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Technical Discussions
bounatiro
Algeria, Joined Aug 2019, 7

bounatiro

Algeria,
Joined Aug 2019
7
19:22 Aug-22-2019
radiography piping fill with water

dear expert
Our, company is contacted to do radiography for the welding joint of thin joint of piping diameter from 2 to 20", but the problem is almost the piping is filled with water, I searched any standard for doing radiography but unfortunately I didn't find any way,
please share your experience

 
 Reply 
 
laurie
Australia, Joined Feb 2019, 41

laurie

Australia,
Joined Feb 2019
41
02:56 Aug-23-2019
Re: radiography piping fill with water
In Reply to bounatiro at 19:22 Aug-22-2019 (Opening).

There aren't any standards that I know of for this situation but you can radiograph the joint.
Work out the equivalent thickness of steel for your water path, and then work out your achievable sensitivity and see if it meets code requirements.
HVL for water with IR192 is something like 70mm.
So your 2" with water would be equivalent to about an extra 10 mm of steel and the 20" about an extra 100 mm of steel.
Sensitivity might be ok for the 2" but 20" is no chance.
You would need to do test exposures to confirm sensitivity and you'd probably need 8 exposures to narrow your diagnostic length to improve the sensitivity for that region.

 
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Shane Feder
, Quality Co-ordinator (SubSea)
Thailand, Joined Dec 2014, 91

Shane Feder

, Quality Co-ordinator (SubSea)
Thailand,
Joined Dec 2014
91
15:02 Aug-27-2019
Re: radiography piping fill with water
In Reply to laurie at 02:56 Aug-23-2019 .

Laurie has given you good advise.
It is very, very hard to get a code compliant radiograph with the pipe filled with water.
If you can meet sensitivity and density requirements then you can interpret but you will need test shots on all diameters and thicknesses first.

 
 Reply 
 
Angel
Angel
19:44 Sep-01-2019
Re: radiography piping fill with water
In Reply to laurie at 02:56 Aug-23-2019 .

2" pipe diameter- equivalent 10mm?
I made pipe with and without water with 4mm thickness and diameter 30mm - the same set up - density and sensitivity were similar, sensitivity hard to note

 
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bounatiro hatem
Algeria, Joined Aug 2019, 7

bounatiro hatem

Algeria,
Joined Aug 2019
7
20:08 Sep-02-2019
Re: radiography piping fill with water
In Reply to Angel at 19:44 Sep-01-2019 .

Dear Expert

Thanks for all answer, us you said, i agree with my client to do some sample according to the idea of laurie, when i will do it i will share with you my radiogramme


Many thanks

 
 Reply 
 

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