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- since 1996 -
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Technical Discussions
Rajesh Thamineedi
India, Joined Mar 2017, 3

Rajesh Thamineedi

India,
Joined Mar 2017
3
13:56 Mar-11-2017
Radiography

Dear All,
I am in confused situation that needs your kind Technical help to solve the issue in my work.We had a Radiographed a 4" dia joint one year ago and found accepted Now my client wants to radiograph again But the problem is New radiograph i not matching with old one.What are possibilities are there why its not matching.Everything is correct i am doing but still its not matching with the old one.I need your valuable technical suggestions to come out from this situation.

Thanks

Rajesh

 
 Reply 
 
Hamid Reza
,
Canada, Joined Oct 2016, 68

Hamid Reza

,
Canada,
Joined Oct 2016
68
15:03 Mar-11-2017
Re: Radiography
In Reply to Rajesh Thamineedi at 13:56 Mar-11-2017 (Opening).

Dear Rajesh,

Can you please be more specific?

What do you mean it does not match?

Can you please post the picture of the radiograph here?

Sincerely,
EB

 
 Reply 
 
Rajesh Thamineedi
India, Joined Mar 2017, 3

Rajesh Thamineedi

India,
Joined Mar 2017
3
15:09 Mar-11-2017
Re: Radiography
In Reply to Hamid Reza at 15:03 Mar-11-2017 .

Dea Eager,

Thank you for your reply.

what i mean does not match is that the weld profile in the first radiography is not matching with second time radiograph weld profile.

Sorry at this moment i dont have the pictures to post.

Thanks
Rajesh

 
 Reply 
 
Mark
,
Zambia, Joined Jun 2016, 49

Mark

,
Zambia,
Joined Jun 2016
49
17:03 Mar-11-2017
Re: Radiography
In Reply to Rajesh Thamineedi at 15:09 Mar-11-2017 .

Some times contractors done cut out after radiography testing for some reasons(fit up problem,...) .make sure the weld is not repaired.

 
 Reply 
 
S V Swamy
Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex , India, Joined Feb 2001, 787

S V Swamy

Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex ,
India,
Joined Feb 2001
787
17:12 Mar-11-2017
Re: Radiography
In Reply to Rajesh Thamineedi at 15:09 Mar-11-2017 .

If you were personally involved in radiography of the weld both times, one parameter remained constant.

Are you sure it is the same weld? Sometimes, identification of welds can go wrong. If the weld identification is correct, one needs to look at both the radiographs carefully to understand the problem better....Depending on what differences come up, one needs to search for a technical answer.

Best wishes

Swamy

 
 Reply 
 
N B Rengaraju
NDT Inspector, NDT Level-III/Radiation Safety Officer(RSO)
Marine and Heavy Engineering Company, MALAYSIA., India, Joined Sep 2014, 106

N B Rengaraju

NDT Inspector, NDT Level-III/Radiation Safety Officer(RSO)
Marine and Heavy Engineering Company, MALAYSIA.,
India,
Joined Sep 2014
106
18:03 Mar-11-2017
Re: Radiography
In Reply to Rajesh Thamineedi at 13:56 Mar-11-2017 (Opening).

Following are the possibilities:
1. When RT was done initially, joint was wrongly identified and cleared.
2. If not, then weld was cut & rewelded after clearance of RT.
3. If this is also not true, then current wrong identification of joint is the problem.

The solution has to be within the above.

Regards

1
 
 Reply 
 
S.Senthilkumar
Engineering, QA/QC/NDT
NOV (National Oilwell Varco), Angola, Joined Mar 2006, 42

S.Senthilkumar

Engineering, QA/QC/NDT
NOV (National Oilwell Varco),
Angola,
Joined Mar 2006
42
11:01 Mar-12-2017
Re: Radiography
In Reply to N B Rengaraju at 18:03 Mar-11-2017 .

Is there anyfluid in now or line is inservice?
SSK

 
 Reply 
 
Rajesh Thamineedi
India, Joined Mar 2017, 3

Rajesh Thamineedi

India,
Joined Mar 2017
3
13:10 Mar-12-2017
Re: Radiography
In Reply to S.Senthilkumar at 11:01 Mar-12-2017 .

Thank you for all the replies.

Yes we tried everything but join is still not matching and its not in service at.

 
 Reply 
 
Shane Feder
, Quality Co-ordinator (SubSea)
Thailand, Joined Dec 2014, 89

Shane Feder

, Quality Co-ordinator (SubSea)
Thailand,
Joined Dec 2014
89
02:06 Mar-19-2017
Re: Radiography
In Reply to Rajesh Thamineedi at 13:10 Mar-12-2017 .

Rajesh,
Was the pipe initially radiographed "insitu" (in the same position it is now) ?
If it was and if the pipe is in the horizontal the zero datum should be on top so you should be able to shoot from the same locations.
If it wasn't then your shots from different locations may cause minor differences in profile.
Even having the collimator on opposite sides of the weld could cause minor differences in profile.
Would assist greatly if you could post the graphs.
Cheers,
Shane

 
 Reply 
 
Shane Feder
, Quality Co-ordinator (SubSea)
Thailand, Joined Dec 2014, 89

Shane Feder

, Quality Co-ordinator (SubSea)
Thailand,
Joined Dec 2014
89
02:24 Mar-19-2017
Re: Radiography
In Reply to Shane Feder at 02:06 Mar-19-2017 .

Rajesh,
If your client has requested a weld be radiographed again after 1 year (without going in to service) there is a strong possibility that the client has doubts over the integrity of the testing.
If the weld has been incorrectly numbered it calls in to question the remainder of the welds tested.
Before this possibly turns into a major "can of worms" it may be worth performing additional tests to ensure it is an isolated mistake and not widespread.
Hope that helps,
Cheers,
Shane

 
 Reply 
 

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