

thanks,Manoj Kumar P! I want to know more information about the pipe grith welding inspection. do you just use the PA S scan or use the zone discrimination technology
? because most criteria recommend us use the zone discrimination technology. But I thought S scan is practical. could you give me some advise on it? which technology is more reliable? thanks in advance

 
 Reply 
 
Jason Maure
Canada, Joined Feb 2016, 1

Jason Maure

Canada,
Joined Feb 2016
1
20:21 Aug-10-2018
Re: PA TESTING FOR OIL AND GAS PIPE
In Reply to langtuteng at 14:24 Jul-29-2018 (Opening).

I inspect these weld regularly. The product is not of great concern, however the extremely thin material will be your greatest difficulty.

 
 Reply 
 
Pedro A. Serruto Gamboa
Director, Level II UT, PT
Red Code Quality, Peru, Joined Sep 2013, 88

Pedro A. Serruto Gamboa

Director, Level II UT, PT
Red Code Quality,
Peru,
Joined Sep 2013
88
16:28 Aug-16-2018
Re: PA TESTING FOR OIL AND GAS PIPE
In Reply to langtuteng at 03:16 Aug-05-2018 .

The use of one or other technique, depends of the angle of the defects that you are expecting to locate. What is the joint configuration in your case?

 
 Reply 
 

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