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Zawada NDT
Suppliers of instruments to test steel wire ropes in-situ, using magnetic, non-destructive method.

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Technical Discussions
Christine Olive
Christine Olive
01:16 Jan-29-2001
Re: Radiography of Tubes with Source on Tubes



    
 
 
Alan Beveridge
Alan Beveridge
04:43 Dec-13-2000
Radiography of Tubes with Source on Tubes

Does anyone have any information on a radiographic technique in which the source is placed onto the tube surface. Types of tubes are 2" OD, I believe the technique uses an Iridium source with a strength of 5 curies or less.

Any info on sensitivity, or who uses such a technique?

Regards,

Alan Beveridge


    
 
 
Dent McIntyre
Consultant, NDE Manager NDELevel III/3
NDT Consultant, Canada, Joined Nov 1998, 248

Dent McIntyre

Consultant, NDE Manager NDELevel III/3
NDT Consultant,
Canada,
Joined Nov 1998
248
03:39 Dec-13-2000
Re: Radiography of Tubes with Source on Tubes
Alan:
Some years ago we used this technique on a nuclear piping job. The tiny Ir 192 source was so small we could actually perform panoramic shots and still meet Ug requirements. 2-2T was no problem.
How thick is the wall of these tubes?

Dent McIntyre
NDE Manager
B & W Canada

: Does anyone have any information on a radiographic technique in which the source is placed onto the tube surface. Types of tubes are 2" OD, I believe the technique uses an Iridium source with a strength of 5 curies or less.

: Any info on sensitivity, or who uses such a technique?

: Regards,

: Alan Beveridge




    
 
 
Robert A. Day
Engineering
Milky Way Jewels, USA, Joined Nov 1998, 40

Robert A. Day

Engineering
Milky Way Jewels,
USA,
Joined Nov 1998
40
01:49 Dec-13-2000
Re: Radiography of Tubes with Source on Tubes



    
 
 
Alan Beveridge
Alan Beveridge
06:53 Dec-14-2000
Re: Thickness ofTubes for Dent McIntyre
: Dent,

Tube thicknesses vary from 3.4mm in reheater to 9.5mm in the final stage superheater.

Our local NDT companies have source sizes of 2mmx2mm, and 3mmx3mm Iridium.

Regards,

Alan Beveridge





    
 
 
Dent McIntyre
Consultant, NDE Manager NDELevel III/3
NDT Consultant, Canada, Joined Nov 1998, 248

Dent McIntyre

Consultant, NDE Manager NDELevel III/3
NDT Consultant,
Canada,
Joined Nov 1998
248
04:49 Dec-14-2000
Re: Thickness ofTubes for Dent McIntyre



    
 
 
Alan Beveridge
Alan Beveridge
05:25 Dec-15-2000
Re: Radiography of Tubes with Source on Tubes
: Dent,

Tube thickness varies from 3.4mm in our reheater to 9.5mm in the final stage superheater.

Regards,

Alan Beveridge

Alan:
: Some years ago we used this technique on a nuclear piping job. The tiny Ir 192 source was so small we could actually perform panoramic shots and still meet Ug requirements. 2-2T was no problem.
: How thick is the wall of these tubes?

: Dent McIntyre
: NDE Manager
: B & W Canada




    
 
 
BobC
BobC
03:52 Dec-20-2000
Re: Radiography of Tubes with Source on Tubes
I regards to your question, you must first determine to which code, or to what specification you are to be in compliance with. ASME generaly requires anything below 3.5" od to be radiographed using a superimposed or eliptical technique. On the other end of the spectrum Gas piping code has essentially the same requirement. Most codes make provision for the engineer to approve alternate techniques, but in general you are going to want the smallest physical source that you can get. Hope some of this helps.



    
 
 
Farshad Mobasher-Fard
Engineering
Nikan Machine, Iran, Joined Sep 2001, 3

Farshad Mobasher-Fard

Engineering
Nikan Machine,
Iran,
Joined Sep 2001
3
07:54 Sep-18-2001
Re: Radiography of Tubes with Source on Tubes
Re: Radiography of Tubes with Source on Tubes


    
 
 

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