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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
04:59 Feb-18-2009
ASME code for UT on Cat D nozzle welds

What ASME code applies to UT on Cat D nozzle welds?

ASME Sec VIII Div 1 UW-11(a)(7) says:
ultrasonic examination in accordance with UW-53 [which
refers to Appendix 12] may be substituted for radiography
for the final closure seam of a pressure vessel if the construction
of the vessel does not permit interpretable radiographs in
accordance with Code requirements.

So if RT is not feasible, Sec VIII allows UT on the final closure weld. What about the rest of the nozzle weld volume? Would Case 2235 apply?

Thanks for your input.

David Mackintosh

 
 Reply 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
17:10 Feb-18-2009
Re: ASME code for UT on Cat D nozzle welds
In Reply to David Mackintosh at 04:59 Feb-18-2009 (Opening).

Dave

As Code Case 2235 says "its the opinion of the Committee that ALL welds in material 1/2" (13mm) or greater in thickness in PV's may be examined using UT in lieu of RT" with a list of conditions to be complied with, isnt it the contractor's option to use 2235, unless RT is contractually required for all volumetric NDT?

I see nothing ion the conditions of 2235-9 which precludes UT examination of Cat D nozzles provided the conditions are met.

 
 Reply 
 
Roger Duwe
NDT Inspector, API-510, 570, 653
MISTRAS, USA, Joined Jan 2009, 148

Roger Duwe

NDT Inspector, API-510, 570, 653
MISTRAS,
USA,
Joined Jan 2009
148
14:44 Feb-19-2009
Re: ASME code for UT on Cat D nozzle welds
In Reply to Nigel Armstrong at 17:10 Feb-18-2009 .

Nigel is correct on the Code Case. There is also a 'daughter' Code Case that requires the vessel to be stamped UT-3 [or whatever] instead of RT-3, etc. when UT is used in lieu of RT, per Case 2235. Cat. D nozz's are not typically required to be RT'd, so they [generally] don't require UT [or RT]. Since no interpretable RT's can readily be made of Cat. D nozz's, your customer and/or AI will be anticipating UT anyway.

 
 Reply 
 

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