09:44 Apr-03-2013 Liu Engineering, , China, Joined Jul 2012 34
PAUT application on Duplex Stainless Steel
i have came cross an issue concerns on PAUT caribration on the Duplex Stainless Steel
which diameter smaller then 20inch
According to ASME B31.3 Code,when OD â‰¤20inch piping,we need to use curve wedge,but,how to set our PAUT system? all caribarations shall be completed using curve wedge on a certain curve reference block?
PS:TRL probe and Omiscan sets were used
15:03 Apr-03-2013 Ed Ginzel R & D, -, Materials Research Institute, Canada, Joined Nov 1998 867
Liu, ASME B31.3 will reference ASME Section V for UT. Art. 4 T-432 indicates that contoured contact wedges "may be used" to aid in coupling. However, for small diameters the contoured wedge is the only practical option for weld inspections. Para. T-450 allows variation from the instructions in Article 4 (this might include how you calibrate for curved wedges) but it requires that you demonstrate that your changes can achieve equal or better sensitivity and detection.
05:26 Apr-06-2013 Liu Engineering, , China, Joined Jul 2012 34
thanks for you response,I want to inspect 12inch Duplex weld with TRL probe,
now we are trying to design the calibration and qualification block,
I have looked over ASME section V,but nothing useful words i've found about how to calibrate PAUT systems when contoured contact wedges(curve wedge) has been used
on small Diameter piping inspection
can we using flat wedge to calibrate everything and change to contoured contact wedges(curve wedge) directly?i have attempted and it's workable,but as i learnt , if wedge change PAUT system needs to be re-calibrated
i am a new guys on small piping PAUT test,much appreciate anyone can help me
15:11 Apr-06-2013 Ed Ginzel R & D, -, Materials Research Institute, Canada, Joined Nov 1998 867
Liu, if you are making a qualification block then you will be demonstrating the procedure to the AI. If your procedure clearly describes how you calibrate, with suitable subsequent consideration for the verification of detection on your qualification block, then I would think that you have addressed the concerns of the code. It is my understanding that the function of the demonstration is to provide evidence that the specialised technique will detect, size and categorise the flaws of concern. There is also a new term used, the Scanner Block. This seems to be a dynamic calibration block for automated systems. It would be easier to comply if your Scanner block contained a SDH target that you could use to both set delay and use for setting sensitivity.