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Re: Thickness IQI Based on
Posted by: S.V.Swamy (PID_839), E-mail: svsndt@rediffmail.com, on December 23, 2003 at 15:12 :
In Reply to: Re: Thickness IQI Based on posted by : N. Kuppusamy , E-mail: nksamy42@singnet.com.sg, on December 22, 2003 at 03:01 :
Dear Sri Kuppuswamy garu,
Thank you for explaining the proviso of Article 276. Though on first reading, it looked to me to be wrong, on further analysis it looks to be correct. I give below my reasoning for thinking it is correct. Pl. tell me whether I am correct.
The elliptical technique involves a slightly inclined exposure of the pipe weld so that the upper half of the pipe is imaged adjacent to but away from the lower half. The circle of the pipe cross-section is converted to an ellipse.
So, as far as the exposure for getting correct density in the film is concerned, the thickness to be taken into account is two times the wall thickness and two times the weld reinforcement (OD and ID side reinforcements if applicable, otherwise one reinforcement on the OD side as aplicable).
But as far as the selection of the IQI is concerned, the image being evaluated represents a single wall, plus the reinforcement in the weld. If ID side reinforcement is not there, OD side only is to be added. Thus one wall plus one reinforcement is appropriate, to demonstrate the sensitivity of the technique.
This was a tough case and I am happy that you posted the actual article.
Thanks and regards.
Swamy
----------- Start Original Message -----------
: Hi,
: According to ASME Section-V Article -2 Para T276.2, Table T276 and Article-2 Nonmandatory Appendix-A (Technique sketches for pipe or tube welds, Page 50 ASME Sec.V 2001 Edition), the penetrameter thickness shall be based on nominal single wall thickness (T276.2a) + single reinforcement (if applicable, T276.2b) for elliptical technique.
: In your case the wall thickness is 8.71 mm and weld reinforcement is 1.6mm. In accordance with ASME-V article-2 T-276b, the thickness for penetrameter selection shall be based on 10.31mm (i.e., 8.71+1.6). Therefore according to Table T-276 & Table T-33.2, the IQI shall be ASTM 1B.
: N.Kuppusamy
------------ End Original Message ------------

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----------- Start Original Message ----------- : Dear Sri Kuppuswamy garu, : Thank you for explaining the proviso of Article 276. Though on first reading, it looked to me to be wrong, on further analysis it looks to be correct. I give below my reasoning for thinking it is correct. Pl. tell me whether I am correct. : The elliptical technique involves a slightly inclined exposure of the pipe weld so that the upper half of the pipe is imaged adjacent to but away from the lower half. The circle of the pipe cross-section is converted to an ellipse. : So, as far as the exposure for getting correct density in the film is concerned, the thickness to be taken into account is two times the wall thickness and two times the weld reinforcement (OD and ID side reinforcements if applicable, otherwise one reinforcement on the OD side as aplicable). : But as far as the selection of the IQI is concerned, the image being evaluated represents a single wall, plus the reinforcement in the weld. If ID side reinforcement is not there, OD side only is to be added. Thus one wall plus one reinforcement is appropriate, to demonstrate the sensitivity of the technique. : This was a tough case and I am happy that you posted the actual article. : Thanks and regards. : Swamy : : Hi, : : According to ASME Section-V Article -2 Para T276.2, Table T276 and Article-2 Nonmandatory Appendix-A (Technique sketches for pipe or tube welds, Page 50 ASME Sec.V 2001 Edition), the penetrameter thickness shall be based on nominal single wall thickness (T276.2a) + single reinforcement (if applicable, T276.2b) for elliptical technique. : : In your case the wall thickness is 8.71 mm and weld reinforcement is 1.6mm. In accordance with ASME-V article-2 T-276b, the thickness for penetrameter selection shall be based on 10.31mm (i.e., 8.71+1.6). Therefore according to Table T-276 & Table T-33.2, the IQI shall be ASTM 1B. : : N.Kuppusamy ------------ End Original Message ------------

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