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- since 1996 -
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Technical Discussions
Vignesh
Vignesh
20:26 Jul-07-2016
RT doubt

Sir this is vicky I am have one doubt in RT,
In RT method double wall single image, single wall single, penroma shot, which one is speedest method to take RT in pipe section,

Vignesh

 
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LK
NDT Inspector,
Norway, Joined May 2008, 104

LK

NDT Inspector,
Norway,
Joined May 2008
104
21:16 Jul-07-2016
Re: RT doubt
In Reply to Vignesh at 20:26 Jul-07-2016 (Opening).

For the same source, same pipe dimension and thickness panoramic shot will have the shortest exposure time.

 
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salen5945
,
Algeria, Joined Jul 2016, 2

salen5945

,
Algeria,
Joined Jul 2016
2
07:44 Jul-09-2016
Re: RT doubt
In Reply to Vignesh at 20:26 Jul-07-2016 (Opening).

Your selection of the technique shall based on the size, type, etc. of the subjective.

But for the same subjective, DWDI and DWSI are almost the same exposure time as both used the same F; Panoramic technique will cost long exposure time as F will be lager than above to get the elliptical image.

 
 Reply 
 
LK
NDT Inspector,
Norway, Joined May 2008, 104

LK

NDT Inspector,
Norway,
Joined May 2008
104
12:06 Jul-09-2016
Re: RT doubt
In Reply to salen5945 at 07:44 Jul-09-2016 .

Common sence tells you to compare only alternative technoques, sush as DWSI and SWSI, since you normaly wouldn't take elliptic shots on 8'' or center shots on 2'' for instance. Not sure what you are refering to as F, but if it SFD, than in panoramic shot the distance radiation is traveling to the film is roughly half and penetrated thickness also a half of what you have, exposuring DWSI the same pipe.
Nor quite corrct to compare DWDI and DWSI, since the first one as a rule of thumb is used for diameters up to 100mm (3'') and the later for 4'' and up, therefore SFD and SOD are nor comparable etc etc

 
 Reply 
 
Chris Edwards
Consultant,
United Kingdom, Joined Dec 2012, 43

Chris Edwards

Consultant,
United Kingdom,
Joined Dec 2012
43
19:17 Jul-13-2016
Re: RT doubt
In Reply to Vignesh at 20:26 Jul-07-2016 (Opening).

Panoramic exposure is always quickess but you need access to the iside of the pipe. Exposure tme is greatly reduced as the distance is halved and only 1 shot is required - can put multiple films all around the weld.
May have to do a few exposures with source slighly offset from the weld if you want to look for lack of sidewalll fusion.

Chris

 
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