It is designer's choice (what is end use, is it for skirt base or any part of the item which is subjected to stress due to pressure?); AD has a choice of choosing between D or US for butt welds under stress (LN)
In ASME Design “E” is selected based on RT; other wise it is quite normal to use UT for skirt base flange made of segments from plate, otherwise I have not come across any body flange made from plate in segment, instead of forging.
However TOFD can be and is used as a substitution of RT. It is superior in that it can fully characterize and size defects that are found. It is permitted as a substitute for RT in the ASME Boiler and Pressure Vessel Code via Code Case 2235.However, the use of TOFD requires substantial skill and experience.
Note: RT is superior for what it does. TOFD is a new toy to play!
-----Original Message-----
From: PED2000@googlegroups.com [mailto:PED2000@googlegroups.com] On Behalf Of Singh Rishi Raj (Tasnee Site)
Sent: Tuesday, May 27, 2008 6:54 PM
To: PED2000@googlegroups.com
Subject: [PED:87] Re: UT as NDT for Welded Joints
Intresting !!!
Please let us know more details.
In AD , NDT requirements are based on metal.
Specific details will help us .
Best Regards,
Rishi Raj Singh
-----Original Message-----
From: PED2000@googlegroups.com [mailto:PED2000@googlegroups.com] On
Behalf Of Rajesh
Sent: 27 May 2008 16:09
To: Process Equipment Design
Subject: [PED:86] UT as NDT for Welded Joints
Dear All,
May I know if what is the preffered practice of NDT for Welded joints,
particularly when flanges are made in segments & then welded.
As I understand ASME does not allow UT
But AD- Merckblatt recommeds UT.
Please comment.
Regards
Rajesh Bhavsar
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