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Technical Discussions
David Mackintosh
Engineering,
Acuren Group Inc., Canada, Joined Feb 2011, 85

David Mackintosh

Engineering,
Acuren Group Inc.,
Canada,
Joined Feb 2011
85
08:23 Dec-12-2008
Code Case 2235 examination volume



Code Case 2235 paragraph (a) requires that for t<= 8 inch the examination include the volume of the weld plus the lesser of 1 inch or t on each side of the weld.

In most cases this would require additional TOFD scans with the probe pair offset (see sketch), which in turn might require the weld cap to be ground flat. In other words, it is very difficult to cover the required volume using TOFD alone.

In practice, I believe many NDT examiners are carrying out TOFD without worrying about covering the edges of the examination volume. Can anyone confirm this? Or are there examiners who make the extra effort to cover the entire zone?

Supplemental UT is used to cover the TOFD dead zones. Perhaps supplemental UT should also be used to cover the entire width of the examination volume, thus removing the necessity of grinding the weld cap flat for TOFD.

Thanks,
David Mackintosh


    
 
 Reply 
 
Manfred Richter
Consultant,
Richter & Tomasi Ltd., Brazil, Joined Jan 2008, 31

Manfred Richter

Consultant,
Richter & Tomasi Ltd.,
Brazil,
Joined Jan 2008
31
00:03 Dec-12-2008
Re: Code Case 2235 examination volume
Code Case 2235-9, and now ASME VIII Div.2 Part 7 states that "Alternatively, examination volume may be reduced to include the actual heat affected zone (HAZ) plus 6 mm (1/4 in) of base material beyond the heat affected zone on each side of the weld..." . As the welds shall be approved through a WPS and macros should be done, the HAZ could be measured and the additional scan avoided. I think this is one of the reason to not do additional or Y scan.
Regards,
Manfred


----------- Start Original Message -----------
: Code Case 2235 paragraph (a) requires that for t<= 8 inch the examination include the volume of the weld plus the lesser of 1 inch or t on each side of the weld.
: In most cases this would require additional TOFD scans with the probe pair offset (see sketch), which in turn might require the weld cap to be ground flat. In other words, it is very difficult to cover the required volume using TOFD alone.
: In practice, I believe many NDT examiners are carrying out TOFD without worrying about covering the edges of the examination volume. Can anyone confirm this? Or are there examiners who make the extra effort to cover the entire zone?
: Supplemental UT is used to cover the TOFD dead zones. Perhaps supplemental UT should also be used to cover the entire width of the examination volume, thus removing the necessity of grinding the weld cap flat for TOFD.
: Thanks,
: David Mackintosh
------------ End Original Message ------------




    
 
 Reply 
 
mj
mj
04:08 Dec-13-2008
Re: Code Case 2235 examination volume

Hello David,
u are right most of the people not taking care the edge. also please note that we can cover entire volume with 2 pair TOFD probes. I did 100 mm thick CS sphere with 2 pair TOFD probes. We need to make a notch in the HAZ opposite side of the probes. if you will not get you have to go for 1 set of creeping probes for TOP surface and 1 set of 45% angle shear wave for back surface.
Thanks
MJ





    
 
 Reply 
 

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