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Technical Discussions
balwinder singh
balwinder singh
09:55 Nov-30-2008
Selection of IQI/Radition source

dear experts,

we are doing radiographic testing of piping weldments,the dimension of our job as detail given below:-

OD OF PIPE/Single wall thickness

141/6.55 mm
168.3/7.11 mm

class of testing EN 1435 CLASS B

question is:-
what type of source we have to used.

which wire should be vissible on radiograph.(IQI 10 10 FE EN).

also let me know what is penetrated thickness.
thanks



    
 
 Reply 
 
Nigel Armstrong
Engineering, - Specialist services
United Kingdom, Joined Oct 2000, 1096

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1096
01:56 Dec-01-2008
Re: Selection of IQI/Radition source
Balwinder

Contract documentation should specify if there are any limitations further than the moninated Code. So the Owner's specification may say "X-ray only", even though the Codes usually permit either X or gamma within material thickness limitations. Low kV X-ray gives better images in most cases than commercially available gamma sources, though I have read that Selenium can give good results on thinner materials.

Your required visible wire is one that indicates better then 2% sensitivity so its diameter should be less than 6.55mm x 0.02 = 0.131mm or 7.11mm x 0.02 = 0.142mm

Penetrated thickness for Ug unsharpness calculation is the single wall thickness (6.55 or 7.11mm) + single measured weld reinforcement.

Hope this helps

Nigel

----------- Start Original Message -----------
: dear experts,
: we are doing radiographic testing of piping weldments,the dimension of our job as detail given below:-
: OD OF PIPE/Single wall thickness
: 141/6.55 mm
: 168.3/7.11 mm
: class of testing EN 1435 CLASS B
: question is:-
: what type of source we have to used.
: which wire should be vissible on radiograph.(IQI 10 10 FE EN).
: also let me know what is penetrated thickness.
: thanks
------------ End Original Message ------------




    
 
 Reply 
 
annonym
annonym
07:59 Dec-01-2008
Re: Selection of IQI/Radition source
Selen 75, Wire 13 or 14 should be visible.

----------- Start Original Message -----------
: Balwinder
: Contract documentation should specify if there are any limitations further than the moninated Code. So the Owner's specification may say "X-ray only", even though the Codes usually permit either X or gamma within material thickness limitations. Low kV X-ray gives better images in most cases than commercially available gamma sources, though I have read that Selenium can give good results on thinner materials.
: Your required visible wire is one that indicates better then 2% sensitivity so its diameter should be less than 6.55mm x 0.02 = 0.131mm or 7.11mm x 0.02 = 0.142mm
: Penetrated thickness for Ug unsharpness calculation is the single wall thickness (6.55 or 7.11mm) + single measured weld reinforcement.
: Hope this helps
: Nigel
: : dear experts,
: : we are doing radiographic testing of piping weldments,the dimension of our job as detail given below:-
: : OD OF PIPE/Singlewall thickness
: : 141/6.55 mm
: : 168.3/7.11 mm
: : class of testing EN 1435 CLASS B
: : question is:-
: : what type of source we have to used.
: : which wire should be vissible on radiograph.(IQI 10 10 FE EN).
: : also let me know what is penetrated thickness.
: : thanks
------------ End Original Message ------------




    
 
 Reply 
 

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