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develops and manufactures cutting edge Portable Digital Radiography X-ray Inspection Systems.

711 views
09:55 Nov-30-2008
balwinder singh
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



 
01:56 Dec-01-2008

Nigel Armstrong

Engineering, - Specialist services
United Kingdom,
Joined Oct 2000
1094
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 ------------




 
07:59 Dec-01-2008
annonym
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 ------------




 


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