Technical Discussions: Re: IQI Selection for DWDI

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Re: IQI Selection for DWDI
Posted by: Kaveh Edalati , E-mail: edalatik@yahoo.com.au, on November 09, 2005 at 12:03 :
In Reply to: IQI Selection for DWDI posted by : A.A.Amiri , E-mail: a_a_amiri@yahoo.com, on November 05, 2005 at 14:40 :
----------- 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

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

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