EN 473 was the one you where looking for.
Nuclear is where I got the experience with AUT. IGSCC is not actually that difficult once you get used to it.
Round trip tandem, delta, there are many tandem techniques. Personal never comes into it. They either know
what they are doing, and make the right calls, or they don't. At least thats my opinion for what it's worth.
Regards,
Gerald
API 650 Para.6.3.2.2 states if UT is performed inlieu of RT, then you must follow the requirements of Appendix U. If it is performed "NOT" in lieu of radiogrpahy, then it must meet the requirements of ASME Section V, Article 5. Either way you must follow Article 5.
Article 5 now has it's own TOFD requirements in the new Mandatory Appendix III. The only real difference between App. III and other TOFD codes from what I can see is that ASME requires supplemental Shear wave examinations to cover the dead zones at the ID and OD surfaces. I believe most European Standards do not require this, but if you are working to ASME, then you must do it. That is until ASME removes it. I have seen the far surface resolution qualified by detecting a 1mm notch in the root are of a weld, but the near surface has a 2-3mm blind spot due to the Lateral Wave.
I don't see any special requirements for Qualification and Certification of TOFD personel, but my experience shows me that the technicians should have experience with TOFD. At least a couple of years in addition to the UT experience.
As far as your French certified techncians go, they are most likely certified in accordance with a Program that meets the requirements of EN-473. EN-473 I believe is in line with ASNT's Central Certification Program, so that shouldn't be a problem.
I personally would like to see the technicians at least company qualified for TOFD in addition to UT.
You must qualify your procedure in accordance with ASME Section V, App. III.
When using Appendix U, there is an acceptance criteria already there. However, if it is conducted as part of the contract or purchase order the acceptance criteria must be as follows:
6.3.2.5 Acceptance standards shall be agreed upon by the purchaser and the manufacturer.
This is usually in the form of an ECA based acceptance criteria.
Most of the codes are beginning to recognize TOFD as a stand alone examination technique. There are some code cases based on ASME Code Case 2235. ASME B31.3 has one as well. It's called B31 Case 181.