Forum Technical Discussions      Re: Selection of IQI/Radition source Posted by: annonym , E-mail: Address, on December 01, 2008 at 17:59 : In Reply to: Re: Selection of IQI/Radition source posted by : Nigel Armstrong , E-mail: Address, on December 01, 2008 at 01:56 : 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/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 ------------ Follow Ups: Post a Followup: Name: E-Mail: Subject: Comments: ----------- Start Original Message ----------- : Selen 75, Wire 13 or 14 should be visible. : : 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/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 ------------ Optional Link URL: Example: "http://www....html". Alternative write "http://www.ndt.net/wshop/attach/filename.htm" if you transfered a filename.htm via FTP Page Title: is important! Optional Image URL: http://www....gif Attention! Please click the button only once. This may take a moment to process Forum Technical Discussions Help