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Technical Discussions
WAN
WAN
02:21 Aug-17-2008
TOFD acceptance code

Does anyone who knows which applicable acceptance standard for using TOFD in process piping.


    
 
 
Ed T.
Ed T.
02:44 Aug-18-2008
Re: TOFD acceptance code
----------- Start Original Message -----------
: Does anyone who knows which applicable acceptance standard for using TOFD in process piping.
------------ End Original Message ------------

Yes it's B31 Case 181


    
 
 
Udo Schlengermann
Consultant, -
Standards Consulting, Germany, Joined Nov 1998, 176

Udo Schlengermann

Consultant, -
Standards Consulting,
Germany,
Joined Nov 1998
176
01:28 Aug-18-2008
Re: TOFD acceptance code
reply:
There is a European Draft Standard on TOFD acceptance criteria:

prEN 15617:2008
Non-destructive testing of welds — Time-of-flight diffraction technique (TOFD) — Acceptance levels
Document CEN/TC121/SC5/WG2 N243.


----------- Start Original Message -----------
: Does anyone who knows which applicable acceptance standard for using TOFD in process piping.
------------ End Original Message ------------




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

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
04:00 Aug-18-2008
Re: TOFD acceptance code
Wan,

Note that B31 Case 181 is much more than just alternative acceptance criteria - a whole bunch of requirements should be met, including the capability of the system should be demonstrated and accurate defect measurements must be made. Use of Case 181 has to be considered and prepared for at the design stage - I have witnessed many occasions when most of the requirements were not taken into consideration. Good luck in using it properly.

Nigel

----------- Start Original Message -----------
: : Does anyone who knows which applicable acceptance standard for using TOFD in process piping.
: Yes it's B31 Case 181
------------ End Original Message ------------




    
 
 
Ed T.
Ed T.
05:17 Aug-18-2008
Re: TOFD acceptance code
----------- Start Original Message -----------
: Wan,
: Note that B31 Case 181 is much more than just alternative acceptance criteria - a whole bunch of requirements should be met, including the capability of the system should be demonstrated and accurate defect measurements must be made. Use of Case 181 has to be considered and prepared for at the design stage - I have witnessed many occasions when most of the requirements were not taken into consideration. Good luck in using it properly.
: Nigel
: : : Does anyone who knows which applicable acceptance standard for using TOFD in process piping.
: : Yes it's B31 Case 181
------------ End Original Message ------------

Thanks Nigel You're absolutely correct. Its just that if he is working to ASME he neeeds to use b31 Case 181. If he is working to a European or British Standard then the standard Udo mentioned would probably apply.



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

David Mackintosh

Engineering,
Acuren Group Inc.,
Canada,
Joined Feb 2011
85
01:25 Aug-18-2008
Re: TOFD acceptance code
P.S. B31 Case 181 is available at http://cstools.asme.org/csconnect/pdf/CommitteeFiles/15243.pdf on page 5.


    
 
 

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