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Technical Discussions
Ashwani Kumar
MIDHANI, Hyderabad, India, Joined Jun 2015, 96

Ashwani Kumar

MIDHANI, Hyderabad,
Joined Jun 2015
14:41 Sep-17-2019
RT vs UT

Dear friends,
We are assessing low alloy high wall thickness steel castings with RT.
The acceptance norms are level III as per ASTM E 186.
At many places due to higher wall thickness SFD are not maintained as standard RT procedure.
The alloy are showing good UT responce.
May I carry out UT with rejection norms as 20% of FSH at the places where proper SFD is not maintained. This is going to be in addition to the RT.
Ashwani Kumar

Michel Couture
NDT Inspector,
consultant, Canada, Joined Sep 2006, 897

Michel Couture

NDT Inspector,
Joined Sep 2006
02:52 Sep-19-2019
Re: RT vs UT
In Reply to Ashwani Kumar at 14:41 Sep-17-2019 (Opening).

As you stated, your inspection is carried out with accepting norm ASTM E186 Level 3. I believe, the norm calls for RT inspection. Therefore you have to follow ASTM E186. Only if the client approuve UT has a method of inspection can you do UT.

If you can't maintain SFD as per procedure, I suggest that you do multiple shots according to wall thickness. You should be able to succeed.


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