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Technical Discussions
SHANKAR ARUMUGAM
Other, NDE Engineer
India, Joined Oct 2013, 39

SHANKAR ARUMUGAM

Other, NDE Engineer
India,
Joined Oct 2013
39
10:30 Aug-09-2016
Image quality level 2-2T - reg

In RT, standard Image Quality Level 2-2T, first 2 denotes IQI thickness is no more than 2% of the specimen thickness and the 2T denotes the diameter of the required IQI hole is 2xT. In ASME-V; IQI selection table -T276, 2% of the specimen thickness not meets up to hole type IQI 35. For example while taking RT DWDI on tube butt weld of 8 mm thick, Hole type IQI selected is 15 Thou. The actual IQI thick is 0.38mm. But the specimen’s 2% thick is 0.16mm. In radiograph 2T hole is visible. The IQI thickness is more than 2% of the specimen thickness. Then how can we say 2-2T image quality level? Kindly explain.

 
 Reply 
 
Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 832

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
832
21:32 Aug-09-2016
Re: Image quality level 2-2T - reg
In Reply to SHANKAR ARUMUGAM at 10:30 Aug-09-2016 (Opening).

2-2T defines the quality level (or 2% sensitivity level); and for the 2-2T penetrameter, the thickness is "no more" than 2% of specimen thickness

 
 Reply 
 
SHANKAR ARUMUGAM
Other, NDE Engineer
India, Joined Oct 2013, 39

SHANKAR ARUMUGAM

Other, NDE Engineer
India,
Joined Oct 2013
39
05:19 Aug-10-2016
Re: Image quality level 2-2T - reg
In Reply to Anmol Birring at 21:32 Aug-09-2016 .

Dear Mr. Anmol,
To achieve 2-2T quality level in 8 mm thick specimen, which designation plaque hole type IQI to be used?

 
 Reply 
 
N B Rengaraju
NDT Inspector, NDT Level-III/Radiation Safety Officer(RSO)
Marine and Heavy Engineering Company, MALAYSIA., India, Joined Sep 2014, 108

N B Rengaraju

NDT Inspector, NDT Level-III/Radiation Safety Officer(RSO)
Marine and Heavy Engineering Company, MALAYSIA.,
India,
Joined Sep 2014
108
05:47 Aug-10-2016
Re: Image quality level 2-2T - reg
In Reply to SHANKAR ARUMUGAM at 10:30 Aug-09-2016 (Opening).

Wrong perception, my Friend. ASME -V, IQI selection Table - 276 does not state it is prepared to meet 2-2T quality level. If u are working to meet a specific quality level like 2-2T, u have to select IQI whose thickness is not more than 2% of the single wall thickness. U can add allowable reinforcement, if ts welding. Do not refer to Table-276 here.

 
 Reply 
 
N B Rengaraju
NDT Inspector, NDT Level-III/Radiation Safety Officer(RSO)
Marine and Heavy Engineering Company, MALAYSIA., India, Joined Sep 2014, 108

N B Rengaraju

NDT Inspector, NDT Level-III/Radiation Safety Officer(RSO)
Marine and Heavy Engineering Company, MALAYSIA.,
India,
Joined Sep 2014
108
05:55 Aug-10-2016
Re: Image quality level 2-2T - reg
In Reply to SHANKAR ARUMUGAM at 10:30 Aug-09-2016 (Opening).

To acheive 2-2T quality level in 8mm thick specimen, u should use ASTM 5 plaque hole type IQI.

 
 Reply 
 
SHANKAR ARUMUGAM
Other, NDE Engineer
India, Joined Oct 2013, 39

SHANKAR ARUMUGAM

Other, NDE Engineer
India,
Joined Oct 2013
39
06:17 Aug-10-2016
Re: Image quality level 2-2T - reg
In Reply to N B Rengaraju at 05:55 Aug-10-2016 .

This one I need sir. Thank you very much. Is the following statement is right? If I am using 17 Thou IQI for 11mm weld thick (8mm +3 mm reinforcement) and the 2T hole seen in the radiograph, then the Image quality level is 4-2T.

 
 Reply 
 
N B Rengaraju
NDT Inspector, NDT Level-III/Radiation Safety Officer(RSO)
Marine and Heavy Engineering Company, MALAYSIA., India, Joined Sep 2014, 108

N B Rengaraju

NDT Inspector, NDT Level-III/Radiation Safety Officer(RSO)
Marine and Heavy Engineering Company, MALAYSIA.,
India,
Joined Sep 2014
108
06:30 Aug-10-2016
Re: Image quality level 2-2T - reg
In Reply to SHANKAR ARUMUGAM at 06:17 Aug-10-2016 .

Yes. U are correct.

 
 Reply 
 

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