RT techniques superimpose Vs ellipse

[mohd]

dear sir,
for pipe dia less than 88.9 we r using RT technique superimpose(three exposure) and ellipse(two exposure).

which one is better?. or both are same in context of defect evaluation.

regards,
mohd.

[Sonu Shahu]

ellipse(two exposure) is better.

regards

s.m.shahu

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kunal

[george....@gr.bureauveritas.com]

both are acceptable by the Code.
I, personally, prefer the ellipse (exposure arrangement F in Article 2 - Section V)

best regards

Dr. Georgios Dilintas

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mohd ---17/09/2013 08:59:56---dear sir, for pipe dia less than 88.9 we r using RT technique superimpose(three exposure) and ellips

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[M Vedaraju]

Dear Friend,

 

1.       Ellipse technique is better for 10  mm thick and less. When thickness of the pipe is more than 10 mm, it requires more source offset to form the ellipse so as to get the both film side & source side welds separated. Hence, it is advisable to use superimposed technique, if thickness is more than 10 mm.

 

2.       When pipe / diameter is one inch and less, it is again requires more source setting time to form the ellipse and get the both welds separated. Hence when the diameter is 1-inch and less, it is better to perform radiography with superimposed technique.

 

Thanks,

With kind regards,

M. Vedaraju

[SENTHILKUMAR SWAMINATHAN]

Hi Shahu,

 

Follow as per mr Vedaraju. What is your wall thickness by the by? when the wall thickness goes high you can perform DWSI as well code permits. To meet your UG value follow mandatory / non mandatory in Art 2, Sec V, ASME.

 

Regards,
S.SENTHILKUMAR

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kunal

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