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Re: Acceptance of Defect Indications Detected by TOFD.

Posted by: John O'Brien (PID_498), E-mail: obirc@aol.com, on January 03, 2006 at 16:25 :

In Reply to: Re: Acceptance of Defect Indications Detected by TOFD. posted by : Ed Ginzel    , E-mail: eginzel@mri.on.ca, on January 03, 2006 at 14:40 :

Gentlemen

be cautious about a generic discussion.

The Code Acceptance approach only applies to new construction. The decision then is clear - does your code or some form of waiver such as the ASME Code Case address TOFD. If so then you can proceed. If not the answer is no you cannot use it.

The concept that because there is a lack of unified guidance under the European PED and one country has a national standard that does address TOFD means you can use that code anywhere in the EU is not always true.

If you are sizing in-service flaws then the original code of construction often may not apply and an FFS approach where you calculate acceptable flaw size may be taken. In that assessment you can also determine POD and POS of the technique such as TOFD and set your own acceptance criteria.

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----------- Start Original Message ----------- : Gentlemen : be cautious about a generic discussion. : The Code Acceptance approach only applies to new construction. The decision then is clear - does your code or some form of waiver such as the ASME Code Case address TOFD. If so then you can proceed. If not the answer is no you cannot use it. : The concept that because there is a lack of unified guidance under the European PED and one country has a national standard that does address TOFD means you can use that code anywhere in the EU is not always true. : If you are sizing in-service flaws then the original code of construction often may not apply and an FFS approach where you calculate acceptable flaw size may be taken. In that assessment you can also determine POD and POS of the technique such as TOFD and set your own acceptance criteria. ------------ End Original Message ------------

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