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Technical Discussions
RMM
RMM
02:14 Nov-06-2013
UT to measure excessive penetration

How, if possible would you measure excessive pen using UT? This joint is not accessible to visually inspect.

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

Jon Wallis

NDT Inspector, -
Netherlands,
Joined Feb 2010
626
07:30 Nov-06-2013
Re: UT to measure excessive penetration
In Reply to RMM at 02:14 Nov-06-2013 (Opening).

Grind the cap flush with the parent metal, measure with a 0° probe the thickness including the root and compare this with the thickness of the parent material.

Failing this, if your weld size will allow it, use radiography to make a profile shot.

    
 
 
Liu
Engineering,
China, Joined Jul 2012, 34

Liu

Engineering,
China,
Joined Jul 2012
34
07:47 Nov-06-2013
Re: UT to measure excessive penetration
In Reply to RMM at 02:14 Nov-06-2013 (Opening).

Hi,

In my opinion, if the excessive pen is regular, you can get its peak response echo behind the bottom back echo, but sometimes you will miss them bcz most of the excessive pen is spheric like, you can't get echo back, worstly when you using 60 degree probe

RT would be a good supplementary method to make this clear, you can also using compare shim measure they precisely

    
 
 
RMM
RMM
15:01 Nov-06-2013
Re: UT to measure excessive penetration
In Reply to Jon Wallis at 07:30 Nov-06-2013 .

Jon,

what type of limitations are associated with RT in this scenario?

    
 
 
Stan
NDT Inspector,
Canada, Joined Jan 2009, 31

Stan

NDT Inspector,
Canada,
Joined Jan 2009
31
17:15 Nov-06-2013
Re: UT to measure excessive penetration
In Reply to Jon Wallis at 07:30 Nov-06-2013 .

Keep in mind that often Excessive Penetration contains shrinkages and porosity in it, as well as well as having different amounts of EP. If using UT straight beam to try to measure this, you need to make sure that you are finding the bottom of the EP.

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

Jon Wallis

NDT Inspector, -
Netherlands,
Joined Feb 2010
626
07:29 Nov-07-2013
Re: UT to measure excessive penetration
In Reply to RMM at 15:01 Nov-06-2013 .

There are 2 basic methods. As Mr (or Mrs) Liu suggested taking a DWSI exposure of the weld (assuming it's a pipe weld) and make step wedge out of shim plates to compare the density with that in the root. Disadvantage of this method is its indirectness; the accuracy of measurement depends on the quality of the radiograph, energy of the radiation used, the accuracy of the densitometer, the size of the measured area etc etc. You can use this method up to all thicknesses that your radiation source can penetrate
The other method which is more accurate as it will allow you to measure directly the ex pen, entails placing a film on one side of the weld, a radiation source on the other side at a given distance away from the pipe and exposing the pipe including weld in one shot. You are limited on size of weld and maybe on thickness. Iridium will work up to about 8" diameter, maximum thickness will depend on diameter. Cobalt will allow you to examine greater diameters and or thicknesses.
This method is standard refinery ndt looking for corrosion under insulation.

    
 
 

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