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- since 1996 -

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Technical Discussions
suman kumar ghosh
NDT Inspector,
doosan power systems india pvt ltd, India, Joined Aug 2014, 7

suman kumar ghosh

NDT Inspector,
doosan power systems india pvt ltd,
India,
Joined Aug 2014
7
15:39 Sep-21-2019
IQI selection For DWDI technique

Dear all,
can any body help me regarding IQI selection for Double wall Double Image technique.
whether IQI will be selected for single wall thickness or double wall thickness.
if we select iqi for single wall it is not showing sufficient sensitivity. can we select it for double wall thickness if yes then please refer the any code standard for it.

 
 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
16:05 Sep-21-2019
Re: IQI selection For DWDI technique
In Reply to suman kumar ghosh at 15:39 Sep-21-2019 (Opening).

Single wall only.
You will just have to optimize the technique/film selection etc..

 
 Reply 
 
SUMAN KUMAR GHOSH
NDT Inspector,
doosan power systems india pvt ltd, India, Joined Aug 2014, 7

SUMAN KUMAR GHOSH

NDT Inspector,
doosan power systems india pvt ltd,
India,
Joined Aug 2014
7
04:19 Sep-22-2019
Re: IQI selection For DWDI technique
In Reply to Anmol Birring at 16:05 Sep-21-2019 .

thanks for your reply,
i know as per section v it is mentioned that it is for single wall only but as we are seeing double wall image and we are penetrating through two walls then why we consider single wall for sensitivity.

 
 Reply 
 
langtuteng2
Armenia, Joined Nov 2014, 199

langtuteng2

Armenia,
Joined Nov 2014
199
05:57 Sep-24-2019
Re: IQI selection For DWDI technique
In Reply to suman kumar ghosh at 15:39 Sep-21-2019 (Opening).

it depends on which criteria you used. according to ASME code, IQI shall be selected based on single wall thickness no matter it is single wall or double wall

 
 Reply 
 
Gnana Sekaran
India, Joined Aug 2019, 1

Gnana Sekaran

India,
Joined Aug 2019
1
09:32 Sep-24-2019
Re: IQI selection For DWDI technique
In Reply to SUMAN KUMAR GHOSH at 04:19 Sep-22-2019 .

IQI selection must be based on single wall thickness plus allowable reinforcement.This is to achieve 2% sensitivity which is industrial requirements. IQI thickness should be 2% of single wall thickness of the material.
If you consider double wall thk. for IQI selection,then you cannot ensure desired sensitivity.i.e,2%(2/2T)

 
 Reply 
 
virendra
NDT Inspector,
India, Joined Sep 2012, 3

virendra

NDT Inspector,
India,
Joined Sep 2012
3
08:32 Sep-25-2019
Re: IQI selection For DWDI technique
In Reply to suman kumar ghosh at 15:39 Sep-21-2019 (Opening).

IQI shall be selected based on single wall thickness plus reinforcement.
diameter of pipe shall be considered to calculate Ug value.
for sensitivity, check with increased sfd and type of film

 
 Reply 
 
Ricardo Andreucci
FATEC - Technological University of Sao Paulo, Brazil, Joined May 2018, 38

Ricardo Andreucci

FATEC - Technological University of Sao Paulo,
Brazil,
Joined May 2018
38
15:15 Sep-30-2019
Re: IQI selection For DWDI technique
In Reply to SUMAN KUMAR GHOSH at 04:19 Sep-22-2019 .

Hi Mr. Suman Kumar Ghosh
The selection shall be per single wall and position of IQI for DWDI shall be source side only, because you are analyzing and inspecting the both sides of weld in the ellipse shaped image. This is the worst RT technique for essential IQI wire or hole observation. For this reason you have to use Film Class 1 and 700 mm SOD.

 
 Reply 
 

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