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Technical Discussions
A.A.Amiri
Consultant, NDT/QC/WELD INSPECTION
Iran, Joined Nov 2005, 20

A.A.Amiri

Consultant, NDT/QC/WELD INSPECTION
Iran,
Joined Nov 2005
20
04:40 Nov-05-2005
IQI Selection for DWDI

Dear Friends,
In DWDI Technique,For IQI Selection both weld cap shall be account or only one?
Regard,



    
 
 Reply 
 
John D.
John D.
03:20 Nov-06-2005
Re: IQI Selection for DWDI
----------- Start Original Message -----------
: Dear Friends,
: In DWDI Technique,For IQI Selection both weld cap shall be account or only one?
: Regard,
------------ End Original Message ------------
Your IQI Selection is based on the nominal single wall thickness of the pipe and the maximum reinforcement permmited by the referencing code section. That is regardless of the technique being used.
That includes the internal root protrusion and cap.
If you are permitted 1.6mm reinfiorcement then you can take credit for 1.6mm for the cap and 1.6mm for the root protrusion for a total of 3.2mm of reinfoecement.




    
 
 Reply 
 
Juan Amado
Engineering, Inspection
Arco Industrial, S.A., Panama, Joined Nov 2001, 44

Juan Amado

Engineering, Inspection
Arco Industrial, S.A.,
Panama,
Joined Nov 2001
44
05:04 Nov-07-2005
Re: IQI Selection for DWDI
----------- Start Original Message -----------
: : Dear Friends,
: : In DWDI Technique,For IQI Selection both weld cap shall be account or only one?
: : Regard,
: Your IQI Selection is based on the nominal single wall thickness of the pipe and the maximum reinforcement permmited by the referencing code section. That is regardless of the technique being used.
: That includes the internal root protrusion and cap.
: If you are permitted 1.6mm reinfiorcement then you can take credit for 1.6mm for the cap and 1.6mm for the root protrusion for a total of 3.2mm of reinfoecement.
------------ End Original Message ------------

When selecting the IQI whether for a single or double exposure type shot the following concept should be kept in mind:
The IQI is the "gage" that allows us to determine the resolution of an image of our area of interest as required by a given standard. In the case of a double exposure shot on a pipe, even though we are looking at the image of the welds from the nearand far side of the pipe on the radiograph at the same time, the area of interest that we are trying to evaluate is still just one weld bead at a time. In other words we would like to know if defects that would be detrimental to a certain size of weld can be discerned on the image, therefore all of our IQI comparisons are based on just one weld bead (one thickness plus the allowed reinforcement).

Hope this helps,
Juan Amado




    
 
 Reply 
 
bighorn30
bighorn30
07:54 Nov-08-2005
Re: IQI Selection for DWDI
----------- Start Original Message -----------
: : : Dear Friends,
: : : In DWDI Technique,For IQI Selection both weld cap shall be account or only one?
: : : Regard,
: : Your IQI Selection is based on the nominal single wall thickness of the pipe and the maximum reinforcement permmited by the referencing code section. That is regardless of the technique being used.
: : That includes the internal root protrusion and cap.
: : If you are permitted 1.6mm reinfiorcement then you can take credit for 1.6mm for the cap and 1.6mm for the root protrusion for a total of 3.2mm of reinfoecement.
: When selecting the IQI whether for a single or double exposure type shot the following concept should be kept in mind:
: The IQI is the "gage" that allows us to determine the resolution of an image of our area of interest as required by a given standard. In the case of a double exposure shot on a pipe, even though we are looking at the image of the welds from the near and far side of the pipe on the radiograph at the same time, the area of interest that we are trying to evaluate is still just one weld bead at a time. In other words we would like to know if defects that would be detrimental to a certain size of weld can be discerned on the image, therefore all of our IQI comparisons are based on just one weld bead (one thickness plus the allowed reinforcement).
: Hope this helps,
: Juan Amado
------------ End Original Message ------------

The wire type penetrameter or Image Quality Indicator does not give any quantitive value of "radiographic resolution" what it does do is enable the technician to calculate the "sensitivity" i.e the ability to detect small defects. Resolution and sensitivity are two seperate things and should not be confused.
In DWDI (usually employed in dia upto 90mm) the IQI should be placed accross or close to the weld on the "source side" and in selecting IQI size, use single wall thickness + cap + root. Hope this helps.



    
 
 Reply 
 
bighorn30
bighorn30
08:36 Nov-08-2005
Re: IQI Selection for DWDI
----------- Start Original Message -----------
: : : : Dear Friends,
: : : : In DWDI Technique,For IQI Selection both weld cap shall be account or only one?
: : : : Regard,
: : : Your IQI Selection is based on the nominal single wall thickness of the pipe and the maximum reinforcement permmited by the referencing code section. That is regardless of the technique being used.
: : : That includes the internal root protrusion and cap.
: : : If you are permitted 1.6mm reinfiorcement then you can take credit for 1.6mm for the cap and 1.6mm for the root protrusion for a total of 3.2mm of reinfoecement.
: : When selecting the IQI whether for a single or double exposure type shot the following concept should be kept in mind:
: : The IQI is the "gage" that allows us to determine the resolution of an image of our area of interest as required by a given standard. In the case of a double exposure shot on a pipe, even though we are looking at the image of the welds from the near and far side of the pipe on the radiograph at the same time, the area of interest that we are trying to evaluate is still just one weld bead at a time. In other words we would like to know if defects that would be detrimental to a certain size of weld can be discerned on the image, therefore all of our IQI comparisons are based on just one weld bead (one thickness plus the allowed reinforcement).
: : Hope this helps,
: : Juan Amado
: The wire type penetrameter or Image Quality Indicator does not give any quantitive value of "radiographic resolution" what it does do is enable the technician to calculate the "sensitivity" i.e the ability to detect small defects. Resolution and sensitivity are two seperate things and should not be confused.
: In DWDI (usually employed in dia upto 90mm) the IQI should be placed accross or close to the weld on the "source side" and in selecting IQI size, use single wall thickness + cap + root. Hope this helps.
------------ End Original Message ------------

Sorry - should read dia upto 89mm.


    
 
 Reply 
 
Kaveh Edalati
Kaveh Edalati
02:03 Nov-09-2005
Re: IQI Selection for DWDI
----------- Start Original Message -----------
: Dear Friends,
: In DWDI Technique,For IQI Selection both weld cap shall be account or only one?
: Regard,
------------ End Original Message ------------

There are some discrepancies in code and standards on IQI selection in double wall radiography of pipes. In BS EN 462 (1994) and BS EN 1435 (1997), IQI selection for double wall exposure of pipes is always based on the double wall thickness. In ASME BPV section VII (2004) IQI selection for DWDI and DWSI radiography of pipes is always based on the single wall thickness and in BS 5500 (1997), AS 2177 (1982), API 1104 (2001), ISO 19232-1 (2004), CODAP (code of France) and IPC (standard of Iran), IQI selection is based on the weld thickness. Works realized by me show that the IQI should be selected based on the double wall thickness in DWDI and based on the single wall thickness in DWSI. This was in good agreement with some codes and standards such as ASTM E 747 (1990), ASTM E 1742 (1995), JIS Z 2306 (2000) and AD-Merkblatt (Code of Italia).
Regards
Kaveh


    
 
 Reply 
 
Kaveh Edalati
Kaveh Edalati
08:26 Nov-11-2005
Re: IQI Selection for DWDI
----------- Start Original Message -----------
: : : : : Dear Friends,
: : : : : In DWDI Technique,For IQI Selection both weld cap shall be account or only one?
: : : : : Regard,
: : : : Your IQI Selection is based on the nominal single wall thickness of the pipe and the maximum reinforcement permmited by the referencing code section. That is regardless of the technique being used.
: : : : That includes the internal root protrusion and cap.
: : : : If you are permitted 1.6mm reinfiorcement then you can take credit for 1.6mm for the cap and 1.6mm for the root protrusion for a total of 3.2mm of reinfoecement.
: : : When selecting the IQI whether for a single or double exposure type shot the following concept should be kept in mind:
: : : The IQI is the "gage" that allows us to determine the resolution of an image of our area of interest as required by a given standard. In the case of a double exposure shot on a pipe, even though we are looking at the image of the welds from the near and far side of the pipe on the radiograph at the same time, the area of interest that we are trying to evaluate is still just one weld bead at a time. In other words we would like to know if defects that would be detrimental to a certain size of weld can be discerned on the image, therefore all of our IQI comparisons are based on just one weld bead (one thickness plus the allowed reinforcement).
: : : Hope this helps,
: : : Juan Amado
: : The wire type penetrameter or Image Quality Indicator does not give any quantitive value of "radiographic resolution" what it does do is enable the technician to calculate the "sensitivity" i.e the ability to detect small defects. Resolution and sensitivity are two seperate things and should not be confused.
: : In DWDI (usually employed in dia upto 90mm) the IQI should be placed accross or close to the weld on the "source side" and in selecting IQI size, use single wall thickness + cap + root. Hope this helps.
: Sorry - should read dia upto 89mm.
------------ End Original Message ------------

There are some discrepancies in code and standards on IQI selection in double wall radiography of pipes. In BS EN 462 (1994) and BS EN 1435 (1997), IQI selection for double wall exposure of pipes is always based on the double wall thickness. In ASME BPV section VII (2004) IQI selection for DWDI and DWSI radiography of pipes is always based on the single wall thickness and in BS 5500 (1997), AS 2177 (1982), API 1104 (2001), ISO 19232-1 (2004), CODAP (code of France) and IPC (standard of Iran), IQI selection is based on the weld thickness. Works realized by me show that the IQI should be selected based on the double wall thickness in DWDI and based on the single wall thickness in DWSI. This was in good agreement with some codes and standards such as ASTM E 747 (1990), ASTM E 1742 (1995), JIS Z 2306 (2000) and AD-Merkblatt (Code of Italia).
Regards
Kaveh



    
 
 Reply 
 
Justin Thiraviam
Justin Thiraviam
00:01 Apr-14-2007
IQI Selection for DWDI
Dear friends,

Selection of IQI's are varied from materials to materials like group no 1 given based on light and heavy metals.
But how do we select the particular IQI for a given thickness of materials.
For example, 7.11 mm, which type of wire type IQI should be selected? Why?

I need a justification and explanation for this context.

Regards

R.Justin thiraviam
selected based on t

--------- Start Original Message -----------
: : : : : : Dear Friends,
: : : : : : In DWDI Technique,For IQI Selection both weld cap shall be account or only one?
: : : : : : Regard,
: : : : : Your IQI Selection is based on the nominal single wall thickness of the pipe and the maximum reinforcement permmited by the referencing code section. That is regardless of the technique being used.
: : : : : That includes the internal root protrusion and cap.
: : : : : If you are permitted 1.6mm reinfiorcement then you can take credit for 1.6mm for the cap and 1.6mm for the root protrusionfor a total of 3.2mm of reinfoecement.
: : : : When selecting the IQI whether for a single or double exposure type shot the following concept should be kept in mind:
: : : : The IQI is the "gage" that allows us to determine the resolution of an image of our area of interest as required by a given standard. In the case of a double exposure shot on a pipe, even though we are looking at the image of the welds from the near and far side of the pipe on the radiograph at the same time, the area of interest that we are trying to evaluate is still just one weld bead at a time. In other words we would like to know if defects that would be detrimental to a certain size of weld can be discerned on the image, therefore all of our IQI comparisons are based on just one weld bead (one thickness plus the allowed reinforcement).
: : : : Hope this helps,
: : : : Juan Amado
: : : The wire type penetrameter or Image Quality Indicator does not give any quantitive value of "radiographic resolution" what it does do is enable the technician to calculate the "sensitivity" i.e the ability to detect small defects. Resolution and sensitivity are two seperate things and should not be confused.
: : : In DWDI (usually employed in dia upto 90mm) the IQI should be placed accross or close to the weld on the "source side" and in selecting IQI size, use single wall thickness + cap + root. Hope this helps.
: : Sorry - should read dia upto 89mm.
: There are some discrepancies in code and standards on IQI selection in double wall radiography of pipes. In BS EN 462 (1994) and BS EN 1435 (1997), IQI selection for double wall exposure of pipes is always based on the double wall thickness. In ASME BPV section VII (2004) IQI selection for DWDI and DWSI radiography of pipes is always based on the single wall thickness and in BS 5500 (1997), AS 2177 (1982), API 1104 (2001), ISO 19232-1 (2004), CODAP (code of France) and IPC (standard of Iran), IQI selection is based on the weld thickness. Works realized by me show that the IQI should be selected based on the double wall thickness in DWDI and based on the single wall thickness in DWSI. This was in good agreement with some codes and standards such as ASTM E 747 (1990), ASTM E 1742 (1995), JIS Z 2306 (2000) and AD-Merkblatt (Code of Italia).
: Regards
: Kaveh
------------ End Original Message ------------




    
 
 Reply 
 
rafza
rafza
03:29 Sep-13-2015
Re: IQI Selection for DWDI
In Reply to A.A.Amiri at 04:40 Nov-05-2005 (Opening).

Dear friend

In DWDI Technique,For pipe reducer both are different in diameter ,so how to calculate the sensitivity and IQI selection?

Regards

    
 
 Reply 
 
Sys
NDT Inspector, Shared Resources Manager (HT, Chemical Processing
Collins Aerospace System, Indonesia, Joined Sep 2015, 7

Sys

NDT Inspector, Shared Resources Manager (HT, Chemical Processing
Collins Aerospace System,
Indonesia,
Joined Sep 2015
7
21:25 Sep-16-2015
Re: IQI Selection for DWDI
In Reply to A.A.Amiri at 04:40 Nov-05-2005 (Opening).

Hi,

For IQI selection shall be use 1T of pipe, to define exposure time shall be 2T of pipe
how to account sensitivity you can use formula (ASME Art.2 APPENDIX-X1)

α=100/X √ T/2

where:
α=equivalent IQI sensitivity (%)
X= section thickness to be examined (inch)
T=IQI thickness (inch)

Tq,
Sys

    
 
 Reply 
 
Sys
NDT Inspector, Shared Resources Manager (HT, Chemical Processing
Collins Aerospace System, Indonesia, Joined Sep 2015, 7

Sys

NDT Inspector, Shared Resources Manager (HT, Chemical Processing
Collins Aerospace System,
Indonesia,
Joined Sep 2015
7
21:30 Sep-16-2015
Re: IQI Selection for DWDI
In Reply to rafza at 03:29 Sep-13-2015 .

@ Mr. Rafza,

Do not worried, in ASME Art. 2 Table T-276 IQI selection can solved your issue,
they have a range of thickness

Tq,
Sys

    
 
 Reply 
 
RANJAN THAKUR
ENGINEERING INSPECTION LOGISTICS, India, Joined Jun 2018, 1

RANJAN THAKUR

ENGINEERING INSPECTION LOGISTICS,
India,
Joined Jun 2018
1
14:33 Jun-18-2018
Re: IQI Selection for DWDI
In Reply to Justin Thiraviam at 00:01 Apr-14-2007 .

Download IQI SELECTION FOR DWDI

IQI SELECTION FOR DWDI
    
 
 Reply 
 

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