Minimum required thickness for PAUT for process piping

[Rafay.T]

Hello,

Can we perform PAUT on process piping (Diameter: 6 inches, Thickness: 3 mm, material: SS-304). Is there a limitation of minimum required thickness for the case of PAUT?

 

[EdStainless]

What does the equipment builder say?
What about asking your LVL III?
It isn't can you do it, but can you calibrate and get a good S:N so that you have a useful test.

 

[Andrew ONeill]

Rule of thumb is around 6-8mm as the minimum for any form of ultrasonic crack testing (PAUT is just a fancy version of UT). However, if someone does qualification testing on sample plates, and all the stuff that does with it, that value may be able to be reduced on a case by case basis. I've seen it used successfully on a round 3-4 mm piping. So basically what Edstainless just said above.