RE: [MW:18692] RT techniques superimpose Vs ellipse

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

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Sonu Shahu
Sent: Wednesday, September 18, 2013 6:35 AM
To: materials-welding@googlegroups.com
Subject: Re: [MW:18685] RT techniques superimpose Vs ellipse

 

ellipse(two exposure) is better.

regards

s.m.shahu

 

On Tue, Sep 17, 2013 at 12:03 AM, mohd <mohd52100@gmail.com> wrote:

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.

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